Beijing, China
Beijing, China

Tsinghua University is a research university located in Beijing, People's Republic of China , and is one of the nine members in the C9 League. The institution was originally established in 1911 under the name "Tsinghua College" and had been renamed several times since then: from "Tsinghua School" which was used one year after its establishment, to "National Tsinghua University" which was adopted three years after the foundation of its university section in 1925. With its motto of Self-Discipline and Social Commitment, Tsinghua University describes itself as being dedicated to academic excellence, the well-being of Chinese society and to global development. It has consistently received top rankings in both domestic and international university rankings, alongside Peking University, which is the top elite higher learning institution in the mainland People's Republic of China .Tsinghua University in the People's Republic of China is a separate institution from the Taiwanese National Tsing Hua University located in Hsinchu city in the high-tech democratic industrialized developed country of the Republic of China . After the Chinese Civil War and the subsequent split of China into the two present-day separate sovereign independent countries of the Republic of China and the People's Republic of China , some academics and staff from the original Tsinghua University in the mainland People's Republic of China left and created the National Tsing Hua Institute of Nuclear Technology in 1955 in Hsinchu, Republic of China , which later became the National Tsing Hua University of island nation of Taiwan.The two Tsinghua universities are not affiliated with each other, but both claim to be successors of the original Tsinghua University. As a result of this dispute, the universities claimed to be the rightful recipient of the funds from the Boxer Rebellion indemnity that was used to start Tsinghua University. This indemnity was transferred to the university in Taiwan after the democratic Republic of China retreated to the island of Taiwan following the invasions and take over of mainland China by the communist People's Republic of China . Wikipedia.

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The application relates to an combined heating power and cooling apparatus with energy storage for an active distribution network and its operating method. The apparatus is comprised of a generation apparatus, a generator, a waste heat recovering and absorbing heat pump, a high temperature flue gas-water heat exchanger, a medium temperature flue gas-water heat exchanger, a low temperature flue gas-water heat exchanger, a energy storing electric heat pump, a high temperature energy storing canister, a low temperature energy storing canister, a cooling tower a number of circulating water pumps and a number of valves. The operating method changes the traditional operation modes of the system determining electricity based on heat and determining electricity based on cooling, causes the system to regulate power of the generated electricity on grid, participate in the regulation of grid load, solve the problem of a limited ability of generation peak regulation due to the inter-coupling of power generation, heat supply and cooling supply.

Claims which contain your search:

1. A combined heating power and cooling apparatus with energy storage type adapted for an active distribution network, wherein the apparatus comprises a generation apparatus, a generator, an energy storing electric heat pump, a waste heat recovering and absorbing heat pump, a high temperature flue gas-water heat exchanger, a medium temperature flue gas-water heat exchanger, a low temperature flue gas-water heat exchanger, a high temperature energy storing canister, a low temperature energy storing canister, a cooling tower, a number of circulating water pumps, and a number of valves, wherein the generation apparatus is connected to the generator to power the generator, and the generator is connected to the energy storing electric heat pump for driving it to operate; and wherein: a flue gas outlet of the generation apparatus is connected to a generator flue gas inlet of the waste heat recovering and absorbing heat pump, a generator flue gas outlet of the waste heat recovering and absorbing heat pump is connected to a flue gas inlet of the high temperature flue gas-water heat exchanger, a flue gas outlet of the high temperature flue gas-water heat exchanger is connected to a flue gas inlet of the medium temperature flue gas-water heat exchanger, a flue gas outlet of the medium temperature flue gas-water heat exchanger is connected to a flue gas inlet of the low temperature flue gas-water heat exchanger, and a flue gas outlet of the low temperature flue gas-water heat exchanger is connected to external environment; a water side outlet of a first evaporator of the energy storing electric heat pump is connected to a water side inlet of the low temperature flue gas-water heat exchanger sequentially through a first circulating water pump and a first valve, a water side outlet of the low temperature flue gas-water heat exchanger is connected to a water side inlet of the first evaporator of the energy storing electric heat pump through a second valve; a water side inlet of a condenser of the energy storing electric heat pump is connected to a water side outlet of the high temperature energy storing canister sequentially through a third valve and a second circulating water pump, and a water side outlet of the condenser of the energy storing electric heat pump is connected to a water side inlet of the high temperature energy storing canister through a fourth valve; a water side inlet of a second evaporator of the energy storing electric heat pump is connected to a water side outlet of the low temperature energy storing canister through a fifth valve, and a water side outlet of the second evaporator of the energy storing electric heat pump is connected to a water side inlet of the low temperature energy storing canister through a third circulating water pump and a sixth valve; a condenser and absorber side inlet of the waste heat recovering and absorbing heat pump is connected to three inlet branches in parallel, wherein a first inlet branch is connected to a backwater port of heat supply, a second inlet branch is connected to a water outlet of the cooling tower through a seventh valve, a third inlet branch is connected to a water supply port of cooling supply, and the third inlet branch is further connected to four branched inlet branches in parallel, wherein a first branched inlet branch is connected to a water side inlet of the high temperature flue gas-water heat exchanger through an eighth valve, a second branched inlet branch is connected to the water side inlet of the high temperature energy storing canister sequentially through a ninth valve, a fourth circulating water pump and a tenth valve, a third branched inlet branch is connected to the water side inlet of the low temperature energy storing canister through an eleventh valve, and a fourth branched inlet branch is connected to an outlet of the second valve through a twelfth valve; a condenser and absorber side outlet of the waste heat recovering and absorbing heat pump is connected to three outlet branches in parallel, wherein a first outlet branch is connected to an inlet of the cooling tower through a thirteenth valve, a second outlet branch is connected to a water supply port of heat supply, and a third outlet branch is connected to three branched outlet branches in parallel through a fourteenth valve, wherein a first branched outlet branch is connected to a water side outlet of the high temperature flue gas-water heat exchanger through a fifteenth valve, a second branched outlet branch is connected to an inlet of the fourth circulating water pump, a third branched outlet branch is connected to an inlet of the eleventh valve, and an inlet of the fourteenth valve is further connected to the water side outlet of the high temperature energy storing canister through a sixteenth valve; the water side outlet of the high temperature flue gas-water heat exchanger and a water side outlet of the medium temperature flue gas-water heat exchanger are connected to a water side inlet of the evaporator of the waste heat recovering and absorbing heat pump sequentially through a seventeenth valve and a fifth circulating water pump; an inlet of the fifth circulating water pump is further respectively connected to three branched branches through an eighteenth valve, wherein a first branched branch is connected to a backwater port of cooling supply, a second branched branch is connected to an outlet of the first circulating water pump through a nineteenth valve, and a third branched branch is connected to an outlet of the low temperature energy storing canister sequentially through a twentieth valve and a sixth circulating water pump; and a water side outlet of the evaporator of the waste heat recovering and absorbing heat pump is connected to inlets of a twenty-first valve and a twenty-second valve in parallel, an outlet of the twenty-first valve is connected to a water supply port of the cooling supply, an outlet of the twenty-second valve is connected to the water side inlet of the high temperature flue gas-water heat exchanger, a water side inlet of the medium temperature flue gas-water heat exchanger and a backwater port for domestic hot water in parallel, and the twenty-second valve is connected to a seventh circulating water pump in series before the backwater port for domestic hot water; an outlet of the seventh circulating water pump is further connected to the water side inlet of the low temperature flue gas-water heat exchanger, a water supply port for domestic hot water is connected to the water side outlets of the high temperature flue gas-water heat exchanger, the medium temperature flue gas-water heat exchanger, and the low temperature flue gas-water heat exchanger, respectively.

2. The combined heating power and cooling apparatus with energy storage type adapted for an active distribution network of claim 1, wherein the generation apparatus uses one of a micro gas turbine, a gas internal combustion engine, and a gas turbine.

3. The combined heating power and cooling apparatus with energy storage type adapted for an active distribution network of claim 2, wherein each of the high temperature flue gas-water heat exchanger, the medium temperature flue gas-water heat exchanger, and the low temperature flue gas-water heat exchanger employs a wall partitioning heat exchanger or a direct contact heat exchanger, wherein the direct contact heat exchanger utilizes an empty tower heat exchanger, a tower plate heat exchanger, or a filler heat exchanger.

4. An operating method of the combined heating power and cooling apparatus with energy storage type of claim 3, comprising the following contents: the apparatus operates during electrical load valleys, means and peaks in winter and summer through different combinations of valve opening and closing: 1) the combined heating power and cooling apparatus with energy storage type operates during electrical load valleys, means, and peaks in winter through different combinations of valve opening and closing, the particular operation process is:a) when the apparatus is operated during electrical load valleys in winter, that is, when the active distribution network needs to be operated in a lowered electrical load, opening the eighth valve, the fifteenth valve, the seventeenth valve, the twenty-second valve, and the fifth circulating pump; closing each of the ninth valve, the eighteenth valve, the twenty-first valve, the twelfth valve, the nineteenth valve, the seventh valve, and the thirteenth valve; closing the tenth valve, the eleventh valve, the sixteenth valve, the twentieth valve, the fourth circulating water pump, the sixth circulating water pump, and the seventh circulating water pump and opening the fourteenth valve, such that heat net backwater flows to the waste heat recovering and absorbing heat pump and the high temperature flue gas-water heat exchanger, respectively, and then is supplied to heat net water supply pipelines after being heated by flue gas, the energy storing electric heat pump is now in operation, consuming an amount of generated electricity from the combined heating power and cooling apparatus while recovering flue gas waste heat of the low temperature flue gas-water heat exchanger; opening the fourth valve, the fifth valve, the third valve, the sixth valve, the second circulating water pump, and the third circulating water pump and opening the first valve, the second valve, and the first circulating water pump simultaneously, such that stored water in the high temperature energy storing canister flows to the condenser of the energy storing electric heat pump and then returns back to the high temperature energy storing canister after being heated, stored water in the low temperature energy storing canister flows to the first evaporator of the energy storing electric heat pump and returns back to the low temperature energy storing canister after being cooled, after recovering the flue gas waste heat, cooling water in a low temperature flue gas condensation heat exchanger flows to the second evaporator of the energy storing electric heat pump and then returns back to the low temperature flue gas condensation heat exchanger after being cooled to continue to absorb the flue gas waste heat;b) when the apparatus is operated during electrical load means in winter, disabling each of the energy storing electric heat pump, the second circulating water pump, the third circulating water pump, and the first circulating water pump, and operating other parts as the same as those in the electrical load valleys; andc) when the apparatus is operated during electric load peaks in winter, that is, when more generated electricity from the system is required on grid, closing each of the eighteenth valve, the twenty-first valve, the seventh valve, the thirteenth valve, the fourth valve, the fifth valve, the third valve, the sixth valve, the fourteenth valve, and the ninth valve; opening each of the seventeenth valve, the twenty-second valve, the fifth circulating pump, the first valve, the second valve, the eighth valve, the twelfth valve, the fifteenth valve, and the nineteenth valve; disabling each of the energy storing electric heat pump, the second circulating water pump, the third circulating water pump, the first circulating water pump, and the seventh circulating water pump; opening each of the sixteenth valve, the eleventh valve, the tenth valve, and the twentieth valve and opening each of the fourth circulating water pump and the sixth circulating water pump, such that the sixth circulating water pump draws low temperature water out of the low temperature energy storing canister and delivers it to the low temperature flue gas condensation heat exchanger, after recovering the flue gas waste heat, the low temperature water is converged with the heat net backwater and then is delivered to the high temperature flue gas-water heat exchanger for further recovering of the flue gas waste heat, the heated water is divided into two streams, one of which returns back to the low temperature energy storing canister, and another enters into the high temperature energy storing canister, such that high temperature water in the high temperature energy storing canister is pressed out and delivered to a heat supply pipe network; and 2). the combined heating power and cooling apparatus with energy storage type is caused to operate during electrical load valleys, means, and peaks in summer through different combinations of valve opening and closing, the particular operating process comprising:a) when the apparatus is operated during electrical load valleys in summer, that is, when the active distribution network needs to be operated in a lowered electrical load, closing each of the ninth valve, the fourteenth valve, the sixteenth valve, the eleventh valve, the tenth valve, the twentieth valve, the first valve, the second valve, the fourth circulating water pump, and the sixth circulating water pump, such that the energy storing electric heat pump is now in operation, consuming the amount of generated electricity from the combined heating power and cooling apparatus; opening the fourth valve, the fifth valve, the third valve, the sixth valve, the twelfth valve, the nineteenth valve, the second circulating water pump, the third circulating water pump, the first circulating water pump, and the seventh circulating water pump, such that backwater of a user cooling supply pipeline enters into the second evaporator of the energy storing electric heat pump and is delivered to supplied water of the user cooling supply pipeline, stored water in the high temperature energy storing canister flows into the condenser of the energy storing electric heat pump and returns back to the high temperature energy storing canister after being heated, the stored water in the low temperature energy storing canister flows into the first evaporator of the energy storing electric heat pump and returns back to the low temperature energy storing canister after being cooled; closing the seventeenth valve and the twenty-second valve and opening the eighteenth valve, the twenty-first valve, and the fifth circulating water pump, such that the waste heat recovering and absorbing heat pump switches to a cooling operating condition for cooling supply; opening each of the seventh valve and the thirteenth valve, such that the cooling water switches to the cooling tower for dissipating heat; for a supply part of domestic hot water, closing both the eighth valve and the fifteenth valve, such that each of the high temperature flue gas-water heat exchanger, the medium temperature flue gas-water heat exchanger, and the low temperature flue gas-water heat exchanger recovers the flue gas waste heat for supplying to the domestic hot water;b) when the apparatus is operated during electrical load means in summer, disabling each of the energy storing electric heat pump, the second circulating water pump, the third circulating water pump, and the first circulating water pump, and operating other parts as the same as those in electrical load valleys; andc) when the apparatus is operated during electrical load peaks in summer, that is, when more generated electricity from the system is required, closing each of the twelfth valve, the nineteenth valve, the seventeenth valve, and the twenty-second valve and opening the eighteenth valve, the twenty-first valve, and the fifth circulating water pump, such that the waste heat recovering and absorbing heat pump is switched to the cooling operating condition for cooling supply; opening the seventh valve and the thirteenth valve, such that the cooling water is switched to the cooling tower for dissipating heat; closing the fourth valve, the fifth valve, the third valve, the sixth valve, the first valve, and the second valve; disabling the energy storing electric heat pump, the second circulating water pump, the third circulating water pump, and the first circulating water pump; opening the sixteenth valve, the eleventh valve, the tenth valve, the ninth valve, the tenth valve, the eighth valve, the fifteenth valve, and the fourteenth valve and opening each of the fourth circulating water pump, the sixth circulating water pump, and the seventh circulating water pump, such that the fourth circulating water pump dissipates heat in the high temperature energy storing canister to the cooling tower, or supplies it to domestic hot water, and the sixth circulating water pump draws the low temperature water out of the low temperature energy storing canister and delivers it to a user for cooling supply.


Wang H.,Tsinghua University | Wang H.,Beihang University | Feng H.,Tsinghua University | Li J.,Tsinghua University
Small | Year: 2014

Being confronted with the energy crisis and environmental problems, the exploration of clean and renewable energy materials as well as their devices are urgently demanded. Two-dimensional (2D) atomically-thick materials, graphene and grpahene-like layered transition metal dichalcogenides (TMDs), have showed vast potential as novel energy materials due to their unique physicochemical properties. In this Review, we outline the typical application of graphene and grpahene-like TMDs in energy conversion and storage fields, and hope to promote the development of 2D TMDs in this field through the analysis and comparisons with the relatively natural graphene. First, a brief introduction of electronic structures and basic properties of graphene and TMDs are presented. Then, we summarize the exciting progress of these materials made in both energy conversion and storage field including solar cells, electrocatalysis, supercapacitors and lithium ions batteries. Finally, the prospects and further developments in these exciting fields of graphene and graphene-like TMDs materials are also suggested. This review summarizes recent progress of graphene and graphene-like layered transition metal dichalcogenide in energy conversion and storage application, including solar cells, electrocatalysis, supercapacitors, and lithium-ion batteries. Prospects and further developments in this exciting field are also discussed. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Document Keywords (matching the query): energy conversion and storages, storage materials, energy conversion, lithium ion battery, energy storage, energy policy.


Wang X.,Tsinghua University | Shi G.,Tsinghua University
Energy and Environmental Science | Year: 2015

Graphene is a unique and attractive energy material because of its atom-thick two-dimensional structure and excellent properties. Graphene sheets are also mechanically strong and flexible. Thus, graphene materials are expected to have wide and practical applications in bendable, foldable and/or stretchable devices related to energy conversion and storage. We present a review on the recent advancements in flexible graphene energy devices including photovoltaic devices, fuel cells, nanogenerators (NGs), supercapacitors (SCs) and batteries, and the devices related to energy conversion such as organic light-emitting diodes (OLEDs), photodetectors and actuators. The strategies for synthesizing flexible graphene materials will be summarized and the challenges facing the design and construction of the devices will be discussed. © 2015 The Royal Society of Chemistry.

Document Keywords (matching the query): energy conservation, energy conversion and storages, energy conversion, energy materials.


Li C.,Tsinghua University | Shi G.,Tsinghua University
Advanced Materials | Year: 2014

Chemically modified graphene (CMG) materials have been extensively studied because of their unique structures, excellent properties, and potential applications in energy storage and conversion, catalysis, and environment remediation. However, the unique two-dimensional structure and amphiphilicity make CMG sheets easily restack into irregular aggregates, which greatly reduces their accessible surface area, and thereby deteriorates their performance in practical applications. To exploit their inherent properties fully, CMGs usually have to be fabricated or assembled into functional gels with desired three-dimensional (3D) interconnected porous microstructures. In this review, we summarize the recent achievements in the synthesis of CMG-based functional gels, including hydrogels, organogels, aerogels, and their composites. The mechanisms of gel formation and the applications of these functional gels will also be discussed. Self-assembly of chemically modified graphenes (CMGs) can produce functional gels with three-dimensional (3D) interconnected porous microstructures. The 3D microstructures provide CMG gels with large accessible specific surface areas and improved properties. In this review paper, the methodologies for synthesizing CMG gels and their composites are summarized. The mechanisms of CMG gelation and the applications of CMG gel are also highlighted. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Document Keywords (matching the query): energy storage, energy storage and conversions, energy storage and conversion.


Pei P.,Tsinghua University | Wang K.,Tsinghua University | Ma Z.,Tsinghua University
Applied Energy | Year: 2014

Zinc-air batteries are devices which convert chemical energy into electrical energy and vice versa during charge/discharge. Zinc-air battery has been used for a long time due to its high energy density, great availability and low-level pollution, and zinc-air primary battery has already commercialized in hearing aids, navigation lights, and railway signals so forth; while the problem of cyclelife limits rechargeable zinc-air battery applied to the fields of transportation and energy storage. To thoroughly understand the nature of electrically rechargeable zinc-air battery, we have made detailed failure mechanism investigations of zinc electrode, air electrode, electrolyte, and separator meanwhile research progress of a rechargeable zinc-air battery respectively based on bifunctional air electrode and triple electrodes described in this work have been analyzed in comparison. Furthermore, working conditions including air system, electrolyte system and charge-discharge modes influencing zinc-air battery's cyclelife have been discussed as well. The corresponding solutions are also provided for extending cyclelife of the battery, such as horizontal configuration, flowing electrolyte, pulsating currents, corrosion inhibitors, triple electrodes and so on. These causes and measures will help improve the cyclelife and performance of zinc-air batteries, and thus offer an alternative to energy storage and transportation. © 2014 Elsevier Ltd.

Document Keywords (matching the query): energy storage, zinc air batteries, zinc air battery.


Yu Y.-X.,Tsinghua University
Journal of Materials Chemistry A | Year: 2013

It is known that low-dimensional carbon allotropes can be used as a new class of anode materials for lithium-ion batteries. However, the existing carbon allotropes cannot meet the increasing energy and power demand, and thus there is still a need for further development of new materials for lithium-ion batteries. In the present work, a new graphene allotrope, known as graphenylene, is found to be capable of storing lithium with greater density of energy. Ab initio density functional theory calculations indicate that the unique dodecagonal holes in graphenylene enable lithium ions to diffuse both on and through graphenylene layers with energy barriers no higher than 0.99 eV. Adsorption of a lithium atom on graphenylene is stronger than that on pristine graphene. The highest lithium storage capacities for monolayer and bilayer graphenylene compounds are Li3C6 and Li 2.5C6, respectively, which correspond to specific capacities of 1116 and 930 mA h g-1. Both specific and volumetric capacities of lithium-intercalated graphenylene compounds are significantly larger than those for graphene. The high lithium mobility and large lithium storage capacity demonstrate that graphenylene is a promising anode material for modern lithium-ion batteries. This journal is © The Royal Society of Chemistry 2013.

Document Keywords (matching the query): lithium storage capacity, lithium batteries, lithium ion battery.


Patent
Tsinghua University and Hon Hai Precision Industry Co. | Date: 2014-08-05

A hybrid energy storage device includes a positive pole formed by stacking a supercapacitor first electrode and a battery positive electrode, a negative pole formed by stacking a supercapacitor second electrode and a battery negative electrode, and a separator located between the positive pole and the negative pole. The supercapacitor second electrode, the battery negative electrode, the supercapacitor first electrode, the battery positive electrode, and the separator are planar structures. The supercapacitor first electrode, the supercapacitor second electrode, the battery positive electrode, the battery negative electrode, the separator and electrolyte are packaged in a shell.

Claims which contain your search:

1. A hybrid energy storage device, comprising: a positive pole comprising a supercapacitor first electrode and a battery positive electrode stacked with each other, wherein the supercapacitor first electrode and the battery positive electrode are planar structures; a negative pole comprising a supercapacitor second electrode and a battery negative electrode stacked with each other, wherein the supercapacitor second electrode and the battery negative electrode are planar structures; a separator located between the positive pole and the negative pole, wherein the separator is a planar structure; and a shell housing the supercapacitor first electrode, the supercapacitor second electrode, the battery positive electrode, the battery negative electrode, the separator and electrolyte, wherein the supercapacitor first electrode, the supercapacitor second electrode, the battery positive electrode, the battery negative electrode, and the separator are located in the electrolyte.

2. The hybrid energy storage device of claim 1, wherein the battery positive electrode is located between the supercapacitor first electrode and the separator, and the battery negative electrode is located between the supercapacitor second electrode and the separator.

3. The hybrid energy storage device of claim 1, wherein the supercapacitor first electrode is located between the battery positive electrode and the separator, and the supercapacitor second electrode is located between the battery negative electrode and the separator.

4. The hybrid energy storage device of claim 1, wherein a weight ratio between the battery positive electrode and the supercapacitor first electrode is in a range from about 1000:1 to about 125:1, and the weight ratio between the battery negative electrode and the supercapacitor second electrode is in a range from about 1000:1 to about 125:1.

5. The hybrid energy storage device of claim 1, wherein a weight ratio between the battery positive electrode and the supercapacitor first electrode is about 1000:3, and the weight ratio between the battery negative electrode and the supercapacitor second electrode is about 1000:3.

6. The hybrid energy storage device of claim 1, wherein the supercapacitor first electrode and the supercapacitor second electrode are made of a carbon nanotube/polyaniline composite film.

7. The hybrid energy storage device of claim 6, wherein the carbon nanotube/polyaniline composite film having a plurality of micropores comprises a carbon nanotube network structure and a polyaniline layer coating the carbon nanotube network structure.

8. The hybrid energy storage device of claim 7, wherein the carbon nanotube network structure comprises a plurality of carbon nanotubes disorderly arranged and parallel to a surface of the carbon nanotube network structure.

9. The hybrid energy storage device of claim 8, wherein the plurality of micropores is formed by adjacent carbon nanotubes of the carbon nanotube network structure.

10. The hybrid energy storage device of claim 1, wherein the battery positive electrode is made of carbon nanotube/lead dioxide composite material, and the battery negative electrode is made of carbon nanotube/lead composite material.

11. The hybrid energy storage device of claim 1, wherein the battery positive electrode is made of carbon nanotube/manganese dioxide composite material, and the battery negative electrode is made of carbon nanotube/zinc composite material.

12. A hybrid energy storage device, comprising: a positive pole comprising a supercapacitor first electrode and a battery positive electrode stacked with each other; a negative pole comprising a supercapacitor second electrode and a battery negative electrode stacked with each other; a separator located between the positive pole and the negative pole; and a shell housing the supercapacitor first electrode, the supercapacitor second electrode, the battery positive electrode, the battery negative electrode, the separator and electrolyte, wherein the supercapacitor first electrode, the supercapacitor second electrode, the battery positive electrode, the battery negative electrode, and the separator are located in the electrolyte; wherein a weight ratio between the battery positive electrode and the supercapacitor first electrode is in a range from about 1000:1 to about 125:1, and the weight ratio between the battery negative electrode and the supercapacitor second electrode is in a range from about 1000:1 to about 125:1.

13. The hybrid energy storage device of claim 12, wherein the weight ratio between the battery positive electrode and the supercapacitor first electrode is about 1000:3, and the weight ratio between the battery negative electrode and the supercapacitor second electrode is about 1000:3.

14. The hybrid energy storage device of claim 12, wherein the battery positive electrode is located between the supercapacitor first electrode and the separator, and the battery negative electrode is located between the supercapacitor second electrode and the separator.

15. The hybrid energy storage device of claim 12, wherein the supercapacitor first electrode is located between the battery positive electrode and the separator, and the supercapacitor second electrode is located between the battery negative electrode and the separator.

16. The hybrid energy storage device of claim 12, wherein the supercapacitor first electrode and the supercapacitor second electrode are made of a carbon nanotube/polyaniline composite film.

17. The hybrid energy storage device of claim 16, wherein the carbon nanotube/polyaniline composite film having a plurality of micropores comprises a carbon nanotube network structure and a polyaniline layer coating the carbon nanotube network structure.

18. The hybrid energy storage device of claim 12, wherein the battery positive electrode is made of carbon nanotube/lead dioxide composite material, and the battery negative electrode is made of carbon nanotube/lead composite material.

19. The hybrid energy storage device of claim 12, wherein the battery positive electrode is made of carbon nanotube/manganese dioxide composite material, and the battery negative electrode is made of carbon nanotube/zinc composite material.

20. A hybrid energy storage device, comprising: a positive pole comprising a supercapacitor first electrode and a battery positive electrode stacked with each other, wherein the supercapacitor first electrode and the battery positive electrode are planar structures; a negative pole comprising a supercapacitor second electrode and a battery negative electrode stacked with each other, wherein the supercapacitor second electrode and the battery negative electrode are planar structures; a separator located between the positive pole and the negative pole, wherein the separator is a planar structure; and electrolyte infiltrating the supercapacitor first electrode, the supercapacitor second electrode, the battery positive electrode, the battery negative electrode, and the separator.


Patent
Tsinghua University and Hon Hai Precision Industry Co. | Date: 2014-08-05

A hybrid energy storage device includes a positive pole including a supercapacitor first electrode and a battery positive electrode located in a same plane and contacts with each other, a negative pole including a supercapacitor second electrode and a battery negative electrode located in a same plane and contacts with each other, and a separator located between the positive pole and the negative pole. The supercapacitor second electrode, the battery negative electrode, the supercapacitor first electrode, the battery positive electrode, and the separator are planar structures. The supercapacitor first electrode, the supercapacitor second electrode, the battery positive electrode, the battery negative electrode, the separator and electrolyte are packaged in a shell.

Claims which contain your search:

1. A hybrid energy storage device, comprising: a positive pole comprising a supercapacitor first electrode and a battery positive electrode located in a same plane and electrically connected with each other, wherein the supercapacitor first electrode and the battery positive electrode are planar structures; a negative pole comprising a supercapacitor second electrode and a battery negative electrode located in a same plane and electrically connected with each other, wherein the supercapacitor second electrode and the battery negative electrode are planar structures; a separator located between the positive pole and the negative pole, wherein the separator is a planar structure; and a housing having the supercapacitor first electrode, the supercapacitor second electrode, the battery positive electrode, the battery negative electrode, the separator and electrolyte located therein; wherein the supercapacitor first electrode, the supercapacitor second electrode, the battery positive electrode, the battery negative electrode, and the separator are located in the electrolyte.

2. The hybrid energy storage device of claim 1, wherein the battery positive electrode is directly opposite to the battery negative electrode, and the supercapacitor first electrode is directly opposite to the supercapacitor second electrode.

3. The hybrid energy storage device of claim 2, wherein a first side of the supercapacitor first electrode contacts with a second side of the battery positive electrode, and a third side of the supercapacitor second electrode contacts with a fourth side of the battery negative electrode.

4. The hybrid energy storage device of claim 1, wherein a weight ratio between the battery positive electrode and the supercapacitor first electrode is in a range from about 1000:1 to about 125:1, and the weight ratio between the battery negative electrode and the supercapacitor second electrode is in a range from about 1000:1 to about 125:1.

5. The hybrid energy storage device of claim 1, wherein a weight ratio between the battery positive electrode and the supercapacitor first electrode is about 1000: 3, and the weight ratio between the battery negative electrode and the supercapacitor second electrode is about 1000:3.

6. The hybrid energy storage device of claim 1, wherein the supercapacitor first electrode and the supercapacitor second electrode comprise a carbon nanotube/polyaniline composite film.

7. The hybrid energy storage device of claim 6, wherein the carbon nanotube/polyaniline composite film having a plurality of micropores comprises a carbon nanotube network structure and a polyaniline layer coating the carbon nanotube network structure.

8. The hybrid energy storage device of claim 7, wherein the carbon nanotube network structure comprises a plurality of carbon nanotubes disorderly arranged and parallel to a surface of the carbon nanotube network structure.

9. The hybrid energy storage device of claim 8, wherein the plurality of micropores is defined by adjacent carbon nanotube of the carbon nanotube network structure.

10. The hybrid energy storage device of claim 1, wherein the battery positive electrode comprises a carbon nanotube/lead dioxide composite material, and the battery negative electrode comprises a carbon nanotube/lead composite material.

11. The hybrid energy storage device of claim 1, wherein the battery positive electrode comprises a carbon nanotube/manganese dioxide composite material, and the battery negative electrode comprises a carbon nanotube/zinc composite material.

12. A hybrid energy storage device, comprising: a positive pole comprising a supercapacitor first electrode and a battery positive electrode located in a same plane and electrically connected with each other; a negative pole comprising a supercapacitor second electrode and a battery negative electrode located in a same plane and electrically connected with each other; a separator located between the positive pole and the negative pole; and a housing having the supercapacitor first electrode, the supercapacitor second electrode, the battery positive electrode, the battery negative electrode, the separator and electrolyte located therein; wherein the supercapacitor first electrode, the supercapacitor second electrode, the battery positive electrode, the battery negative electrode, and the separator are located in the electrolyte; wherein a weight ratio between the battery positive electrode and the supercapacitor first electrode is in a range from about 1000:1 to about 125:1, and the weight ratio between the battery negative electrode and the supercapacitor second electrode is in a range from about 1000:1 to about 125:1.

13. The hybrid energy storage device of claim 12, wherein the weight ratio between the battery positive electrode and the supercapacitor first electrode is about 1000:3, and the weight ratio between the battery negative electrode and the supercapacitor second electrode is about 1000:3.

14. The hybrid energy storage device of claim 12, wherein the battery positive electrode is directly opposite to the battery negative electrode, and the supercapacitor first electrode is directly opposite to the supercapacitor second electrode.

15. The hybrid energy storage device of claim 14, wherein a first side of the supercapacitor first electrode contacts with a second side of the battery positive electrode, and a third side of the supercapacitor second electrode contacts with a fourth side of the battery negative electrode.

16. The hybrid energy storage device of claim 12, wherein the supercapacitor first electrode and the supercapacitor second electrode comprise a carbon nanotube/polyaniline composite film.

17. The hybrid energy storage device of claim 16, wherein the carbon nanotube/polyaniline composite film having a plurality of micropores comprises a carbon nanotube network structure and a polyaniline layer coating the carbon nanotube network structure.

18. The hybrid energy storage device of claim 12, wherein the battery positive electrode comprises a carbon nanotube/lead dioxide composite material, and the battery negative electrode comprises a carbon nanotube/lead composite material.

19. The hybrid energy storage device of claim 12, wherein the battery positive electrode comprises a carbon nanotube/manganese dioxide composite material, and the battery negative electrode comprises a carbon nanotube/zinc composite material.

20. A hybrid energy storage device, comprising: a positive pole comprising a supercapacitor first electrode and a battery positive electrode located in a same plane and contacts with each other; a negative pole comprising a supercapacitor second electrode and a battery negative electrode located in a same plane and contacts with each other; a separator located between the positive pole and the negative pole; and electrolyte infiltrating the supercapacitor first electrode, the supercapacitor second electrode, the battery positive electrode, the battery negative electrode, and the separator.


An integrated DC/DC converter includes a first DC/DC converter, a second DC/DC converter, a first voltage sensor, a second voltage sensor, a first current sensor, a second current sensor, a third current sensor, and a controller. The first DC/DC converter has an input end and an output end. The input end of the first DC/DC converter is to be electrically connected to an output end of an electrochemical energy storage apparatus. The output end of the first DC/DC converter is to be electrically connected to an input end of an electrical load. The second DC/DC converter connects the first DC/DC converter in parallel.

Claims which contain your search:

1. An integrated DC/DC converter comprising: a first DC/DC converter comprising a first DC/DC converter input end that is electrically connected to an electrochemical energy storage apparatus, and a first DC/DC converter output end that is electrically connected to an electrical load input end; a second DC/DC converter connected to the first DC/DC converter in parallel; a first voltage sensor electrically connected in parallel with the first DC/DC converter input end, the first voltage sensor is capable of detecting an electrochemical energy storage apparatus output voltage; a second voltage sensor electrically connected in parallel to the first DC/DC converter output end, the second voltage sensor is capable of detecting a first DC/DC converter output voltage; a first current sensor connected in series to an electrochemical energy storage apparatus output end, the first current sensor is capable of detecting an electrochemical energy storage apparatus output current; a second current sensor connected in series to an second DC/DC converter input end, the second current sensor is capable of detecting a second DC/DC converter input current; a third current sensor connected in series to the first DC/DC converter output end, the third current sensor is capable of detecting a first DC/DC converter output current; and a controller receiving signals from the first voltage sensor, the second voltage sensor, the first current sensor, the second current sensor, the third current sensor, and the forth current sensor; the controller is capable of controlling the first DC/DC converter to adjust an output of the electrochemical energy storage apparatus and controlling on and off of the second DC/DC converter, and the controller is also capable of controlling the second DC/DC converter at an on state to adjust the electrochemical energy storage apparatus output current in a current disturbance way to obtain an electrochemical impedance spectroscopy of the electrochemical energy storage apparatus.

3. The integrated DC/DC converter of claim 1 further comprising a voltage inspecting device that is capable of acquiring voltage of each of a plurality of electrochemical energy storage cells in the electrochemical energy storage apparatus, and sending the voltage to the controller.

7. An electrochemical energy storage system comprising an electrochemical energy storage apparatus, a control system, and an integrated DC/DC converter, the control system is capable of maintaining a stable electric energy output of the electrochemical energy storage apparatus, the integrated DC/DC converter comprising: a first DC/DC converter having a first DC/DC converter input end and a first DC/DC converter output end, the first DC/DC converter input end is electrically connected to an electrochemical energy storage apparatus, the first DC/DC converter output end is electrically connected to an electrical load; a second DC/DC converter connecting the first DC/DC converter in parallel, the second DC/DC converter having a second DC/DC converter input end and a second DC/DC converter output end; a first voltage sensor electrically connected in parallel with the first DC/DC converter input end to detect an electrochemical energy storage apparatus output voltage; a second voltage sensor electrically connected in parallel to the first DC/DC converter output end, the second voltage sensor is capable of detecting a first DC/DC converter output voltage; a first current sensor connected to the electrochemical energy storage apparatus in series, the first current sensor is capable of detecting an output current of the electrochemical energy storage apparatus; a second current sensor connected to the second DC/DC converter input end in series, the second current sensor is capable of detecting a second DC/DC converter input current; a third current sensor connected to the first DC/DC converter output end in series, the third current sensor is capable of detecting a first DC/DC converter output current; and a controller receiving signals from the first voltage sensor, the second voltage sensor, the first current sensor, the second current sensor, and the third current sensor, the controller controlling the first DC/DC converter, the controller is capable of adjusting an output of the electrochemical energy storage apparatus and controlling on and off of the second DC/DC converter, and the controller is also capable of controlling the second DC/DC converter at an on state to adjust an electrochemical energy storage apparatus output current in a current disturbance way to obtain an electrochemical impedance spectroscopy of the electrochemical energy storage apparatus.

8. The electrochemical energy storage system of claim 7 further comprising a second electrochemical energy storage apparatus connected to the integrated DC/DC converter output end, and the electrical load is connected to the second electrochemical energy storage apparatus in parallel.

9. The electrochemical energy storage system of claim 8, wherein the electrical load is an electric motor.

10. The electrochemical energy storage system of claim 7, wherein the electrochemical energy storage apparatus comprises an electrochemical energy storage cell.

11. The electrochemical energy storage system of claim 10, wherein the electrochemical energy storage cell is at least one of a fuel cell, a lithium battery, and a supercapacitor.

12. A method for analyzing an electrochemical impedance spectroscopy of an electrochemical energy storage apparatus comprising: S1, supplying an electric current to a second DC/DC converter to generate a current disturbance signal; S2, disturbing an output current of the electrochemical energy storage apparatus by the current disturbance signal; S3, detecting a disturbed output current and disturbed output voltage of the electrochemical energy storage apparatus; S4, calculating an impedance corresponding to a frequency of the current disturbance signal based on the current disturbance signal, the disturbed output current, and the disturbed output voltage; and S5, varying the frequency of the current disturbance signal and disturbing again the output current of the electrochemical energy storage apparatus.

13. The method of claim 12, further comprising a step of generating the current disturbance signal comprising: S11, deciding whether or not to perform an analyzing of electrochemical impedance, whereinif an answer is yes, the second DC/DC converter is electrically conducted, and meanwhile step Sif the answer is no, the second DC/DC converter is not electrically conducted; S12, selecting a frequency used in the analyzing of the electrochemical impedance; S13, determining a current disturbance signal amplitude corresponding to the frequency; S14, defining the current disturbance signal having the current disturbance signal amplitude and the frequency; S15, detecting the output current of the electrochemical energy storage apparatus and a second DC/DC converter input current; and S16, judging whether the second DC/DC converter input current is substantially equal to the current disturbance signal, wherein if the second DC/DC converter input current is not substantially equal to the current disturbance signal, then the on and off of switches in the second DC/DC converter is controlled by a controller to achieve the current disturbance signal.

15. The method of claim 12, wherein a value of the amplitude of the current disturbance signal is 1% to 10% of the output current of the electrochemical energy storage apparatus.

16. The method of claim 12, wherein step S 3 comprises the following steps: S31, continuously recording the output current of the electrochemical energy storage apparatus and the second DC/DC converter input current of the for a period of time; S32, deciding whether or not being capable of analyzing current disturbance signal based on recorded currents, to calculate the electrochemical impedance, wherein if an answer is no, then performing again step S31, and if the answer is yes, then performing step S33; S33, further continuously recording the output current and output voltage of the electrochemical energy storage apparatus for a further period of time; and S34, calculating the electrochemical impedance and phase at selected frequency based on the output current and output voltage.

18. The method of claim 12, wherein the disturbed output current i satisfies equation (3), wherein equation (3) is i=I _(1)+Isin(2ft+ _(1)), wherein, I_(1 )is the output current of the electrochemical energy storage apparatus, T is the amplitude of the current disturbance signal, f is the frequency of the current disturbance signal, t is a period of time, and _(1 )is an original phase of the current disturbance signal; disturbed output voltage u responded to the current disturbance signal satisfies equation (4), wherein equation (4) is u=U_(1)+Usin(2ft+_(1)+), wherein U_(1 )is the output voltage of the electrochemical energy storage apparatus, U is an amplitude of the voltage response disturbance signal to the current disturbance signal, f is the frequency of a response signal, which is equal to a selected frequency of the current disturbance signal, t is a period of time, _(1 )is an original phase of the current disturbance signal, the is a lacking phase of the response signal comparing to the current disturbance signal; and the electrochemical impedance of the electrochemical energy storage apparatus at the selected frequency f is calculated by equation (5), wherein equation (5) is

19. The method of claim 12, wherein the electrochemical energy storage apparatus comprises a plurality of electrochemical energy storage cells, the output voltage and output current of each of the plurality of electrochemical energy storage cells are detected, and the electrochemical impedance spectroscopy of each of the electrochemical energy storage cells are achieved respectively.


News Article | April 28, 2016
Site: www.materialstoday.com

The secret to making the best energy storage materials is growing them with as much surface area as possible. This requires just the right mixture of ingredients prepared in a specific amount and order at just the right temperature to produce a thin sheet of material with the perfect chemical consistency to store energy. A team of researchers from Drexel University, and Huazhong University of Science and Technology (HUST) and Tsinghua University in China, recently discovered a way to improve the recipe and make the resulting materials both bigger and better at soaking up energy. The secret? Just add salt. The team's findings, which are published in a paper in Nature Communications, show that using salt crystals as a template to grow thin sheets of conductive metal oxides produces materials that are larger and possess a greater chemical purity, making them better suited for gathering ions and storing energy. "The challenge of producing a metal oxide that reaches theoretical performance values is that the methods for making it inherently limit its size and often foul its chemical purity, which makes it fall short of predicted energy storage performance," said Jun Zhou, a professor at HUST's Wuhan National Laboratory for Optoelectronics and an author of the paper. "Our research reveals a way to grow stable oxide sheets with less fouling that are on the order of several hundreds of times larger than the ones that are currently being fabricated." In an energy storage device – a battery or a capacitor, for example – energy is contained in the chemical transfer of ions from an electrolyte solution to thin layers of conductive materials. As these devices evolve, they're becoming smaller and capable of holding an electric charge for longer periods of time without needing a recharge. The reason for their improvement is that researchers are fabricating materials that are better equipped, structurally and chemically, for collecting and disbursing ions. In theory, the best materials for the job should be thin sheets of metal oxides, because their chemical structure and high surface area makes it easy for ions to bind to them – which is how energy storage occurs. But the metal oxide sheets that have been fabricated in labs thus far have fallen well short of their theoretical capabilities. According to the researchers, the problem lies in the process of making the metal oxide nanosheets, which involves either deposition from a gas or chemical etching. Both these processes often leave trace chemical residues that contaminate the material and prevent ions from bonding to it. In addition, materials made in this way are often just a few square micrometers in size. Using salt crystals as a substrate for growing the metal oxide crystals lets them spread out and form a larger sheet of oxide material. Analogous to making a waffle by dripping batter into a pan versus pouring it into a big waffle iron, the key to getting a big, sturdy product is getting the solution – be it batter or a chemical compound – to spread evenly over the template and stabilize in a uniform way. "This method of synthesis, called 'templating' – where we use a sacrificial material as a substrate for growing a crystal – is used to create a certain shape or structure," explained Yury Gogotsi, a professor in Drexel's College of Engineering and head of the A.J. Drexel Nanomaterials Institute, who was another author of the paper. "The trick in this work is that the crystal structure of salt must match the crystal structure of the oxide, otherwise it will form an amorphous film of oxide rather than a thin, strong and stable nanocrystal. This is the key finding of our research – it means that different salts must be used to produce different oxides." Researchers have used a variety of chemicals, compounds, polymers and objects as growth templates for nanomaterials, but this discovery shows the importance of matching a template to the structure of the material being grown. Salt crystals turn out to be the perfect substrate for growing oxide sheets of magnesium, molybdenum and tungsten. The precursor solution coats the sides of the salt crystals as the oxides begin to form. After they've solidified, the salt is dissolved in a wash, leaving nanometer-thin two-dimensional (2D) sheets on the sides of the salt crystals – and little trace of any contaminants that might hinder their energy storage performance. By making oxide nanosheets in this way, the only factors that limit their growth are the size of the salt crystals and the amount of precursor solution used. "Lateral growth of the 2D oxides was guided by salt crystal geometry and promoted by lattice matching and the thickness was restrained by the raw material supply. The dimensions of the salt crystals are tens of micrometers and guide the growth of the 2D oxide to a similar size," the researchers write in the paper. "On the basis of the naturally non-layered crystal structures of these oxides, the suitability of salt-assisted templating as a general method for synthesis of 2D oxides has been convincingly demonstrated." As predicted, the larger size of the oxide sheets equated to a greater ability to collect and disburse ions from an electrolyte solution – the ultimate test for energy storage devices. Results reported in the paper suggest that use of these materials may help in creating an aluminum-ion battery that could store more charge than the best lithium-ion batteries found in laptops and mobile devices today. Gogotsi, along with his students in Drexel’s Department of Materials Science and Engineering, has been collaborating with HUST since 2012 to explore a wide variety of materials for energy storage applications. The lead author of the Nature Communications paper, Xu Xiao, and co-author Tiangi Li, both Zhou's doctoral students, came to Drexel as exchange students to learn about its supercapacitor research. Those visits started a collaboration that was supported by Gogotsi's annual trips to HUST. While the partnership has already yielded five joint publications, Gogotsi speculates that this work is just beginning. "The most significant result of this work thus far is that we've demonstrated the ability to generate high-quality 2D oxides with various compositions," Gogotsi said. "I can certainly see expanding this approach to other oxides that may offer attractive properties for electrical energy storage, water desalination membranes, photocatalysis and other applications." This story is adapted from material from Drexel University, with editorial changes made by Materials Today. The views expressed in this article do not necessarily represent those of Elsevier. Link to original source.

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