Zhang L.,Beijing Institute of Technology |
Li N.,Beijing Institute of Technology |
Wu B.,Beijing Institute of Technology |
Wu B.,Power-battery |
And 5 more authors.
Nano Letters | Year: 2015
High-energy and high-power Li-ion batteries have been intensively pursued as power sources in electronic vehicles and renewable energy storage systems in smart grids. With this purpose, developing high-performance cathode materials is urgently needed. Here we report an easy and versatile strategy to fabricate high-rate and cycling-stable hierarchical sphered cathode Li1.2Ni0.13Mn0.54Co0.13O2, by using an ionic interfusion method. The sphere-shaped hierarchical cathode is assembled with primary nanoplates with enhanced growth of nanocrystal planes in favor of Li+ intercalation/deintercalation, such as (010), (100), and (110) planes. This material with such unique structural features exhibits outstanding rate capability, cyclability, and high discharge capacities, achieving around 70% (175 mAh g-1) of the capacity at 0.1 C rate within about 2.1 min of ultrafast charging. Such cathode is feasible to construct high-energy and high-power Li-ion batteries. © 2014 American Chemical Society.
INTELEC, International Telecommunications Energy Conference (Proceedings) | Year: 2012
With over 20 years of continuous monitoring of batteries, archival of a trillion points of data, timelines, and trends of over 1.2 million battery units, we are finding some common aging history. © 2012 IEEE.
Qiao Q.Q.,Nankai University |
Zhang H.Z.,Nankai University |
Li G.R.,Nankai University |
Ye S.H.,Nankai University |
And 2 more authors.
Journal of Materials Chemistry A | Year: 2013
Enhancement of the discharge capacity, high-rate capability, and cycle stability of the Li-rich layered Li(Li0.17Ni0.25Mn 0.58)O2 oxide with a large specific capacity is highly significant for high energy lithium-ion batteries. In this work, the Li-rich layered Li(Li0.17Ni0.25Mn0.58)O2 oxide is prepared by a spray-drying method. The surface modification with the Li-Mn-PO4 is introduced onto Li-rich layered Li(Li 0.17Ni0.25Mn0.58)O2 oxide for the first time. It is demonstrated that the surface of Li(Li0.17Ni 0.25Mn0.58)O2 grains is coated with the thin amorphous Li-Mn-PO4 layer (5 wt%). With increasing calcination temperature after the surface coating, a strong interaction can be induced on the interface between the amorphous Li-Mn-PO4 layer and the top surface of Li(Li0.17Ni0.25Mn0.58)O2 grains. As anticipated, the discharge capacity and high-rate capability are obviously improved for the Li-Mn-PO4-coated sample after calcination at 400 °C, while excellent cycle stability is obtained for the Li-Mn-PO 4-coated sample after calcination at 500 °C as compared with the as-prepared Li(Li0.17Ni0.25Mn0.58)O2 oxide during cycling. Apparently, the interface interaction between the amorphous Li-Mn-PO4 layer and the top surface of Li(Li 0.17Ni0.25Mn0.58)O2 grains is responsible for the improvement of the reaction kinetics and the electrochemical cycle stability of Li-Mn-PO4-coated samples. © 2013 The Royal Society of Chemistry.
Zhao R.-R.,South China Normal University |
Hung I.-M.,Yuan Ze University |
Li Y.-T.,Yuan Ze University |
Chen H.-Y.,South China Normal University |
And 2 more authors.
Journal of Alloys and Compounds | Year: 2012
A series of olivine LiFe 1-xCo xPO 4 composites were synthesised by a hydrothermal route under reductive atmosphere. The structure of the prepared samples was characterised by X-ray diffraction. Morphology, particle size, and elemental concentration were observed by scanning electron microscopy, high-resolution transmission electron microscopy, and corresponding EDS mapping, respectively. Raman spectroscopy was employed to study the surface information of the carbon-coated LiFe 1-xCo xPO 4. The electrochemical properties of the samples were studied by AC impedance spectroscopy and charge-discharge instruments at room temperature. The discharge capacity of LiFe 3/4Co 1/4PO 4/C is 170 mAh/g at rate of 0.1 C. LiFe 1-xCo xPO 4 can achieve a higher discharge plateau (∼3.5 V) than does pure LiFePO 4 (∼3.4 V). The results indicate that the Co-doped sample exhibits improved electrochemical performance at low discharge rates. However, XPS results show that the Li-O band stabilises further as the doping amount increase, which is not beneficial to the lithium diffusion coefficient of the compound. © 2011 Elsevier B.V. All rights reserved.
International Conference and Exhibition on High Temperature Electronics, HiTEC 2014 | Year: 2014
This paper covers a new type of batteries that allows the following possibilities for high-temperature applications, namely: (a) safety and full operational capability at temperatures up to 275 °C (527 °F); (b) possibility of battery recharging at high temperatures; (c) full operational capability under severe industrial conditions (vibration, shock); (d) environmental safety under transportation, storage, use and disposal; (e) safety under harsh conditions including emergency situations as a fire (this has been demonstrated with discharge tests of battery prototypes placed in a diesel fuel fire). Two technological generations of the battery prototypes have been designed, fabricated and tested over an operating temperature range of 4 °C (39 °F) to 275 °C (527 °F). The battery prototypes have been also tested under super-harsh conditions. The variety of form-factors is available for this type of batteries, including for their application in MWD/LWD tools and long-term power supply of monitoring systems in producing wells. Efforts are underway to develop the third generation of the batteries of sub-micron size (micro-batteries for microelements including high-temperature ones).
Power-battery and Wang | Date: 2013-02-13
A tab for soft package lithium battery and its method of plating and application are provided. The tab uses SUS430 stainless steel strip, a copper strip, an aluminum strip or a nickel strip as a substrate. A nickel plating layer is plated on one end of one side of the substrate and a tin plating layer is plated on the nickel plating layer, or the tin plating layer is plated on one end of one side of the substrate directly. The thickness of the nickel plating layer is 0.5-2um, and the thickness of the tin plating layer is 3-10um. The tab has a lower manufacturing cost, favorable weldability and appropriate thermal conductivity.
Power-battery | Date: 2012-02-09
The chemical current source can be used in the electrical devices, wherein it is feeding the electrical devices that constantly operate or can temporarily/accidentally be under extreme conditions produced with the different negative factors such as fire, various types of radiation, including heat, electromagnetic etc., various types of mechanical effects, e.g. a blow and so on. The chemical current source consists of a housing with current feedthroughs and solid-state galvanic cells that are arranged within the housing and connected to the current feedthroughs, contain an anode, an electrolyte, a cathode based on solid-state ionic conductors. For the multifunctional use in the electrical device the chemical current source is made as a thermal protection and (or) a protective shield for the protection of the electrical device or some its parts against external effects and (or) environment against effects going from the electrical device or some its parts.
Power-battery | Date: 2013-09-19
31st International Battery Seminar and Exhibit 2014: Primary and Secondary Batteries - Other Technologies | Year: 2014
• Ultra-low power applications range from "fashion and convenience" to medical, safety & asset tracking • Ultra-low power technology continues to evolve - but we already have practical power management solutions today across a broad spectrum of technologies • Key issues: - Special considerations for very small cells • Proper charge control and termination • Charging from various (or "any available") input sources - High efficiency energy conversion even at very low power levels - Capacity Monitoring for very small cells - need ultra low Iq circuits - Wireless charging allows design of weatherproof / waterproof equipment, but TX/RX coils and ICs need to be adapted to low power applications. Copyright © (2014) by Florida Educational Seminars, Inc. All rights reserved.