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An Z.,Shanghai AOWEI Technology Development Co. | An Z.,Shanghai University | Yan L.,Shanghai AOWEI Technology Development Co. | Xia H.,Shanghai AOWEI Technology Development Co. | And 2 more authors.
Materials China | Year: 2016

Lithiumion capacitor (LIC), which combines the high power density of electric double-layer capacitors (EDLC) and high energy density of lithium-ion battery (LIB), vastly suiting the condition demand of electric city bus, energy-saving elevators and the tram, has attracted tremendous interests of researchers from both research institutes and enterprises. Here in this paper, the current advances containing the operating principle, electrode material system and the anode pre-doping technique of LIC are stated concisely. In addition, the self-developed novel LIC, reaching 20 Wh·kg-1or higher for energy density, is introduced as the power supply of pure electric city bus pilot application. The running case as a result evidences that LIC has bright prospect when used for fixed-line electric city bus: (1)more energy storing, which fulfills the whole course less than 20 km after charging once at the original station; (2)advanced communication management system, which could monitor the working condition of LIC timely to prognosis the malfunction, thus improving safety; (3) progressive thermal management system, that the highest temperature of LIC cell is only 3~4℃ higher than that of the ambient environment can withstand the test of sizzler. © 2016, The Editorial Board of Materials China. All right reserved.


Zhang X.,Shanghai JiaoTong University | Wang W.,Shanghai JiaoTong University | Hua L.,Shanghai Aowei Technology Development Co. | Heng J.,Shanghai Aowei Technology Development Co.
Huagong Xuebao/CIESC Journal | Year: 2016

Temperature characteristic is one of the important properties for an electric double layer capacitor (EDLC), and the reversible and irreversible heat are combined with the charging and discharging for an EDLC. In this study, the numerical simulation of heat transfer, conducted with the finite element technology, and temperature measurement inside and outside EDLC were performed during galvanostatic cycling with different current densities. The heat transfer characteristics and temperature distribution were analyzed by the comparison between the simulated and measured temperatures. And then, the variation and the influencing factors of reversible heat and temperature oscillation during galvanostatic cycling were discussed. Meanwhile, the EDLCs need to be cooled during charging and discharging cycles with great current according to the measured results. © All Right Reserved.


Zhang X.,Shanghai JiaoTong University | Wang W.,Shanghai JiaoTong University | Lu J.,Shanghai JiaoTong University | Hua L.,Shanghai Aowei Technology Development Co. | Heng J.,Shanghai Aowei Technology Development Co.
Thermochimica Acta | Year: 2016

Heat generated in electric double-layer capacitors (EDLCs) during charging or discharging includes irreversible and reversible heat, the former is caused by the Joule effect, the latter is attributed to the ion adsorption/desorption at the electrode/electrolyte interface. In this study, the reversible heat of EDLCs is discussed with the surface Gibbs free energy at the electric double-layer, with the model the calculated temperature behaviors for the EDLCs with liquid electrolyte are compared with some experimental data. Temperature profiles and oscillation amplitudes in galvanostatic cycling which are affected by reversible and irreversible heats are discussed in detail. The relations of reversible heat with current as well as electrolyte temperature and concentration are analyzed as well. © 2016 Elsevier B.V. All rights reserved.


Zhang X.,Shanghai Aowei Technology Development Co. | Hua L.,Shanghai Aowei Technology Development Co. | Yang E.,Shanghai Aowei Technology Development Co. | Chen J.,Shanghai Aowei Technology Development Co. | And 4 more authors.
Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering | Year: 2015

Amorphous hydrous ruthenium dioxide RuO2·xH2O was synthesized by a modified neutralization reaction and heat treatment process, and electrochemical performances of the synthesized product were investigated using the graphite plate with high conductivity as current collector. In the experiment a home-made sprayer and sodium dodecyle sulfate (SDS) were used as an assistant technique and dispersive agent, respectively. Results indicate that amorphous and high performance electrode materials with great specific area of 218 m2/g and fluffy and heavy black color morphology can be obtained after the precursor of the synthesized product is annealed at 175℃. Cyclic voltammetry (CV) results show the prepared product is featured with good average specific capacitance (995 F/g at 1 mV/s) and excellent electrochemical rate. It is further proved by electrochemical impedance spectra (EIS) test that the prepared product has lower equivalent serial resistance of ~25 mΩ and good electrochemical rate performance. Copyright © 2015, Northwest Institute for Nonferrous Metal Research. Published by Elsevier BV. All rights reserved.


Hua L.,Shanghai Aowei Technology Development Co. | Yang E.,Shanghai Aowei Technology Development Co. | Liang Q.,Shanghai Aowei Technology Development Co. | Gong Z.,Shanghai Aowei Technology Development Co. | And 3 more authors.
EVS 2010 - Sustainable Mobility Revolution: 25th World Battery, Hybrid and Fuel Cell Electric Vehicle Symposium and Exhibition | Year: 2010

Due to its prevailing advantages of high specific power, fast charge speed, long cycle life and high reliability, the super capacitor has become one of most important parts in the power system of the new energy automotives industry. Based on the virtues mentioned above, the super capacitor technology has realized the big scaled commercial application in pure electric city buses for a long-term with the feature of high power, fast charge speed, long service life, high reliability and small voltage and temperature discrepancies among cells. Its future practical application in pure electric traction vehicle with heavy-duty and hybrid automotives are also highlighted and hopeful.


Zhang X.,Shanghai Aowei Technology Development Co. | Hua L.,Shanghai Aowei Technology Development Co. | Yang E.,Shanghai Aowei Technology Development Co. | An Z.,Shanghai Aowei Technology Development Co. | And 6 more authors.
International Journal of Electrochemical Science | Year: 2012

In this paper, a simple and feasible method of making a coin-type Li-air battery (about 20mm in diameter and 28mm in height) was proposed. A special separator having function of air breathing and moisture prevention was adopted to act as a cover to let air breathe and prevent moisture invasion as well in cathode side. At the same time, a lithium ion conductive membrane was used between a Celgard membrane and a thin lithium foil to stop oxygen infiltrate into anode side. Compared with the prior art, electrochemical performance testing results showed that the cell had both better power performance and longer service life. © 2012 by ESG.


Patent
Shanghai Aowei Technology Development Co. | Date: 2013-01-02

A manufacturing method for a long-lived negative electrode and an organic hybrid type supercapacitor battery adopting the same. The manufacturing method for the negative electrode includes the following steps: mixing materials, which includes mixing a lithium fast storage carbon and a binder (3) with a solvent; pressing, which includes pressing the mixture into a sheet plate with a certain thickness by a roller press; coating, which includes preparing a slurry with a conductive agent (1) and coating the slurry onto a negative current collector (2); attaching, which includes attaching the sheet plate onto the negative current collector (2) coated with a layer of conductive agent (1) by pressing; preparing the negative electrode by drying, pressing, cutting and vacuum drying. With the process of preparing the sheet plate by pressing before attaching it onto the current collector, the negative electrode has a higher compaction density and cycle life. The manufactured organic hybrid type supercapacitor battery has characteristics with high energy density (up to 45-80Wh/Kg) and high power density (> 4500 W/Kg), and it can be widely used in electric vehicles, power tools, solar energy storage, wind energy storage, portable appliances and other fields.


Patent
Shanghai Aowei Technology Development Co. | Date: 2010-07-30

The present invention relates to a preparation method of a long cycle life negative electrode as well as the organic hybrid capacitor battery using this negative electrode. The preparation steps of the negative electrode include: blending all materials including carbon material with a fast lithium intercalation capability, and a binder, and adding in solvent; pressing the blended material to get an electrode plate of a certain thickness; stirring the conductive agent to a paste, and attaching it to a cathode current collector; attaching the electrode plate to the conductive agent coated negative current collector; Drying, grinding, cutting and vacuum drying to form a negative electrode. In the present invention, the process of pressing the electrode plate into shape first and then attaching to the negative current collector is used, which enables the negative electrode to have a high compressed density and cycle life. The organic hybrid super capacitor battery in the present invention has high energy density (up to 45-80 Wh/Kg), high power density (>4500 W/Kg), and can be widely used in electric vehicles, power tools, solar energy storage, wind energy storage, portable electric appliances and other fields.


Patent
Shanghai Aowei Technology Development Co. | Date: 2010-12-31

The present invention relates to an organic capacitor battery with high specific energy and high specific power. It is composed of an anode, a cathode, a separator in-between the cathode and anode, and an organic electrolyte. The characteristics of the capacitor battery are that the anode is a mixture of porous carbon materials with a lithium-ion intercalation compound, the cathode is hard carbon, and the electrolyte is an organic solvent electrolyte containing lithium ions. The super capacitor battery prepared according to this invention has high energy density (up to 20-90 W/Kg) and high power density (>4500 W/Kg, and it can be widely used in electric vehicles, power tools, solar energy storage, wind energy storage, portable appliances and other fields.


Patent
Shanghai Aowei Technology Development Co. | Date: 2013-01-02

A capacitor cell with a high-specific-energy organic system is provided. The capacitor cell consists of a positive electrode, a negative electrode, a separator interposed between the positive electrode and the negative electrode, and an organic electrolyte. The positive electrode comprises a mixture of lithium ion insertion compounds and porous carbon materials. The negative electrode is hard carbon. The electrolyte contains an organic solvent electrolyte containing lithium ions. The super capacitor cell has high energy density of 20-90 Wh/Kg and high power density of greater than 4500 W/Kg, which can be widely used in electric automobiles, electric tools, solar energy storage devices, wind energy storage devices and portable appliances.

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