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ISSN 1000-6818CN 11-1892/O6CODEN WHXUEU
Acta Phys Chim Sin >> 2012,Vol.28>> Issue(02)>> 367-372     doi: 10.3866/PKU.WHXB201112131         中文摘要
ELECTROCHEMISTRY AND NEW ENERGY
Activated Carbon-Based Supercapacitors Using Li2SO4 Aqueous Electrolyte
SUN Xian-Zhong, ZHANG Xiong, ZHANG Da-Cheng, MA Yan-Wei
Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100190, P. R. China
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In this work, we prepared activated carbon-based symmetric supercapacitors using Li2SO4 aqueous electrolyte instead of H2SO4 and KOH, and obtained devices with an improved working voltage of 1.6 V from 1.0 V. Cyclic voltammetry and galvanostatic charging/discharging measurements were used to study the electrochemical properties. The results showed that the electrode specific capacitance can reach 129 F·g-1, and the energy density can be as high as 10 Wh·kg-1 at a power density of 160 Wh·kg-1. Electrochemical impedance analysis measurements showed that the charge-transfer resistance of the capacitors decreased markedly with the increase of the concentration of Li2SO4, and the rate capability improved accordingly. The leakage current of the supercapacitor was 0.22 mA after constant-voltage charging at 1.6 V for 1 h, and the columbic efficiency was nearly 100%. The capacitance of the supercapacitor remained above 90% after 5000 charge-discharge cycles. Activated carbon-based supercapacitors using Li2SO4 aqueous electrolyte have many advantages, such as high working voltage, high energy density, and environmental compatibility, and therefore have good industrialization prospects.

Keywords: Supercapacitor   Activated carbon   Neutral aqueous electrolyte   Li2SO4  
Received: 2011-10-11 Accepted: 2011-12-07 Publication Date (Web): 2011-12-13
Corresponding Authors: MA Yan-Wei Email: ywma@mail.iee.ac.cn

Fund: The project was supported by the Knowledge Innovation Program of the Chinese Academy of Sciences (KJCX2-YW-W26), Science and Technology Project of Beijing, China (Z111100056011007), and National Natural Science Foundation of China (21001103, 51025726).

Cite this article: SUN Xian-Zhong, ZHANG Xiong, ZHANG Da-Cheng, MA Yan-Wei. Activated Carbon-Based Supercapacitors Using Li2SO4 Aqueous Electrolyte[J]. Acta Phys. -Chim. Sin., 2012,28 (02): 367-372.    doi: 10.3866/PKU.WHXB201112131
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