物理化学学报 >> 2011, Vol. 27 >> Issue (02): 479-485.doi: 10.3866/PKU.WHXB20110221

电化学和新能源 上一篇    下一篇

电解质浓度和温度对活性炭电容性能的影响

田颖1,2, 阎景旺1, 薛荣1, 衣宝廉1   

  1. 1. 中国科学院大连化学物理研究所, 辽宁 大连 116023;
    2. 大连交通大学环境与化学工程学院, 辽宁 大连 116028
  • 收稿日期:2010-08-24 修回日期:2010-11-17 发布日期:2011-01-25
  • 通讯作者: 阎景旺 E-mail:yanjw@dicp.ac.cn
  • 基金资助:

    中国科学院大连化学物理研究所重要方向性项目“电动汽车用超级电容器储能系统的研究与开发”资助

Influence of Electrolyte Concentration and Temperature on the Capacitance of Activated Carbon

TIAN Ying1,2, YAN Jing-Wang1, XUE Rong1, YI Bao-Lian1   

  1. 1. Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning Province, P. R. China;
    2. College of Environmental and Chemical Engineering, Dalian Jiaotong University, Dalian 116028, Liaoning Province, P. R. China
  • Received:2010-08-24 Revised:2010-11-17 Published:2011-01-25
  • Contact: YAN Jing-Wang E-mail:yanjw@dicp.ac.cn
  • Supported by:

    The project was supported by the Important Directional Project of ‘The Research and Exploration of Supercapacitor Storage System for Electric Vehicle’ from Dalian Institute of Chemical Physics, Chinese Academy of Sciences, China.

摘要:

采用循环伏安、交流阻抗和恒流充放电技术考察了电解质浓度和温度对活性炭电容性能的影响. 活性炭电容器在0.1、0.5、1.0和6.0 mol·L-1 KOH溶液中性能测试结果表明: 活性炭在高浓度电解质中具有高电容和低内阻, 但电位窗口较窄; 电容和内阻与KOH浓度的对数成正比. 活性炭电容在不同温度(20、40、80 °C)的性能测试结果表明: 高温能够增加电容和降低内阻, 但是却加速了长期充放电过程中电容的衰减.

关键词: 超级电容器, 活性炭, 电解质浓度, 温度

Abstract:

The influences of electrolyte concentration and temperature on the capacitive behavior of activated carbon (AC) were investigated by cyclic voltammetry, electrochemical impedance spectroscopy, and galvanostatic charge/discharge measurements. The performance of a symmetric capacitor was characterized in 0.1, 0.5, 1.0, and 6.0 mol·L-1 KOH solution. We found that the high electrolyte concentration led to high capacitance, low internal resistance, and a narrow voltage window. The capacitance and internal resistance were found to be linearly dependent on the logarithm of KOH concentration. AC supercapacitor performance was investigated at 20, 40 and 80 °C, respectively. We found that elevated temperatures are favorable for an increase in capacitance and for a decrease in internal resistance. However, elevated temperatures increase the capacitance fading rate during long charge/discharge cycling tests.

Key words: Supercapacitor, Activated carbon, Electrolyte concentration, Temperature

MSC2000: 

  • O646