PERFORMANCE OF LITHIUM ION CAPACITORS USING AQUEOUS ELECTROLYTE AT HIGH TEMPERATURES
Aqueous lithium ion capacitors (DCs) with LiFePO4 positive electrodes and activated carbon (AC) negative electrodes were developed and their electrochemical performances were investigated by cyclic voltammetry, galvanostatic charge/discharge and ac impedance spectroscopy at various temperatures. It is found that the stable voltage window for the aqueous LICs is 0-1.7 V. The rate capability of the LIC is much higher than that of the LiFePO4 electrodes. The Ohmic resistance and electrochemical impedance of the LiFePO4 and AC electrodes decreases with increasing the temperature, leading to the high rate capability of the LICs. The capacity of the LICs gradually drops in 25 cycles and then keeps constant at 30 °C. The LICs still exhibit good cyclability at 50 °C, but the capacity of the LICs keep constant during 50 cycles and then gradually decay during further cycling test at 70 °C.
lithium ion capacitor supercapacitor cyclability specific capacity aqueous electrolyte
Jingwang Yan Yuanyuan Sun Ying Tian Rong Xue Lixing Hao Liang Jiang Wei Liu Baolian Yi
Dalian Institute of Chemical Physics, Chinese Academy of Sciences 457 Zhongshan Road, Dalian 116023, Dalian Institute of Chemical Physics, Chinese Academy of Sciences 457 Zhongshan Road, Dalian 116023, Dalian University of Technologies Linggong Road, Dalian 116024, China
国际会议
大连
英文
70
2012-05-28（万方平台首次上网日期，不代表论文的发表时间）