六氟磷酸电解液在超级电容器中的电化学性能研究

Investigation on electrochemical properties of hexafluorophosphate in supercapacitors

采用一种具有潜在应用价值的1-乙基-3-甲基咪唑六氟磷酸盐作超级电容器的电解液,与活性炭电极组装成模拟超级电容器,与其他两种有机电解液进行循环伏安、恒流充放电、交流阻抗等电化学性能的比较。结果显示,1-乙基-3-甲基咪唑六氟磷酸酸盐(EMI-PF_6)在循环性能、恒流充放电及高电压放电等方面优于甲基三乙基铵六氟磷酸盐(N_(1,2,2,2)-PF_6)及N-甲基-N-乙基-吗啡啉六氟磷酸盐(N_(1,2)M-PF_6)。EMI-PF_6超级电容器具有良好的可逆性、循环特性及稳定的充放电性能,较适宜作为超级电的容器电解液。

The 1-ethyl-3-methyllimidazolium hexafluorophosphate with the potential application value was selected as supercapacitor electrolyte,and investigated in a symmetrical supercapacitor using activated carbon as electrodes.The electrochemical analysis of the simulated supercapacitor was examined using an AC impedance, a cyclic voltammetry,and constant current charging/discharging tests,meanwhile compared with the other two hexafluorophosphate.According to the results,the 1 - ethyl - 3 - methyllimidazolium hexafluorophosphate has the better electrochemical performance than Triethylmethylammonium hexafluorophosphate and N - methy - N - ethylMorpholine hexafluorophosphate by these electrochemical analysis.The supercapacitor also has better reversibility,cyclic characteristics and steady charging/discharging properties.