以2-巯基吡啶(PySH )为氧化还原活性介质,以聚乙烯醇(PVA)为聚合物基体,采用溶液共混法制备了PVA-H2 SO4-PySH 凝胶电解质,研究了Py-SH 添加量对凝胶电解质离子电导率的影响,并组装了活性炭电极超级电容器,利用循环伏安、恒流充放电、交流阻抗谱和自放电等测试对超级电容器电化学性能进行了表征。结果表明,PySH 的引入提高了凝胶电解质的离子电导率,同时也改善了超级电容器的电化学性能,在相同电流密度下,超级电容器电极比电容由137F/g 提高为394F/g,能量密度由3.6Wh/kg提高到12.4Wh/kg,经过3000次充放电循环后比电容保持率为89%。
In this paper,a gel polymer electrolyte (GPE)polyvinyl alcohol-sulphuric acid-2-mercaptopyridine (PVA-H2 SO4-PySH)was prepared by solution mixing method using PySH as a redox mediator and PVA as a polymer host.The effect of the added amount of PySH on the ionic conductivity of GPE was investigated.The electrochemical properties of the supercapacitor with the prepared gel polymer electrolyte and activated carbon electrodes were evaluated by cyclic voltammetry,galvanostatic charge-discharge,electrochemical impedance spectroscopy and self-discharge measurements.The results indicate that the ionic conductivity of GPE and the electrochemical properties of the supercapacitor were improved by introducing PySH.At the same current den-sity,the electrode specific capacitance and energy density of the supercapacitor increase from 137 to 394F/g and 3.6 to 12.4Wh/kg,respectively.In addition,the capacitive retention ratio of the supercapacitor still retains 89% over 3000 charge-discharge cycles.
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