CAJ | 학술논문

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%。
이2-구기필정(PySH )위양화환원활성개질,이취을희순(PVA)위취합물기체,채용용액공혼법제비료PVA-H2 SO4-PySH 응효전해질,연구료Py-SH 첨가량대응효전해질리자전도솔적영향,병조장료활성탄전겁초급전용기,이용순배복안、항류충방전、교류조항보화자방전등측시대초급전용기전화학성능진행료표정。결과표명,PySH 적인입제고료응효전해질적리자전도솔,동시야개선료초급전용기적전화학성능,재상동전류밀도하,초급전용기전겁비전용유137F/g 제고위394F/g,능량밀도유3.6Wh/kg제고도12.4Wh/kg,경과3000차충방전순배후비전용보지솔위89%。
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.