Journal of Energy Storage ( IF 9.4 ) Pub Date : 2021-09-16 , DOI: 10.1016/j.est.2021.103156 A.P.R. Fernandez 1 , E.A. Périgo 2 , R.N. Faria 1
Distinctly from ordinary capacitors which have a fixed capacitance, the capacitance of electrochemical supercapacitors is dependent on the applied potential. This feature introduces an additional complication to the analytical solution representing the supercapacitor circuit. Here a simplified equivalent circuit of electric double layer capacitors or electrochemical supercapacitors is proposed so that expressions evaluating the potential-dependent capacitance are derived considering short periods of charging and discharging process as in cyclic voltammetry carried out in a few minutes. Comparisons between such theoretical development and experimental cyclic voltammetry data – presenting a very good agreement – are presented and discussed.
中文翻译:
具有电位相关电容的电化学超级电容器的解析表达式
与具有固定电容的普通电容器不同,电化学超级电容器的电容取决于施加的电位。此特征为表示超级电容器电路的解析解引入了额外的复杂性。这里提出了一种简化的双电层电容器或电化学超级电容器的等效电路,以便在几分钟内进行循环伏安法时,考虑到短周期的充电和放电过程,推导出评估电势相关电容的表达式。介绍并讨论了这种理论发展与实验循环伏安法数据之间的比较——表现出非常好的一致性。