A universal equivalent circuit for carbon-based supercapacitors
A universal equivalent circuit for carbon-based supercapacitors
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DOI：
10.1007/s10008-013-2328-4
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发表时间：
2014-05-01
影响因子：
2.5
通讯作者：
Kirkpatrick, Iain
中科院分区：
文献类型：
--
作者：
Fletcher, Stephen;Black, Victoria Jane;Kirkpatrick, Iain
提出了一种碳基超级电容器的通用等效电路。该电路实际上适用于所有具有非分支气孔的多孔电极，由单个垂直梯形网络与RC并联网络串联组成。这种优雅的布置解释了当今超级电容器的三个最重要的缺点，即开路电压衰减、高频下的电容损耗和高扫描速率下的伏安失真。它还解释了商业器件的复平面阻抗曲线的形状，并揭示了等效串联电容随温度增加的原因。最后介绍了固态超级电容模拟器的结构。这种装置是基于通用等效电路的截断版本，它允许实验人员探索不同超级电容器设计的响应，而不必修改真正的超级电容器。
A universal equivalent circuit is proposed for carbon-based supercapacitors. The circuit, which actually applies to all porous electrodes having non-branching pores, consists of a single vertical ladder network in series with an RC parallel network. This elegant arrangement explains the three most important shortcomings of present-day supercapacitors, namely open circuit voltage decay, capacitance loss at high frequency, and voltammetric distortion at high scan rate. It also explains the shape of the complex plane impedance plots of commercial devices and reveals why the equivalent series capacitance increases with temperature. Finally, the construction of a solid-state supercapacitor simulator is described. This device is based on a truncated version of the universal equivalent circuit, and it allows experimenters to explore the responses of different supercapacitor designs without having to modify real supercapacitors.