A comparative study of supercapacitor capacitance characterization methods.
A comparative study of supercapacitor capacitance characterization methods.
复制标题
超级电容器电容表征方法的比较研究。
DOI：
10.1016/j.est.2020.101316
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发表时间：
2020
影响因子：
9.4
通讯作者：
Yang,Hengzhao
中科院分区：
文献类型：
--
作者：
Yang,Hengzhao
本文比较了两种超级电容器电容测量方法：IEC标准62391-1的方法1A和利用超级电容器中存储的总电荷的方法。这两种方法被应用到三个超级电容器样品具有不同的额定容量，从不同的制造商在不同的端电压。实验结果表明，用IEC方法确定的电容随着放电电流的增加而减小。此外，使用IEC方法测量的电容低于使用总电荷法估计的电容。此外，当超级电容器端子电压较低时，使用总电荷方法估计的电容与使用IEC方法测量的电容的比率较大。通过分析捕获超级电容器物理学多个方面的五分支RCladder电路模型来解释使用这两种方法测量的电容的这三个观察结果：多孔电极结构，电容的电压依赖性，电荷重新分配和自放电。
This paper compares two supercapacitor capacitance measurement methods: the method 1A of the IEC standard 62391-1 and a method utilizing the total charge stored in the supercapacitor. These two methods are applied to three supercapacitor samples with different rated capacitances from different manufacturers at various terminal voltages. Experimental results show that the capacitance determined using the IEC method decreases when the discharge current increases. Besides, the capacitance measured using the IEC method is lower than that estimated using the total charge method. Moreover, the ratio of the capacitance estimated using the total charge method to the one measured using the IEC method is greater when the supercapacitor terminal voltage is lower. These three observations on the capacitances measured using the two methods are explained by analyzing a five-branchRCladder circuit model capturing multiple aspects of the supercapacitor physics: porous electrode structure, voltage dependence of capacitance, charge redistribution, and self-discharge.