Effects of Supercapacitor Physics on Its Charge Capacity
Effects of Supercapacitor Physics on Its Charge Capacity
复制标题
DOI：
10.1109/tpel.2018.2812882
复制
发表时间：
2019-01-01
影响因子：
6.7
通讯作者：
Yang, Hengzhao
中科院分区：
文献类型：
--
作者：
Yang, Hengzhao
本文研究了超级电容器的多孔电极结构、电荷再分布和自放电三个方面的物理特性对其充电容量的影响。所提供的电荷和放电电流之间的关系进行检查的上限和下限的利用充电容量，这是指在恒流放电过程中提供的电荷量。在上限情况下，Peukert定律在放电电流高于某个阈值时适用，并且如果放电电流低于阈值则不再适用。在下限情况下，如果放电电流高于特定阈值，则当放电电流减小时，输送的电荷增加，尽管与上限情况相比，增加率较低。研究了这三种超级电容器机制的单独和组合效应。当施加较小的放电电流时，多孔电极结构和电荷再分布过程导致所递送的电荷增加。当放电电流相对较大时，自放电的影响可以忽略不计。如果放电电流足够小，则自放电导致显著的能量损失，并因此导致所输送电荷的下降。
This paper investigates the effects of three aspects of the supercapacitor physics on its charge capacity: porous electrode structure, charge redistribution, and self-discharge. The relationship between the delivered charge and the discharge current is examined for both the upper and lower bounds of the utilized charge capacity, which refers to the amount of charge delivered during a constant-current discharge process. In the upper bound case, Peukert's law applies when the discharge current is above a certain threshold and does not apply anymore if the discharge current is below the threshold. In the lower bound case, if the discharge current is above a specific threshold, the delivered charge increases when the discharge current decreases although the increase rate is lower compared to that in the upper bound case. The individual and combined effects of the three supercapacitor mechanisms are studied. The porous electrode structure and the charge redistribution process result in an increase in the delivered charge when a smaller discharge current is applied. The impact of self-discharge is negligible when the discharge current is relatively large. If the discharge current is sufficiently small, self-discharge results in a significant energy loss and consequently a drop in the delivered charge.