Modelling the effects of charge redistribution during self-discharge of supercapacitors
Modelling the effects of charge redistribution during self-discharge of supercapacitors
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DOI：
10.1016/j.electacta.2010.01.002
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发表时间：
2010-10-30
影响因子：
6.6
通讯作者：
Sauer, Dirk Uwe
中科院分区：
文献类型：
--
作者：
Kaus, Maximilian;Kowal, Julia;Sauer, Dirk Uwe
最近的一项研究表明，自放电的过程是由许多参数，如初始电压，温度和充电时间。根据这些参数，我们观察到充电后48小时内电压衰减5-15%。这些观察结果几乎不会影响超级电容器的动态操作，但对所有静态设置都有重大影响。已经建立了一个复杂的电气模型来解释发生在超级电容器中的离子的再分布效应。密集的实验研究表明，这些再分配效应是测量到的潜在衰变的部分原因。延长的充电允许离子在整个孔中更均匀地分配它们自己，并且因此在充电之后的休息时间段期间的电压衰减大大降低。所介绍的模型是能够预测充电持续时间，初始电压，和温度上的开路电压衰减的影响。(C)2010爱思唯尔有限公司版权所有。
A recent study has shown that the process of self-discharge is determined by a number of parameters such as initial voltage, temperature, and charge duration. Depending on these parameters we observed a voltage decay of 5-15% within 48 h after charging. These observations hardly affect dynamic operations for supercapacitors, but have major implications for all static setups. A complex electrical model has been established to account for the redistribution effects of ions occurring in supercapacitors. Intense experimental studies suggest that these redistribution effects are in part responsible for the measured potential decays. Extended charging allows the ions to allocate themselves more homogeneously throughout the pores and therefore the voltage decay during the rest period following the charging is greatly reduced. The introduced model is capable of predicting the effects of charge duration, initial voltage, and temperature on the open circuit voltage decay. (C) 2010 Elsevier Ltd. All rights reserved.