Studies on the equivalent serial resistance of carbon supercapacitor
Studies on the equivalent serial resistance of carbon supercapacitor
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碳超级电容器等效串联电阻的研究
DOI：
10.1016/j.electacta.2015.06.008
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发表时间：
2015-08-20
影响因子：
6.6
通讯作者：
Yang, Chang-Ping
中科院分区：
文献类型：
--
作者：
Li, Kai-Bing;Shi, Da-Wei;Yang, Chang-Ping
等效串联电阻（ESR）是影响超级电容器功率密度和能量密度的重要因素。本文研究了机械压力、温度、电解液浓度和负载电压等内外因素对碳超级电容器性能参数的影响，特别是对碳超级电容器的ESR和比电容的影响。结果表明，ESR主要来自电解质与电极的界面。此外，我们发现ESR可以通过机械压力从ON时的11欧姆显著降低到800 N时的1欧姆，降低90%，因此，超级电容器的比电容可以从19.34 F/g显著提高到44.87 F/g，增加128%。基于界面扩散层模型，对ESR和比容随压力、温度、电解质浓度和加载电压四个因素的变化规律提出了合理的解释。(C)2015由Elsevier Ltd.出版
Equivalent serial resistance (ESR) is a crucial factor to effect on the density of power and energy for supercapacitor. In this work, we studied the influence of internal and external factors, including mechanical pressure, temperature, electrolyte concentration and loaded voltage on the performance parameters, especially on the ESR and specific capacitance for carbon supercapacitor. The results indicate that the ESR is mainly contributed from the interface between electrolyte and electrode. In addition, we found that the ESR can be significantly lowered by mechanical pressures from 11 ohm at ON to 1 ohm at 800 N by decreasing 90%, and in consequence, the specific capacitance of supercapacitor can be improved dramatically from 19.34 F/g to 44.87 F/g by increasing 128%. Basing on the model of interface with a diffusion layer, we put forward a reasonable explanation for the variation of ESR and specific capacitance with the four factors of pressure, temperature, electrolyte concentration and loaded voltage. (C) 2015 Published by Elsevier Ltd.