Capacitive matching of pore size and ion size in the negative and positive electrodes for supercapacitors
Capacitive matching of pore size and ion size in the negative and positive electrodes for supercapacitors
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超级电容器正负极孔径和离子尺寸的电容匹配
DOI：
10.1016/j.electacta.2011.07.139
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发表时间：
2011-10
影响因子：
6.6
通讯作者：
Wenhua Song
中科院分区：
文献类型：
--
作者：
Donghui Long;Xiaojun Liu;Licheng Ling;Gangwei Sun;Wenming Qiao;Wenhua Song
使用三种电池配置研究了不同孔结构的活性炭在碳酸丙烯酯（PC）中的Bu4NBF4和Et4NBF4两种电解质中的电容行为。研究了正负极上吸附离子尺寸和孔径之间的相关性。孔径和阳离子尺寸的匹配在电容器单元中更为重要，特别是对于孔隙度不太发达的电极材料。对于孔隙率较低的电极材料，负极中的 7Fg−1 和正极中的 113Fg−1 的电容分布不对称。这可能归因于负极表面被电解质离子饱和，限制了器件的整体电容和工作电压。然而，由于离子和孔壁之间的相互作用减弱，非常发达的孔隙不能从表面积的充分统一中获益。随着孔体积的增加，比表面积电容从11.3显着降低到6.7μFcm−2。由于负极和正极上不同的电解质离子需要不同的孔径，因此为了获得电容器单元的最大电容值，应考虑每个电极的孔径和离子尺寸之间的最佳匹配。
The capacitive behavior of activated carbons with different pore structures in two kinds of electrolytes, Bu4NBF4and Et4NBF4in propylene carbonate (PC) was studied using three kinds of cell configuration. The correlations between adsorbed ion size and pore size on the positive and negative electrodes were investigated. The matching of pore size and cation size was more predominant in the capacitor unit, especially for the electrode materials with less developed porosity. The asymmetric capacitance distribution of 7Fg−1in the negative electrode and 113Fg−1in the positive electrode occurred for electrode materials with less developed porosity. This could be ascribed to the surface saturation of the negative electrode by electrolyte ions, limiting the overall capacitance and working voltage of device. However, very developed porosity could not profit from the sufficient unitization of surface area, due to a weakened interaction between ions and pores wall. The specific area capacitance experienced a significant decrease from 11.3 to 6.7μFcm−2with the pore volume increasing. Since the different pore sizes were required for different electrolytes ion on the negative and positive electrodes, the optimal matching between pores size and ions dimension with respect to each electrode should be considered for the maximum capacitance value of the capacitor unit.
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作者：
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通讯作者：
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作者：
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通讯作者：
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作者：
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