聚乙烯醇
电容
材料科学
电解质
电容器
双电层电容器
聚合物
循环伏安法
分离器(采油)
介电谱
电解电容器
电化学
聚合物电容器
分析化学(期刊)
化学工程
复合材料
电极
化学
电气工程
电压
色谱法
物理
物理化学
热力学
工程类
作者
Chun‐Chen Yang,Sung-Ting Hsu,Wen-Chen Chien
标识
DOI:10.1016/j.jpowsour.2005.03.004
摘要
Solid-state electrochemical double-layer capacitors (ELDCs) based on alkaline polyvinyl alcohol (PVA) solid polymer electrolytes (SPEs) are prepared. Electrochemical capacitance performance of these capacitors is studied by cyclic voltammetry, galvanostatic charge–discharge testing, and ac impedance spectroscopy. For comparison, two types of EDLC cells are constructed and tested. It is found that an EDLC with a PVA polymer electrolyte exhibits much higher capacitance and longer cycle-life than one with the PP/PE separator. The specific capacitance for the EDLC with the PVA-based SPE is in the range of 100–112 F g−1, and depends on the scan rate or the charge–discharge current rates. The results also indicate that the solid-state EDLC shows a relatively stable specific capacitance of 100 F g−1 after 1000 cycles. The findings suggest that the PVA-based SPE is a promising material for use in EDLCs.
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