期刊
JOURNAL OF POWER SOURCES
卷 152, 期 1, 页码 303-310出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2005.03.004
关键词
electrochemical double-layer capacitor; poly vinyl alcohol; polymer electrolyte; capacitance
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 Fg(-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 Fg(-1) after 1000 cycles. The findings suggest that the PVA-based SPE is a promising material for use in EDLCs. (c) 2005 Elsevier B.V. All rights reserved.
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