Electrochemical stability of organic electrolytes in supercapacitors: Spectroscopy and gas analysis of decomposition products
作者： P. Kurzweil , M. Chwistek
DOI: 10.1016/J.JPOWSOUR.2007.08.070
关键词: Ionic liquid 、 Electrolysis 、 Electrolyte 、 Electrochemistry 、 Dielectric spectroscopy 、 Inorganic chemistry 、 Acetonitrile 、 Acetamide 、 Chemistry 、 Infrared spectroscopy
摘要: The fundamental aging mechanisms in double-layer capacitors based on alkylammonium electrolytes in acetonitrile were clarified for the first time. After abusive testing at cell voltages above 4V, ultracapacitors cast out a crystalline mass of residual electrolyte, organic acids, acetamide, aromatics, and polymer compounds. The mixture could be reproduced by electrolysis. The decomposition products of active carbon electrodes and electrolyte solution after a heat treatment at 70° C were identified by infrared and ultraviolet spectroscopy, liquid …
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