期刊
ELECTROCHIMICA ACTA
卷 52, 期 3, 页码 1398-1408出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2006.07.043
关键词
polymer gel electrolyte; ionic liquids; glassy carbon; lithium-ion batteries; 2-ethoxyethyl methacrylate
New polymer gel electrolytes containing ionic liquids were developed for modern chemical power sources-supercapacitors and lithium-ion batteries. Ternary systems polymer-ionic liquid-aprotic solvent as well as materials containing also lithium salts (LiClO4 or LiPF6) were prepared by direct, thermally initiated polymerisation. Poly(2-ethoxyethyl methacrylate) PEOEMA was combined with various ionic liquids based on 1-methylimidazole. Only 1-butyl-3-methylimidazolium hexafluorophosphate BMIPF6 formed a homogenous and slightly translucent polymer electrolyte, where aprotic solvents-propylene carbonate and ethylene carbonates were used as plasticisers. Materials were studied using the electrochemical and thermogravimetric methods and exhibit high ionic conductivity up to 0.94 mS cm(-1) at 25 degrees C together with high electrochemical stability: the accessible potential window on the glassy carbon was found ca. 4.3 V. Prepared non-volatile materials are long-term and thermally stable up to 150 degrees C. (c) 2006 Elsevier Ltd. All rights reserved.
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