Journal
ELECTROCHIMICA ACTA
Volume 55, Issue 23, Pages 7145-7151Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2010.06.085
Keywords
Ionic liquids; (Fluorosulfonyl)(pentafluoroethanesulfonyl)imide; Oniums; Lithium batteries
Categories
Funding
- National High Technology Research and Development Program of China [2007AA03Z246]
- National Natural Science Foundation of China [50873041]
- Key Laboratory of Organofluorine Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences
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New hydrophobic ionic liquids based on (fluorosulfonyl)(pentafluoroethanesulfonyl)imide ([(FSO2)(C2F5SO2)N](-), FPFSI-) anion with various oniums, including imidazolium, tetraalkyl ammonium, pyrrolidinium, and piperidinium, were prepared and characterized. Their physicochemical and electrochemical properties, including phase transitions, thermal stability, viscosity, density, specific conductivity and electrochemical windows, were extensively characterized, and were comparatively studied with the corresponding ionic liquids containing the isomeric but symmetric TFSI- ([(CF3SO2)(2)N](-)) anion. These new FPFSI--based ionic liquids display low melting points, low viscosities, good thermal stability, and wide electrochemical windows allowing Li deposition/dissolution. All these desired properties suggest they are potential electrolyte materials for Li (or Li-ion) batteries. (C) 2010 Elsevier Ltd. All rights reserved.
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