期刊
JOURNAL OF POWER SOURCES
卷 138, 期 1-2, 页码 240-244出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2004.06.022
关键词
ionic liquid; lithium battery; cyano group
A room temperature ionic liquid consisting of NNNN-cyanomethyl trimethyl ammonium (CTMA) cation and bis(trifluoromethane sulfone)imide (TFSI) anion was newly synthesized, and its electrochemical properties were investigated. This ionic liquid has a melting point of 35 degreesC and an order of conductivity of 10(-4) S Cm-1. Lithium deposition/dissolution tests in 0.2 mol dm(-3) LiTFSI/CTMATFSI electrolytes showed an improved cycle behavior compared with that of a Li electrolyte based on a tetraalkylammonium ionic liquid without a cyano group. It is suggested that such an improvement may be associated with the formation of a protective film on the lithium surface. Introducing a proper functional group is suggested to be effective to improve the interfacial properties of ionic liquid. (C) 2004 Elsevier B.V. All rights reserved.
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