Journal
JOURNAL OF POWER SOURCES
Volume 186, Issue 2, Pages 490-495Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2008.10.036
Keywords
Ionic liquids; Polymer electrolytes; Lithium; Batteries
Funding
- European Commission, Erasmus Munclus program
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New types of dimensionally stable, flexible gel-type electrolyte membranes with a relatively wide electrochemical stability, high lithium ion conductivity and other desirable properties have been prepared by immobilizing N-n-butyl-N-ethylpyrrolidinium N,N-bis(trifluoromethane)sulfonimide-lithium N,N-bis(trifluoromethane)sulfonimide (PY24TFSI-LiTFSI), ionic liquid, IL, solutions in a poly(vinylidene fluoride)-hexafluoropropylene copolymer (PVdF-HFP) matrix. The addition of a discrete amount of ethylene and propylene carbonate (EC-PC), solvent mixture to the membranes resulted in an improvement of the ionic conductivity and in a stabilization of the interface with the lithium electrode. These IL-based gel type membranes can operate without degradation up to a temperature of 110 degrees C where they reach conductivity values of the order of 10(-2) S cm(-1). All these properties make these polymer electrolyte membranes of interest for applications as separators in advanced lithium batteries. (c) 2008 Elsevier B.V. All rights reserved.
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