Abstract
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 (Py 24TFSI-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 °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.
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