PEO-LIKE POLYMER ELECTROLYTES WITH HIGH ROOM-TEMPERATURE CONDUCTIVITY

Polymer electrolytes with room temperature conductivities of >10(-4) S /cm were prepared by encapsulating solutions of LiN(SO2CF3)(2) (or LiS O3CF3 or LiPF6) in oligomeric poly(ethylene glycol) dimethyl ethers in a poly(vinylidene fluoride)-hexafluoropropene copolymer. The 100 to 2 00 mu m thick membranes prepared have good mechanical strength and are ''dry'' with practically no volatility at least up to 70 degrees C. B ecause of these properties and the structural similarities between pol y(ethylene glycol) dimethyl ethers (PEGDME) and polyethylene oxide (PE O) we call them PEO-like.