Polymer Electrolytes Based on Ionic Liquids and Their Application to Solid-state Thin-film Li-Oxygen Batteries

摘要

Ionic liquids that are non-volatile, non-flammable, and stable with Li metal and exhibit wide electrochemical stability window are promising for application to lithium batteries, including Li/air cells. 1-Methyl-3-Propylpyrrolidinium bis(trifluoromethanesulfonyl)imide (P{sub}13TFSI) is identified to be such an ionic liquid. Dimensionally stable, elastic polymer electrolyte membranes with high thermal and electrochemical stability, high ionic conductivity and other desirable properties are synthesized by blending P{sub}13TFSI with lithium imide salt dissolved in it and the PVDF-HFP co-polymer. Preliminary solid-state, thin-film Li-oxygen cells are constructed using the polymer electrolyte membranes and their performance analyzed.