Preparation and characterization of imidazolium-PEO-based Ionene/PVDF(HFP)/LiTFSI as a novel Gel polymer electrolyte

Abstract

The synthesis and properties of a solvent-free gel polymer electrolyte based on an imidazolium-poly(ethylene oxide) (PEO)-based ionene electrolyte, a poly(vinylidene fluoride-hexafluoropropylene) (PVDF(HFP)) support, and the lithium bis(trifluoromethane sulfonyl) imide (LiTFSI) salt are reported. A ternary gel polymer electrolyte film, produced from mixtures of the imidazolium-PEO-based ionene ([IPI][Br]), PVDF(HFP), and LiTFSI, displayed good thermal and mechanical stability. A very high room temperature conductivity of 2.6×10-3 S/cm and a broad electrochemical stability window were obtained, demonstrating the utility of the electrolyte for practical Li-ion battery applications.