Chloride ion conducting polymer electrolytes based on cross-linked PMMA-PP 14 Cl-PP 14 TFSI ion gels for chloride ion batteries

Abstract

Chloride ion conducting polymer electrolytes based on cross-linked ion gels for chloride ion batteries were prepared by in-situ photo induced copolymerization of methyl methacrylate (MMA) and ethylene glycol dimethacrylate cross-linker (EGDMA) in the presence of ionic liquid mixture, 0.5 M 1-butyl-1-methylpiperidinium chloride (PP 14 Cl) in 1-butyl-1-methylpiperidinium bis-(trifluoromethylsulfonyl)imide (PP14TFSI). The as-prepared ion gel membranes with 80 wt% chloride containing ionic liquid mixture are self-standing, flexible and transparent with superior thermal (up to about 340 °C) and electrochemical stability (5.0 V vs. SS/SS). The ionic conductivity of chloride ion conducting IL-based gel polymer electrolytes (IL-GPEs) reached 0.9 × 10 -4 S cm -1 with 80 wt% ionic liquid mixture at 25 °C. Preliminary charge and discharge testing has demonstrated the feasibility of using chloride ion conducting IL-GPEs for chloride ion batteries.