Gel Polymer Electrolytes Based on Polymerizable Lithium Salt and Poly(ethylene glycol) for Lithium Battery Applications

摘要

Here, a polymerizable lithium salt, lithium (trifluoromethanesulfonyl)(vinylsulfonyl)imide, was synthesized and used to prepare cross-linked gel polymer electrolyte systems with poly(ethylene glycol) methyl ether methacrylate as an ion conducting moiety, poly(ethylene glycol) dimethacrylate as a cross-linker, and propylene carbonate as a liquid electrolyte without adding any conventional inorganic lithium salt. The gel polymer electrolytes prepared in this study exhibited a reasonably high ionic conductivity (6.7 x 10(-4) S cm(-1) at 25 degrees C and 1.8 X 10(-3) S cm(-1) at 60 degrees C) and lithium-ion transference number (0.52), and the lithium battery prepared using the gel polymer electrolyte showed a stable cycling performance over 50 cycles.