Advanced Gel Polymer Electrolytes with Semi-Interpenetrating Polymer Network for High Ionic Conductivity and Mechanical Strength
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In this work, we developed gel polymer electrolytes (GPEs) by casting a solution of poly(ethylene glycol) methyl ether methacrylate (PEGMA), trimethylolpropane ethoxylate triacrylate (ETPTA), and poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP), which then underwent thermal radical polymerization. The resultant GPEs exhibit a semi-interpenetrating polymer network (SIPN) structure, ensuring substantial film durability. This has been evidenced by morphological, structural, and electrochemical assessments. We formulated a GPE with a mixture of 98 mol% PEGMA, 2 mol% ETPTA, and a 40 wt% presence of PVDF-HFP (based on the total weight of PEGMA and ETPTA), which demonstrated significant ionic conductivity and tensile strength. Further, we confirmed the electrochemical stability of the GPE up to 4.7 V (vs. Li/L+), underlining its immense potential as a polymer electrolyte membrane in energy storage applications.