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Lewis Acid‐Base Effects on Molecular Structure and Charge Density in Solid Polymer Electrolytes for Solid‐State Batteries

Researchers examined solid polymer electrolytes (SPEs) based on PVDF‑HFP incorporating LiFSI, LiTFSI, and a 1:1 binary mixture. They found that salt polarity and Lewis basicity dictate dehydrofluorination, crystallinity, and charge density, directly influencing ionic conductivity and mechanical robustness. The binary formulation delivered 4.93 × 10⁻⁴ S cm⁻¹ at 20 °C, 127 MPa tensile strength, and a widened electrochemical stability window. These results provide a clear pathway for engineering high‑performance SPEs for solid‑state batteries.