A Newly Designed Composite Gel Polymer Electrolyte Based on Poly(Vinylidene Fluoride‐Hexafluoropropylene) (PVDF‐HFP) for Enhanced Solid‐State Lithium‐Sulfur Batteries

Developing high‐performance solid‐state electrolytes is crucial for the innovation of next‐generation lithium‐sulfur batteries. Herein, a facile method for preparation of a novel gel polymer electrolyte (GPE) based on poly(vinylidene fluoride‐hexafluoropropylene) (PVDF‐HFP) is reported. Furthermore, Li 1.5 Al 0.5 Ti 1.5 (PO 4 ) 3 (LATP) nanoparticles as the active fillers are uniformly embedded into the GPE to form the final PVDF‐HFP/LATP composite gel polymer electrolyte (CPE). Impressively, the obtained CPE demonstrates a high lithium ion transference number of 0.51 and improved electrochemical stability as compared to commercial liquid electrolyte. In addition, the assembled solid‐sate Li−S battery with the composite gel polymer electrolyte membrane presents a high initial capacity of 918 mAh g −1 at 0.05 C, and better cycle performance than the counterparts with liquid electrolyte. Our designed PVDF‐HFP/LATP composite can be a promising electrolyte for next‐generation solid‐state batteries with high cycling stability.