Multicomponent Quasi-Solid-State\nPolymer Electrolyte\nIncorporating MOFs and Halloysite Nanotubes for Enhanced Sodium Metal\nBattery Performance

Solid-state sodium metal batteries are among the most\npromising\nnext-generation energy storage devices. However, developing competent\nsolid-state electrolytes for these batteries remains a significant\nchallenge. Herein, we introduce a design for a quasi-solid-state polymer\nelectrolyte that enhances sodium metal battery performance. This multicomponent\nquasi-solid-state polymer electrolyte, designated PH-MSN-HNT, was\nsynthesized by incorporating modified MOF particles and halloysite\nnanotubes (HNTs) into a PVDF-HFP (PH) polymer matrix. Due to the synergistic\neffects of these components, PH-MSN-HNT exhibits superior sodium ion\nconductivity (>10<sup>–3</sup> S cm<sup>–1</sup>)\nat\nroom temperature, a high Na<sup>+</sup> transference number (0.79),\nand a wide electrochemical stability window (5.16 V). Furthermore,\nPH-MSN-HNT was used as an electrolyte to assemble sodium metal batteries,\nwhich demonstrate efficient sodium dendrite suppression and remarkable\ncycling performance with 98% capacity retention (108.6 mAh g<sup>–1</sup> at 0.1 C) after 100 charge/discharge cycles over 1000 h.