A ternary composite nanofiber-derived thin membrane electrolyte for solid-state Li metal batteries

Abstract

We develop novel membrane electrolytes comprising h-BN-doped poly(ethylene oxide) modified poly(vinylidene fluoride-co-hexafluoropropylene)-nanofibers (h-BN@PEO/PVH) with high ionic conductivity (3.3 × 10⁻⁴ S cm⁻¹) and Li⁺ transference number (0.74), endowing solid LiFePO₄//Li batteries with excellent cyclability over 1000 cycles at 60 °C. Our strategy surmounts the ionic conduction-interface stability trade-off and thin dimension-flexibility conflict.