A high-performance solid-state polymer electrolyte for lithium-metal battery

Solid-state polymer electrolyte is a promising alternative to the flammable liquid electrolyte due to its improved safety. In this work, we develop a novel polymer electrolyte with fire-retardant property and excellent electrochemical performance. This fire-proof polymer electrolyte (FPE) demonstrates an outstanding ionic conductivity of 6.7 × [Formula: see text]S [Formula: see text] at [Formula: see text]C. The Li//FPE//Li symmetric cell using such FPE could stably charge/discharge for 500 h at a current density of 0.5 mA [Formula: see text] and an areal capacity of 0.5 mAh [Formula: see text]. The Li//FPE//LiFePO4 lithium-metal cell also presents a good cycling performance with a discharge capacity of 127.8 mAh [Formula: see text] after 450 cycles at 0.5 C.