Low‐Cost Raw Materials Synthesized Na2.9375PS3.9375Cl0.0625 Solid Electrolyte

Na3PS4‐based materials, which have relatively high conductivities, make promising Na‐ion solid electrolytes for realizing all‐solid‐state sodium batteries. Herein, Na2.9375PS3.9375Cl0.0625 solid electrolytes’ power is prepared by a mechanical ball milling process and subsequent heat treatment process using low‐cost Na, NaCl, P2S5, and S as raw materials. In addition, its electrical conductivity and electrochemical performance by compounding with polyethylene oxide–NaClO4 are studied. The results show that Na2.9375PS3.9375Cl0.0625 solid electrolyte heated at 550 °C with polyethylene oxide–NaClO4 exhibits Na‐ion conductivity of 8.75 × 10−4 S cm−1. The pragmatic and cost‐effective raw materials grant the solid electrolyte with high‐performance and higher practical value.