Single-step ball milling synthesis of highly Li+ conductive Li5.3PS4.3ClBr0.7 glass ceramic electrolyte enables low-impedance all-solid-state batteries

Abstract

A single-step high-energy ball milling process was used for the synthesis of a Li_5.3PS_4.3ClBr_0.7 glass ceramic. This material exhibits a Li⁺ conductivity of 5.2 mS cm⁻¹, the highest value reported so far at room temperature for a Li⁺ solid electrolyte pellet prepared without any annealing step. We demonstrate the utilization of this electrolyte in an all-solid-state battery exhibiting a composite cathode impedance of only 5 Ω cm² at room temperature.