Performance Improvement of Argyrodite Solid Electrolyte for All-Solid-State Battery Using Wet Process

All-solid-state batteries (ASSBs) have been identified as a promising solution for electric vehicle applications, and the argyrodite Li6PS5Cl solid electrolyte stands out as one of the most promising candidates due to its high ionic conductivity at room temperature. However, wet processes for solid electrolyte synthesis have shown lower ionic conductivities than dry processes due to residual solvents. In this study, we have investigated the optimization of a wet process through sediment separation and supernatant removal to produce high-performance solid electrolytes for ASSB applications. Consequently, the solid electrolyte, synthesized by separating the precipitate and removing the supernatant after high-energy ball milling, exhibited high ionic conductivity and good Li metal compatibility at room temperature. These findings suggest the possibility of producing high-performance solid electrolytes for ASSB applications.