Coating materials and processes for cathodes in sulfide-based all solid-state batteries

Abstract

This short review focuses on critical issues of cathode–solid electrolyte (SE) interface, including chemical instability, space-charge layer, and mechanical failure for all solid-state batteries (SSBs). Moreover, we reviewed recent R&D efforts to solve the issues by passivating the cathode interfaces using various materials (e.g. metallic oxides, carbonates, phosphates, halides, and polymers) and coating processes (e.g. sol-gel, dry coating, and atomic layer deposition). Finally, future perspectives have been outlined to understand fundamental electro-chemo-mechanical reactions occurring through coating layers to improve the performances of SSBs in the future.