Interface Engineering Between Solid Electrolyte and Electrode for All-Solid-State Batteries

All-solid-state batteries (ASSBs) employing sulfide-based solid electrolytes with high ionic conductivity are considered the ultimate next-generation energy storage systems due to their enhanced safety and energy density, enabled by the utilization of metallic anodes. Lithium (Li) metal is regarded as a promising anode material for ASSBs owing to its high theoretical specific capacity (3860 mAh/g) and the lowest electrochemical potential (-3.04 V vs. standard hydrogen electrode). However, its practical application has been hindered by several interfacial issues, such as contact loss during cycling, which accelerates Li dendrite growth, and the chemical instability between Li and sulfide-based solid electrolytes. In this presentation, we will discuss the degradation mechanisms of ASSBs from both electrochemical and mechanical perspectives. Subsequently, we introduce our strategies to stabilize the Li metal and sulfide-based solid electrolyte interface.