ASSBs, in particular, are considered promising candidates for high-energy-density batteries, addressing the growing demand in the electric vehicle market as conventional lithium-ion batteries (LIBs) approach the theoretical limit . Solid oxide fuel cells (SOFCs), another important application, can also benefit from the utilization of solid-fast ion conductors. Operating at elevated temperatures, SOFCs require stable and efficient materials to ensure optimal performance. By replacing liquid or polymer electrolytes with solid-fast ion conductors, the limitations associated with lower stability and efficiency can be overcome.