Li2 S4 Sm2

Li₂S₄Sm₂ is a rare-earth-doped lithium sulfide compound belonging to the semiconductor class, combining lithium sulfide chemistry with samarium doping to modify electronic and ionic properties. This is a research-phase material primarily investigated for solid-state electrolyte and ionic conductor applications in advanced battery systems, where the rare-earth dopant enhances lithium-ion transport and structural stability compared to undoped lithium sulfide variants. Its significance lies in potential use as a solid electrolyte material for next-generation all-solid-state lithium batteries, offering improved safety and energy density over liquid electrolytes, though it remains largely in development stages outside specialized research environments.