FeLiO2S

FeLiO₂S is an iron-lithium oxide sulfide ceramic compound that combines iron, lithium, oxygen, and sulfur phases. This material exists primarily in research and experimental contexts as a potential solid electrolyte or mixed-ionic/electronic conductor, rather than as an established commercial ceramic. The compound's relevance lies in energy storage and electrochemical device applications, where the combination of lithium and iron species could enable ion transport while maintaining some electronic conductivity—properties valuable for next-generation battery separators, fuel cell electrolytes, or cathode materials; however, its practical deployment remains limited compared to more mature ceramic electrolytes.