NaCoO2S

NaCoO₂S is a quaternary ceramic compound containing sodium, cobalt, oxygen, and sulfur—a mixed-anion oxide-sulfide material that exists primarily in research contexts rather than established commercial production. This material family is of interest for electrochemical applications, particularly as a potential cathode material or ion conductor in sodium-ion batteries and other energy storage systems, where the mixed anionic framework can enable unique ionic transport properties and electrochemical activity. Its development reflects ongoing efforts to find cobalt-based alternatives to traditional lithium-ion chemistries using earth-abundant sodium as the primary charge carrier.