Na5 Co2 S5

Na5Co2S5 is a mixed-valence sodium cobalt sulfide compound belonging to the quaternary sulfide semiconductor family, composed of sodium, cobalt, and sulfur elements in a layered or framework crystal structure. This material is primarily of research and development interest for energy storage and photovoltaic applications, particularly in emerging battery chemistries and thin-film solar devices where layered sulfides offer potential advantages in ion conductivity and charge transport. As a cobalt-containing sulfide semiconductor, it represents an alternative to conventional cathode materials and represents active investigation in materials science rather than established industrial production.