Na12 Ni2 O8

Na₁₂Ni₂O₈ is a mixed-valence nickel oxide compound with a layered crystal structure, belonging to the family of ternary sodium-nickel oxides used primarily in electrochemical and energy storage research. This material is of particular interest in battery and supercapacitor development, where its structural framework and redox-active nickel centers enable ion transport and charge storage; it remains largely a research-phase compound rather than a mature commercial material, but represents the broader class of sodium-ion conductors and transition metal oxides being explored as alternatives to lithium-based systems for cost-sensitive, high-volume energy applications.