Sodium layered oxides are a class of materials characterized by their layered crystal structure, where sodium (Na) ions are intercalated between layers of metal oxides. The "layered" aspect refers to the stacking of alternating layers of sodium ions and transition metal oxides, which often results in a two-dimensional structure. Sodium layered oxides are of particular interest in the field of energy storage, particularly for use in sodium-ion batteries, due to their ability to reversibly intercalate and de-intercalate sodium ions during charge and discharge cycles. The properties of these materials, such as capacity, stability, and conductivity, can be tuned by varying the type of transition metal and the amount of sodium in the structure.

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