Layered oxide positive electrode doped with elements on sodium layer and application of layered oxide positive electrode and sodium ion battery

The invention relates to the field of sodium-ion battery positive electrode materials, and discloses a layered oxide positive electrode doped with elements in a sodium layer and application of a sodium-ion battery. The chemical formula of the positive electrode material comprises [Na1-3xYx] TMO2, the rare earth element yttrium (Y) is a sodium layer doping element, and the transition metal (TM) is selected from one or more of Ni, Co, Cu, Ti, Zr, Mg, Sn, Li, Cr, V, Zn and Mo. On one hand, the Y element enhances the interaction between sodium layer cations and oxygen and reduces the sodium layer spacing, so that the air stability is improved; on the other hand, the rare earth doping elements play a role of sodium layer supporting columns, interlayer slippage of the material in the electrochemical process is inhibited, and lattice distortion and irreversible phase change of the material are reduced. The obtained material has excellent air stability and cycling stability when applied to the sodium-ion battery. 本发明