Modified layered oxide sodium-ion battery positive electrode material as well as preparation method and application thereof

The invention discloses a modified layered oxide sodium-ion battery positive electrode material as well as a preparation method and application thereof, and belongs to the technical field of sodium-ion battery positive electrode materials. Transition metal oxalate and a coating agent are dispersed in an alcohol solvent, the transition metal oxalate with the uniformly and firmly coated surface is obtained after a hydrothermal reaction, the transition metal oxalate is mixed with a sodium source and then placed in an air atmosphere to be pre-sintered, the transition metal oxalate is decomposed at high temperature to generate gas, and therefore a porous structure is generated in situ; and then obtaining the modified layered oxide sodium-ion battery positive electrode material by adopting a high-temperature solid-phase method. The porous structure can increase the number of active sites of sodium ions on the surface and improve the diffusivity of the sodium ions. The coating layer can isolate the contact between a