Coated sodium ion layered oxide positive electrode material and preparation method thereof

The invention provides a coated sodium ion layered oxide positive electrode material and a preparation method thereof, and relates to the field of battery materials, the preparation method comprises the following steps: preparing a powdery sodium ion layered oxide positive electrode material base material by using a layered oxide precursor and a sodium salt; tungstic acid and sodium salt are mixed and subjected to a reaction, and a slurry-shaped sodium tungstate coating material is obtained; and respectively adding the sodium tungstate coating material and the sodium ion layered oxide positive electrode material base material into an organic solvent according to a preset proportion, stirring and mixing, carrying out suction filtration and drying, and carrying out heat treatment to obtain the coated sodium ion layered oxide positive electrode material. A rapid transmission channel is provided for sodium ion diffusion, and the coating layer can effectively reduce side reaction on the surface of the positive ele