MODIFIED SODIUM-ION BATTERY POSITIVE ELECTRODE PRECURSOR, AND PREPARATION METHOD THEREFOR AND USE THEREOF

Provided in the present application are a modified sodium-ion battery positive electrode precursor, and a preparation method therefor and the use thereof. The preparation method comprises the following steps: (1) mixing a nickel source, a manganese source and an iron source with a solvent to obtain a solution A, and mixing a doped metal salt with the solvent to obtain a solution B; and (2) adding the solution A, the solution B, a precipitator and a complexing agent in a parallel flow manner to a base solution for reaction, and once the D50 of the particles in a container reaches a target particle size, removing iron from the mixture to obtain a modified sodium-ion battery positive electrode precursor. In the present application, element doping is performed on the basis that no cobalt material is contained, such that the raw material cost is reduced, and the structural stability and thermal stability of the material are improved while ensuring a high capacity, thereby improving the cycle performance and the sa