POSITIVE ELECTRODE ACTIVE MATERIAL, PREPARATION METHOD THEREFOR AND USE THEREOF

The present application provides a positive electrode active material, a preparation method therefor and the use thereof. The positive electrode active material may comprise a spinel lithium nickel manganese oxide material, wherein the spinel lithium nickel manganese oxide material has the following chemical formula: LiNiMnMO, wherein M is selected from at least one of Mg, Zn, Ti, Zr, W, Nb, Al, B, P, Mo, V, or Cr, 0.9≤a≤1.1, −0.2≤x≤0.2, −0.02≤y≤0.3, and x+y≥0; the Mn content in the spinel lithium nickel manganese oxide material may be less than or equal to 0.7 wt %.