Positive electrode material and preparation method and application thereof

The invention provides a positive electrode material and a preparation method and application thereof. The first aspect of the invention provides a positive electrode material, the chemical formula of the positive electrode material is LixNiyCozA1-y-zO2, x is greater than or equal to 0.9 and less than or equal to 1.1, y is greater than or equal to 0.6 and less than or equal to 1, z is greater than or equal to 0 and less than or equal to 0.4, and A is selected from one or more of Mn, Al, W, B, F, P, Ti, V, Al, Ce, Zr, Mg, Y, Sr, Nb, Mo, Sb, Ta and Ge; the content of LiCO3 on the surface of the positive electrode material is 400-1200 ppm, the content of LiOH is 3000-4500 ppm, and the cell parameter c of the positive electrode material is that the lithium ion diffusion coefficient D of the positive electrode material is greater than 2.5 * 10 cm < 2 >/S under 20% SOC of the battery comprising the positive electrode material. The positive electrode material provided by the invention is helpful for improving