Positive electrode material and preparation method and usage thereof

A positive electrode material, comprising a substrate, wherein a general formula of the substrate is LixNiyCozMkMepOrAm, wherein 0.95≤x≤1.05, 0.5≤y≤1, 0≤z≤1, 0≤k≤1, 0≤p≤0.1, 1≤r≤5.2, 0≤m≤2, m+r≤2, M is selected from Mn and/or Al, Me is selected from one or more of Zr, Zn, Cu, Cr, Mg, Fe, V, Ti, Sr, Sb, Y, W, and Nb, and A is selected from one or more of N, F, S, and Cl;

• and
• an oxygen defect level of the positive electrode material satisfies at least one of condition (1) and condition (2):
• 1.77≤OD1≤1.90, where OD1=(I101/I012)0.5, (1)
• I101 represents XRD diffraction peak intensity of the (101) crystal plane of the positive electrode material in an XRD pattern, and I012 represents diffraction peak intensity of the (012) crystal plane of the positive electrode material in the XRD pattern;
• and
• 0.69≤OD2≤0.74, where OD2=(I101/I104)0.5, (2)
• I101 represents the XRD diffraction peak intensity of the (101) crystal plane of the positive electrode material in the XRD pattern, and I104 represents diffraction peak intensity of the (104) crystal plane of the positive electrode material in the XRD pattern, wherein Li2CO3 content in residual lithium on the surface of the positive electrode material is less than 3000 ppm, and LiOH content on the surface of the positive electrode material is less than 5000 ppm.