Patent ID: 11955633
Assignee: CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  C  Y | IPC H

Claim 0:
1. 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) 1.77≤OD1≤1.90, wherein OD1=(I101/I012)0.5, 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
(2) 0.69≤OD2≤0.74, wherein OD2=(I101/I104)0.5, I101 represents the XRD diffraction peak intensity of the (101) crystal plane of the positive electrode material in the XRD pattern, and 1104 represents diffraction peak intensity of the (104) crystal plane of the positive electrode material in the XRD pattern; wherein a mean microstress (MMS) of the positive electrode material ranges from 0.03 to 0.20, wherein MMS=(βhkl·cot θhkl/4, βhkl represents a half-peak width of a characteristic diffraction peak (hkl) in the XRD pattern of the positive electrode material, and θhkl represents a diffraction angle corresponding to the characteristic diffraction peak (hkl) in the XRD pattern of the positive electrode material.