TERNARY POSITIVE ELECTRODE MATERIAL AND PREPARATION METHOD THEREFOR, AND LITHIUM-ION BATTERY

摘要

Provided are a ternary positive electrode material and a preparation method therefor, and a lithium-ion battery. The ternary positive electrode material comprises a micrometer-scale LiNi_1-x-y-zCo_xMn_yM_zO₂ single crystal particle structure, in the formula, 0.6≤1-x-y-z1.0, 0x＜0.2, 0y＜0.3, and 0z0.1; the single crystal particle structure comprises a central region and a surface layer region; the molar ratio of elements in the central region satisfies Ni:Co:Mn:M=a1:x1:y1:z1, and the molar ratio of elements in the surface layer region satisfies Ni:Co:Mn:M=a2:x2:y2:z2, wherein 0.85≤a11.0, 0x1≤0.1, 0y1≤0.15, 0≤z1≤0.05, 0.3≤a2≤0.7, 0.2≤x2, y2≤0.4, and 0≤z2≤0.05, z1 and z2 are not both 0, a1/(a1+x1+y1+z1)a2/(a2+x2+y2+z2), and M is selected from at least one of Al, Mg, Ti, Ga, Nb, Zr, W, Mo, and Ta.