CPC H01M 4/505 (2013.01) [H01M 4/366 (2013.01); H01M 4/525 (2013.01); H01M 4/62 (2013.01); H01M 10/0525 (2013.01); H01M 2004/028 (2013.01)] | 20 Claims |
1. A ternary cathode material, comprising a LiNi1-x-y-zCoxMnyMzO2 with a micron-sized single-crystalline particle structure, wherein 0.6≤1-x-y-z<1.0, 0<x<0.2, 0<y<0.3, and 0<z<0.1; the single-crystalline particle structure comprises a central portion and a surface layer portion, wherein a first molar ratio of elements in the central portion meets Ni:Co:Mn:M=a1:x1:y1:z1, and a second molar ratio of elements in the surface layer portion meets Ni:Co:Mn:M=a2:x2:y2:z2, wherein 0.85≤a1<1.0, 0<x1<0.1, 0<y1≤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 simultaneously zero, and a1/(a1+x1+y1+z1)>a2/(a2+x2+y2+z2); and M comprises at least one selected from Al, Mg, Ti, Ga, Nb, Zr, W, Mo and Ta.
|