US 11,996,555 B2
Ternary cathode material, preparation method therefor, and lithium ion battery
Yongqing Gan, Shenzhen (CN); Shicai Li, Shenzhen (CN); Dongjie Hu, Shenzhen (CN); Xiao Shi, Shenzhen (CN); and Wei Song, Shenzhen (CN)
Assigned to BYD COMPANY LIMITED, Shenzhen (CN)
Appl. No. 17/272,177
Filed by BYD COMPANY LIMITED, Guangdong (CN)
PCT Filed Aug. 28, 2019, PCT No. PCT/CN2019/103089
§ 371(c)(1), (2) Date Feb. 26, 2021,
PCT Pub. No. WO2020/043135, PCT Pub. Date Mar. 5, 2020.
Claims priority of application No. 201810990236.2 (CN), filed on Aug. 28, 2018.
Prior Publication US 2021/0367233 A1, Nov. 25, 2021
Int. Cl. H01M 4/505 (2010.01); H01M 4/02 (2006.01); H01M 4/36 (2006.01); H01M 4/525 (2010.01); H01M 4/62 (2006.01); H01M 10/0525 (2010.01)
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
OG exemplary drawing
 
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.