US 12,244,004 B2
Composite cathode material for lithium-ion battery, and vehicle
Yi Pan, Shenzhen (CN); Rong Hao, Shenzhen (CN); Na Chen, Shenzhen (CN); and Xiaotao Yuan, Shenzhen (CN)
Assigned to BYD COMPANY LIMITED, Shenzhen (CN)
Appl. No. 17/614,285
Filed by BYD COMPANY LIMITED, Guangdong (CN)
PCT Filed May 27, 2020, PCT No. PCT/CN2020/092654
§ 371(c)(1), (2) Date Nov. 24, 2021,
PCT Pub. No. WO2020/238968, PCT Pub. Date Dec. 3, 2020.
Claims priority of application No. 201910450988.4 (CN), filed on May 28, 2019.
Prior Publication US 2022/0255066 A1, Aug. 11, 2022
Int. Cl. H01M 4/36 (2006.01); H01M 4/505 (2010.01); H01M 4/525 (2010.01); H01M 10/0525 (2010.01); H01M 4/02 (2006.01)
CPC H01M 4/366 (2013.01) [H01M 4/505 (2013.01); H01M 4/525 (2013.01); H01M 10/0525 (2013.01); H01M 2004/021 (2013.01); H01M 2004/028 (2013.01); H01M 2220/20 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A composite cathode material for a lithium-ion battery, wherein a core of the cathode material is a lithium-nickel-cobalt-manganese oxide material, a surface layer of the cathode material is a lithium-nickel-cobalt oxide material doped with an element E, there is a transition layer between the core and the surface layer, the transition layer is a lithium-nickel-cobalt-manganese oxide material doped with the element E, and a content of the element E in the transition layer shows a decreasing trend in a direction from the surface layer of the cathode material to the core;
a general formula for the composition of the transition layer is Li1+mNi1-x-y-zCoxMnyEzO2, wherein 0≤m≤0.1, 0.01≤x≤0.1, 0.01≤y≤0.1, and 0.01≤z≤0.1;
E is one or more of Al, Zr, Ti, Y, Ba, and Sr; and
wherein with the total weight of the cathode material as a reference, the content of the transition layer accounts for 0.5% to 12% by weight.