US 12,391,575 B2
Positive electrode active material and preparation method thereof, positive electrode plate, lithium-ion secondary battery, and battery module, battery pack, and apparatus containing such lithium-ion secondary battery
Shushi Dou, Ningde (CN); Chunhua Hu, Ningde (CN); Yao Jiang, Ningde (CN); Qi Wu, Ningde (CN); Jinhua He, Ningde (CN); and Bin Deng, Ningde (CN)
Assigned to CONTEMPORARY AMPEREX TECHNOLOGY (HONG KONG) LIMITED, Hong Kong (CN)
Filed by CONTEMPORARY AMPEREX TECHNOLOGY (HONG KONG) LIMITED, Hong Kong (CN)
Filed on Mar. 1, 2022, as Appl. No. 17/683,570.
Application 17/683,570 is a continuation of application No. PCT/CN2020/109828, filed on Aug. 18, 2020.
Claims priority of application No. 201910824785.7 (CN), filed on Sep. 2, 2019.
Prior Publication US 2022/0185698 A1, Jun. 16, 2022
Int. Cl. C01G 53/50 (2025.01); H01M 10/0525 (2010.01)
CPC C01G 53/50 (2013.01) [H01M 10/0525 (2013.01); C01P 2002/54 (2013.01); C01P 2004/61 (2013.01); C01P 2006/10 (2013.01); C01P 2006/11 (2013.01); C01P 2006/12 (2013.01); C01P 2006/40 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A positive electrode active material, comprising secondary particles formed by agglomeration of primary particles, wherein the primary particles comprise a layered nickel-containing lithium composite oxide, and the nickel-containing lithium composite oxide comprises a doping element; and
when the positive electrode active material is charged from an 11% delithiated state to a 78% delithiated state at a rate of 0.1 C, a lattice of the primary particles has a maximum shrinkage rate satisfying Δamax≤3.00% in an a-axis direction, and a maximum swelling rate satisfying Δcmax≤3.02% in a c-axis direction;
wherein a relative deviation of a local mass concentration of the doping element in the secondary particles is less than 30%; and
wherein a true doping concentration φ of the positive electrode active material satisfies 2300 μg/cm3≤φ≤49000 μg/cm3.