US 12,479,740 B2
Lithium nickel manganese cobalt oxide high-nickel single-crystal positive electrode material and preparation method therefor
Kaihua Xu, Wuxi (CN); Wei Li, Wuxi (CN); Dechong Liu, Wuxi (CN); Jun Xie, Wuxi (CN); Ningjing Liao, Wuxi (CN); Yang Shi, Wuxi (CN); Xiaoyan Zhou, Wuxi (CN); Yujun Chen, Wuxi (CN); and Shiguo Xu, Wuxi (CN)
Assigned to GEM (WUXI) ENERGY MATERIALS CO., LTD., Wuxi (CN)
Appl. No. 18/723,511
Filed by GEM (WUXI) ENERGY MATERIALS CO., LTD., Wuxi (CN)
PCT Filed Jul. 29, 2022, PCT No. PCT/CN2022/108807
§ 371(c)(1), (2) Date Jun. 24, 2024,
PCT Pub. No. WO2023/124051, PCT Pub. Date Jul. 6, 2023.
Claims priority of application No. 202111653919.7 (CN), filed on Dec. 30, 2021.
Prior Publication US 2024/0417275 A1, Dec. 19, 2024
Int. Cl. H01M 4/36 (2006.01); C01G 53/50 (2025.01); C30B 29/22 (2006.01); H01M 4/525 (2010.01); H01M 4/62 (2006.01); H01M 10/42 (2006.01); H01M 4/02 (2006.01)
CPC C01G 53/50 (2013.01) [C30B 29/22 (2013.01); H01M 4/366 (2013.01); H01M 4/525 (2013.01); H01M 4/62 (2013.01); H01M 10/4235 (2013.01); C01P 2002/52 (2013.01); C01P 2004/03 (2013.01); C01P 2004/84 (2013.01); C01P 2006/40 (2013.01); H01M 2004/028 (2013.01)] 3 Claims
 
1. A method for preparing a lithium nickel manganese cobalt oxide high-nickel single-crystal positive electrode material, wherein the method comprises the following steps:
mixing and ball milling nickel cobalt manganese hydroxide with a LiOH·H2O, zirconium oxide, tungsten oxide and sodium carbonate, then performing primary sintering, pulverizing and then obtaining a lithium nickel manganese cobalt oxide high-nickel single-crystal positive electrode material intermediate, wherein: a molar ratio of the nickel cobalt manganese hydroxide to zirconium oxide, tungsten oxide, and sodium carbonate is 1:0.002:0.0016:0.002, the chemical composition of the nickel cobalt manganese hydroxide is Ni0.80Co0.10Mn0.10(OH)2; a molar ratio of the nickel cobalt manganese hydroxide to lithium in the LiOH·H2O is 1:1.05, and the temperature of the primary sintering is 950° C., a time of the primary sintering is 15 h;
evenly mixing the lithium nickel manganese cobalt oxide high-nickel single-crystal positive electrode material intermediate and a coating agent, and then performing secondary sintering to obtain a lithium nickel manganese cobalt oxide high-nickel single-crystal positive electrode material, wherein the coating agent is Y2O3; the amount of the coating agent added is 0.05 wt % to 5 wt % of the total amount of the lithium nickel manganese cobalt oxide high-nickel single-crystal positive electrode material intermediate; a temperature of the secondary sintering is 500° C., a time of the secondary sintering is in a range from 10 h.