	US 12,278,376 B2
	Method of preparing positive electrode active material for lithium secondary battery and positive electrode active material prepared by the same
Jung Min Han, Daejeon (KR); Gi Beom Han, Daejeon (KR); Sang Wook Lee, Daejeon (KR); Hak Yoon Kim, Daejeon (KR); So Ra Baek, Daejeon (KR); and Wang Mo Jung, Daejeon (KR)
Assigned to LG Energy Solution, Ltd., Seoul (KR)
Appl. No. 17/775,694
Filed by LG Energy Solution, Ltd., Seoul (KR)
PCT Filed Dec. 3, 2020, PCT No. PCT/KR2020/017569 § 371(c)(1), (2) Date May 10, 2022, PCT Pub. No. WO2021/112596, PCT Pub. Date Jun. 10, 2021.
Claims priority of application No. 10-2019-0159310 (KR), filed on Dec. 3, 2019.
Prior Publication US 2022/0407077 A1, Dec. 22, 2022
Int. Cl. H01M 4/62 (2006.01); C01G 53/50 (2025.01); H01M 4/04 (2006.01); H01M 4/505 (2010.01); H01M 4/525 (2010.01); H01M 10/0525 (2010.01); H01M 4/02 (2006.01)

CPC H01M 4/628 (2013.01) [C01G 53/50 (2013.01); H01M 4/0471 (2013.01); H01M 4/505 (2013.01); H01M 4/525 (2013.01); H01M 10/0525 (2013.01); C01P 2004/03 (2013.01); C01P 2004/80 (2013.01); C01P 2006/40 (2013.01); H01M 2004/021 (2013.01); H01M 2004/028 (2013.01)]

12 Claims

1. A method of preparing a positive electrode active material, the method comprising:

preparing a lithium transition metal oxide containing nickel in an amount of 60 mol % or more based on a total number of moles of metals excluding lithium;

impregnating the lithium transition metal oxide with 300 ppm to 1,000 ppm of moisture based on 100 parts by weight of the lithium transition metal oxide; and

performing a heat treatment on the lithium transition metal oxide impregnated with the moisture,

wherein a lithium by-product present on a surface of the lithium transition metal oxide and the moisture react to form a passivation layer, having a rock-salt structure, on the surface of the lithium transition metal oxide.