	US 11,993,846 B2
	Method of preparing positive electrode active material for secondary battery
Seul Ki Chae, Daejeon (KR); Dae Jin Lee, Daejeon (KR); Dong Hwi Kim, Daejeon (KR); Jin Tae Hwang, Daejeon (KR); Hyeong Il Kim, Daejeon (KR); Wang Mo Jung, Daejeon (KR); and Dong Hun Lee, Daejeon (KR)
Assigned to LG Energy Solution, Ltd., Seoul (KR)
Appl. No. 17/781,925
Filed by LG Energy Solution, Ltd., Seoul (KR)
PCT Filed Jan. 12, 2021, PCT No. PCT/KR2021/000406 § 371(c)(1), (2) Date Jun. 2, 2022, PCT Pub. No. WO2021/145647, PCT Pub. Date Jul. 22, 2021.
Claims priority of application No. 10-2020-0004990 (KR), filed on Jan. 14, 2020.
Prior Publication US 2023/0002899 A1, Jan. 5, 2023
Int. Cl. H01M 4/04 (2006.01); C23C 16/455 (2006.01); H01M 4/36 (2006.01); H01M 4/505 (2010.01); H01M 4/525 (2010.01); H01M 4/02 (2006.01)

CPC C23C 16/45555 (2013.01) [H01M 4/0428 (2013.01); H01M 4/366 (2013.01); H01M 4/505 (2013.01); H01M 4/525 (2013.01); H01M 2004/028 (2013.01)]

13 Claims

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

preparing a lithium composite transition metal oxide which includes nickel, cobalt, and manganese and contains 60 mol % or more of the nickel among all metals except lithium;

adding a moisture absorbent and the lithium composite transition metal oxide into an atomic layer deposition (ALD) reactor; and

adding a coating metal precursor into the atomic layer deposition (ALD) reactor, and forming a metal oxide coating layer from the coating metal precursor on surfaces of particles of the lithium composite transition metal oxide by an atomic layer deposition (ALD).