	US 12,378,133 B2
	Method of preparing positive electrode active material for secondary battery
Kyung Lok Lee, Daejeon (KR); Ji A Shin, Daejeon (KR); Min Kyu You, Daejeon (KR); and Sang Soon Choi, Daejeon (KR)
Assigned to LG Chem, Ltd., Seoul (KR)
Appl. No. 17/422,014
Filed by LG Chem, Ltd., Seoul (KR)
PCT Filed Jan. 21, 2020, PCT No. PCT/KR2020/000996 § 371(c)(1), (2) Date Jul. 9, 2021, PCT Pub. No. WO2020/153701, PCT Pub. Date Jul. 30, 2020.
Claims priority of application No. 10-2019-0007296 (KR), filed on Jan. 21, 2019.
Prior Publication US 2022/0098054 A1, Mar. 31, 2022
Int. Cl. C01G 53/50 (2025.01); H01M 4/02 (2006.01); H01M 4/04 (2006.01); H01M 4/505 (2010.01); H01M 4/525 (2010.01)

CPC C01G 53/50 (2013.01) [H01M 4/0471 (2013.01); H01M 4/505 (2013.01); H01M 4/525 (2013.01); C01P 2002/32 (2013.01); C01P 2006/40 (2013.01); H01M 2004/028 (2013.01)]

6 Claims

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

preparing a positive electrode active material precursor containing 60 mol % or more of nickel (Ni) among total metals;

mixing the positive electrode active material precursor and a lithium raw material source, and performing primary pre-sintering in an oxidizing atmosphere to form a pre-sintered product; and

performing secondary main sintering on the pre-sintered product in an air atmosphere to form a lithium transition metal oxide,

wherein the primary pre-sintering is performed while supplying oxygen,

wherein the primary pre-sintering is performed for 3 hours to 7 hours after a sintering temperature is reached,

wherein the secondary main sintering is performed after stopping oxygen supply,

wherein the positive electrode active material precursor is a compound including nickel (Ni), cobalt (Co), and manganese (Mn), and

wherein the pre-sintered product has a structure including a layered structure.