US 12,244,010 B2
Method for preparing positive electrode active material for lithium secondary battery, positive electrode comprising the positive electrode active material prepared by the same and lithium secondary battery
Ick Soon Kwak, Daejeon (KR); Chang Wan Chae, Daejeon (KR); Hyo Joung Nam, Daejeon (KR); and Hye Ji Jeon, Daejeon (KR)
Assigned to LG Chem, Ltd., Seoul (KR)
Appl. No. 17/605,806
Filed by LG Chem, Ltd., Seoul (KR)
PCT Filed Jan. 11, 2021, PCT No. PCT/KR2021/000312
§ 371(c)(1), (2) Date Oct. 22, 2021,
PCT Pub. No. WO2021/141463, PCT Pub. Date Jul. 15, 2021.
Claims priority of application No. 10-2020-0003833 (KR), filed on Jan. 10, 2020.
Prior Publication US 2022/0209231 A1, Jun. 30, 2022
Int. Cl. H01M 4/525 (2010.01); C01G 53/50 (2025.01); H01M 4/04 (2006.01); H01M 4/36 (2006.01); H01M 4/505 (2010.01); H01M 4/58 (2010.01); H01M 10/0525 (2010.01); H01M 4/02 (2006.01)
CPC H01M 4/525 (2013.01) [C01G 53/50 (2013.01); H01M 4/0471 (2013.01); H01M 4/366 (2013.01); H01M 4/505 (2013.01); H01M 4/5825 (2013.01); H01M 10/0525 (2013.01); C01P 2004/61 (2013.01); C01P 2004/80 (2013.01); C01P 2006/40 (2013.01); H01M 2004/021 (2013.01); H01M 2004/028 (2013.01)] 8 Claims
 
1. A method of manufacturing a positive electrode active material for a lithium secondary battery, comprising:
a first step of preparing an anhydrous lithium raw material, wherein the anhydrous lithium raw material is LiOH comprising pulverizing hydrated lithium hydroxide (LiOH·H2O) having an average particle size (D50) of 300 μm or more until the average particle size (D50) becomes 50 μm to 250 μm to form a primary pulverized lithium hydroxide, vacuum-drying the primarily pulverized lithium hydroxide at 100° C. to 150° C. for 1 hour to 30 hours to form a vacuum-dried lithium hydroxide, and subsequently secondarily pulverizing the vacuum-dried lithium hydroxide until the average particle size (D50) becomes 5 μm to 30 μm;
a second step of dry-mixing a transition metal hydroxide and the anhydrous lithium raw material to form a mixture;
a third step of subjecting the mixture of the transition metal hydroxide and the anhydrous lithium raw material to primary firing to form a primarily fired material; and
a fourth step of finely pulverizing and mixing the primarily fired material and subsequently performing secondary firing, and thus obtaining a lithium transition metal oxide,
wherein, in the second step, the anhydrous lithium raw material is mixed at 40 parts by weight or less based on 100 parts by weight of the transition metal hydroxide.