US 12,170,367 B2
Positive electrode active material precursor for secondary battery, preparation method thereof, and method of preparing positive electrode active material
Min Joon Lee, Daejeon (KR); Seung Beom Cho, Daejeon (KR); Seong Ji Ye, Daejeon (KR); and Yoon Bin Park, Daejeon (KR)
Assigned to LG Chem, Ltd., Seoul (KR)
Appl. No. 17/606,648
Filed by LG Chem, Ltd., Seoul (KR)
PCT Filed Sep. 25, 2020, PCT No. PCT/KR2020/013069
§ 371(c)(1), (2) Date Oct. 26, 2021,
PCT Pub. No. WO2021/060911, PCT Pub. Date Apr. 1, 2021.
Claims priority of application No. 10-2019-0119111 (KR), filed on Sep. 26, 2019.
Prior Publication US 2022/0238871 A1, Jul. 28, 2022
Int. Cl. H01M 4/505 (2010.01); C01G 53/00 (2006.01); H01M 4/525 (2010.01); H01M 4/02 (2006.01)
CPC H01M 4/505 (2013.01) [C01G 53/44 (2013.01); H01M 4/525 (2013.01); C01P 2002/52 (2013.01); C01P 2004/03 (2013.01); C01P 2004/54 (2013.01); C01P 2004/61 (2013.01); C01P 2006/11 (2013.01); C01P 2006/12 (2013.01); C01P 2006/40 (2013.01); H01M 2004/021 (2013.01); H01M 2004/028 (2013.01)] 10 Claims
 
1. A method of preparing a positive electrode active material precursor for a secondary battery, the method comprising: preparing a positive electrode active material precursor by a co-precipitation reaction while adding a transition metal-containing solution containing transition metal cations, a basic solution, and an ammonium solution to a batch-type reactor,
wherein a molar ratio of ammonium ions contained in the ammonium solution to the transition metal cations contained in the transition metal-containing solution added to the batch-type reactor is 0.5 or less,
wherein a pH in the batch-type reactor is maintained at 11.2 or less, and
wherein particle nucleation and particle growth are performed without changing the pH in the batch-type reactor during the co-precipitation reaction.