	US 12,080,886 B2
	Method of washing positive electrode active material, and positive electrode active material prepared thereby
Won Sig Jung, Daejeon (KR); Sang Soon Choi, Daejeon (KR); and Hyun Ah Park, Daejeon (KR)
Assigned to LG Chem, Ltd., Seoul (KR)
Appl. No. 17/050,919
Filed by LG Chem, Ltd., Seoul (KR)
PCT Filed May 7, 2019, PCT No. PCT/KR2019/005428 § 371(c)(1), (2) Date Oct. 27, 2020, PCT Pub. No. WO2019/212321, PCT Pub. Date Nov. 7, 2019.
Claims priority of application No. 10-2018-0051714 (KR), filed on May 4, 2018.
Prior Publication US 2021/0234164 A1, Jul. 29, 2021
Int. Cl. H01M 4/525 (2010.01); B08B 3/08 (2006.01); C01G 53/00 (2006.01); H01M 4/02 (2006.01); H01M 4/36 (2006.01); H01M 4/505 (2010.01); H01M 10/0525 (2010.01)

CPC H01M 4/525 (2013.01) [B08B 3/08 (2013.01); C01G 53/50 (2013.01); H01M 4/366 (2013.01); H01M 4/505 (2013.01); H01M 10/0525 (2013.01); C01P 2004/80 (2013.01); C01P 2006/40 (2013.01); H01M 2004/028 (2013.01)]

6 Claims

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

(1) preparing a lithium composite transition metal oxide which comprises Ni, Co, and Mn, and an Ni content is 60 mol % or more;

(2) putting the lithium composite transition metal oxide into water; and

(3) adding a weak acid to the water to decrease the pH to 7 to 10,

wherein the weak acid is one or more selected from the group consisting of phosphorous pentoxide (P₂O₅), phosphoric acid, acetic acid, oxalic acid, citric acid, and boric acid.