US 12,107,258 B2
Cathode active material for lithium secondary battery and method of manufacturing the same
Sang Bok Kim, Daejeon (KR); Jik Soo Kim, Daejeon (KR); Hyo Shin Kwak, Daejeon (KR); and Myoung Lae Kim, Daejeon (KR)
Assigned to SK ON CO., LTD., Seoul (KR)
Filed by SK INNOVATION CO., LTD., Seoul (KR)
Filed on Oct. 5, 2022, as Appl. No. 17/960,600.
Application 17/960,600 is a continuation of application No. 16/692,895, filed on Nov. 22, 2019, granted, now 11,502,291.
Claims priority of application No. 10-2018-0147722 (KR), filed on Nov. 26, 2018.
Prior Publication US 2023/0089562 A1, Mar. 23, 2023
Int. Cl. H01M 4/1391 (2010.01); H01M 4/04 (2006.01); H01M 4/36 (2006.01); H01M 4/485 (2010.01); H01M 4/505 (2010.01); H01M 4/525 (2010.01); H01M 4/62 (2006.01); H01M 4/02 (2006.01); H01M 10/0525 (2010.01)
CPC H01M 4/1391 (2013.01) [H01M 4/0471 (2013.01); H01M 4/366 (2013.01); H01M 4/485 (2013.01); H01M 4/505 (2013.01); H01M 4/525 (2013.01); H01M 4/62 (2013.01); H01M 4/628 (2013.01); H01M 2004/021 (2013.01); H01M 2004/028 (2013.01); H01M 10/0525 (2013.01)] 6 Claims
 
1. A method of preparing a cathode active material for a lithium secondary battery, comprising:
preparing a lithium metal oxide particle; and
cleaning the lithium metal oxide particle using a washing solution that includes an organic poly-phosphate compound or an organic poly-phosphonate compound,
wherein the cathode active material comprises the lithium metal oxide particle and a coating layer including the organic poly-phosphate compound or the organic poly-phosphonate compound,
wherein the organic poly-phosphate is represented by Structural Formula 1 below, and the organic poly-phosphonate is represented by Structural Formula 2 below:

OG Complex Work Unit Chemistry
wherein, in the Structural Formulae 1 and 2 above, m is an integer from 2 to 20, and R1 represents an unsubstituted C1-C10 hydrocarbon group or a C1-C10 hydrocarbon group substituted with a substituent group, and the substituent group includes halogen, a cyano group, a hydroxyl group, a phosphoric acid group, a carboxylic group or a salt thereof.