US 12,132,202 B2
Cathode active material for lithium secondary battery, preparation method thereof, cathode including cathode active material, and lithium secondary battery including cathode
Dongwook Shin, Yongin-si (KR); and Jinhwan Park, Yongin-si (KR)
Assigned to SAMSUNG SDI CO., LTD., Yongin-si (KR)
Filed by Samsung SDI Co., Ltd., Yongin-si (KR)
Filed on Oct. 27, 2020, as Appl. No. 17/081,125.
Claims priority of application No. 10-2019-0135760 (KR), filed on Oct. 29, 2019.
Prior Publication US 2021/0126256 A1, Apr. 29, 2021
Int. Cl. H01M 4/52 (2010.01); C01G 53/00 (2006.01); H01M 4/36 (2006.01); H01M 4/48 (2010.01); H01M 4/525 (2010.01); H01M 10/05 (2010.01); H01M 10/0525 (2010.01); H01M 4/02 (2006.01)
CPC H01M 4/525 (2013.01) [C01G 53/50 (2013.01); H01M 4/366 (2013.01); H01M 4/483 (2013.01); H01M 10/0525 (2013.01); H01M 2004/021 (2013.01); H01M 2004/028 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A cathode active material for a lithium secondary battery, the cathode active material comprising:
a secondary particle comprising a plurality of primary particles; and
a first coating layer disposed on the primary particles to have a thickness of 2.5 nm or less, the first coating layer comprising a NiO-like crystalline phase belonging to a Fm3-m space group.