US 12,230,787 B2
Cathode active material for rechargeable lithium battery comprising coating layer comprising lithium fluoride and metal fluoride and method for manufacturing the same
Soohyeon Kim, Yongin-si (KR); and Jongmin Kim, Yongin-si (KR)
Assigned to Samsung SDI Co., Ltd., Yongin-si (KR)
Appl. No. 17/250,665
Filed by Samsung SDI Co., Ltd., Yongin-si (KR)
PCT Filed Jun. 14, 2019, PCT No. PCT/KR2019/007216
§ 371(c)(1), (2) Date Feb. 17, 2021,
PCT Pub. No. WO2020/045802, PCT Pub. Date Mar. 5, 2020.
Claims priority of application No. 10-2018-0100643 (KR), filed on Aug. 27, 2018.
Prior Publication US 2021/0305550 A1, Sep. 30, 2021
Int. Cl. H01M 4/36 (2006.01); H01M 4/02 (2006.01); H01M 4/04 (2006.01); H01M 4/136 (2010.01); H01M 4/505 (2010.01); H01M 4/525 (2010.01); H01M 10/0525 (2010.01)
CPC H01M 4/366 (2013.01) [H01M 4/0471 (2013.01); H01M 4/505 (2013.01); H01M 4/525 (2013.01); H01M 2004/021 (2013.01); H01M 2004/028 (2013.01); H01M 4/136 (2013.01); H01M 10/0525 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A positive active material for a rechargeable lithium battery, comprising
a nickel-based composite oxide having a nickel content of greater than or equal to 60 mol % relative to a total amount of metal excluding lithium and a coating layer on the surface of the nickel-based composite oxide,
wherein the coating layer comprises:
lithium fluoride (LiF) produced through a reaction of residual lithium of the nickel-based composite oxide with fluorine of a fluorine-based organic material; and
a metal fluoride produced by firing a metal oxide and the fluorine-based organic material, and
wherein the lithium fluoride and metal fluoride are present in a form of nano-sized particulates having a size of greater than or equal to 5 nm and less than or equal to 40 nm.