US 11,894,554 B2
Cathode active material for lithium secondary battery, method for preparing same, and lithium secondary battery comprising same
Jungmin Han, Yongin-si (KR); Kihyun Kim, Yongin-si (KR); Jaeho Lee, Yongin-si (KR); and Ming-Zi Hong, Yongin-si (KR)
Assigned to Samsung SDI Co., Ltd., Yongin-si (KR)
Appl. No. 16/320,057
Filed by Samsung SDI Co., Ltd., Yongin-si (KR)
PCT Filed Aug. 22, 2017, PCT No. PCT/KR2017/009165
§ 371(c)(1), (2) Date Jan. 23, 2019,
PCT Pub. No. WO2018/038509, PCT Pub. Date Mar. 1, 2018.
Claims priority of application No. 10-2016-0107110 (KR), filed on Aug. 23, 2016.
Prior Publication US 2021/0280862 A1, Sep. 9, 2021
Int. Cl. H01M 4/38 (2006.01); H01M 4/505 (2010.01); H01M 4/525 (2010.01); H01M 10/0525 (2010.01)
CPC H01M 4/505 (2013.01) [H01M 4/382 (2013.01); H01M 4/525 (2013.01); H01M 10/0525 (2013.01)] 11 Claims
OG exemplary drawing
 
9. A method for preparing a cathode active material for a lithium secondary battery, the method comprising
washing a first active material with ammonia water to obtain a second active material, the second active material comprising a lithium metal compound and a lithium compound on a surface of the lithium metal compound,
wherein the lithium metal compound is different from the lithium compound,
the content of lithium contained in the lithium compound is 0.25 parts by weight or less with respect to 100 parts by weight of the lithium metal compound,
a specific surface area of the cathode active material is 0.5 m2/g to 2.0 m2/g, and
a pH of the cathode active material is 11.5 to 12.1.