US 11,710,824 B2
Lithium complex oxide for lithium secondary battery positive active material and method of preparing the same
Moon Ho Choi, Chungcheongbuk-do (KR); Jong Seung Shin, Chungcheongbuk-do (KR); Dong Hee Kim, Gyeongsangnam-do (KR); Suk Yong Jeon, Chungcheongbuk-do (KR); Hyun Jong Yu, Chungcheongbuk-do (KR); Kyoung Jun Lee, Chungcheongbuk-do (KR); and Young Nam Park, Incheon (KR)
Assigned to ECOPRO BM CO., LTD., Chungcheongbuk-Do (KR)
Filed by ECOPRO BM CO., LTD., Chungcheongbuk-do (KR)
Filed on Mar. 28, 2017, as Appl. No. 15/470,974.
Claims priority of application No. 10-2016-0098645 (KR), filed on Aug. 2, 2016; and application No. 10-2016-0130563 (KR), filed on Oct. 10, 2016.
Prior Publication US 2018/0040890 A1, Feb. 8, 2018
This patent is subject to a terminal disclaimer.
Int. Cl. H01M 4/525 (2010.01); H01M 4/36 (2006.01); H01M 10/0525 (2010.01); H01M 4/02 (2006.01)
CPC H01M 4/525 (2013.01) [H01M 4/366 (2013.01); H01M 10/0525 (2013.01); H01M 2004/028 (2013.01); Y02T 10/70 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A lithium complex oxide secondary particle formed by coagulation of a plurality of primary particles,
wherein a primary particle locating on a surface part of the secondary particle comprises a Co-coated layer at a part that is in contact with a surface of the secondary particle,
wherein Co ions have a concentration gradient toward a center part of the primary particle from the Co-coated layer in the primary particle locating on the surface part of the secondary particle,
wherein the primary particle locating on the surface part of the secondary particle has a Co concentration at a boundary between the primary particle and another primary particle that is higher than a Co concentration of an internal part of each of the primary particles, and
wherein the secondary particle has at least one peak at positions (104), (110), (113), (101), (102), and (003) during XRD analysis.