US 12,170,370 B2
Lithium composite oxide and lithium secondary battery comprising the same
Moon Ho Choi, Cheongju-si (KR); Hyun Jong Yu, Cheongju-si (KR); Chang Woo Lee, Cheongju-si (KR); and Yu Kyung Chun, Cheongju-si (KR)
Assigned to ECOPRO BM CO., LTD., Cheongju-si (KR)
Filed by ECOPRO BM CO., LTD., Cheongju-si (KR)
Filed on Feb. 28, 2023, as Appl. No. 18/176,146.
Application 18/176,146 is a continuation of application No. 17/095,135, filed on Nov. 11, 2020, granted, now 11,631,849.
Claims priority of application No. 10-2019-0156946 (KR), filed on Nov. 29, 2019; and application No. 10-2020-0051352 (KR), filed on Apr. 28, 2020.
Prior Publication US 2024/0186502 A1, Jun. 6, 2024
Int. Cl. H01M 4/525 (2010.01); C01G 53/00 (2006.01); H01M 4/02 (2006.01); H01M 4/36 (2006.01); H01M 4/485 (2010.01); H01M 10/0525 (2010.01)
CPC H01M 4/525 (2013.01) [C01G 53/50 (2013.01); H01M 4/366 (2013.01); H01M 4/485 (2013.01); H01M 10/0525 (2013.01); C01P 2002/54 (2013.01); C01P 2002/60 (2013.01); C01P 2002/72 (2013.01); C01P 2002/77 (2013.01); C01P 2002/78 (2013.01); C01P 2002/85 (2013.01); C01P 2004/04 (2013.01); C01P 2004/50 (2013.01); C01P 2004/84 (2013.01); C01P 2006/40 (2013.01); H01M 2004/028 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A lithium composite oxide, comprising:
primary particles enabling lithium intercalation and deintercalation and a secondary particle in which the primary particles are aggregated,
wherein the lithium composite oxide comprises niobium (Nb) as dopant,
wherein a content of niobium (Nb) has a gradient decreasing from a surface region of the secondary particle to a core of the secondary particle, and
an interplanar distance (d1) of a (003) plane of a crystal structure in the primary particle and an interplanar distance (d2) of a (400) plane of a crystal structure in an interface between the primary particles satisfy Relational Expression 1 below.
d1−d2>0.0005  Relational Expression 1.