US 12,456,729 B2
Positive electrode active material and lithium secondary battery comprising the same
Moon Ho Choi, Cheongju-si (KR); Jun Won Suh, Cheongju-si (KR); Jin Kyeong Yun, Cheongju-si (KR); Jung Han Lee, Cheongju-si (KR); Mi Hye Yun, Cheongju-si (KR); Seung Woo Choi, Cheongju-si (KR); Gwang Seok Choe, Cheongju-si (KR); Ye Ri Jang, Cheongju-si (KR); and Joong Ho Bae, Cheongju-si (KR)
Assigned to ECOPRO BM CO., LTD., Cheongju-si (KR)
Filed by ECOPRO BM CO., LTD., Cheongju-si (KR)
Filed on Feb. 14, 2024, as Appl. No. 18/440,988.
Application 18/440,988 is a continuation of application No. 17/035,672, filed on Sep. 28, 2020, granted, now 11,942,635.
Claims priority of application No. 10-2019-0129755 (KR), filed on Oct. 18, 2019.
Prior Publication US 2024/0186506 A1, Jun. 6, 2024
Int. Cl. H01M 4/36 (2006.01); H01M 4/02 (2006.01); H01M 4/131 (2010.01); H01M 4/505 (2010.01); H01M 4/525 (2010.01); H01M 10/0525 (2010.01)
CPC H01M 4/525 (2013.01) [H01M 4/131 (2013.01); H01M 4/366 (2013.01); H01M 4/505 (2013.01); H01M 10/0525 (2013.01); H01M 2004/021 (2013.01); H01M 2004/028 (2013.01); Y02E 60/10 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A positive electrode active material, comprising:
a bulk particle consisting of a plurality of primary particles that are lithium composite oxides enabling lithium intercalation and deintercalation,
wherein a first concentration gradient section in which the concentration of at least one of metal elements constituting the primary particles in the bulk particle increases in a direction (transverse direction) perpendicular to a direction (longitudinal direction) toward a surface region of the bulk particle from a core region of the bulk particle, and a second concentration gradient section in which the concentration of at least one of metal elements constituting the primary particles in the bulk particle decreases in a direction (transverse direction) perpendicular to a direction (longitudinal direction) toward a surface region of the bulk particle from a core region of the bulk particle, are present in the bulk particle,
wherein the first concentration gradient and the second concentration gradient section are laterally arranged along a circumferential surface of the bulk particle.