US 12,406,989 B2
Composite cathode active material, cathode and lithium battery including the same, and method of preparing the composite cathode active material
Kwangjin Park, Seongnam-si (KR); Dongsu Ko, Seoul (KR); Kyoungmin Min, Suwon-si (KR); Changhoon Jung, Seoul (KR); and Byungjin Choi, Seoul (KR)
Assigned to SAMSUNG ELECTRONICS CO., LTD., Gyeonggi-Do (KR); and SAMSUNG SDI CO., LTD., Gyeonggi-Do (KR)
Filed by Samsung Electronics Co., Ltd., Suwon-si (KR); and Samsung SDI Co., Ltd., Yongin-si (KR)
Filed on Sep. 26, 2023, as Appl. No. 18/474,350.
Application 18/474,350 is a continuation of application No. 15/860,901, filed on Jan. 3, 2018, granted, now 11,799,078.
Claims priority of application No. 10-2017-0083607 (KR), filed on Jun. 30, 2017.
Prior Publication US 2024/0030434 A1, Jan. 25, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. H01M 10/0525 (2010.01); H01M 4/04 (2006.01); H01M 4/1391 (2010.01); H01M 4/36 (2006.01); H01M 4/485 (2010.01); H01M 4/505 (2010.01); H01M 4/525 (2010.01); H01M 10/052 (2010.01); H01M 4/02 (2006.01)
CPC H01M 4/525 (2013.01) [H01M 4/0471 (2013.01); H01M 4/1391 (2013.01); H01M 4/366 (2013.01); H01M 4/485 (2013.01); H01M 4/505 (2013.01); H01M 10/052 (2013.01); C01P 2002/32 (2013.01); C01P 2002/72 (2013.01); C01P 2004/04 (2013.01); H01M 2004/028 (2013.01); H01M 10/0525 (2013.01)] 23 Claims
OG exemplary drawing
 
1. A composite cathode active material comprising:
a core comprising a plurality of primary particles comprising a nickel-containing first lithium transition metal oxide having a layered crystal structure, and
a grain boundary between adjacent primary particles of the plurality of primary particles; and
a shell on the core, the shell comprising a second lithium transition metal oxide having a spinel crystal structure,
wherein the grain boundary comprises a first composition having a spinel crystal structure,
wherein a concentration of manganese and cobalt in the grain boundary is greater than a concentration of manganese and cobalt in the primary particles respectively, and
wherein the second lithium transition metal oxide is represented by Formula 7:
LiaMnbCocM5′dO4  Formula 7
wherein, in Formula 7,
M5′ comprises vanadium, chromium, iron, zirconium, rhenium, aluminum, boron, germanium, ruthenium, tin, titanium, niobium, molybdenum, or platinum,
0.9≤a≤1.1, 0<b<2.0, 0<c<2.0, 0≤d<0.1, and b+c+d=2.