US 11,870,061 B2
Composite cathode active material, cathode and lithium battery each containing composite cathode active material, and preparation method of cathode active material
Sukgi Hong, Seongnam-si (KR); Byongyong Yu, Suwon-si (KR); Donghee Yeon, 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 Jul. 8, 2019, as Appl. No. 16/504,620.
Claims priority of application No. 10-2018-0127694 (KR), filed on Oct. 24, 2018.
Prior Publication US 2020/0136132 A1, Apr. 30, 2020
This patent is subject to a terminal disclaimer.
Int. Cl. H01M 4/00 (2006.01); H01M 4/36 (2006.01); C01G 53/04 (2006.01); C01G 53/00 (2006.01); H01M 4/525 (2010.01); H01M 4/62 (2006.01); H01M 4/02 (2006.01)
CPC H01M 4/366 (2013.01) [C01G 53/04 (2013.01); C01G 53/50 (2013.01); H01M 4/525 (2013.01); H01M 4/628 (2013.01); C01P 2002/72 (2013.01); C01P 2002/85 (2013.01); C01P 2004/04 (2013.01); C01P 2006/40 (2013.01); H01M 2004/028 (2013.01)] 29 Claims
OG exemplary drawing
 
1. A composite cathode active material comprising:
a core comprising a plurality of primary particles; and
a shell on the core,
wherein the primary particles comprise a first lithium transition metal oxide comprising nickel,
wherein the shell comprises a first layer and a second layer on the first layer,
wherein the first layer comprises a first composition represented by Formula 1A:
M1bOc
wherein, in Formula 1A,
M1 comprises cobalt,
0.9≤b≤3.1, and 1.9≤c≤4.1,
the second layer comprises a second composition comprising cobalt and phosphorus, and an amount of the second composition included in the second layer is about 2 parts by weight or less based on 100 parts by weight of the first lithium transition metal oxide, and
wherein the core comprises a grain boundary located between primary particles of the plurality of primary particles, and the grain boundary comprises a third composition comprising Li2ZrO3.