US 12,107,268 B2
Composite positive electrode active material for lithium secondary battery, preparation method thereof, and lithium secondary battery including positive electrode including the same
Kwanghwan Cho, Yongin-si (KR); Moonsu Yoon, Ulsan (KR); and Jaephil Cho, Ulsan (KR)
Assigned to SAMSUNG SDI CO., LTD., Yongin-si (KR); and UNIST(ULSAN NATIONAL INSTITUTE OF SCIENCE AND TECHNOLOGY), Ulsan (KR)
Filed by Samsung SDI Co., Ltd., Yongin-si (KR); and UNIST(ULSAN NATIONAL INSTITUTE OF SCIENCE AND TECHNOLOGY), Ulsan (KR)
Filed on Mar. 4, 2021, as Appl. No. 17/192,711.
Claims priority of application No. 10-2020-0027983 (KR), filed on Mar. 5, 2020.
Prior Publication US 2021/0280866 A1, Sep. 9, 2021
Int. Cl. H01M 4/525 (2010.01); C01G 53/00 (2006.01); H01M 4/02 (2006.01); H01M 4/04 (2006.01); H01M 4/505 (2010.01); H01M 10/0525 (2010.01)
CPC H01M 4/525 (2013.01) [C01G 53/50 (2013.01); H01M 4/04 (2013.01); H01M 4/505 (2013.01); H01M 10/0525 (2013.01); C01P 2002/72 (2013.01); C01P 2002/74 (2013.01); C01P 2004/03 (2013.01); C01P 2004/04 (2013.01); C01P 2004/24 (2013.01); C01P 2004/64 (2013.01); C01P 2004/80 (2013.01); C01P 2006/40 (2013.01); H01M 2004/028 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A composite positive electrode active material for a lithium secondary battery, comprising:
a nickel-based active material; and
a cobalt-boron compound-containing coating layer formed on a surface of the nickel-based active material,
wherein the cobalt-boron compound-containing coating layer comprises an amorphous cobalt-boron compound,
wherein the oxidation number of cobalt in the cobalt-boron compound-containing coating layer is +2+α (−1<α<1).