US 12,294,084 B2
Positive active material for rechargeable lithium battery, preparing method thereof and rechargeable lithium battery including the same
Pilsang Yun, Yongin-si (KR); Hyunbeom Kim, Yongin-si (KR); Sangin Park, Yongin-si (KR); and Yongchan You, Yongin-si (KR)
Assigned to Samsung SDI Co., Ltd., Yongin-si (KR)
Filed by Samsung SDI Co., Ltd., Yongin-si (KR)
Filed on Nov. 9, 2021, as Appl. No. 17/454,209.
Claims priority of application No. 10-2021-0013499 (KR), filed on Jan. 29, 2021.
Prior Publication US 2022/0255072 A1, Aug. 11, 2022
Int. Cl. H01M 4/525 (2010.01); H01M 4/04 (2006.01); H01M 4/505 (2010.01); H01M 10/0525 (2010.01); H01M 4/02 (2006.01)
CPC H01M 4/525 (2013.01) [H01M 4/0471 (2013.01); H01M 4/505 (2013.01); H01M 10/0525 (2013.01); H01M 2004/028 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A positive active material for a rechargeable lithium battery, the positive active material comprising:
a lithium nickel-based metal composite oxide;
a secondary particle, in which a plurality of primary particles are aggregated;
a first boron coating portion on an outer surface of the secondary particle; and
a second boron coating portion on surfaces of the primary particles inside the secondary particle,
wherein a weight of the first boron coating portion is greater than a weight of the second boron coating portion, and
wherein a content of the second boron coating portion is about 10 ppm to about 500 ppm based on the positive active material.