US 12,322,791 B2
Positive active material for rechargeable lithium battery, preparing method thereof and rechargeable lithium battery including the same
Jungsue Jang, Yongin-si (KR); Donghyun Kil, Yongin-si (KR); Minhan Kim, Yongin-si (KR); Jinyoung Kim, Yongin-si (KR); Jinhwa Kim, Yongin-si (KR); Jihyun Seog, Yongin-si (KR); Jaeha Shim, Yongin-si (KR); Kiyong Ahn, Yongin-si (KR); Donggyu Chang, Yongin-si (KR); Youngjoo Chae, Yongin-si (KR); Aram Choi, Yongin-si (KR); and Jeuk Ha, Yongin-si (KR)
Assigned to Samsung SDI Co., Ltd., Yongin-si (KR)
Filed by SAMSUNG SDI CO., LTD., Yongin-si (KR)
Filed on Mar. 13, 2024, as Appl. No. 18/603,865.
Application 18/603,865 is a continuation of application No. 17/657,316, filed on Mar. 30, 2022.
Claims priority of application No. 10-2021-0069175 (KR), filed on May 28, 2021.
Prior Publication US 2024/0222602 A1, Jul. 4, 2024
Int. Cl. H01M 4/36 (2006.01); C01G 53/40 (2025.01); C01G 53/44 (2025.01); H01M 4/04 (2006.01); H01M 4/505 (2010.01); H01M 4/525 (2010.01); H01M 4/02 (2006.01)
CPC H01M 4/364 (2013.01) [C01G 53/40 (2013.01); C01G 53/44 (2013.01); H01M 4/0471 (2013.01); H01M 4/366 (2013.01); H01M 4/505 (2013.01); H01M 4/525 (2013.01); H01M 2004/021 (2013.01); H01M 2004/028 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A positive active material for a rechargeable lithium battery, comprising:
a first positive active material in a form of secondary particles comprising a plurality of primary particles that are aggregated together, and
a second positive active material having a single particle form,
wherein both of the first positive active material and the second positive active material are nickel-based positive active materials,
each of the first positive active material and the second positive active material is coated with cobalt, and
the second positive active material has protrusions and depressions on the surface of the single particle, and
wherein:
a maximum roughness (Rmax; peak to peak height) of a surface of the second positive active material is greater than or equal to about 15 nm.