US 12,438,152 B2
Positive active material precursor for rechargeable lithium battery, positive active material for rechargeable lithium battery, method of preparing the positive active material, and rechargeable lithium battery including the positive active material
Do-Yu Kim, Yongin-si (KR)
Assigned to Samsung SDI Co., Ltd., Yongin-si (KR)
Filed by Samsung SDI Co., Ltd., Yongin-si (KR)
Filed on Aug. 5, 2020, as Appl. No. 16/985,567.
Claims priority of application No. 10-2019-0096750 (KR), filed on Aug. 8, 2019.
Prior Publication US 2021/0043931 A1, Feb. 11, 2021
Int. Cl. H01M 4/525 (2010.01); H01M 4/02 (2006.01); H01M 4/04 (2006.01); H01M 4/505 (2010.01); H01M 4/58 (2010.01); H01M 10/0525 (2010.01)
CPC H01M 4/525 (2013.01) [H01M 4/0416 (2013.01); H01M 4/505 (2013.01); H01M 4/5825 (2013.01); H01M 10/0525 (2013.01); H01M 2004/027 (2013.01); H01M 2004/028 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A positive active material precursor for a rechargeable lithium battery comprising:
a nickel-based composite precursor comprising a secondary particle comprising a plurality of primary particles that are aggregated together,
the nickel-based composite precursor having a central portion and a surface portion, and
the central portion of the nickel-based composite precursor comprising a phosphate between adjacent ones of the plurality of primary particles,
wherein the nickel-based composite precursor of the surface portion is represented by Chemical Formula 2,
a concentration of the phosphate in the central portion of the nickel-based composite hydroxide precursor is higher than a concentration of the phosphate in the surface portion:
NixCoyMnzM1-x-y-z(OH)2  [Chemical Formula 2]
wherein, in Chemical Formula 2,
0.7≤x≤1, 0≤y≤0.5, 0≤z≤0.5, 0.5≤x+y+z≤1, and M is at least one selected from Mn, Ni, Co, Al, Fe, V, Ti, and Cr.