US 11,901,552 B2
Positive active material for lithium secondary battery and lithium secondary battery comprising same
Kwon Young Choi, Seoul (KR); Jong Il Park, Pohang-si (KR); Sang Cheol Nam, Seoul (KR); and Sang Hyuk Lee, Incheon (KR)
Assigned to POSCO HOLDINGS INC., Seoul (KR); RESEARCH INSTITUTE OF INDUSTRIAL SCIENCE & TECHNOLOGY, Pohang-si (KR); and POSCO FUTURE M CO., LTD., Pohang-si (KR)
Appl. No. 16/770,248
Filed by POSCO HOLDINGS INC., Seoul (KR); RESEARCH INSTITUTE OF INDUSTRIAL SCIENCE & TECHNOLOGY, Pohang-si (KR); and POSCO FUTURE M CO., LTD., Pohang-si (KR)
PCT Filed Dec. 7, 2018, PCT No. PCT/KR2018/015537
§ 371(c)(1), (2) Date Jun. 5, 2020,
PCT Pub. No. WO2019/112375, PCT Pub. Date Jun. 13, 2019.
Claims priority of application No. 10-2017-0168545 (KR), filed on Dec. 8, 2017.
Prior Publication US 2020/0388842 A1, Dec. 10, 2020
Int. Cl. H01M 4/131 (2010.01); H01M 4/525 (2010.01); H01M 4/36 (2006.01); H01M 4/505 (2010.01); H01M 10/0525 (2010.01); H01M 4/02 (2006.01)
CPC H01M 4/525 (2013.01) [H01M 4/131 (2013.01); H01M 4/366 (2013.01); H01M 4/505 (2013.01); H01M 10/0525 (2013.01); H01M 2004/021 (2013.01); H01M 2004/028 (2013.01)] 16 Claims
 
1. A positive active material for a lithium rechargeable battery, comprising:
a nickel-based lithium metal oxide particle doped with Zr and Al; and
a coating layer disposed on the surface of the nickel-based lithium metal oxide particle,
wherein
the nickel-based lithium metal oxide particle includes
a core portion, and
a shell portion surrounding the core portion and forming a concentration gradient in which a concentration of nickel gradually decreases from an interface with the core portion toward an outer direction,
the coating layer includes an oxyhydroxide of a rare earth element, wherein the rare earth element is cerium (Ce),
the nickel-based lithium metal oxide particle includes:
a first particle having an average particle diameter of 10 μm to 30 μm, and
a second particle having an average particle diameter of 1 μm to 6 μm,
a molar ratio of Zr:Al in the nickel-based lithium metal oxide particles is 10:1 to 2:1.