US 12,191,488 B2
Positive electrode active material and positive electrode including the same
Eun Sol Lho, Daejeon (KR); Jin Tae Hwang, Daejeon (KR); Su Yeon Oh, Daejeon (KR); Byung Chun Park, Daejeon (KR); Sang Min Park, Daejeon (KR); Sang Wook Lee, Daejeon (KR); Seul Ki Kim, Daejeon (KR); and Hyeong Ii Kim, Daejeon (KR)
Assigned to LG Energy Solution, Ltd., Seoul (KR)
Filed by LG Energy Solution, Ltd., Seoul (KR)
Filed on Dec. 14, 2023, as Appl. No. 18/540,301.
Claims priority of application No. 10-2022-0176301 (KR), filed on Dec. 15, 2022.
Prior Publication US 2024/0213471 A1, Jun. 27, 2024
Int. Cl. H01M 4/525 (2010.01); H01M 4/36 (2006.01); H01M 4/485 (2010.01); H01M 10/052 (2010.01); H01M 4/02 (2006.01)
CPC H01M 4/525 (2013.01) [H01M 4/366 (2013.01); H01M 4/485 (2013.01); H01M 10/052 (2013.01); H01M 2004/028 (2013.01)] 11 Claims
 
1. A positive electrode active material comprising:
a nickel-based lithium composite metal oxide having a Ni content of 80 atm % or greater among transition metals except lithium, wherein the nickel-based lithium composite metal oxide is in a form of a single particle or pseudo-single particle; and
a coating layer positioned on a surface of the nickel-based lithium composite metal oxide, wherein the coating layer includes cobalt,
wherein the positive electrode active material satisfies Equation 1 below:

OG Complex Work Unit Math
wherein, X (mol %) is a number of moles of Co in the coating layer based on 100 moles of the nickel-based lithium composite metal oxide, Y (μm) is an average particle diameter of nodules of the nickel-based lithium composite metal oxide, and Z (μm) is D50 of the positive electrode active material, wherein Z is from 5 μm to 12 μm, and
wherein the nickel-based lithium composite metal oxide is represented by Formula 2 below:

OG Complex Work Unit Chemistry
wherein, M1 is Mn, Al, or a combination thereof, M2 is one or more selected from the group consisting of W, Y, Ba, Ca, Ti, Mg, Ta, and Nb, and 0.8≤a≤1.2, 0.8≤b<1, 0<c<0.2, 0<d<0.2, and 0≤e≤0.1.