US 12,040,484 B2
Positive electrode active material for secondary battery, method for preparing the same and lithium secondary battery comprising the same
Gi Beom Han, Daejeon (KR); Sang Min Park, Daejeon (KR); Ji Hye Kim, Daejeon (KR); Tae Gu Yoo, Daejeon (KR); and Wang Mo Jung, Daejeon (KR)
Assigned to LG Energy Solution, Ltd., Seoul (KR)
Filed by LG Chem, Ltd., Seoul (KR)
Filed on Oct. 18, 2019, as Appl. No. 16/657,275.
Claims priority of application No. 10-2018-0129162 (KR), filed on Oct. 26, 2018.
Prior Publication US 2020/0136141 A1, Apr. 30, 2020
Int. Cl. H01M 4/505 (2010.01); H01M 4/02 (2006.01); H01M 4/04 (2006.01); H01M 4/36 (2006.01); H01M 4/525 (2010.01); H01M 10/0525 (2010.01)
CPC H01M 4/505 (2013.01) [H01M 4/0471 (2013.01); H01M 4/366 (2013.01); H01M 4/525 (2013.01); H01M 10/0525 (2013.01); H01M 2004/028 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A positive electrode active material for a secondary battery, the positive electrode active material is a lithium composite transition metal oxide represented by the following formula:
LipNi1−(x1+y1+z1)Cox1Mny1Maz1O2+δ  [Formula 1]
wherein, Ma is at least one selected from the group consisting of Al, Zr, Ti, Mg, Ta, Nb, Mo, Cr, Ba, Sr, and Ca, 1≤p≤1.3, 0<x1≤0.5, 0<y1<0.5, 0≤z1≤0.1, and −0.1≤δ≤1,
wherein a particle of the lithium composite transition metal oxide comprises a core portion and a resistance portion formed on a surface of the core portion, and is composed of a single particle, and
wherein the core portion has a layered crystal structure of space group R-3m, and the resistance portion has a cubic rock-salt structure of space group Fm-3m.