US 12,451,484 B2
Positive electrode active material for lithium secondary battery, method for preparing the same, and lithium secondary battery including the same
Moon Ho Choi, Cheongju-si (KR); Gyeong Jae Heo, Cheongju-si (KR); Seung Hyun Choi, Cheongju-si (KR); A Reum Yang, Cheongju-si (KR); and Ju Kyoung Kang, Cheongju-si (KR)
Assigned to ECOPRO BM CO., LTD., Cheongju-si (KR)
Filed by ECOPRO BM CO., LTD., Cheongju-si (KR)
Filed on Oct. 16, 2020, as Appl. No. 17/072,721.
Claims priority of application No. 10-2019-0130033 (KR), filed on Oct. 18, 2019; and application No. 10-2020-0051074 (KR), filed on Apr. 27, 2020.
Prior Publication US 2021/0119208 A1, Apr. 22, 2021
Int. Cl. H01M 4/525 (2010.01); H01M 4/02 (2006.01); H01M 4/04 (2006.01); H01M 4/131 (2010.01); H01M 4/134 (2010.01); H01M 4/1391 (2010.01); H01M 4/1395 (2010.01); H01M 4/36 (2006.01); H01M 4/505 (2010.01); H01M 10/052 (2010.01)
CPC H01M 4/525 (2013.01) [H01M 4/0471 (2013.01); H01M 4/131 (2013.01); H01M 4/134 (2013.01); H01M 4/1391 (2013.01); H01M 4/1395 (2013.01); H01M 4/364 (2013.01); H01M 4/366 (2013.01); H01M 4/505 (2013.01); H01M 10/052 (2013.01); C01P 2002/52 (2013.01); C01P 2002/74 (2013.01); C01P 2004/50 (2013.01); C01P 2004/61 (2013.01); C01P 2006/10 (2013.01); C01P 2006/12 (2013.01); H01M 2004/021 (2013.01); H01M 2004/028 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A positive electrode active material for secondary batteries, the positive electrode active material comprising an overlithiated layered oxide (OLO) represented by the following Chemical Formula 1:
rLi2MnO3·(1−r)LiaNixCoyMnzM11-(x+y+z)O2,  Chemical Formula 1
(where 0<r≤0.6, 0<a≤1, 0≤x≤1, 0≤y<1, 0≤z<1, 0<x+y+z<1, and M1 is one or more selected from Ba, Sr, P, Y, Zr, Nb, Mo, Ta, and W)
wherein primary particles are aggregated to form secondary particles,
wherein primary particles having a size in a range of 1 μm to 10 μm are 50 to 100% by volume of the primary particles constituting the secondary particles,
wherein the OLO represented by Chemical Formula 1 is in a solid solution phase in which Li2MnO3 having a monoclinic structure and LiMO2 having a rhombohedral structure are mixed,
where M is one or more selected from Ni, Co, Mn, and M1,
wherein M1 is a dopant material, and
wherein the positive electrode active material includes a material represented by the following Chemical Formula 2:
LiaM1Ob,  Chemical Formula 2
(where 0<a≤7, 0<b≤15, and M1 is one or more selected from Ba, Sr, P, Y, Zr, Nb, Mo, Ta, and W), and
where M1 is included in the OLO represented by Chemical Formula 1 in an amount in a range of from 0.01 mol % to 10 mol %.