US 12,444,742 B2
Positive electrode active material and lithium secondary battery including the same
Ra Na Lim, Cheongju-si (KR); A Reum Yang, Cheongju-si (KR); Gyun Joong Kim, Cheongju-si (KR); Kyung Min Lim, Cheongju-si (KR); and Hye Bin Kim, Cheongju-si (KR)
Assigned to ECOPRO BM CO., LTD., Cheongju-si (KR)
Filed by ECOPRO BM CO., LTD., Cheongju-si (KR)
Filed on Apr. 28, 2023, as Appl. No. 18/309,018.
Application 18/309,018 is a continuation of application No. PCT/KR2021/016129, filed on Nov. 8, 2021.
Claims priority of application No. 10-2020-0168858 (KR), filed on Dec. 4, 2020; application No. 10-2021-0067237 (KR), filed on May 25, 2021; application No. 10-2021-0080132 (KR), filed on Jun. 21, 2021; application No. 10-2021-0080133 (KR), filed on Jun. 21, 2021; application No. 10-2021-0138123 (KR), filed on Oct. 18, 2021; application No. 10-2021-0144259 (KR), filed on Oct. 27, 2021; and application No. 10-2021-0145310 (KR), filed on Oct. 28, 2021.
Prior Publication US 2023/0268497 A1, Aug. 24, 2023
Int. Cl. H01B 1/08 (2006.01); C01G 45/1228 (2025.01); C01G 53/50 (2025.01); H01M 4/131 (2010.01); H01M 4/36 (2006.01); H01M 4/505 (2010.01); H01M 4/525 (2010.01); H01M 10/052 (2010.01); H01M 4/02 (2006.01)
CPC H01M 4/525 (2013.01) [C01G 45/1228 (2013.01); C01G 53/50 (2013.01); H01B 1/08 (2013.01); H01M 4/131 (2013.01); H01M 4/366 (2013.01); H01M 4/505 (2013.01); H01M 10/052 (2013.01); C01P 2002/01 (2013.01); C01P 2004/04 (2013.01); C01P 2006/40 (2013.01); H01M 2004/021 (2013.01); H01M 2004/028 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A positive electrode active material, comprising:
an overlithiated lithium manganese-based oxide comprising at least lithium, nickel and manganese,
in which a phase belonging to a C2/m space group and a phase belonging to an R3-m space group coexist in the lithium manganese-based oxide,
wherein, in the lithium manganese-based oxide, there are regions in which a proportion of the phase belonging to the C2/m space group and the phase belonging to the R3-m space group are different,
wherein a concentration of a metal element in the lithium manganese-based oxide satisfies Expression 2 below:
0.40≤M2′/M1′≤0.70  [Expression 2]
wherein,
M1′ is the number of moles of all metal elements (excluding lithium) in the phase belonging to the R3-m space group, and
M2′ is the number of moles of nickel based on all metal elements (excluding lithium) in the phase belonging to the R3-m space group.