US 12,068,478 B2
Positive electrode active material for lithium secondary battery, method of preparing the same and lithium secondary battery including the same
Chi Ho Jo, Daejeon (KR); Ji Hoon Ryu, Daejeon (KR); Min Suk Kang, Daejeon (KR); Sun Sik Shin, 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 Apr. 6, 2021, as Appl. No. 17/223,355.
Application 17/223,355 is a continuation of application No. 15/515,728, granted, now 10,998,548, previously published as PCT/KR2015/010447, filed on Oct. 2, 2015.
Claims priority of application No. 10-2014-0133428 (KR), filed on Oct. 2, 2014; application No. 10-2014-0133429 (KR), filed on Oct. 2, 2014; and application No. 10-2015-0138746 (KR), filed on Oct. 1, 2015.
Prior Publication US 2021/0226210 A1, Jul. 22, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. H01M 4/525 (2010.01); C01G 51/00 (2006.01); H01M 4/36 (2006.01); H01M 10/052 (2010.01); H01M 10/0525 (2010.01)
CPC H01M 4/525 (2013.01) [C01G 51/42 (2013.01); H01M 4/366 (2013.01); H01M 10/0525 (2013.01); C01P 2002/50 (2013.01); C01P 2002/76 (2013.01); C01P 2002/85 (2013.01); C01P 2004/04 (2013.01); C01P 2004/61 (2013.01); C01P 2006/40 (2013.01); H01M 10/052 (2013.01); H01M 2220/20 (2013.01); Y02E 60/10 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A positive electrode active material for a lithium secondary battery, comprising a lithium cobalt oxide particles,
wherein the lithium cobalt oxide particle has a core-shell structure comprising a core part and a shell part provided on a surface of the core part,
wherein the lithium cobalt oxide particles comprises lithium deficient lithium cobalt oxide on a surface of a particle and in a region corresponding to a distance from 0% to less than 100% from the surface of the particle relative to a distance (r) from the surface to the center of the particle, the lithium deficient lithium cobalt oxide having a Li/Co molar ratio of less than 1, belongs to an Fd-3m space group, and having a cubic crystal structure, and
wherein the shell part comprises first lithium cobalt oxide of the following Formula 1, and
the core part comprises second lithium cobalt oxide of the following Formula 2, wherein the positive electrode active material has a monolith structure with an average particle diameter from 3 to 50 μm:
Li1−aCOMxO2  [Formula 1]
LibCOM′yO2  [Formula 2]
in Formula 1 and 2, M and M′ each independently comprises at least one metal element selected from the group consisting of W, Mo, Zr, Ti, Mg, Ta, Al, Fe, V, Cr, Ba, Ca, and Nb, and a, b, x, and y satisfies the following relations of 0<a≤0.05, 1≤b≤1.2, 0≤x≤0.02, and 0≤y≤0.02.