US 11,870,070 B2
Positive electrode active material for secondary battery, method of preparing the same, and lithium secondary battery including the positive electrode active material
So Ra Baek, Daejeon (KR); Min Suk Kang, Daejeon (KR); Sang Wook Lee, Daejeon (KR); Wang Mo Jung, Daejeon (KR); Dong Hun Lee, Daejeon (KR); Hye Lim Jeon, Daejeon (KR); and Eun Sol Lho, Daejeon (KR)
Assigned to LG Energy Solution, Ltd.
Appl. No. 16/771,139
Filed by LG Chem, Ltd., Seoul (KR)
PCT Filed Jan. 23, 2019, PCT No. PCT/KR2019/000970
§ 371(c)(1), (2) Date Jun. 9, 2020,
PCT Pub. No. WO2019/147017, PCT Pub. Date Aug. 1, 2019.
Claims priority of application No. 10-2018-0008909 (KR), filed on Jan. 24, 2018.
Prior Publication US 2021/0151754 A1, May 20, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. H01M 4/525 (2010.01); H01M 4/04 (2006.01); H01M 4/36 (2006.01); H01M 4/505 (2010.01); H01M 10/0525 (2010.01); H01M 4/13915 (2010.01); H01M 4/131 (2010.01); H01M 4/1315 (2010.01); H01M 4/1391 (2010.01); H01M 4/62 (2006.01); C01G 53/00 (2006.01); C01B 35/12 (2006.01); H01M 4/02 (2006.01)
CPC H01M 4/525 (2013.01) [C01B 35/121 (2013.01); C01G 53/50 (2013.01); H01M 4/0471 (2013.01); H01M 4/131 (2013.01); H01M 4/1315 (2013.01); H01M 4/1391 (2013.01); H01M 4/13915 (2013.01); H01M 4/366 (2013.01); H01M 4/505 (2013.01); H01M 4/628 (2013.01); H01M 10/0525 (2013.01); C01P 2004/80 (2013.01); C01P 2006/40 (2013.01); C01P 2006/80 (2013.01); H01M 2004/028 (2013.01); Y02E 60/10 (2013.01)] 6 Claims
 
1. A method of preparing a positive electrode active material for a secondary battery, the method comprising:
preparing a lithium composite transition metal oxide including nickel (Ni), cobalt (Co), and manganese (Mn); and
forming a coating layer by dry mixing the lithium composite transition metal oxide with a coating source including at least one selected from the group consisting of boron (B), aluminum (Al), silicon (Si), titanium (Ti), and phosphorus (P), and performing a heat treatment at a temperature of 500° C. to 750° C.,
wherein, in the lithium composite transition metal oxide, an amount of the nickel (Ni) in a total amount of transition metals is 60 mol % or more, and an amount of the manganese (Mn) is greater than an amount of the cobalt (Co), and
the coating layer comprises a compound represented by Formula 1:
LiaM1bOc  [Formula 1]
wherein, in Formula 1, M1 is at least one selected from the group consisting of B, Al, Si, Ti, and P, and 1≤a≤4, 1≤b≤8, and 1≤c≤20.