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.
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