Patent ID: 11870070
Assignee: LG ENERGY SOLUTION, LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  C  Y | IPC C  H

Claim 0:
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.