Lg Chem, Ltd

Jin Wook Ju

Seung Beom Cho

Hyuck Lee

Sang Soon Choi

Jong Pil Kim

San Su Son

Provided are a method of preparing a positive electrode active material for a secondary battery, in which the positive electrode active material is uniformly doped with various doping elements without worrying about surface damage of the active material and characteristics degradation by including mixing a metal precursor for a positive electrode active material and a raw material including a doping element, in which an average particle diameter ratio is in a range of 5:1 to 2,000:1, using acoustic resonance to prepare a precursor doped with the doping element, and mixing the doped precursor with a lithium raw material and performing a heat treatment, and a positive electrode active material which has improved structure stability by being prepared by the above method and may improve battery characteristics, for example, capacity reduction may be minimized and cycle characteristics may be improved when used in the battery.

Method of preparing positive electrode active material for secondary battery and positive electrode active material for secondary battery prepared thereby

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Daejeon, South Korea

Jin Wook Ju