Sk on Co., Ltd.

Hee Jun Kweon

Ji Hoon Choi

Jik Soo Kim

Sang Bok Kim

Jeong Bae Yoon

Sung Soon Park

A cathode active material for a lithium secondary battery of embodiments of the present invention includes a lithium composite oxide, a first coating part formed on a surface of the lithium composite oxide and containing aluminum, and a second coating part formed on the first coating part and containing boron. Thereby, stability and electrical characteristics of the secondary battery may be improved.

Cathode active material for lithium secondary battery, lithium secondary battery and method of manufacturing the same

A cathode active material for a lithium secondary battery has a structure of a lithium-nickel-based metal oxide. A crystal size in a (104) plane defined by Equation 1 is less than 200 nm. A thickness of a TM slab measured by a Rietveld method in a crystal structure of a space group R-3m by an X-ray diffraction (XRD) analysis is 2.15 Å or less. A thickness of a Li slab thickness measured by the Rietveld method in the crystal structure of the space group R-3m by the XRD analysis is 2.585 Å or more.

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Daejeon, South Korea

Hee Jun Kweon