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|1. (WO2016053056) POSITIVE ELECTRODE ACTIVE MATERIAL FOR LITHIUM SECONDARY BATTERY, PREPARATION METHOD FOR SAME, AND LITHIUM SECONDARY BATTERY COMPRISING SAME|
|Applicants:||LG CHEM, LTD.
|Inventors:||KANG, Min Suk
JO, Chi Ho
RYU, Ji Hoon
SHIN, Sun Sik
JUNG, Wang Mo
|Title:||POSITIVE ELECTRODE ACTIVE MATERIAL FOR LITHIUM SECONDARY BATTERY, PREPARATION METHOD FOR SAME, AND LITHIUM SECONDARY BATTERY COMPRISING SAME|
The present invention relates to a positive electrode active material for a lithium secondary battery, a preparation method for same, and a lithium secondary battery comprising same, the positive electrode active material comprising: lithium cobalt oxide particles; and a surface treatment layer positioned on the surface of the lithium cobalt oxide particles. The lithium cobalt oxide particles comprise on the surface thereof lithium cobalt oxide, with lithium deficiency, having Li/Co of which the mole ratio is less than 1, belonging to a space group of Fd-3m and having a cubic crystal structure. The surface treatment layer comprises a lithium compound comprising transition metal and one or more elements selected from the group consisting of elements of group 13. Therefore, a side reaction with an electrolyte solution is prevented, a high capacity as well as improved rate properties and initial capacity are shown due to high packing density, and excellent output properties and life are shown due to excellent lithium conductivity.