LITHIUM COBALT OXIDE FOR LITHIUM SECONDARY BATTERY, PREPARING METHOD THEREOF, AND LITHIUM SECONDARY BATTERY INCLUDING POSITIVE ELECTRODE COMPRISING THE SAME

摘要

Disclosed are: a lithium cobalt composite oxide for a lithium secondary battery represented by chemiacal formula 1, having a polycrystalline state; a preparing method thereof; and a lithium secondary battery having a positive electrode comprising the lithium cobalt composite oxide. In chemical formula 1, Li_aCo_bO_c, a is an integer from 0.9 to 1.1, b is an integer from 0.980 to 1.0000, and c is an integer from 1.9 to 2.1.