Positive active material for lithium secondary battery, manufacturing method thereof, lithium secondary battery electrode, and lithium secondary battery

摘要

A positive active material for a lithium secondary battery contains a lithium-transition metal composite oxide represented by a composition formula of Li 1+± Me 1-± O 2 (Me is a transition metal element including Co, Ni, and Mn; 1.2 < (1 + ±)/(1 - ±) < 1.6). A molar ratio (Co/Me) of Co contained in the Me ranges from 0.24 to 0.36, and when a space group R3-m is used for a crystal structure model based on an X-ray diffraction pattern, a half width of a diffraction peak that attributes to a (003) line ranges from 0.204° to 0.303°, or a half width of a diffraction peak that attributes to a (104) line ranges from 0.278° to 0.424°.