POSITIVE ACTIVE MATERIAL, PREPARING METHOD THEREOF, POSITIVE ELECTRODE FOR LITHIUM SECONDARY BATTERY INCLUDING THE SAME, AND LITHIUM SECONDARY BATTERY EMPLOYING THE SAME

摘要

Provided are a positive active material that has a decreased amount of Li-containing impurities that remain on a lithium transition metal composite oxide surface to decrease an amount of gas generation and has improved lifespan properties, a method of preparing the same, a positive electrode for a lithium secondary battery including the positive active material, and a lithium secondary battery including the same.

主权项

1. A positive active material comprising:
a lithium transition metal composite oxide core; and a coating layer comprising LiF on at least one portion of the surface of the lithium transition metal composite oxide core, wherein the amount of Li-containing impurities that remain on a surface of a lithium transition metal composite oxide core is 0.25 parts by weight or less based on 100 parts by weight of the lithium transition metal composite oxide core.