Lithium manganese composite oxide and method for preparing same

摘要

The present invention relates to a lithium manganese composite oxide and a method for preparing the same, and more particularly, to a lithium manganese composite oxide and a method for preparing same, in which a wet-milling process and a spray-drying process are applied, and the abundance ratio of Mn3+ ions to Mn4+ ions at the surface of the composite oxide is adjusted by controlling an oxidizing atmosphere during heat treatment.

主权项

1. A lithium manganese composite oxide comprising a compound represented by chemical formula 1,
wherein the compound represented by chemical formula 1 comprises Mn having an oxidation number of +3 and Mn having an oxidation number of +4, and the abundance ratio of Mn having an oxidation number of +3 to Mn having an oxidation number of +4 at the surface of the lithium manganese composite oxide, A, defined by relation formula 1, is 95 to 100:
Li1+aMn2−xMxO4  [Chemical Formula 1] wherein, a is 0 to 0.2, x is 0 to 0.4, and M is selected from the group consisting of Al, Mg, Zr, Cu, Ni, Sn, Sr, Zn, Si and a mixture thereof; and
A={Mn having an oxidation number of +4 abundance/(Mn having an oxidation number of +3 abundance Mn having an oxidation number of +4 abundance) }×100  [Relation Formula 1].