LITHIUM MANGANESE POSITIVE ELECTRODE ACTIVE MATERIAL HAVING SPINEL STRUCTURE, AND POSITIVE ELECTRODE AND LITHIUM SECONDARY BATTERY COMPRISING SAME

WIPO Patent Application WO/2019/088805

A2

The present invention relates to a lithium manganese positive electrode active material having a spinel structure, a positive electrode and a lithium secondary battery comprising same, the lithium manganese positive electrode active material comprising: lithium manganese oxide represented by chemical formula [1] below; and a coating layer which is positioned on the surface of the lithium manganese oxide and comprises one or more coating elements selected from the group consisting of Al, Ti, W, B, F, P, Mg, Ni, Co, Fe, Cr, V, Cu, Ca, Zn, Zr, Nb, Mo, Sr, Sb, Bi, Si, and S, and thus showing excellent high-temperature storage characteristics. Chemical formula [1]: Li1+aMn2-bM1 bO4-cAc (In chemical formula [1], M1 is one or more metal elements comprising Li, A is one or more elements selected from the group consisting of F, Cl, Br, I, At and S, 0≤a≤0.2, 0