CATHODE ACTIVE MATERIAL COMPRISING LITHIUM MANGANESE OXIDE CAPABLE OF PROVIDING EXCELLENT CHARGE-DISCHARGE CHARACTERISTICS AT 3V REGION as Well as 4V Region

摘要

PURPOSE: A positive electrode active material is provided to improve the low electrochemical performance at 3 V region(2.5-3.5 V). CONSTITUTION: A positive electrode active material comprises lithium manganese oxide as in amorphous status. The positive electrode active material has a spinel structure represented by chemical formula 1. The chemical formula is as follows: Li_(1+y)M_zMn_(2-y-z)O_(4-x)Q_x. In the chemical formula 1, 0=x=1, 0=y=0.3, 0=z=1, M is one or more elements selected from a group consisting of the Al, Mg, Ni, Co, Fe, Cr, V, Ti, Cu, B, Ca, Zn, Zr, Nb, Mo, Sr, Sb, W, Ti and Bi. Q indicates one or more elements selected from a group consisting of N, F, S and Cl.