Patent ID: 7943113

Claim:
A method for preparing lithium-manganese oxides comprising: solid mixing lithium raw material, manganese raw material and metal raw material—metal is expressed as the following chemical formula 1—to manufacture mixture; and heat treating the mixture under reduction atmosphere, Li 1+x Mn 1−x−y M y O 2+z [Chemical Formula 1] wherein 0.01≦x≦0.5, 0≦y≦0.3, −0.2≦z≦0.2, and M is a metal selected from the group consisting of Mn, V, Cr, Co, Ni, Cu, Zn, Zr, Nb, Mo, W, Ag, Sn, Ge, Si, Al, and alloy thereof, and wherein the lithium-manganese oxides have a layered structure.