Lithium manganese oxide spinel compound and method of preparing same

A lithium manganese oxide with a spinel structure and having the formula:

• Li1+XMn2−YM1m1M2m2 . . . MkmkO4+Z
• wherein:
• M1, M2, . . . Mk are cations different than lithium or manganese selected from the group consisting of alkaline earth metals, transition metals, B, Al, Si, Ga and Ge;
• X, Y, m1, m2, . . . mk, each have a value greater than or equal to 0 and less than or equal to 0.2;
• Z has a value greater than or equal to −0.1 and less than or equal to 0.2;
• and
• X, Y, m1, m2, . . . mk are selected to satisfy the equation:
• Y=X+m1+m2+ . . . +mk
• and wherein the tap density is greater than 1.9 g/cm3, the pellet density is greater than about 2.85 g/cm3, the specifilc area is less than 0.8 m2/g, and the full width at half maximum of x-ray diffraction peaks from planes (400) and (440) using CuaKα rays is less than about 0.15°-theta.