Patent ID: 7258821

Claim:
A method of producing a positive electrode-active material comprising the steps: a. mixing salts of four different metals selected from the group consisting of Ba, Mg, Ca, Sc, Ti, V, Cr, Mn, Fe, Ni, Co, Cu, Zn, Al, B, Si, Ga, Ge, As, Zr, Hf, Mo, W, Re, Ru, Rh, Pt, Ag, Os, Ir, Au, Sn, and lanthanides, into solution in a liquid solvent, wherein Mn is one of the four metals and is present in an amount of at least about 70 mol percent of the combined amount of the four metals; b. precipitating a homogeneous mixture of the four metals from the solution; c. adding lithium to the homogeneous precipitated mixture; and d. calcining the mixture of lithium and the four different metals in the presence of oxygen to form a lithiated composite oxide of the four metals.