Patent ID: 7435402

Claim:
A method of preparing a mixed nickel-cobalt-manganese carbonate comprising the steps of: dissolving in distilled water about 0.01M to about 2M of a metal solution comprising: a nickel compound selected from the group consisting of Ni-acetate, Ni-nitrate, Ni-sulfate and combinations thereof; a cobalt compound selected from the group consisting of Co-acetate, Co-nitrate, Co-sulfate, and combinations thereof; and a manganese compound chosen from the group consisting of Mn-acetate, Mn-nitrate, Mn-sulfate, and combinations thereof; adding the metal solution to an aqueous solution of about 0.1M to about 5M of a carbonate chosen from the group consisting of ammonium hydrogen carbonate, sodium carbonate and combinations thereof; aging the precipitates in the solution at a temperature increased from about 20° C. to about 65° C. wherein the solution is reacted at each temperature for about 1 h to about 24 h.