Patent ID: 7314684

Claim:
A method for forming an electrode material made of substituted lithium nickel-manganese oxides, comprising the steps of: producing compositions of Li 1+x Ni α Mn β A γ O 2 wherein A is chosen from the group consisting of Mg, Zn, Al, Co, Ga, B, Zr, and Ti, and further wherein x is between about 0 and 0.2, α is between about 0.1 and 0.5, β between about 0.4 and 0.6, and γ between about 0 and about 0.1 through a electrode forming process chosen from the group consisting of a solid-state reaction method, an aqueous solution method, and a sol-gel method; further wherein the solid-state reaction method comprises the steps of: mixing amounts of lithium hydroxide (or lithium carbonate), (Ni,Mn)-hydroxide, and A-hydroxide or A oxide (wherein A is chosen from the group consisting of Mg, Zn, Al, Co, Ga, B, Zr, and Ti) in acetone using zirconia balls for about 12-24 hours to form a mixed powder; calcining the mixed powder at about 450˜550° C. for about 12-30 hours in air; calcining the mixed powder at about 900-1100° C. for about 10-24 hours either in an air or an nitrogen/oxygen atmosphere; and rapidly quenching the calcined powders into liquid nitrogen.