Patent ID: 7763386

Claim:
A cathode active material comprising: a mixture of a first cathode material and a second cathode material, wherein said first cathode material is Li x Ni 1-y-z Co y M z O 2 with “x” being 0.9≦x≦1.10, “y” being 0.05≦y≦0.50, “z” being 0.01≦z≦0.10, and M being one or more elements from the group consisting of Fe, Zn, Al, Sn, Cr, V, Ti, Mg and Ga, wherein said second cathode material is Li s Ni 1-t-u Mn t M′ u O 2 with “s” being 0.9≦s≦1.10, “t” being 0.05≦t≦0.50, “u” being 0.01≦u≦0.30, and M′ being one or more elements from the group consisting of Fe, Zn, Al, Sn; Cr, V, Ti, Mg and Ga, wherein said mixture is 15% by weight or more of said first cathode material to 85% by weight or less of said second cathode material.