Patent ID: 6964828

Claim:
A cathode composition for a lithium-ion battery having the formula Li[M 1 (1−x) Mn x ]O 2 where (a) 0<x<0.5 or (b) 0.5<x<1, and M 1 represents one or more metal elements, with the proviso that M 1 is a metal element other than chromium, and when M 1 includes nickel, cobalt, or a combination thereof, all of the nickel has an oxidation state of +2 in air, all of the cobalt has an oxidation state of +3 in air, and all of the manganese has an oxidation state of +4 in air, said composition characterized as being in the form of a single phase having an O3 crystal structure that does not undergo a phase transformation to a spinel crystal structure when incorporated in a lithium-ion battery and cycled for 100 full charge-discharge cycles at 30° C. and a final capacity of 130 mAh/g using a discharge current of 30 mA/g.