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A cathode composition for a lithium-ion battery having the formula Li[M1(1?x)Mnx]O2 where 0<x<1 and M1 represents one or more metal elements, with the proviso that M1 is a metal element other than chromium. The composition is in the form of a single phase having an O3 crystal structure that do

A cathode composition for a lithium-ion battery having the formula Li[M1(1?x)Mnx]O2 where 0<x<1 and M1 represents one or more metal elements, with the proviso that M1 is a metal element other than chromium. The composition is 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.

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1. A cathode composition for a lithium-ion battery having the formula Li[M1(1?x)Mnx]O2 where (a) 0<x<0.5 or (b) 0.5<x<1, and M1 represents one or more metal elements, with the proviso that M1 is a metal element other than chromium, and when M1 includes nickel, cobalt, or a combination th

1. A cathode composition for a lithium-ion battery having the formula Li[M1(1?x)Mnx]O2 where (a) 0<x<0.5 or (b) 0.5<x<1, and M1 represents one or more metal elements, with the proviso that M1 is a metal element other than chromium, and when M1 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. 2. A cathode composition according to claim 1 wherein M1 is selected from the group consisting of Ni, Co, Fe, Cu, Li, Zn, V, and combinations thereof.3. A cathode composition according to claim 1 wherein x=(2?y)/3 and M1(1?x) has the formula Li(1?2y)/3M2y, where 0<y<0.5 and M2 represents one or more metal elements, with the proviso that M2 is a metal element other than chromium, and when M2 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 cathode composition having the formula Li[Li(1?2y)/3M2yMn(2?y)/3]O2. 4. A cathode composition according to claim 3 wherein 0.083<y<0.5.5. A cathode composition according to claim 3 wherein 0.167<y<0.5.6. A cathode composition according to claim 3 wherein M2 is a single metal element.7. A cathode composition according to claim 6 wherein M2 is Ni.8. A cathode composition according to claim 1 wherein x=(2?2y)/3 and M1(1?x) has the formula Li(1?y)/3M3y, where 0<y<0.5 and M3 represents one or more metal elements, with the proviso that M3 is a metal element other than chromium, and when M3 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 cathode composition having the formula Li[Li(1?y)/3M3yMn(2?2y)/3]O2. 9. A cathode composition according to claim 8 wherein 0.083<y<0.5.10. A cathode composition according to claim 8 wherein 0.167<y<0.5.11. A cathode composition according to claim 8 wherein M3 is a single metal element.12. A cathode composition according to claim 11 wherein M3 is Co.13. A cathode composition according to claim 1 wherein x=y and M1(1?x) has the formula M4yM51?2y, where 0<y<0.5, M4 is a metal element other than chromium, and M5 is a metal element other than chromium that is different from M4, and when M4, M5, or both 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 cathode composition-having the formula Li[M4yM51?2yMny]O2. 14. A cathode composition according to claim 13 wherein 0.083<y<0.5.15. A cathode composition according to claim 13 wherein 0.167<y<0.5.16. A cathode composition according to claim 13 wherein M4 is Ni.17. A cathode composition according to claim 13 wherein M5 is Co.18. A cathode composition according to claim 13 wherein M4 is Ni and M5 is Co.19. A lithium-ion battery comprising:(a) an anode; (b) a cathode according to claim 1, 3, 8, or 13; and (c) an electrolyte separating said anode and said cathodes.