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AssigneeEnvia Systems, Inc.
InventorsSanjeev Sharma, Subramanian Venkatachalam, Yogesh Kumar Anguchamy, Herman A. Lopez, Sujeet Kumar
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Mixed phase complex lithium metal oxides are described with an overall stoichiometry represented by a formula Li1+aNibCocMndOx, −0.05≦a≦0.14, 0.1≦b≦0.25, 0≦c≦0.2, 0.45≦d≦0.8, a+b+c+d=1 and (1+a)/(b+c+d)≦1.325. The compositions are generally very high in manganese content. The compositions can have x-ray diffractograms and differential capacity profiles suggesting the presence of a layered (Li2MnO3)—layered (LiMetalO2)—spinel crystal structure. The compositions can exhibit surprisingly low first cycle irreversible capacity losses while maintaining high specific discharge capacities, even at high discharge rates. Stabilizing coatings have been found to further significantly improve performance.
A composition having a formula Li1+aNibCocMndMeOx, with −0.05≦a≦0.14, 0.1≦b≦0.25, 0≦c≦0.2, 0.45≦d≦0.8, 0≦e≦0.02, a+b+c+d+e=1, (1+a)/(b+c+d+e)≦1.34 and M is a metal element different from Li, Ni, Co and Mn, wherein the composition exhibits a first cycle irreversible capacity loss in a lithium battery of no more than about 10% of the first charge specific capacity when discharged at C/20 from 4.6V to 2V.
A composition having a formula Li1+aNibCocMndMeOx, −0.05≦a≦0.14, 0.1≦b≦0.25, 0≦c≦0.2, 0.45≦d≦0.8, 0≦e≦0.02, a+b+c+d+e=1, (1+a)/(b+c+d+e)≦1.325 and M is a metal element different from Li, Ni, Co, and Mn, wherein the composition exhibits an X-ray diffractogram indicating the presence of a spinel phase and a 5th cycle discharge specific capacity of at least about 225 mAh/g when discharged at a rate of C/3 from 4.6V to 2V.
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