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AssigneeEnvia Systems, Inc.
InventorsHerman A. Lopez, Subramanian Venkatachalam, Deepak Kumaar Kandasamy Karthikeyan, Sujeet Kumar
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Lithium rich and manganese rich lithium metal oxides are described that provide for excellent performance in lithium-based batteries. The specific compositions can be engineered within a specified range of compositions to provide desired performance characteristics. Selected compositions can provide high values of specific capacity with a reasonably high average voltage. Compositions of particular interest can be represented by the formula, x Li2MnO3.(1−x) Li Niu+ΔMnu−ΔCowAyO2). The compositions undergo significant first cycle irreversible changes, but the compositions cycle stably after the first cycle.
A positive electrode active material for a lithium ion battery having a room temperature specific discharge capacity from 4.6V to 2V of at least about 210 mAh/g at a discharge rate of C/10 and an irreversible capacity loss of no more than about 60 mAh/g, and comprising a layered lithium metal oxide composition approximately represented by the formula x Li2MnO3.(1−x) Li Niu+ΔMnu−ΔCowAyO2, x is at least about 0.2 and no more than about 0.325, the absolute value of Δ is no more than about 0.3, 2u+w+y is approximately equal to 1, w is in the range from 0 to 1, u is in the range from 0.2 to 0.5 and y is no more than about 0.1, with the proviso that both (u+Δ) and w are not zero, wherein an optional fluorine dopant can replace no more than about 10 mole percent of the oxygen.
A positive electrode active material for a lithium ion cell comprising a layered lithium metal oxide composition approximately represented by the formula Li1+bNiαMnβCoγAδO2−zFz, where b ranges from about 0.091 to about 0.14, α ranges from 0.1 to about 0.4, β range from about 0.2 to about 0.65, γ ranges from 0 to about 0.46, δ ranges from about 0 to about 0.15 and z ranges from 0 to 0.2, and where A is Mg, Sr, Ba, Cd, Zn, Al, Ga, B, Zr, Ti, Ca, Ce, Y, Nb, Cr, Fe, V, Li or combinations thereof, and having a stabilization coating, wherein when discharged at room temperature at a discharge rate of C/10 the positive electrode active material has a specific discharge capacity of at least about 215 mAh/g from 4.6V to 2V.
A method for synthesizing a positive electrode active composition, the method comprising:
Dependencies are inferred from the claim text.