Layered cathode materials for lithium ion rechargeable batteries
AssigneeThe University of Chicago
InventorsSun-Ho Kang, Khalil Amine
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Abstract
A number of materials with the composition Li1+xNiαMnβCoγM′δO2−zFz (M′=Mg,Zn,Al,Ga,B,Zr,Ti) for use with rechargeable batteries, wherein x is between about 0 and 0.3, α is between about 0.2 and 0.6, β is between about 0.2 and 0.6, γ is between about 0 and 0.3, δ is between about 0 and 0.15, and z is between about 0 and 0.2. Adding the above metal and fluorine dopants affects capacity, impedance, and stability of the layered oxide structure during electrochemical cycling.
Claims20
A positive electrode material of substituted lithium nickel-manganese oxides for a non-aqueous lithium cell, comprising a composition of Li1+xNiαMnβCoγM′δO2−zXz wherein M′ is selected from the group consisting essentially of Mg, Zn, Al, Ga, B, Zr, and Ti, wherein X is selected from the group consisting essentially of F, Cl and I, wherein x is between a value greater than 0 and about 0.333, α is between about 0.2 and 0.6, β is between about 0.2 and 0.667, γ is between a value greater than 0 and about 0.333, δ is between a value greater than 0 and about 0.2, and z is between a value greater than 0 and about 0.5.
A non-aqueous lithium cell comprising:
- a negative electrode;
- a non-aqueous electrolyte;
- and
- a positive electrode,
- wherein the positive electrode has a composition of Li1+xNiaMnbCocM′δO2−zXz wherein M′ is selected from the group consisting essentially of Mg, Zn, Al, Ga, B, Zr, and Ti, wherein X is selected from the group consisting essentially of F, Cl and I, wherein x is between a value greater than 0 and about 0.333, α is between about 0.2 and 0.6, b is between about 0.2 and 0.667, c is between a value greater than 0 and about 0.333, δ is between a value greater than 0 and about 0.2, and z is between a value greater than 0 and about 0.5, and wherein oxidation states of Ni, Mn, and Co are Ni2+, Mn4+, and Co3+, respectively.
A positive electrode material made of substituted lithium nickel-manganese oxides for non-aqueous lithium cell, comprising:
- a composition of Li1+xNiαMnβCocM′δO2−zXz, wherein M′ is selected from the group consisting essentially of Mg, Zn, Al, Ga, B, Zr and Ti wherein X is selected from the group consisting essentially of F, Cl and I, wherein x, α, β, c, δ, and z are a value greater than 0 and are controlled so as to fix the oxidation states of Ni, Mn, and Co as Ni2+, Mn4+, and Co3+, respectively.
A positive active material for a secondary lithium cell, comprising:
- a core comprising at least one composition of Li1+xNiαMnβCoγM′δO2−zXz wherein M′ is selected from the group consisting essentially of Mg, Zn, Al, Ga, B, Zr, and Ti, wherein X is selected from the group consisting essentially of F, Cl and I, wherein x is between a value greater than 0 and about 0.333, α is between about 0.2 and 0.6, β is between about 0.2 and 0.667, γ is between a value greater than 0 and about 0.333, δ is between a value greater than 0 and about 0.2, and z is between a value greater than 0 and about 0.5;
- and
- either a surface layer or a surface phase on the core, comprising at least one surface coating material from a coating material source selected from the group consisting of alkoxides, hydroxides, oxides and mixtures thereof,
- wherein the surface-coated compound is heat-treated to form hydroxides or amorphous oxides on the compound surface.
Dependencies are inferred from the claim text.