Battery Material
AssigneeJohnson Matthey Public Limiited Company
InventorYang Liu
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Abstract
The present invention provides a lithium metal oxide composition, a method of synthesis of said composition, an electrode and a battery incorporating said composition, and a use of said composition. The lithium metal oxide composition has a cation-disordered rock salt structure, and a non-stoichiometric composition such that lithium vacancies are present in the material. The lithium metal oxide composition has a general formula: Li1+xM′yM1-x-y-βO2, wherein M comprises a transition metal element, M′ comprises a redox-inactive d0 element, and wherein 0<x≤0.7, 0<y≤0.7, and 0<β≤0.1. Such materials may provide satisfactory, improved, or excellent electrochemical performance at relatively low cost, and without the need for fluorination.
Claims22
A lithium metal oxide composition having a general formula:
- Li1+xM′yM1-x-y-βO2, wherein M comprises a transition metal element, M′ comprises a redox-inactive d0 element, wherein:
- 0<x≤0.7,
- 0<y≤0.7,
- 0<β≤0.1
- and wherein the lithium metal oxide has a cation-disordered rock salt structure.
The lithium metal oxide composition according to any one of the preceding claims wherein M consists of one or more transition metal elements, and wherein M′ consists of one or more redox-inactive d0 elements.
The lithium metal oxide composition according to any one of the preceding claims, wherein M is selected from the group consisting of Ni, Co, Mn, Cr, Fe and any combination thereof.
The lithium metal oxide composition according to any one of the preceding claims wherein M′ is selected from the group consisting of Ti, Nb, Mo, V, Zr, and any combination thereof.
The lithium metal oxide composition according to any one of the preceding claims wherein the material contains substantially no fluorine.
The lithium metal oxide composition according to any one of the preceding claims, wherein the composition has the general formula Li1+xNbyMn1-x-y-βO2, or Li1+xTiyMn1-x-y-βO2.
The lithium metal oxide composition according to any one of the preceding claims wherein the energy density of the lithium metal oxide material is greater than 800 Wh/kg.
The lithium metal oxide composition according to any one of the preceding claims wherein the 1st coulombic efficiency (1st discharge capacity/1st charge capacity) is greater than 70%
A method of synthesis of a lithium metal oxide composition according to any one of the preceding claims, wherein the method includes steps of:
- providing one or more precursor materials, and mixing the precursor materials to form a precursor material mixture;
- calcining the precursor material mixture to form the lithium metal oxide composition.
The method according to claims wherein calcination is performed in a gaseous atmosphere, the gas being selected from air, N2, Ar, He, CO2, CO, O2, H2, and mixtures thereof.
Dependencies are inferred from the claim text.