Sodium ion solid-state conductors with sodium oxoferrate structure
AssigneeInternational Business Machines Corporation
InventorsTeodoro Laino, Valery Weber
Life of this patent
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Abstract
A solid-state conductor with sodium oxoferrate structure is disclosed. The conductor may be used in battery applications where it is preferable to avoid the use of a liquid electrolyte. The conductor may be produced from an initial NaFeO2 chemical composition. So as to add defects and allow for sodium ion mobility, Fe(IV), Si, Sn, Ti, Zr, V, P, or S can be added. For example, (1−x)(NaFeO2)+x(XO2) can be melted with the corresponding oxide XO2, where X is Fe(IV), Si, Sn, Ti, Zr, V, P, or S, and x is between 0.1 and 0.5. These dopants generally preserve the crystallographic structure while decreasing the ion mobility barrier.
Claims20
An apparatus, comprising:
- a solid-state ion conductor represented by the general formula NaFe3/4X1/4, wherein X is selected from the group consisting of Fe(IV), Si, Sn, Ti, Zr, V, P, and S.
An apparatus, comprising:
- a solid metal sodium unit;
- and
- a coating on at least one surface of the solid metal sodium unit, wherein the coating comprises a material represented by the general formula NaFe3/4X1/4, wherein X is selected from the group consisting of Fe(IV), Si, Sn, Ti, Zr, V, P, and S.
A method for forming a solid-state conductor, the method comprising melting NaFeO2 with a corresponding oxide XO2 according to the general formula (1−x)(NaFeO2)+x(XO2), wherein X is selected from the group consisting of Fe(IV), Si, Sn, Ti, Zr, V, P, and S, and x is between 0.1 and 0.5, to thereby form the solid-state conductor having a sodium oxoferrate structure of the general formula NaFe3/4X1/4.
Dependencies are inferred from the claim text.