Sodium ion solid-state conductors with sodium oxoferrate structure

Patent metadata

Field	Value
Publication number	US-10170790-B2
Application number	US-201715480202-A
Country	US
Kind code	B2
Filing date	Apr 5, 2017
Priority date	Apr 5, 2017
Publication date	Jan 1, 2019
Grant date	Jan 1, 2019

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.

First claim

What is claimed is:

1. An apparatus, comprising:
a solid-state ion conductor represented by the general formula NaFe 3/4 X 1/4 , wherein X is selected from the group consisting of Fe(IV), Si, Sn, Ti, Zr, V, P, and S.

2. The apparatus of claim 1 , wherein the solid-state ion conductor comprises a thin film.

3. The apparatus of claim 1 , further comprising:
a first electrode in contact with the ion conductor; and
a second electrode in contact with the ion conductor.

4. The apparatus of claim 3 , further comprising a first electrical lead in contact with the first electrode and a second electrical lead in contact with the second electrode.

5. The apparatus of claim 3 , further comprising a first current collector in contact with the first electrode and a second current collector in contact with the second electrode.

6. The apparatus of claim 5 , further comprising a first electrical lead in contact with the first current collector and a second electrical lead in contact with the second current collector.

7. The apparatus of claim 6 , further comprising a load attached to the first electrical lead and the second electrical lead.

8. The apparatus of claim 3 , wherein the solid-state ion conductor comprises a thin film, the first electrode comprises a thin film, and the second electrode comprises a thin film.

9. The apparatus of claim 3 , wherein the first electrode comprises a layer of negative solid-state material adapted for electrochemically adsorbing and desorbing lithium ions during charge and discharge.

10. The apparatus of claim 3 , wherein the second electrode comprises a layer of positive solid-state material adapted for electrochemically desorbing and adsorbing lithium ions during charge and discharge.

11. The apparatus of claim 10 , wherein the layer of negative solid-state material comprises a layer of lithium metal.

12. The apparatus of claim 10 , wherein the layer of positive solid-state material comprises a layer of V 2 O 5 .

13. 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 NaFe 3/4 X 1/4 , wherein X is selected from the group consisting of Fe(IV), Si, Sn, Ti, Zr, V, P, and S.

14. The apparatus of claim 13 , further comprising an electrical terminal attached to the solid metal sodium unit.

15. The apparatus of claim 14 , wherein the electrical terminal penetrates the coating.

16. The apparatus of claim 13 , wherein the coating surrounds the solid metal sodium unit.

17. The apparatus of claim 13 , further comprising a wire attached to the solid metal sodium unit, and wherein the coating surrounds the solid metal sodium unit and a portion of the wire.

18. The apparatus of claim 13 , wherein the coating comprises a thin film.

19. A method for forming a solid-state conductor, the method comprising melting NaFeO 2 with a corresponding oxide XO 2 according to the general formula (1−x)(NaFeO 2 )+x(XO 2 ), 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 NaFe 3/4 X 1/4 .

20. The method of claim 19 , wherein x=0.25.

Assignees

• IBM

Inventors

• Laino Teodoro
• Weber Valery

Classifications

• H01M10/052

  Li-accumulators · CPC title

• H01M10/054 Primary

  Accumulators with insertion or intercalation of metals other than lithium, e.g. with magnesium or aluminium · CPC title

• H01M4/136

  Electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy · CPC title

• H01M4/483

  for non-aqueous cells (H01M4/485 takes precedence) · CPC title

• H01M10/0562

  Solid materials · CPC title