Ni—Fe based cathode functional layers for solid oxide electrochemical cells

Patent metadata

Field	Value
Publication number	US-11742495-B2
Application number	US-202218052701-A
Country	US
Kind code	B2
Filing date	Nov 4, 2022
Priority date	Nov 11, 2021
Publication date	Aug 29, 2023
Grant date	Aug 29, 2023

Abstract

A solid oxide electrochemical cell includes a solid oxide electrolyte, an anode located on a first side of the solid oxide electrolyte, and a cathode located on a second side of the solid oxide electrolyte. The cathode includes lanthanum nickel ferrite.

First claim

The invention claimed is:

1. A solid oxide electrochemical cell, comprising:
a solid oxide electrolyte;
an anode located on a first side of the solid oxide electrolyte; and
a cathode functional layer located directly on a second side of the solid oxide electrolyte, the cathode functional layer comprising a mixture of a lanthanum nickel ferrite perovskite material and a non-perovskite ionically conductive ceramic material; and
a cathode current collecting layer disposed on the cathode functional layer and comprising a perovskite material.

2. The solid oxide electrochemical cell of claim 1 , wherein the cathode functional layer excludes strontium and manganese.

3. The solid oxide electrochemical cell of claim 1 , wherein the lanthanum nickel ferrite has a formula LaNi 1-y Fe y O 3-δ where 0.2<y<1 and 0≤δ≤0.1.

4. The solid oxide electrochemical cell of claim 3 , wherein 0.4<y<0.6.

5. The solid oxide electrochemical cell of claim 1 , wherein the lanthanum nickel ferrite has a formula La 1-x Ca x Ni 1-y Fe y O 3-δ where 0.05<x<0.3, 0.3<y<0.7, and 0≤δ≤0.1.

6. The solid oxide electrochemical cell of claim 1 , wherein the non-perovskite ionically conductive ceramic material comprises a stabilized zirconia material.

7. The solid oxide electrochemical cell of claim 6 , wherein the stabilized zirconia material comprises zirconia stabilized with 9 to 11 mol % scandia, greater than 0 and equal to or less than 3 mol % ceria, and greater than 0 and equal to or less than 2.5 mol % ytterbia.

8. The solid oxide electrochemical cell of claim 1 , wherein the non-perovskite ionically conductive ceramic material consists essentially of a doped ceria material.

9. The solid oxide electrochemical cell of claim 1 , wherein a weight percent ratio of the lanthanum nickel ferrite perovskite material to the non-perovskite ionically conductive ceramic material is 3:7 to 7:3.

10. The solid oxide electrochemical cell of claim 1 , wherein the cathode current collecting layer comprises lanthanum strontium manganite, lanthanum strontium cobaltite or lanthanum strontium cobalt ferrite.

11. The solid oxide electrochemical cell of claim 1 , wherein the lanthanum nickel ferrite comprises a perovskite material having a cubic lattice structure.

12. The solid oxide electrochemical cell of claim 1 , wherein the solid oxide electrochemical cell comprises a solid oxide fuel cell.

13. The solid oxide electrochemical cell of claim 1 , wherein the solid oxide electrochemical cell comprises a reversible solid oxide fuel cell.

14. The solid oxide electrochemical cell of claim 1 , wherein the solid oxide electrochemical cell comprises a solid oxide electrolyzer cell.

15. A method of making a solid oxide electrochemical cell, comprising:
providing a solid oxide electrolyte;
forming an anode on a first side of the solid oxide electrolyte; and
forming a cathode on a second side of the solid oxide electrolyte, the cathode comprising a cathode functional layer disposed directly on the second side of the solid oxide electrolyte and comprising a mixture of a lanthanum nickel ferrite perovskite material and a non-perovskite ionically conductive ceramic material, and a cathode current collecting layer disposed on the cathode functional layer and comprising a perovskite material.

16. The method of claim 15 , wherein:
the lanthanum nickel ferrite has a formula LaNi 1-y Fe y O 3-δ where 0.2<y<1 and 0≤δ≤0.1 or La 1-x Ca x Ni 1-y Fe y O 3-δ where 0.05<x<0.3, 0.3<y<0.7, and 0≤δ≤0.1; and
the cathode current collecting layer comprises lanthanum strontium manganite, lanthanum strontium cobaltite or lanthanum strontium cobalt ferrite.

17. The method of claim 15 , wherein the solid oxide electrochemical cell comprises a solid oxide fuel cell or a solid oxide electrolyzer cell.

18. The solid oxide electrochemical cell of claim 1 , wherein the cathode current collecting layer covers the entire upper surface of the cathode functional layer.

Assignees

• Bloom Energy Corp

Inventors

• Armstrong Tad

Classifications

• H01M4/9033 Primary

  Complex oxides, optionally doped, of the type M1MeO3, M1 being an alkaline earth metal or a rare earth, Me being a metal, e.g. perovskites · CPC title

• H01M4/8605

  Porous electrodes · CPC title

• H01M8/1246

  the electrolyte consisting of oxides · CPC title

• H01M2004/8689

  Positive electrodes · CPC title

• H01M2008/1293

  Fuel cells with solid oxide electrolytes · CPC title