Hybrid thin film/thick film solid oxide fuel cell and method of manufacturing the same

• US 6,677,070 B2
• Filed: 04/19/2001
• Issued: 01/13/2004
• Est. Priority Date: 04/19/2001
• Status: Expired due to Term

• Current Assignee: Intelligent Energy Limited (Lb-shell Plc)
• Original Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Inventors: Kearl, Daniel A.
• Primary Examiner(s): Ryan, Patrick
• Assistant Examiner(s): DOVE, TRACY MAE
• Application Number:
  US09/839,956
• Publication Number:
  US 20020155335A1
• Time in Patent Office: 999 Days
• Field of Search: 429/30, 429/33, 429/34, 429/40, 429/41, 429/44, 429/46
• US Class Current: 429/465
• CPC Class Codes: H01M 16/006 of fuel cells with rechargeable batteries
• CPC Class Codes: H01M 2008/1293 Fuel cells with solid oxide electrolytes
• CPC Class Codes: H01M 2250/30 Fuel cells in portable systems, e.g. mobile phone, laptop
• CPC Class Codes: H01M 4/861 with a gradient in the porosity
• CPC Class Codes: H01M 4/8621 containing only metallic or ceramic material, e.g. made by sintering or sputtering
• CPC Class Codes: H01M 4/8885 Sintering or firing
• CPC Class Codes: H01M 4/9033 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 Class Codes: H01M 4/9066 of metal-ceramic composites or mixtures, e.g. cermets
• CPC Class Codes: H01M 8/0204 Non-porous and characterised by the material
• CPC Class Codes: H01M 8/1213 characterised by the electrode/electrolyte combination or the supporting material
• CPC Class Codes: H01M 8/1226 characterised by the supporting layer
• CPC Class Codes: H01M 8/1246 the electrolyte consisting of oxides
• CPC Class Codes: H01M 8/1286 Fuel cells applied on a support, e.g. miniature fuel cells deposited on silica supports
• CPC Class Codes: H01M 8/2428 Grouping by arranging unit cells on a surface of any form, e.g. planar or tubular
• CPC Class Codes: H01M 8/2432 Grouping of unit cells of planar configuration
• CPC Class Codes: Y02B 90/10 Applications of fuel cells in buildings
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02E 60/50 Fuel cells
• CPC Class Codes: Y02P 70/50 Manufacturing or production processes characterised by the final manufactured product
• CPC Class Codes: Y10T 29/49108 Electric battery cell making

Abstract

A SOFC providing higher power densities than PEM-based cells; the possibility of direct oxidation and/or internal reforming of fuel; and reduced SOFC operating temperatures. The SOFC comprises a thin film electrolyte layer. A thick film anode layer is disposed on one surface of the electrolyte layer; and a thick film cathode layer is disposed on the opposite surface of the electrolyte layer. A method of making the SOFC comprises the steps of: creating a well in one side of a dielectric or semiconductor substrate; depositing a thin film solid oxide electrolyte layer on the surface of the well; applying a thick film electrode layer in the electrolyte coated well; creating a counter well in the opposite side of the substrate, the counter well abutting the electrolyte layer; and applying a thick film counter electrode layer in the counter well.

Claims

1. A fuel cell comprising:

a thin film electrolyte layer having a first surface and a second surface, the first surface being opposed to the second surface;

a thick film anode layer disposed on the first surface; and

a thick film cathode layer disposed on the second surface;

wherein at least one of the anode layer or the cathode layer has a thickness of about 30 microns; and

wherein the electrolyte layer consists essentially of Ta₂O₅.

2. The fuel cell as defined in claim 1 wherein the electrolyte layer has a thickness ranging from greater than 0 microns to about 20 microns.

3. The fuel cell as defined in claim 2 wherein the electrolyte layer has a thickness greater than 0 microns to about 10 microns.

4. The fuel cell as defined in claim 3 wherein the electrolyte layer has a thickness ranging between about 2 microns and about 5 microns.

5. The fuel cell as defined in claim 1 wherein each of the anode and cathode layers has a thickness of about 30 microns.

6. The fuel cell as defined in claim 1 wherein each of the anode and cathode layers has a thickness ranging between about 30 microns and about 500 microns.

7. The fuel cell as defined in claim 1 wherein the anode layer has an interconnected porosity ranging between about 19% and about 55%;

and the cathode layer has an interconnected porosity ranging between about 19% and about 55%.

8. The fuel cell as defined in claim 7 wherein each of the anode layer interconnected porosity and the cathode layer interconnected porosity ranges between about 20% and about 25%.

10. The fuel cell as defined in claim 1 wherein the anode layer comprises a material selected from the group consisting of nickel (Ni), Ni-yttria stabilized zirconia cermet, copper doped cerie, gadolinium doped ceria, strontium doped ceria, yttria doped cerie, Cu-YSZ cermet, Co-stabilized zirconia cermet, Ru-stabilized zirconia cermet, LSGM+nickel oxide, and mixtures thereof.

11. The fuel cell as defined in claim 1 wherein the cathode layer comprises a material having a perovskite structure.

12. The fuel cell as defined in claim 11 wherein the cathode layer comprises a material selected from the group consisting of lanthanum strontium manganate, lanthanum strontium ferrite, lanthanum strontium cobaltite, LaFeO₃/LaCoO₃, YMnO₃, CaMnO₃, YFeO₃, and mixtures thereof.

13. The fuel cell as defined in claim 1 wherein the cathode layer comprises silver.

14. The fuel cell as defined in claim 1, the fuel cell further comprising:

a first interfacial layer, positioned between the anode and the electrolyte; and

a second interfacial layer positioned between the cathode and the electrolyte.

15. The fuel cell as defined in claim 14 wherein the first interfacial layer comprises yttria doped ceria (YDC).

16. The fuel cell as defined in claim 14 wherein the second interfacial layer comprises yttria stabilized bismuthsesquioxide (YSB).

17. The fuel cell as defined in claim 1, further comprising a material for connecting the fuel cell to at least one of an electrical load or an electrical storage device, the connecting material deposited on at least one of the anode layer or the cathode layer.

23. The fuel cell as defined in claim 1, further comprising:

a plurality of the fuel cells arrayed within a substrate;

an electrical connection between the plurality of anode layers; and

an electrical connection between the plurality of cathode layers.

24. The fuel cell as defined in claim 23 wherein the plurality of fuel cells are connected within a planar array, the planar array having a first plane adapted to contact a source of oxygen, the first plane having a plurality of cathode layers therein, the planar array further having a second plane opposed to the first plane, the second plane adapted to contact a fuel, the second plane having a plurality of anode layers therein.

25. The fuel cell as defined in claim 24 wherein the source of oxygen is air.

26. The fuel cell as defined in claim 24 wherein the fuel is selected from the group consisting of methane, butane, propane, pentane, methanol, ethanol, higher straight chain or mixed hydrocarbons, and mixtures thereof.

27. The fuel cell as defined in claim 1 wherein the fuel cell has a power density of between about 100 mW/cm² and about 2000 mW/cm².

28. The fuel cell as defined in claim 27 wherein the fuel cell has a power density of between about 1000 mW/cm² and about 2000 mW/cm².

29. The fuel cell as defined in claim 28 wherein the fuel cell has an operating temperature of between about 400°

C. and about 800°

C.

30. The fuel cell as defined in claim 29 wherein the fuel cell has an operating temperature of between about 400°

C. and about 600°

C.

31. The fuel cell as defined in claim 30 wherein the fuel cell has an operating temperature of between about 400°

C. and about 500°

C.

9. A fuel cell, comprising:

a thin film electrolyte layer having a first surface and a second surface, the first surface being opposed to the second surface;

a thick film anode layer disposed on the first surface; and

a thick film cathode layer disposed on the second surface;

wherein the electrolyte layer consists essentially of Ta₂O₅.

18. A fuel cell comprising:

a thin film electrolyte layer having a first surface and a second surface, the first surface being opposed to the second surface;

a thick film anode layer disposed on the first surface; and

a thick film cathode layer disposed on the second surface; and

a material for connecting the fuel cell to at least one of an electrical load or an electrical storage device, the connecting material deposited on at least one of the anode layer or the cathode layer;

wherein at least one of the anode layer or the cathode layer has a thickness of about 30 microns;

wherein the electrical load comprises at least one of computers, portable electronic appliances or communication devices; and

wherein the electrolyte layer consists essentially of Ta₂O₅.

19. A fuel cell comprising:

a thin film electrolyte layer having a first surface and a second surface, the first surface being opposed to the second surface;

a thick film anode layer disposed on the first surface; and

a thick film cathode layer disposed on the second surface; and

a material for connecting the fuel cell to at least one of an electrical load or an electrical storage device, the connecting material deposited on at least one of the anode layer or the cathode layer;

wherein at least one of the anode layer or the cathode layer has a thickness of about 30 microns;

wherein the electrical storage device comprises at least one of capacitors, batteries or power conditioning devices; and

wherein the electrolyte layer consists essentially of Ta₂O₅.

20. A fuel cell comprising:

a thin film electrolyte layer having a first surface and a second surface, the first surface being opposed to the second surface;

a thick film anode layer disposed on the first surface; and

a thick film cathode layer disposed on the second surface; and

a material for connecting the fuel cell to at least one of an electrical load or an electrical storage device, the connecting material deposited on at least one of the anode layer or the cathode layer;

wherein at least one of the anode layer or the cathode layer has a thickness of about 30 microns;

wherein the connecting material has as a main component thereof a material selected from the group consisting of silver, palladium, platinum, gold, titanium, tantalum, chromium, iron, nickel, carbon, stainless steels, high temperature nickel alloys, tungsten, and mixtures thereof; and

wherein the electrolyte layer consists essentially of Ta₂O₅.

21. The fuel cell as defined in claim 21, further comprising a material for interconnecting at least two of the fuel cells, the interconnecting material deposited on at least one of the anode layer or the cathode layer.

22. The fuel cell as defined in claim 21 wherein the interconnecting material is a material selected from the group consisting of lanthanum chromites, nickel, copper, titanium, tantalum, chromium, iron, carbon, stainless steels, high temperature nickel alloys, tungsten, and mixtures thereof.

32. A fuel cell comprising:

a thin film electrolyte layer having a first surface and a second surface, the first surface being opposed to the second surface;

wherein the electrolyte layer has a thickness greater than 0 microns to about 10 microns;

a thick film anode layer disposed on the first surface, wherein the anode layer has an interconnected porosity ranging between about 19% and about 55%; and

a thick film cathode layer disposed on the second surface, wherein the cathode layer has an interconnected porosity ranging between about 19% and about 55%, wherein at least one of the anode or cathode layers has a thickness of about 30 microns; and

wherein the electrolyte layer consists essentially of Ta₂O₅.

33. The fuel cell as defined in claim 32 wherein each of the anode layer, cathode layer and electrolyte layer are formed substantially within a substrate.

34. The fuel cell as defined in claim 35 wherein the anode layer comprises a material selected from the group consisting of nickel (Ni), Ni-yttria stabilized zirconia cermet, copper doped ceria, gadolinium doped ceria, strontium doped ceria, yttria doped ceria, Cu-YSZ cermet, Co-stab ilized zirconia cermet, Ru-stabilized zirconia cermet, LSGM+nickel oxide, and mixtures thereof;

and wherein the cathode layer comprises a material selected from the group consisting of lanthanum strontium manganate, lanthanum strontium ferrite, lanthanum strontium cobaltite, LaFeO₃/LaCoO₃, YMnO₃, CaMnO₃, YFeO₃, silver and mixtures thereof.

35. The fuel cell as defined in claim 33, the fuel cell further comprising:

a first interfacial layer, positioned between the anode and the electrolyte; and

a second interfacial layer positioned between the cathode and the electrolyte.

36. The fuel cell as defined in claim 35, further comprising a material for connecting the fuel cell to at least one of an electrical load or an electrical storage device, the connecting material deposited on at least one of the anode layer or the cathode layer, wherein the electrical load comprises at least one of computers, portable electronic appliances, or communication devices, and wherein the electrical storage device comprises at least one of capacitors, batteries, or power conditioning devices.

37. The fuel cell as defined in claim 36, further comprising a material for interconnecting at least two of the fuel cells, the interconnecting material deposited on at least one of the anode layer or the cathode layer.

38. The fuel cell as defined in claim 37, further comprising;

a plurality of the fuel cells arrayed within a substrate;

an electrical connection between the plurality of anode layers; and

an electrical connection between the plurality of cathode layers.

39. A fuel cell, comprising:

a thin film electrolyte layer consisting essentially of Ta₂O₅ having a first surface and a second surface, the first surface being opposed to the second surface, wherein the electrolyte layer has a thickness greater than 0 microns to about 10 microns;

a thick film anode layer disposed on the first surface, wherein the anode layer has an interconnected porosity ranging between about 19% and about 55%;

a thick film cathode layer disposed on the second surface, wherein the cathode layer has an interconnected porosity ranging between about 19% and about 55%, and wherein each of the anode and cathode layers has a thickness greater than or equal to 30 microns, wherein each of the anode layer, cathode layer and electrolyte layer are formed substantially within a substrate;

a first interfacial layer, positioned between the anode and the electrolyte;

a second interfacial layer positioned between the cathode and the electrolyte;

a material for connecting the fuel cell to at least one of an electrical load or an electrical storage device, the connecting material deposited on at least one of the anode layer or the cathode layer, wherein the electrical load comprises at least one of computers, portable electronic appliances, or communication devices, and wherein the electrical storage device comprises at least one of capacitors, batteries, or power conditioning devices;

a material for interconnecting at least two of the fuel cells, the interconnecting material deposited on at least one of the anode layer or the cathode layer;

a plurality of the fuel cells arrayed within a substrate;

an electrical connection between the plurality of anode layers; and

an electrical connection between the plurality of cathode layers;

wherein the plurality of fuel cells are connected within a planar array, the planar array having a first plane adapted to contact a source of oxygen, the first plane having a plurality of cathode layers therein, the planar array further having a second plane opposed to the first plane, the second plane adapted to contact a fuel, the second plane having a plurality of anode layers.

40. A fuel cell system including a plurality of fuel cells, each of the fuel cells comprising:

a thin film electrolyte layer consisting essenitially of Ta₂O₅ having a first surface and a second surface, the first surface being opposed to the second surface;

a thick film anode layer disposed on the first surface; and

a thick film cathode layer disposed on the second surface;

wherein the fuel cell system comprises;

a planar array of the plurality of the fuel cells within a substrate;

an electrical connection between the plurality of anode layers; and

an electrical connection between the plurality of cathode layers.

41. The fuel cell system as defined in claim 40 wherein the planar array has a first plane adapted to contact a source of oxygen, the first plane having a plurality of cathode layers therein, the planar array further having a second plane opposed to the first plane, the second plane adapted to contact a fuel, the second plane having a plurality of anode layers.