US5080689A
Expired / Lapsed
US
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Method of bonding an interconnection layer on an electrode of an electrochemical cell
Assignee: Westinghouse Electric Corp
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Filing: 1990-04-27
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Granted: 1992-01-14
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Expires: 2010-04-27
Abstract
Abstract An electrochemical cell containing an air electrode (16), contacting electrolyte and electronically conductive interconnection layer (26), and a fuel electrode, has the interconnection layer (26) attached by: (A) applying a thin, closely packed, discrete layer of LaCrO 3 particles (30), doped with an element selected from the group consisting of Ca, Sr, Co, Ba, Mg and their mixtures on a portion of the air electrode, and then (B) electrochemical vapor depositing a dense skeletal structure (32) between and around the doped LaCrO 3 particles (30).
Inventors
- 👤 Uday B. Pal
- 👤 Arnold O. Isenberg
- 👤 George R. Folser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 16:19
CPC Classifications
C; C23; C23C; C23C16/00; C23C16/22; C23C16/30; C23C16/40; H; H01; H01M; H01M8/00; H01M8/002; H01M8/004; H01M8/02; H01M8/0202; H01M8/0204; H01M8/0215; H01M8/0217; H01M8/0219; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/50; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49108; Y10T29/49115
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
111 words
A method of bonding a dense, high temperature electronically conductive layer on an electrode structure comprising the steps: (A) applying a thin layer of LaCrO 3 particles which are doped with an element selected from the group consisting of Ca, Sr, Co, Ba, Mg, and mixtures thereof, on a portion of a first surface of a porous electrode structure, and then (B) vapor depositing a dense, skeletal structure comprising LaCrO 3 between and around the doped LaCrO 3 particles, where the particles get incorporated into and remain within the structure as it grows thicker with time, to provide a dense, high temperature, electronically conductive interconnection layer on the porous electrode structure.
Claim 2
Independent Claim
111 words
A method of bonding a dense, high temperature electronically conductive layer on an electrode structure comprising the steps: (A) applying a thin layer of LaCrO 3 particles which are doped with an element selected from the group consisting of Ca, Sr, Co, Ba, Mg, and mixtures thereof, on a portion of a first surface of a porous electrode structure, and then (B) vapor depositing a dense, skeletal structure comprising LaCrO 3 between and around the doped LaCrO 3 particles, where the particles get incorporated into and remain within the structure as it grows thicker with time, to provide a dense, high temperature, electronically conductive interconnection layer on the porous electrode structure.
Claim 3
Independent Claim
110 words
The method of claim where the vapor deposition step is an electrochemical vapor deposition step which comprises heating the electrode structure, and applying metal halide vapors comprising lanthanum halide chromium halide and magnesium halide to the outer first surface of the porous electrode structure and applying a source of oxygen to an inner second, opposite surface of the porous electrode structure, so that oxygen contacts the metal halide vapor at said first surface of the electrode to cause a reaction of the oxygen with the metal halide vapor and cause a dense, lanthanum-chromium oxide structure to grow from the first electrode surface, between and around the doped LaCrO 3 particles.
Claim 4
Dependent Claim
37 words
The method of claim 1, where the electrode structure is a porous, tubular air electrode structure comprising doped LaMnO 3 , and the dense, electrochemical vapor deposited skeletal structure consists essentially of LaCrO 3 doped with Mg.
Claim 5
Dependent Claim
34 words
The method of claim 1, where the doped LaCrO 3 particles comprise from 10 weight % to 90 weight % of the combined interconnection weight and the electrode structure is annealed after step (B).
Claim 6
Dependent Claim
46 words
The method of claim 1, where the doped LaCrO 3 particles have diameters from 10 micrometers to 500 micrometers, are applied as a closely packed layer, and the particles remain intact within the interconnection layer in discrete form after step (B) with minimal loss of dopant.
Claim 7
Dependent Claim
69 words
The method of claim 1, where the electrode structure is an air electrode, and the layer of doped LaCrO 3 particles is applied in step (A) by wetting the electrode structure, wet spraying doped LaMnO 3 air electrode material onto the air electrode surface, and then applying the doped LaCrO 3 particles, where the doped LaMnO 3 material has a smaller particle size than the doped LaCrO 3 particles.
Claim 8
Dependent Claim
29 words
The method of claim 1, where the electrode structure is an air electrode, and the layer of doped LaCrO 3 particles is applied in step (A) by tape application.
Claim 9
Dependent Claim
33 words
The method of claim 1, where by choosing dopants and fixing dopant content in the particles, an electronically conductive interconnection layer can be fabricated closely matching in thermal expansion with the electrode structure.
Claim 10
Dependent Claim
34 words
The method of claim 1, where solid electrolyte is applied over the remaining portion of the air electrode surface and a cermet fuel electrode is applied over the electrolyte, to provide an electrochemical cell.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-01-13 | 1995-07-15 | 1996-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-01-13 | 1999-07-15 | 2000-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-01-13 | 2003-07-15 | 2004-01-14 | $7700.00 | Window Closed / Lapsed |