Patent EP0454925A1 successfully refreshed from Google Patents.
EP0454925A1
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Method of bonding an interconnection layer on an electrode
Assignee: Westinghouse Electric Corp
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Filing: 1990-12-14
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Granted: —
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Expires: 2010-12-14
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 LaCrO₃ 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 LaCrO₃ particles (30).
Inventors
- 👤 Uday Bhanu Pal
- 👤 Arnold Otto Isenberg
- 👤 George Robert Folser
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 08:15
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
109 words
A method of bonding a dense, high temperature electronically conductive layer on an electrode structure characterized by the steps: (A) applying a thin layer of LaCrO₃ 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 LaCrO₃ between and around the doped LaCrO₃ 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
Dependent Claim
112 words
The method of claim 1, characterized in that 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, lanthanumchromium oxide structure to grow from the first electrode surface, between and around the doped LaCrO₃ particles.
Claim 3
Dependent Claim
36 words
The method of claim 1, characterized in that the electrode structure is a porous, tubular air electrode structure comprising doped LaMnO₃, and the dense, electrochemical vapor deposited skeletal structure consists essentially of LaCrO₃ doped with Mg.
Claim 4
Dependent Claim
35 words
The method of claim 1, characterized in that the doped LaCrO₃ particles comprise from 10 weight % to 90 weight % of the combined interconnection weight and the electrode structure is annealed after step (B).
Claim 5
Dependent Claim
47 words
The method of claim 1, characterized in that the doped LaCrO₃ particles have diameters from 10 micrometers to 500 micrometers, are applied as a closely packed layer, and the particle remain intact within the interconnection layer in discrete form after step (B) with minimal loss of dopant.
Claim 6
Dependent Claim
66 words
The method of claim 1, characterized in that the electrode structure is an air electrode, and the layer of doped LaCrO₃ particles is applied in step (A) by wetting the electrode structure, wet spraying doped LaMnO₃ air electrode material onto the air electrode surface, and then applying the doped LaCrO₃ particles, where the doped LaMnO₃ material has a smaller particle size than the doped LaCrO₃ particles.
Claim 7
Dependent Claim
30 words
The method of claim 1, characterized in that the electrode structure is an air electrode, and the layer of doped LaCrO₃ particles is applied in step (A) by tape application.
Claim 8
Dependent Claim
35 words
The method of claim 1, characterized in that 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 9
Dependent Claim
83 words
A tubular electrochemical cell comprising an air electrode, a gas-tight solid electrolyte surrounding most of the outer periphery of the air electrode except for a narrow section of interconnection material contacting the air electrode, and a fuel electrode covering most of the electrolyte, characterized in that the interconnection material contains a thin layer of closely packed, discrete LaCrO₃ particles doped with an element selected from the group consisting of Ca, Sr, Co, Ba, fig and mixtures thereof within a skeletal structure comprising LaCrO₃.
Claim 10
Dependent Claim
44 words
The electrochemical cell of claim 9, characterized in that the LaCrO₃ particles are in the form of a closely packed layer, have diameters from 10 micrometers to 500 micrometers and comprise from 10 weight % to 90 weight % of the combined interconnection weight.
References Cited (Backward Citations)
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