US4562124A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air electrode material for high temperature electrochemical cells
Assignee: Siemens Energy Inc
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Filing: 1985-01-22
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Granted: 1985-12-31
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Expires: 2005-01-22
Abstract
Abstract Disclosed is a solid solution with a perovskite-like crystal structure having the general formula La.sub.1-x-w (M.sub.L).sub.x (Ce).sub.w (M.sub.S1).sub.1-y (M.sub.S2).sub.y O 3 where M L is Ca, Sr, Ba, or mixtures thereof, M S1 is Mn, Cr, or mixtures thereof and M S2 is Ni, Fe, Co, Ti, Al, In, Sn, Mg, Y, Nb, Ta, or mixtures thereof, w is about 0.05 to about 0.25, x+w is about 0.1 to about 0.7, and y is 0 to about 0.5. In the formula, M L is preferably Ca, w is preferably 0.1 to 0.2, x+w is preferably 0.4 to 0.7, and y is preferably 0. The solid solution can be used in an electrochemical cell where it more closely matches the thermal expansion characteristics of the support tube and electrolyte of the cell.
Inventors
- 👤 Roswell J. Ruka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:49
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/403; G01N27/406; G01N27/407; G01N27/4075; C; C04; C04B; C04B35/00; C04B35/50; C25; C25B; C25B11/00; C25B11/04; C25B11/042; C25B11/047; H; H01; H01M; H01M4/00; H01M4/86; H01M4/90; H01M4/9016; H01M8/00; H01M8/10; H01M8/12; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/50
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
96 words
A compound comprising a solid solution having the general formula La.sub.1-x-w (M.sub.L).sub.x (Ce).sub.2 (M.sub.S1).sub.1-y (M.sub.S2).sub.y O.sub.3 where M L is selected from the group consisting of Ca, Sr, Ba, and mixtures thereof, M S1 is selected from the group consisting of Mn, Cr, and mixtures thereof, M S2 is selected from the group consisting of Ni, Fe, Co, Ti, Al, In, Sn, Mg, Y, Nb, Ta, and mixtures thereof, w is about 0.05 to about 0.25, x+w is about 0.1 to about 0.7, and y is 0 to about 0.5, but not exceeding the solubility limit.
Claim 2
Dependent Claim
96 words
A compound comprising a solid solution having the general formula La.sub.1-x-w (M.sub.L).sub.x (Ce).sub.2 (M.sub.S1).sub.1-y (M.sub.S2).sub.y O.sub.3 where M L is selected from the group consisting of Ca, Sr, Ba, and mixtures thereof, M S1 is selected from the group consisting of Mn, Cr, and mixtures thereof, M S2 is selected from the group consisting of Ni, Fe, Co, Ti, Al, In, Sn, Mg, Y, Nb, Ta, and mixtures thereof, w is about 0.05 to about 0.25, x+w is about 0.1 to about 0.7, and y is 0 to about 0.5, but not exceeding the solubility limit.
Claim 3
Dependent Claim
28 words
A compound according to claim 1 wherein M L is Ca and M S is selected from the group consisting of 100 mole% Mn, Cr, and mixtures thereof.
Claim 4
Dependent Claim
14 words
A compound according to claim 1 wherein w is about 0.1 to about 0.2.
Claim 5
Dependent Claim
14 words
A compound according to claim 1 wherein x+w is about 0.4 to about 0.7.
Claim 6
Dependent Claim
31 words
A compound according to claim 1 wherein the composition of said solid solution is selected to match the thermal expansion characteristics of a stabilized zirconia electrolyte or electrochemical cell support tube.
Claim 7
Dependent Claim
45 words
A compound according to claim 1 having the formula La 0 .3 Ca 0 .5 to 0.6 Ce 0 .2 to 0.1 MnO 3 bonded to a solid solution having the approximate formula (ZrO 2 ) 0 .9 (Y 2 O 3 ) 0 .1.
Claim 8
Dependent Claim
41 words
A compound according to claim 1 having the formula La 0 .3 Ca 0 .5 to 0.6 Ce 0 .2 to 0.1 MnO 3 bonded to a solid solution having the approximate formula (ZrO 2 ) 0 .85 (CaO) 0 .15.
Claim 9
Dependent Claim
45 words
A compound according to claim 1 having the formula La 0 .3 Ca 0 .5 to 0.6 Ce 0 .2 to 0.1 CrO 3 bonded to a solid solution having the approximate formula (ZrO 2 ) 0 .9 (Y 2 O 3 ) 0 .1.
Claim 10
Dependent Claim
41 words
A compound according to claim 1 having the formula La 0 .3 Ca 0 .5 to 0.6 Ce 0 .2 to 0.1 CrO 3 bonded to a solid solution having the approximate formula (ZrO 2 ) 0 .85 (CaO) 0 .15.
Claim 11
Dependent Claim
38 words
A combination support tube and electrode comprising a compound according to claim 1 in the shape of a tube that is porous to gases, where the density of said solid solution does not exceed about 80% of theoretical.
Claim 12
Dependent Claim
37 words
In an electrochemical cell, an electrode or electrode current carrier comprising a compound according to claim 1, bonded to an electrolyte, and which may provide mechanical support for other cell members or a components of the cell.
Claim 13
Dependent Claim
21 words
An electrode material in a fuel cell, an electrolytic cell, or an oxygen gauge comprising a compound according to claim 1.
Claim 14
Dependent Claim
45 words
A compound comprising a solid solution having the general formula La.sub.1-x-w (Ca).sub.x (Ce).sub.w M.sub.S O.sub.3 where M S is selected from the group consisting of Mn, Cr, and mixtures thereof, w is about 0.1 to about 0.2, and x+w is about 0.4 to about 0.7.
Claim 15
Dependent Claim
45 words
A compound comprising a solid solution having the general formula La.sub.1-x-w (Ca).sub.x (Ce).sub.w M.sub.S O.sub.3 where M S is selected from the group consisting of Mn, Cr, and mixtures thereof, w is about 0.1 to about 0.2, and x+w is about 0.4 to about 0.7.
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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) | 1988-12-30 | 1989-07-01 | 1989-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-12-30 | 1993-07-01 | 1993-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-12-30 | 1997-07-01 | 1997-12-31 | $7700.00 | Window Closed / Lapsed |