US4425415A
Expired / Lapsed
US
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Etched beta"-alumina ceramic electrolyte
Assignee: General Electric Co
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Filing: 1982-08-19
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Granted: 1984-01-10
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Expires: 2002-08-19
Abstract
Abstract A cationically-conductive sodium beta"-alumina electrolyte showing asymmetric polarization is contacted with phosphoric acid to produce an etched electrolyte showing no asymmetric polarization.
Inventors
- 👤 Raj N. Singh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:14
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/53; C09; C09K; C09K13/00; C09K13/04; H; H01; H01M; H01M10/00; H01M10/36; H01M10/39; H01M10/3909; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
84 words
A cationically-conductive ceramic electrolyte body wherein its entire surface is a chemically-etched surface, said ceramic electrolyte body being of symmetric polarization, said ceramic eletrolyte body consisting essentially of a composition ranging from an alkali metal beta"-alumina phase to a mixture of alkali metal beta"-alumina phase and up to about 50% by volume of alkali metal beta-alumina phase based on the total volume of said electrolyte body, said alkali metal being selected from the group consisting of sodium, potassium, lithium, mixtures thereof and alloys thereof.
Claim 2
Dependent Claim
84 words
A cationically-conductive ceramic electrolyte body wherein its entire surface is a chemically-etched surface, said ceramic electrolyte body being of symmetric polarization, said ceramic eletrolyte body consisting essentially of a composition ranging from an alkali metal beta"-alumina phase to a mixture of alkali metal beta"-alumina phase and up to about 50% by volume of alkali metal beta-alumina phase based on the total volume of said electrolyte body, said alkali metal being selected from the group consisting of sodium, potassium, lithium, mixtures thereof and alloys thereof.
Claim 3
Dependent Claim
26 words
The ceramic electrolyte of claim 1 in the form of a hollow tube closed at one end and useful as an electrolyte in a sodium-sulfur cell.
Claim 4
Dependent Claim
65 words
A cationically-conductive ceramic electrolyte body wherein its entire surface is a chemically etched surface, said ceramic electrolyte body being of symmetric polarization, said ceramic electrolyte body consisting essentially of a composition ranging from a sodium beta"-alumina phase to a mixture of sodium beta"-alumina phase and up to about 50% by volume of sodium beta alumina phase based on the total volume of said electrolyte body.
Claim 5
Dependent Claim
65 words
A cationically-conductive ceramic electrolyte body wherein its entire surface is a chemically etched surface, said ceramic electrolyte body being of symmetric polarization, said ceramic electrolyte body consisting essentially of a composition ranging from a sodium beta"-alumina phase to a mixture of sodium beta"-alumina phase and up to about 50% by volume of sodium beta alumina phase based on the total volume of said electrolyte body.
Claim 6
Dependent Claim
92 words
A cationically-conductive ceramic electrolyte body wherein its entire surface is a combination of a chemically etched surface and a chemically-polished surface, said ceramic electrolyte body being of symmetric polarization, said ceramic electrolyte body consisting essentially of a composition ranging from an alkali metal beta"-alumina phase to a mixture of alkali metal beta"-alumina phase and up to about 50% by volume of alkali metal beta-alumina phase based on the total volume of said electrolyte body, said alkali metal being selected from the group consisting of sodium, potassium, lithium, mixtures thereof and alloys thereof.
Claim 7
Dependent Claim
92 words
A cationically-conductive ceramic electrolyte body wherein its entire surface is a combination of a chemically etched surface and a chemically-polished surface, said ceramic electrolyte body being of symmetric polarization, said ceramic electrolyte body consisting essentially of a composition ranging from an alkali metal beta"-alumina phase to a mixture of alkali metal beta"-alumina phase and up to about 50% by volume of alkali metal beta-alumina phase based on the total volume of said electrolyte body, said alkali metal being selected from the group consisting of sodium, potassium, lithium, mixtures thereof and alloys thereof.
Claim 8
Dependent Claim
26 words
The ceramic body of claim 4 in the form of a hollow tube closed at one end and useful as an electrolyte in a sodium-sulfur cell.
Claim 9
Dependent Claim
71 words
A cationically-conductive ceramic electrolyte body wherein its entire surface is a combination of a chemically etched surface and a chemically polished surface, said ceramic electrolyte body being of symmetric polarization, said ceramic electrolyte body consisting essentially of a composition ranging from sodium beta"-alumina phase to a mixture of sodium beta"-alumina phase and up to about 50% by volume of sodium beta-alumina phase based on the total volume of said electrolyte body.
Claim 10
Dependent Claim
71 words
A cationically-conductive ceramic electrolyte body wherein its entire surface is a combination of a chemically etched surface and a chemically polished surface, said ceramic electrolyte body being of symmetric polarization, said ceramic electrolyte body consisting essentially of a composition ranging from sodium beta"-alumina phase to a mixture of sodium beta"-alumina phase and up to about 50% by volume of sodium beta-alumina phase based on the total volume of said electrolyte body.
Claim 11
Dependent Claim
85 words
A cationically-conductive ceramic electrolyte body wherein its entire surface is a chemically-etched surface or a combination of a chemically etched surface and a chemically polished surface, said ceramic electrolyte body being of symmetric polarization, said ceramic electrolyte body consisting essentially of a composition ranging from sodium beta"-alumina phase to a mixture of sodium beta"-alumina phase and up to about 50% by volume of sodium beta-alumina phase based on the total volume of said electrolyte body, said body containing a stabilizer for said sodium beta"-alumina phase.
Claim 12
Dependent Claim
85 words
A cationically-conductive ceramic electrolyte body wherein its entire surface is a chemically-etched surface or a combination of a chemically etched surface and a chemically polished surface, said ceramic electrolyte body being of symmetric polarization, said ceramic electrolyte body consisting essentially of a composition ranging from sodium beta"-alumina phase to a mixture of sodium beta"-alumina phase and up to about 50% by volume of sodium beta-alumina phase based on the total volume of said electrolyte body, said body containing a stabilizer for said sodium beta"-alumina phase.
Claim 13
Dependent Claim
27 words
The cationically-conductive ceramic electrolyte body of claim 7, wherein said stabilizer is selected from the group consisting of LiO 2 , MgO, NiO, CoO and mixtures thereof.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-01-09 | 1987-07-11 | 1988-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-09 | 1991-07-11 | 1992-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-09 | 1995-07-11 | 1996-01-10 | $7700.00 | Window Closed / Lapsed |