US4544614A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Glass electrolyte composition
Assignee: United States Department of Energy
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Filing: 1985-01-08
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Granted: 1985-10-01
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Expires: 2005-01-08
Abstract
Abstract An ionically conductive glass is disclosed for use as electrolyte in a high temperature electrochemical cell, particularly a cell with sodium anode and sulfur cathode. The glass includes the constituents Na2O, ZrO2, Al2O3 and SiO2 in selected proportions to be a single phase solid solution substantially free of crystalline regions and undissolved constituents. Other advantageous properties are an ionic conductivity in excess of 2x10-3 (ohm-cm)-1 at 300 DEG C. and a glass transition temperature in excess of 500 DEG C.
Inventors
- 👤 Gene H. Kucera
- 👤 Michael F. Roche
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:27
CPC Classifications
H; H01; H01M; H01M6/00; H01M6/14; H01M6/18; H01M6/185; C; C03; C03C; C03C3/00; C03C3/04; C03C3/062; C03C4/00; C03C4/18
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
61 words
An ionically conductive glass having an ionic conductivity in excess of 2×10 -3 (ohm-cm) -1 at 300° C. comprising by mole %: 40-48% Na 2 O 6-14% ZrO 2 0.1-18% Al 2 O 3 30-52% SiO 2 said glass being substantially resistant to chemical attack by molten sodium metal, molten sulfur including polysulfides at electrochemical cell operating conditions of 300°-400° C.
Claim 2
Dependent Claim
61 words
An ionically conductive glass having an ionic conductivity in excess of 2×10 -3 (ohm-cm) -1 at 300° C. comprising by mole %: 40-48% Na 2 O 6-14% ZrO 2 0.1-18% Al 2 O 3 30-52% SiO 2 said glass being substantially resistant to chemical attack by molten sodium metal, molten sulfur including polysulfides at electrochemical cell operating conditions of 300°-400° C.
Claim 3
Dependent Claim
17 words
The ionically conductive glass of claim 1 wherein said glass is substantially clear of crystalline nuclei regions.
Claim 4
Dependent Claim
31 words
The ionically conductive glass of claim 1 wherein said glass has a transition temperature of more than 500° C. and a crystalline nucleation temperature in excess of the glass transition temperature.
Claim 5
Dependent Claim
25 words
The ionically conductive glass of claim 1 wherein said glass is substantially a single phase of clear amorphous solid solution substantially free of undissolved constituents.
Claim 6
Dependent Claim
83 words
The ionically conductive glass of claim 1 for use as electrolyte in a sodium-sulfur electrochemical cell having an ionic conductivity of at least 4×10 31 3 (ohm-cm) -1 at 300° C., a glass transition temperature in excess of 500° C., and being a single phase of clear amorphous solid solution substantially free of undissolved constituents and of crystalline regions, said glass consisting essentially of, by mole percent: 40-46% Na 2 O 6-12% ZrO 2 6-18% Al 2 O 3 30-42% SiO 2 .
Claim 7
Dependent Claim
40 words
The ionically conductive glass of claim 5 wherein said Na 2 O is in excess of 40%, said SiO 2 is not more than 40% and the combined ZrO 2 and Al 2 O 3 concentrations are more than 23%.
Claim 8
Dependent Claim
61 words
The ionically conductive glass of claim 5 wherein said glass consists essentially of by mole percent about 42% Na 2 O, 10% ZrO 2 , 16% Al 2 O 3 , and 32% SiO 2 , said glass has a glass transition temperature in excess of 600° C. and an ionic conductivity of about 4.0×10 -3 (ohm-cm) -1 at 300° C.
Claim 9
Dependent Claim
58 words
The ionically conductive glass of claim 5 prepared by forming a molten solution of said glass constituents in a single liquid phase at a temperature of 1700° C. and cooling said molten solution at a rate of 5°-10° C./sec to below its glass transition temperature to form a solid, single-phase glass substantially without undissolved constituents or crystalline regions.
Claim 10
Dependent Claim
22 words
The ionically conductive glass of claim 8 wherein said solid glass phase is annealed at a temperature below the glass transition temperature.
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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) | 1988-09-30 | 1989-04-01 | 1989-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-09-30 | 1993-04-01 | 1993-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-09-30 | 1997-04-01 | 1997-10-01 | $7700.00 | Window Closed / Lapsed |