US5154987A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Highly conductive electrolyte composites containing glass and ceramic, and method of manufacture
Assignee: United States Department of Energy
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Filing: 1990-07-17
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Granted: 1992-10-13
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Expires: 2010-07-17
Abstract
Abstract An electrolyte composite is manufactured by pressurizing a mixture of sodium ion conductive glass and an ionically conductive compound at between 12,000 and 24,000 pounds per square inch to produce a pellet. The resulting pellet is then sintered at relatively lower temperatures (800° C.-1200° C.), for example 1000° C., than are typically required (1400° C.) when fabricating single constituent ceramic electrolytes. The resultant composite is 100 percent conductive at 250° C. with conductivity values of 2.5 to 4×10 -2 (ohm-cm) -1 . The matrix exhibits chemical stability against sodium for 100 hours at 250° to 300° C.
Inventors
- 👤 Mark C. Hash
- 👤 Ira D. Bloom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:45
CPC Classifications
H; H01; H01M; H01M10/00; H01M10/36; H01M10/39; H01M10/3909; H01M10/3918; C; C03; C03C; C03C14/00; C03C14/004; C03C2214/00; C03C2214/04; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
65 words
A method of fabricating electrolyte composites comprising: mixing sodium-ion conductive glass with an ionically conductive compound in a 50:50 weight percent ratio to produce a mixture where the sodium ion conductive glass wets the ionically conductive compound; shaping the mixture by pressing between 12,000 pounds per square inch and 24,000 pounds per square inch; and heating the mixture at a temperature less than 1400° C.
Claim 2
Independent Claim
65 words
A method of fabricating electrolyte composites comprising: mixing sodium-ion conductive glass with an ionically conductive compound in a 50:50 weight percent ratio to produce a mixture where the sodium ion conductive glass wets the ionically conductive compound; shaping the mixture by pressing between 12,000 pounds per square inch and 24,000 pounds per square inch; and heating the mixture at a temperature less than 1400° C.
Claim 3
Dependent Claim
29 words
A method as recited in claim 1 wherein the conductive compound is selected from the group consisting of β-alumina, β'-alumina, β"-alumina, sodium yttrium oxide, NASICON ceramic and combinations thereof.
Claim 4
Dependent Claim
13 words
A method as recited in claim 1 wherein the conductive compound is β"-alumina.
Claim 5
Dependent Claim
21 words
A method as recited in claim 1 wherein said temperature is provided in a range between 800° C. and 1200° C.
Claim 6
Dependent Claim
15 words
A method as recited in claim 1 wherein the mixture is heated at 1000° C.
Claim 7
Dependent Claim
42 words
A method as recited in claim 1 wherein the conductive glass is a high soda glass selected from the group consisting of (Na 2 O)(Al 2 O 3 )(Si 2 O), (Na 2 O)(ZrO 2 ), (SiO 2 ), and combinations thereof.
Claim 8
Dependent Claim
34 words
A method as recited in claim 1 wherein the conductive glass comprises 35 to 45 mole percent Na 2 O, 0.5 to 5 percent Al 2 O 3 and the remainder SiO 2 .
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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) | 1995-10-13 | 1996-04-13 | 1996-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-10-13 | 2000-04-13 | 2000-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-10-13 | 2004-04-13 | 2004-10-13 | $7700.00 | Window Closed / Lapsed |