US4018971A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gels as battery separators for soluble electrode cells
Assignee: National Aeronautics and Space Administration
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Filing: 1976-07-20
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Granted: 1977-04-19
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Expires: 1996-07-20
Abstract
Abstract Gels are formed from silica powders and hydrochloric acid. The gels can then be impregnated into a polymeric foam and the resultant sheet material can then be used in applications where the transport of chloride ions is desired. Specifically disclosed is the utilization of the sheet in electrically rechargable redox flow cells which find application in bulk power storage systems.
Inventors
- 👤 Dean W. Sheibley
- 👤 Randall F. Gahn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:55
CPC Classifications
H; H01; H01M; H01M8/00; H01M8/18; H01M8/184; H01M8/188; H01M50/00; H01M50/40; H01M50/409; H01M50/449; H01M50/451; H01M50/489; H01M50/491; H01M50/411; H01M50/414; H01M50/417; H01M50/457; Y; Y02; Y02E; Y02E60/00; Y02E60/10; Y02E60/30; Y02E60/50
Claims Analysis
Total Claims: 30
Claim 1
Independent Claim
13 words
An ion transport medium comprising a gel of hydrochloric acid and powdered silica.
Claim 2
Dependent Claim
13 words
An ion transport medium comprising a gel of hydrochloric acid and powdered silica.
Claim 3
Dependent Claim
19 words
The ion transport medium of claim 1, wherein said hydrochloric acid is from about 0.5 to about 12 Normal.
Claim 4
Dependent Claim
29 words
The ion transport medium of claim 1, wherein said powdered silica is present in an amount of from about 5 to about 20% by weight of said hydrochloric acid.
Claim 5
Dependent Claim
14 words
The ion transport medium of claim 1, wherein said gel further comprises a silicate.
Claim 6
Dependent Claim
27 words
The ion transport medium of claim 4, wherein said silicate is selected from the group consisting of magnesium lithium silicate, lithium aluminum silicate and magnesium zirconium silicate.
Claim 7
Dependent Claim
22 words
The ion transport medium of claim 1, wherein said powdered silica has a surface area of about 100 square meters per gram.
Claim 8
Dependent Claim
22 words
The ion transport medium of claim 1, wherein said powdered silica has an average particle size of less than about 0.1 micron.
Claim 9
Dependent Claim
23 words
An ionic transport membrane comprising a microporous substrate which contains an ion transport medium comprising a gel of hydrochloric acid and powdered silica.
Claim 10
Dependent Claim
23 words
An ionic transport membrane comprising a microporous substrate which contains an ion transport medium comprising a gel of hydrochloric acid and powdered silica.
Claim 11
Dependent Claim
19 words
The ionic transport membrane of claim 8, wherein said hydrochloric acid is from about 0.5 to about 12 Normal.
Claim 12
Dependent Claim
28 words
The ionic transport membrane of claim 8, wherein said powdered silica is present in an amount from about 5 to about 20% by weight of said hydrochloric acid.
Claim 13
Dependent Claim
14 words
The ionic transport membrane of claim 8, wherein said gel further comprises a slicate.
Claim 14
Dependent Claim
27 words
The ionic transport membrane of claim 11, wherein said silicate is selected from the group consisting of magnesium lithium silicate, lithium aluminum silicate and magnesium zirconium silicate.
Claim 15
Dependent Claim
22 words
The ionic transport membrane of claim 8, wherein said powdered silica has a surface area of about 100 square meters per gram.
Claim 16
Dependent Claim
22 words
The ionic transport membrane of claim 8, wherein said powdered silica has an average particle size of less than about 0.1 micron.
Claim 17
Dependent Claim
22 words
The ionic transport membrane of claim 8, wherein said microporous substrate has a void volume of over about 40% without said gel.
Claim 18
Dependent Claim
15 words
The ionic transport membrane of claim 8, wherein said microporous substrate is an organic polymer.
Claim 19
Dependent Claim
19 words
The ionic transport membrane of claim 8, wherein said membrane has a resistance of less than about 0.5 ohms.
Claim 20
Dependent Claim
45 words
An electrical storage device comprising an anode, an anodic fluid, a cathode, a cathodic fluid and between said anodic and cathodic fluid, an inoic transport membrane comprising a microporous substrate which contains an ion transport medium comprising a gel of hydrochloric acid and powdered silica.
Claim 21
Dependent Claim
45 words
An electrical storage device comprising an anode, an anodic fluid, a cathode, a cathodic fluid and between said anodic and cathodic fluid, an inoic transport membrane comprising a microporous substrate which contains an ion transport medium comprising a gel of hydrochloric acid and powdered silica.
Claim 22
Dependent Claim
19 words
The electrical storage device of claim 18, wherein said hydrochloric acid is from about 0.5 to about 12 Normal.
Claim 23
Dependent Claim
29 words
The electrical storage device of claim 18, wherein said powdered silica is present in an amount of from about 5 to about 20% by weight of said hydrochloric acid.
Claim 24
Dependent Claim
14 words
The electrical storage device of claim 18, wherein said gel further comprises a silicate.
Claim 25
Dependent Claim
27 words
The electrical storage device of claim 21, wherein said silicate is selected from the group consisting of magnesium lithium silicate, lithium aluminum silicate and magnesium zirconium silicate.
Claim 26
Dependent Claim
22 words
The electrical storage device of claim 18, wherein said powdered silica has a surface area of about 100 square meters per gram.
Claim 27
Dependent Claim
22 words
The electrical storage device of claim 18, wherein said powdered silica has an average particle size of less than about 0.1 micron.
Claim 28
Dependent Claim
22 words
The electrical storage device of claim 18, wherein said microporous substrate has a void volume of over about 40% without said gel.
Claim 29
Dependent Claim
15 words
The electrical storage device of claim 18, wherein said microporous substrate is an organic polymer.
Claim 30
Dependent Claim
19 words
The electrical storage device of claim 18, wherein said membrane has a resistance of less than about 0.5 ohms.
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) | 1980-04-18 | 1980-10-18 | 1981-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-18 | 1984-10-18 | 1985-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-18 | 1988-10-18 | 1989-04-19 | $7700.00 | Window Closed / Lapsed |