Patent US4057678A successfully refreshed from Google Patents.
US4057678A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Molten salt battery having inorganic paper separator
Assignee: Energy Research and Development Administration ERDA
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Filing: 1977-03-16
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Granted: 1977-11-08
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Expires: 1997-03-16
Abstract
Abstract A high temperature secondary battery comprises an anode containing lithium, a cathode containing a chalcogen or chalcogenide, a molten salt electrolyte containing lithium ions, and a separator comprising a porous sheet comprising a homogenous mixture of 2-20 wt.% chrysotile asbestos fibers and the remainder inorganic material non-reactive with the battery components. The non-reactive material is present as fibers, powder, or a fiber-powder mixture.
Inventors
- 👤 Robert D. Walker, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:13
CPC Classifications
D; D21; D21H; D21H5/00; D21H5/12; D21H5/18; D21H13/00; D21H13/36; D21H13/38; D21H13/42; H; H01; H01M; H01M10/00; H01M10/36; H01M10/39; H01M10/399; H01M50/00; H01M50/40; H01M50/409; H01M50/431; H01M50/434; H01M50/44; H01M50/489; H01M50/491; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
90 words
In a molten salt battery comprising an anode containing metallic lithium, a cathode containing a chalcogen or chalcogenide, a molten salt electrolyte containing lithium ions in contact with said anode and said cathode, and a porous separator disposed between said anode and cathode for providing electrical insulation and ionic transport between said anode and cathode, the improvement wherein said separator comprises a porous sheet comprising a homogeneous mixture of 2-20 wt.% chrysotile asbestos fibers and the remainder of said homogeneous mixture inorganic material non-reactive with the anode and the electrolyte.
Claim 2
Dependent Claim
90 words
In a molten salt battery comprising an anode containing metallic lithium, a cathode containing a chalcogen or chalcogenide, a molten salt electrolyte containing lithium ions in contact with said anode and said cathode, and a porous separator disposed between said anode and cathode for providing electrical insulation and ionic transport between said anode and cathode, the improvement wherein said separator comprises a porous sheet comprising a homogeneous mixture of 2-20 wt.% chrysotile asbestos fibers and the remainder of said homogeneous mixture inorganic material non-reactive with the anode and the electrolyte.
Claim 3
Dependent Claim
15 words
The battery of claim 1 in which said separator is in contact with said anode.
Claim 4
Dependent Claim
15 words
The battery of claim 1 in which said separator is in contact with said cathode.
Claim 5
Dependent Claim
19 words
The battery of claim 1 in which said separator is held in compression between said anode and said cathode.
Claim 6
Dependent Claim
34 words
The battery of claim 1 in which said material non-reactive with the anode and electrolyte is present at least 10 wt.% as fibers 0.5-10 microns in diameter and having an aspect ratio of 10-500.
Claim 7
Dependent Claim
29 words
The battery of claim 1 in which said material non-reactive with anode and electrolyte is present as fibers 0.5-10 microns in diameter and having an aspect ratio of 10-500.
Claim 8
Dependent Claim
23 words
The battery of claim 1 in which said chrysotile asbestos fiber is present within the range of 5-10 wt.% in said homogeneous mixture.
Claim 9
Dependent Claim
70 words
The battery of claim 1 in which said inorganic material inert to the anode and to the electrolyte is selected from the group of BN, Y 2 O 3 , LiAlO 2 , AlN, BeO, K 2 TiO 3 , Al 2 O 3 , ZrO 2 , CaO, Y 3 Al 5 O 12 , Mg 3 Al 5 O 12 , Mg 3 Y 2 O 6 .
Claim 10
Dependent Claim
16 words
The battery of claim 1 in which said homogeneous mixture further comprises 10-60 wt.% MgO powder.
Claim 11
Dependent Claim
16 words
The battery of claim 1 in which said non-reactive material is Y 2 O 3 .
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) | 1980-11-07 | 1981-05-09 | 1981-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-11-07 | 1985-05-09 | 1985-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-11-07 | 1989-05-09 | 1989-11-08 | $7700.00 | Window Closed / Lapsed |