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US4440837A
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Positive electrode current collector for liquid metal cells
Assignee: United States Department of Energy
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Filing: 1982-09-27
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Granted: 1984-04-03
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Expires: 2002-09-27
Abstract
Abstract A current collector for the positive electrode of an electrochemical cell with a positive electrode including a sulfide. The cell also has a negative electrode and a molten salt electrolyte including halides of a metal selected from the alkali metals and the alkaline earth metals in contact with both the positive and negative electrodes. The current collector has a base metal of copper, silver, gold, aluminum or alloys thereof with a coating thereon of iron, nickel, chromium or alloys thereof. The current collector when subjected to cell voltage forms a sulfur-containing compound on the surface thereby substantially protecting the current collector from further attack by sulfur ions during cell operation. Both electroless and electrolytic processes may be used to deposit coatings.
Inventors
- 👤 Hiroshi Shimotake
- 👤 Louis G. Bartholme
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:07
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/02; H01M4/64; H01M4/66; H01M4/661; H01M10/00; H01M10/36; H01M10/39; H01M10/399; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
105 words
An electrochemical cell comprising a positive electrode including a sulfide, a negative electrode, a molten salt electrolyte including halides of a metal selected from the alkali metals and the alkaline earth metals in contact with both said positive and negative electrodes, said positive electrode having a current collector selected from the group consisting of copper, aluminum and alloys thereof with an iron coating thereon deposited electrolytically on said current collector from an iron chloride bath, whereby said current collector when subjected to cell voltage forming a sulfur-containing compound on the surface thereof thereby substantially protecting said current collector from further sulfur ions during cell operation.
Claim 2
Dependent Claim
105 words
An electrochemical cell comprising a positive electrode including a sulfide, a negative electrode, a molten salt electrolyte including halides of a metal selected from the alkali metals and the alkaline earth metals in contact with both said positive and negative electrodes, said positive electrode having a current collector selected from the group consisting of copper, aluminum and alloys thereof with an iron coating thereon deposited electrolytically on said current collector from an iron chloride bath, whereby said current collector when subjected to cell voltage forming a sulfur-containing compound on the surface thereof thereby substantially protecting said current collector from further sulfur ions during cell operation.
Claim 3
Dependent Claim
23 words
The electrochemical cell of claim 1, wherein said coating has a thickness in the range of between about 10 and about 20 mils.
Claim 4
Dependent Claim
27 words
The electrochemical cell of claim 1, wherein said chloride bath is maintained at a temperature of not less than about 85° C. during the deposition of iron.
Claim 5
Dependent Claim
15 words
The electrochemical cell of claim 1, wherein said iron chloride bath contains FeCl 2 .
Claim 6
Dependent Claim
18 words
The electrochemical cell of claim 1, wherein said iron chloride bath contains FeCl 2 and MnCl 2 .
Claim 7
Dependent Claim
18 words
The electrochemical cell of claim 1, wherein said iron chloride bath contains iron chloride and AlCl 3 .
Claim 8
Dependent Claim
20 words
The electrochemical cell of claim 1, wherein said iron chloride bath contains FeCl 2 MnCl 2 and AlCl 3 .
Claim 9
Dependent Claim
21 words
The electrochemical cell of claim 7, wherein said iron chloride bath contains a greater amount of magnesium chloride than magnesium chloride.
Claim 10
Dependent Claim
29 words
The electrochemical cell of claim 7, wherein said iron chloride bath contains a ratio of magnesium chloride and aluminum chloride to iron chloride slightly greater than 1 to 10.
Claim 11
Dependent Claim
88 words
A current collector for an electrochemical cell comprising a metal base selected from the group consisting of copper, aluminum and alloys thereof with an iron coating thereon deposited electrolytically on said metal base from an iron chloride bath, and electrical terminal means connected to said metal base, whereby said current collector when subjected to cell voltage in an electrochemical cell having a sulfide-containing positive electrode forming a sulfur-containing compound on the surface thereof thereby substantially protecting said current collector from further attack by sulfur ions during cell operation.
Claim 12
Dependent Claim
88 words
A current collector for an electrochemical cell comprising a metal base selected from the group consisting of copper, aluminum and alloys thereof with an iron coating thereon deposited electrolytically on said metal base from an iron chloride bath, and electrical terminal means connected to said metal base, whereby said current collector when subjected to cell voltage in an electrochemical cell having a sulfide-containing positive electrode forming a sulfur-containing compound on the surface thereof thereby substantially protecting said current collector from further attack by sulfur ions during cell operation.
Claim 13
Dependent Claim
27 words
The current collector of claim 10, wherein said chloride bath is maintained at a temperature of not less than about 85° C. during the deposition of iron.
Claim 14
Dependent Claim
15 words
The current collector of claim 10, wherein said iron chloride bath contains FeCl 2 .
Claim 15
Dependent Claim
18 words
The current collector of claim 10, wherein said iron chloride bath contains FeCl 2 and MnCl 2 .
Claim 16
Dependent Claim
18 words
The current collector of claim 10, wherein said iron chloride bath contains FeCl 2 and AlCl 3 .
Claim 17
Dependent Claim
21 words
The current collector of claim 10, wherein said iron chloride bath contains FeCl 2 , MnCl 2 and AlCl 3 .
Claim 18
Dependent Claim
21 words
The current collector of claim 15, wherein said iron chloride bath contains a greater amount of aluminum chloride than magnesium chloride.
Claim 19
Dependent Claim
29 words
The current collector of claim 15, wherein said iron chloride bath contains a ratio of magnesium chloride and aluminum chloride to iron chloride slightly greater than 1 to 10.
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) | 1987-04-03 | 1987-10-03 | 1988-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-04-03 | 1991-10-03 | 1992-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-04-03 | 1995-10-03 | 1996-04-03 | $7700.00 | Window Closed / Lapsed |