US4491625A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Zinc-bromine batteries with improved electrolyte
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1984-03-26
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Granted: 1985-01-01
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Expires: 2004-03-26
Abstract
Abstract The coulombic efficiency of aqueous zinc bromine batteries can be increased if, in addition to the bromide ions required to be present in the electrolyte to charge the cell to rated capacity, chloride ions are added to the electrolyte in amounts sufficient to reduce the amount of free bromine present in the electrolyte during operation of the cell.
Inventors
- 👤 Edward Kantner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:03
CPC Classifications
H; H01; H01M; H01M10/00; H01M10/36; H01M10/365; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
114 words
An electrochemical cell having a zinc bromine couple, said cell comprising an electrode structure on which zinc is deposited during charging of the cell, a counterelectrode structure at which to generate cathodic bromine during charging of the cell, an aqueous electrolyte comprising a water soluble complexing agent selected from the group consisting of N-methyl, N-ethyl morphilinium bromide, N-methyl, N-ethyl pyrrolidinium bromide, N-methyl, N-ethyl pyrrolidium bromide, N-methyl, N-ethyl piperidinium bromide and mixtures thereof capable of forming a water immiscible complex with bromine, from about 1 to 3 moles per liter zinc bromide and chloride ions in an amount sufficient to reduce the amount of free bromine present in said electrolyte during charging of said cell.
Claim 2
Dependent Claim
114 words
An electrochemical cell having a zinc bromine couple, said cell comprising an electrode structure on which zinc is deposited during charging of the cell, a counterelectrode structure at which to generate cathodic bromine during charging of the cell, an aqueous electrolyte comprising a water soluble complexing agent selected from the group consisting of N-methyl, N-ethyl morphilinium bromide, N-methyl, N-ethyl pyrrolidinium bromide, N-methyl, N-ethyl pyrrolidium bromide, N-methyl, N-ethyl piperidinium bromide and mixtures thereof capable of forming a water immiscible complex with bromine, from about 1 to 3 moles per liter zinc bromide and chloride ions in an amount sufficient to reduce the amount of free bromine present in said electrolyte during charging of said cell.
Claim 3
Dependent Claim
30 words
The cell of claim 1 wherein said electrolyte contains from about 1.5 to 2.5 moles per liter of zinc bromide and from 0.5 to 1.75 moles per liter chloride ions.
Claim 4
Dependent Claim
23 words
The cell of claim 2 wherein said electrolyte contains 0.5 to 1.75 moles of zinc chloride as the source of said chloride ions.
Claim 5
Dependent Claim
17 words
The cell of claim 3 wherein said electrolyte contains from about 0.8 to 1.2 moles/liter zinc chloride.
Claim 6
Independent Claim
97 words
A method of enhanching the coulomic efficiency of electrochemical cells employing an aqueous zinc bromide electrolyte containing sufficient bromide ion in said solution to support substantially all of the rated capacity of the cell and a water soluble complexing agent selected from the group consisting of N-methyl, N-ethyl morphilinium bromide, N-methyl, N-ethyl pyrrolidinium bromide, N-methyl, N-ethyl pyrrolidium bromide, N-methyl, N-ethyl piperidinium bromide and mixtures thereof capable of forming a water immiscible complex with bromine said method comprising adding sufficient chloride ions to reduce the amount of free bromine present in said electrolyte during charging of said cell.
Claim 7
Independent Claim
97 words
A method of enhanching the coulomic efficiency of electrochemical cells employing an aqueous zinc bromide electrolyte containing sufficient bromide ion in said solution to support substantially all of the rated capacity of the cell and a water soluble complexing agent selected from the group consisting of N-methyl, N-ethyl morphilinium bromide, N-methyl, N-ethyl pyrrolidinium bromide, N-methyl, N-ethyl pyrrolidium bromide, N-methyl, N-ethyl piperidinium bromide and mixtures thereof capable of forming a water immiscible complex with bromine said method comprising adding sufficient chloride ions to reduce the amount of free bromine present in said electrolyte during charging of said cell.
Claim 8
Dependent Claim
17 words
The method of claim 5 wherein 0.5 to 1.75 moles per liter of zinc chloride is added.
Claim 9
Dependent Claim
18 words
The method of claim 6 wherein from 0.8 to 1.2 moles per liter of zinc chloride is added.
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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) | 1988-01-01 | 1988-07-02 | 1989-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-01-01 | 1992-07-02 | 1993-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-01-01 | 1996-07-02 | 1997-01-01 | $7700.00 | Window Closed / Lapsed |