Patent US3738870A successfully refreshed from Google Patents.
US3738870A
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US
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Storage batteries containing zinc halide in an aqueous solution of the type having a soluble cathode and a dissolved anode
Assignee: Consiglio Nazionale delle Richerche
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Filing: 1971-08-11
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Granted: 1973-06-12
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Expires: 1991-08-11
Abstract
Abstract An improved reversible electric cell of the type which includes a soluble metal cathode, a chemically non-reactive electrode and an electrolyte comprising an aqueous solution of a metal halide is disclosed. The electrode is provided with open channels or grooves in which a dispersion, of paste-like consistency, is disposed. The dispersion or mixture comprises an inert conducting powder and an alkylammonium perchlorate. The alkylammonium perchlorate combines with the halogen released upon charging to form an addition product in a solid state. This prevents the halogen from being dissolved in the electrolyte during the charging cycle which would corrode soluble metal cathode and discharge the cell.
Inventors
- 👤 M Rossi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:22
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
71 words
A reversible electric cell which comprises a zinc cathode, an electrolyte formed of an aqueous solution of zinc bromide, a chemically non-reactive electrode which carries a dispersion of powdered graphite soaked in a salt, said salt selected from the group consisting of tetramethylammonium perchlorate and tetrabutylammonium perchlorate, said graphite electrode being in contact with said electrolyte and with said dispersion, said dispersion absorbing bromine during charging and restoring bromine during discharging.
Claim 2
Dependent Claim
101 words
An improved electric cell comprising a soluble metal cathode, selected from the group consisting of zinc and cadmium said metal having a high electromotive value; a chemically non-reactive solid positive electrode and an electrolyte formed of a solution of a halide selected from the group consisting of chlorine, bromine, and iodine, of said cathodic metal; said positive electrode having open channels in lateral contact with said electrolyte and having disposed therein a homogeneous conductive dispersion or suspension of an inert conductive powder and an alkylammonium perchlorate selected from the group consisting of tetramethylammonium perchlorate, tetrabutylammonium perchlorate, tetraethylammonium perchlorate, and cetiltrimethylammonium perchlorate.
Claim 3
Dependent Claim
32 words
The electric cell in accordance with claim 3 wherein said soluble cathodic metal is zinc, said solid positive electrode is graphite, said halide is bromine and said alkylammonium perchlorate is tetramethylammonium perchlorate.
Claim 4
Dependent Claim
27 words
The reversible electric cell in accordance with claim 3 wherein said alkylammonium perchlorate is tetramethylammonium perchlorate and wherein said conducting substance in powdered form is powdered graphite.
Claim 5
Dependent Claim
15 words
The reversible electric cell in accordance with claim 5 wherein said dispersion further includes charcoal.
Claim 6
Dependent Claim
15 words
The reversible electric cell in accordance with claim 3 wherein said open channels are wedge-Shaped.
Claim 7
Dependent Claim
16 words
The reversible electric cell in accordance with claim 3 wherein said open channels are substantially L-shaped.
Claim 8
Dependent Claim
125 words
A battery including a series of reversible electric cells, said cells each comprising a zinc cathode, and a chemically non-reactive positive electrode, said positive electrode having a series of open channels therein, said channels being in lateral contact with an electrolyte formed of an aqueous solution of a zinc halide, said zinc halide selected from the group consisting of zinc bromide and zinc iodide, said channels further being in intimate contact with a paste-like mixture comprising an alkylammonium perchlorate and a conductive powder, said alkylammonium perchlorate in said mixture serving to combine with free halide during the charging cycle of said battery and form a solid addition product thereof and means for recycling said electrolyte to and from said series of cells for said battery.
Claim 9
Dependent Claim
21 words
The battery in accordance with claim 9 wherein said alkylammonium perchlorate is tetramethylammonium perchlorate and said conductive powder is powdered graphite.
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) | 1976-06-11 | 1976-12-11 | 1977-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-11 | 1980-12-11 | 1981-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-11 | 1984-12-11 | 1985-06-12 | $7700.00 | Window Closed / Lapsed |