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Patent US4547441A successfully refreshed from Google Patents.
US4547441A
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Electrochemical cell with negative active material based on an alkali or alkaline earth metal
Assignee: SAFT Societe des Accumulateurs Fixes et de Traction SA
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Filing: 1984-12-28
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Granted: 1985-10-15
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Expires: 2004-12-28
Abstract
Abstract In an electrochemical cell the negative active material is an alkali or alkaline earth metal, such as lithium, and the electrolyte comprises a solute and at least one solvent selected from the liquid oxyhalides and which serves also as the positive active material. The electrolyte further comprises a mineral substance the effect of which is to significantly reduce the voltage rise delay of the cell.
Inventors
- 👤 Didier Vallin
- 👤 Jean-Yves Grassien
- 👤 Philippe Chenebault
- 👤 Alain Kerouanton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:43
CPC Classifications
H; H01; H01M; H01M6/00; H01M6/14; G; G01; G01N; G01N2291/00; G01N2291/02; G01N2291/028; G01N2291/02809; G01N2291/02881; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
114 words
Electrochemical cell comprising a negative active material based on an alkali or alkaline earth metal and an electrolyte containing a solute and at least one solvent selected from the group consisting of the liquid oxyhalides, the electrolyte also constituting the positive active material and containing at least one mineral substance selected from the group consisting of the alkali or alkaline earth polyhalogenosulfatometallate having the formula MM' m (SO 3 X) n in which M is said alkali or alkaline earth metal, M' is selected from the group consisting of Al, B, Ga, In, V, Sb, Nb, Si, W and Ta, and X is selected from the group consisting of chlorine, fluorine, bromine and iodine.
Claim 2
Dependent Claim
114 words
Electrochemical cell comprising a negative active material based on an alkali or alkaline earth metal and an electrolyte containing a solute and at least one solvent selected from the group consisting of the liquid oxyhalides, the electrolyte also constituting the positive active material and containing at least one mineral substance selected from the group consisting of the alkali or alkaline earth polyhalogenosulfatometallate having the formula MM' m (SO 3 X) n in which M is said alkali or alkaline earth metal, M' is selected from the group consisting of Al, B, Ga, In, V, Sb, Nb, Si, W and Ta, and X is selected from the group consisting of chlorine, fluorine, bromine and iodine.
Claim 3
Dependent Claim
20 words
Cell according to claim 1, wherein the concentration of said mineral substance is greater than 0.01% by weight of electrolyte.
Claim 4
Dependent Claim
12 words
Cell according to claim 1, wherein said electrolyte further contains sulfur dioxide.
Claim 5
Dependent Claim
26 words
Cell according to claim 1, wherein said liquid oxyhalide is thionyl chloride, said alkali metal is lithium and said solute has the formula LiM'Cl x .
Claim 6
Dependent Claim
20 words
Cell according to claim 4, wherein the solute of said electrolyte is lithium tetrachloroaluminate with the formula LiAlCl 4 .
Claim 7
Dependent Claim
21 words
Cell according to claim 5, wherein said mineral substance is a lithium tetrachlorosulfatoaluminate with the formula LiAl(SO 3 Cl) 4 .
Claim 8
Dependent Claim
23 words
Cell according to claim 4, wherein said electrolyte further comprises sulfur dioxide and the molar ratio of M':SO 2 is greater than 1.5:1.
Claim 9
Dependent Claim
29 words
Cell according to claim 1, wherein said liquid oxyhalide is thionyl chloride, said alkali metal is sodium and said solute is sodium tetrachloroaluminate with the formula NaAlCl 4 .
Claim 10
Dependent Claim
20 words
Cell according to claim 8, wherein said mineral substance is sodium chlorosulfatoaluminate with the formula NaAl(SO 3 Cl) 4 .
Claim 11
Dependent Claim
15 words
Cell according to clam 1, wherein said mineral substance is added directly to said electrolyte.
Claim 12
Dependent Claim
15 words
Cell according to clam 1, wherein said mineral substance is added directly to said electrolyte.
Claim 13
Dependent Claim
52 words
Cell according to claim 1, wherein said mineral substance is formed in situ by reacting said electrolyte with a substance selected from the group consisting of HSO 3 X, SO 3 , H 2 SO 4 and mixtures thereof, X being selected from the group consisting of chlorine, fluorine, bromine and iodine.
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) | 1988-10-14 | 1989-04-15 | 1989-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-10-14 | 1993-04-15 | 1993-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-10-14 | 1997-04-15 | 1997-10-15 | $7700.00 | Window Closed / Lapsed |