US3769092A
Expired / Lapsed
US
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Non-aqueous electrolytes
Assignee: SAFT Societe des Accumulateurs Fixes et de Traction SA
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Filing: 1971-07-14
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Granted: 1973-10-30
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Expires: 1991-07-14
Abstract
Abstract Non-aqueous electrolytes for use in electrochemical cells with a lithium anode and metal sulfide or metal oxide cathode such as copper sulfide or copper oxide. The electrolyte is a purified solvent such as tetrahydrofuran or a purified mixture of tetrahydrofuran and dimethoxyethane with dehydrated lithium perchlorate solute and a stabilizing agent such as triethyl or tributylphosphite.
Inventors
- 👤 V Dechenaux
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 00:11
CPC Classifications
H; H01; H01M; H01M6/00; H01M6/14; H01M6/16; H01M6/162; H01M6/164; H01M6/168; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
25 words
A non-aqueous electrolyte according to claim 1, wherein the concentration of the said stabilizing agent in said electrolyte is about 0.1% to 1% by weight.
Claim 2
Dependent Claim
19 words
A non-aqueous electrolyte according to claim 1, having a water content ranging from about 0.005% to 0.01% by weight.
Claim 3
Dependent Claim
34 words
An electrolyte according to claim 1 wherein the solvent comprises about 62% by weight of tetrahydrofuran, about 27% by weight of 1-2 dimethoxyethane and the solute is about 11% by weight of lithium perchlorate.
Claim 4
Dependent Claim
70 words
A non-aqueous electrolyte for use in an electric cell equipped with a lithium anode and a cathode selected from the group consisting of a metal sulfide and a metal oxide consisting of about 62% by weight of tetrahydrofuran, about 27% by weight of 1-2 dimethoxyethane, about 11% by weight of lithium perchlorate and about 0.1% by weight of a stabilizer agent selected from the group consisting of triethylphosphite and tributylphosphite.
Claim 5
Dependent Claim
64 words
An electric cell comprising a lithium anode, a cathode selected from the group consisting of copper sulfide and copper oxide and a non-aqueous electrolyte consisting of about 62% by weight of tetrahydrofuran, about 27% by weight of 1-2 dimethoxyethane, about 11% by weight of lithium perchlorate and about 0.1% by weight of a stabilizer agent selected from the group consisting of triethylphosphite and tributylphosphite.
Claim 6
Independent Claim
51 words
A method for preparing a non-aqueous electrolyte comprising purifying in a first step tetrahydrofuran and dimethoxyethane, then dissolving dehydrated lithium perchlorate progressively in the tetrahydrofuran at a temperature maintained at about 25* C. and adding purified dimethoxyethane thereto and a stabilizing agent selected from the group consisting of triethylphosphite and tributylphosphite.
Claim 7
Dependent Claim
28 words
A method according to claim 7 wherein purification of the tetrahydrofuran and dimethoxyethane is effected by passing them through a molecular sieve with openings of about 4 A.
Claim 8
Dependent Claim
17 words
A method according to claim 7 wherein purification of the tetrahydrofuran and dimethoxyethane is effected by distillation.
Claim 9
Dependent Claim
25 words
A method according to claim 7 wherein dehydration of said lithium perchlorate is effected by drying it for about a week at about 150* C.
References Cited (Backward Citations)
US3511716A
Cited
US3544385A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-29 | 1977-04-30 | 1977-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-29 | 1981-04-30 | 1981-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-29 | 1985-04-30 | 1985-10-30 | $7700.00 | Window Closed / Lapsed |