US4853304A
Expired / Lapsed
US
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Electrolyte for secondary non-aqueous cells
Assignee: Enersys Advanced Systems Inc
•
Filing: 1988-01-21
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Granted: 1989-08-01
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Expires: 2008-01-21
Abstract
Abstract An improved non-aqueous electrolyte solution for lithium cells is disclosed which utilizes an organic ester of methyl formate together with lithium salt and an amount of CO 2 in the electrolyte solution. The active lithium anode may also be pretreated with CO 2 .
Inventors
- 👤 Walter B. Ebner
- 👤 Hsiu-Ping W. Lin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:42
CPC Classifications
H; H01; H01M; H01M10/00; H01M10/05; H01M4/00; H01M4/02; H01M4/13; H01M4/36; H01M4/38; H01M2004/026; H01M2004/027; H01M2300/00; H01M2300/0017; H01M2300/0025; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
31 words
An improved electrolyte solution for lithium non-aqueous secondary cells comprising a solution of methyl formate containing an amount of lithium salt and an amount of CO 2 in said electrolyte solution.
Claim 2
Dependent Claim
31 words
An improved electrolyte solution for lithium non-aqueous secondary cells comprising a solution of methyl formate containing an amount of lithium salt and an amount of CO 2 in said electrolyte solution.
Claim 3
Dependent Claim
20 words
The electrolyte solution of claim 1 wherein said lithium salt consists of a combination LiAsF 6 and LiBF 4 .
Claim 4
Dependent Claim
29 words
The electrolyte of claim 2 wherein the electrolyte salt is proportioned according to the relationship where: X has a value between 0.25 and 4.0 and ##EQU2## M is molarity.
Claim 5
Dependent Claim
14 words
The electrolyte of claim 2 wherein the solution is saturated with CO 2 .
Claim 6
Dependent Claim
14 words
The electrolyte of claim 3 wherein the solution is saturated with CO 2 .
Claim 7
Dependent Claim
43 words
A non-aqueous electrolyte solution for active metal cells having an active metal anode comprising: an organic ester solvent; an amount of an electrolyte salt of the active metal of the anode in said solvent; and an amount of carbon dioxide in said solution.
Claim 8
Dependent Claim
43 words
A non-aqueous electrolyte solution for active metal cells having an active metal anode comprising: an organic ester solvent; an amount of an electrolyte salt of the active metal of the anode in said solvent; and an amount of carbon dioxide in said solution.
Claim 9
Dependent Claim
12 words
The electrolyte solution of claim 6 wherein the active metal is lithium.
Claim 10
Dependent Claim
13 words
The electrolyte solution of claim 6 wherein the organic ester is a formate.
Claim 11
Dependent Claim
13 words
The electrolyte solution of claim 7 wherein the organic ester is a formate.
Claim 12
Dependent Claim
13 words
The electrolyte solution of claim 9 wherein the organic ester is methyl formate.
Claim 13
Dependent Claim
14 words
The electrolyte solution of claim 9 wherein the electrolyte salt is LiAsF 6 .
Claim 14
Dependent Claim
14 words
The electrolyte solution of claim 10 wherein said electrolyte salt is LiAsF 6 .
Claim 15
Dependent Claim
17 words
The electrolyte solution of claim 12 wherein the solution also contains an amount of LiBF 4 .
Claim 16
Dependent Claim
15 words
The electrolyte solution of claim 8 wherein the solution is saturated with CO 2 .
Claim 17
Dependent Claim
15 words
The electrolyte solution of claim 9 wherein the solution is saturated with CO 2 .
Claim 18
Dependent Claim
15 words
The electrolyte solution of claim 10 wherein the solution is saturated with CO 2 .
Claim 19
Dependent Claim
15 words
The electrolyte solution of claim 13 wherein the solution is saturated with CO 2 .
Claim 20
Independent Claim
61 words
A method for improving the operating and recharging characteristics of a non-aqueous electrochemical cell comprising an active metal anode, an electrolyte system solution including an organic ester solvent and an amount of an electrolyte salt of the metal of the anode in said solvent, and a cathode, comprising the step of, adding an amount of carbon dioxide to said electrolyte system.
Claim 21
Independent Claim
61 words
A method for improving the operating and recharging characteristics of a non-aqueous electrochemical cell comprising an active metal anode, an electrolyte system solution including an organic ester solvent and an amount of an electrolyte salt of the metal of the anode in said solvent, and a cathode, comprising the step of, adding an amount of carbon dioxide to said electrolyte system.
Claim 22
Dependent Claim
13 words
The method of claim 18 wherein said organic ester is an aliphatic ester.
Claim 23
Dependent Claim
11 words
The method of claim 19 wherein said ester is methyl formate.
Claim 24
Dependent Claim
16 words
The method of claim 18 wherein said electrolyte system solution is saturated with CO 2 .
Claim 25
Dependent Claim
16 words
The method of claim 19 wherein said electrolyte system solution is saturated with CO 2 .
Claim 26
Dependent Claim
16 words
The method of claim 20 wherein said electrolyte system solution is saturated with CO 2 .
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) | 1992-07-31 | 1993-01-30 | 1993-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-31 | 1997-01-30 | 1997-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-31 | 2001-01-30 | 2001-08-01 | $7700.00 | Window Closed / Lapsed |