US4279972A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Non-aqueous electrolyte cell
Assignee: Duracell Inc USA
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Filing: 1979-08-27
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Granted: 1981-07-21
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Expires: 1999-08-27
Abstract
Abstract A non-aqueous electrolyte cell particularly one containing a beta manganese dioxide cathode wherein the cathode is normally rigorously heat treated to drive off contained water. The heat treatment is substantially reduced or eliminated (allowing up to 2% water by weight of the cathode to remain in the cell) by utilizing as an electrolyte salt in the cell, a salt which reacts with water to only form a weak oxidizing agent which in turn does not react with the electrolyte solvent to form a gaseous product. Alternatively, an electrolyte solvent is initially utilized in the cell, which solvent does not react with strong oxidizing agents to form a gaseous product.
Inventors
- 👤 Peter R. Moses
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:20
CPC Classifications
H; H01; H01M; H01M6/00; H01M6/14; H01M6/16; H01M4/00; H01M4/02; H01M4/36; H01M4/48; H01M4/50; H01M4/502; Y; Y02; Y02E; Y02E60/00; Y02E60/10; Y02P; Y02P70/00; Y02P70/50
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
104 words
A stabilized electrochemical cell comprising an anode comprised of a metal above hydrogen in the EMF series, a water retaining metal oxide cathode having water in normally detrimental amounts up to 2% by weight thereof retained therein, a nonaqueous electrolyte solvent and an electrolyte salt dissolved in said solvent characterized in that said solvent and said salt are substantially unreactive with respect to the formation of a gaseous reaction product in the presence of said water and wherein said salt is selected from the group consisting of lithium salts of PF 6 - , CF 3 SO 3 - and BF 4 - .
Claim 2
Dependent Claim
104 words
A stabilized electrochemical cell comprising an anode comprised of a metal above hydrogen in the EMF series, a water retaining metal oxide cathode having water in normally detrimental amounts up to 2% by weight thereof retained therein, a nonaqueous electrolyte solvent and an electrolyte salt dissolved in said solvent characterized in that said solvent and said salt are substantially unreactive with respect to the formation of a gaseous reaction product in the presence of said water and wherein said salt is selected from the group consisting of lithium salts of PF 6 - , CF 3 SO 3 - and BF 4 - .
Claim 3
Dependent Claim
11 words
The cell of claim 1 wherein said cathode comprises manganese dioxide.
Claim 4
Dependent Claim
19 words
The cell of claim 2 wherein said solvent is selected from the group consisting of dioxolane, gamma-butyrolactone and diglyme.
Claim 5
Dependent Claim
13 words
The cell of claim 2 wherein said manganese dioxide comprises beta manganese dioxide.
Claim 6
Dependent Claim
10 words
The cell of claim 4 wherein said anode comprises lithium.
Claim 7
Dependent Claim
75 words
A stable electrochemical cell comprising an anode comprised of lithium, a cathode comprised of manganese dioxide with water in normally detrimental amounts up to 2% by weight thereof retained therein, a non-aqueous electrolyte solvent and an electrolyte salt dissolved in said solvent wherein said salt consists of LiPF 6 and wherein said LiPF 6 salt and said solvent are substantially unreactive in the formation of a gaseous reaction product in the presence of said water.
Claim 8
Dependent Claim
75 words
A stable electrochemical cell comprising an anode comprised of lithium, a cathode comprised of manganese dioxide with water in normally detrimental amounts up to 2% by weight thereof retained therein, a non-aqueous electrolyte solvent and an electrolyte salt dissolved in said solvent wherein said salt consists of LiPF 6 and wherein said LiPF 6 salt and said solvent are substantially unreactive in the formation of a gaseous reaction product in the presence of said water.
Claim 9
Dependent Claim
13 words
The cell of claim 6 wherein said manganese dioxide comprises beta manganese dioxide.
Claim 10
Dependent Claim
11 words
The cell of claim 6 wherein said solvent comprises propylene carbonate.
Claim 11
Independent Claim
100 words
A method for preventing detrimental gas evolution in a non-aqueous electrochemical cell having an anode above hydrogen in the EMF series, a cathode with water in normally detrimental amounts up to 2% by weight thereof retained therein and as electrolyte a solution of an electrolyte salt dissolved in a non-aqueous solvent, comprising using, as non-aqueous solvent and electrolyte salt selected from the group consisting of lithium salts of PF 6 - , CF 3 SO 3 - , and BF 4 - dissolved therein, materials which are, in the presence of water, substantially unreactive to form a gaseous reaction product.
Claim 12
Independent Claim
100 words
A method for preventing detrimental gas evolution in a non-aqueous electrochemical cell having an anode above hydrogen in the EMF series, a cathode with water in normally detrimental amounts up to 2% by weight thereof retained therein and as electrolyte a solution of an electrolyte salt dissolved in a non-aqueous solvent, comprising using, as non-aqueous solvent and electrolyte salt selected from the group consisting of lithium salts of PF 6 - , CF 3 SO 3 - , and BF 4 - dissolved therein, materials which are, in the presence of water, substantially unreactive to form a gaseous reaction product.
Claim 13
Dependent Claim
20 words
The method of claim 9 wherein said electrolyte salt forms a weak oxidizing agent when in the presence of water.
Claim 14
Dependent Claim
20 words
The method of claim 9 wherein said solvent is unreactive with strong oxidizing agents to form a gaseous reaction product.
Claim 15
Dependent Claim
12 words
The method of claim 9 wherein said cathode comprises MnO 2 .
Claim 16
Dependent Claim
14 words
The method of claim 12 wherein said MnO 2 comprises beta MnO 2 .
Claim 17
Dependent Claim
10 words
The method of claim 13 wherein said anode comprises lithium.
Claim 18
Dependent Claim
12 words
The method of claim 1 wherein said salt comprises LiPF 6 .
Claim 19
Dependent Claim
91 words
A stabilized electrochemical cell comprising an anode comprised of a metal above hydrogen in the EMF series, a water retaining metal oxide cathode having water in normally detrimental amounts up to 2% by weight thereof retained therein, a non-aqueous electrolyte solvent and an electrolyte salt dissolved in said solvent characterized in that said solvent and said salt are substantially unreactive with respect to the formation of a gaseous reaction product in the presence of said water and wherein said solvent is selected from the group consisting of dioxolane, gamma-butyrolactone and diglyme.
Claim 20
Dependent Claim
91 words
A stabilized electrochemical cell comprising an anode comprised of a metal above hydrogen in the EMF series, a water retaining metal oxide cathode having water in normally detrimental amounts up to 2% by weight thereof retained therein, a non-aqueous electrolyte solvent and an electrolyte salt dissolved in said solvent characterized in that said solvent and said salt are substantially unreactive with respect to the formation of a gaseous reaction product in the presence of said water and wherein said solvent is selected from the group consisting of dioxolane, gamma-butyrolactone and diglyme.
Claim 21
Dependent Claim
39 words
The cell of claim 1 or 16 wherein said metal oxide is selected from the group consisting of TiO 2 , SnO, MoO 3 , V 2 O 5 , PbO, Fe 2 O 3 and MnO 2 .
Claim 22
Dependent Claim
13 words
The cell of claim 16 wherein said electrolyte salt comprises LiClO 4 .
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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) | 1984-07-20 | 1985-01-19 | 1985-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-07-20 | 1989-01-19 | 1989-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-07-20 | 1993-01-19 | 1993-07-21 | $7700.00 | Window Closed / Lapsed |