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US4465747A
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Alkali metal or alkaline earth metal compound additive for manganese dioxide-containing nonaqueous cells
Assignee: Edgewell Personal Care Brands LLC
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Filing: 1983-06-29
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Granted: 1984-08-14
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Expires: 2003-06-29
Abstract
Abstract A nonaqueous cell employing a manganese dioxide-containing solid cathode having a minor amount of an alkali metal or an alkaline earth metal additive such as Li 2 SiO 3 , Li 2 B 4 O 7 , Li 2 MoO 4 , Li 3 PO 4 or Li 2 WO 4 to suppress the build-up of internal impedance in the cell during storage and discharge that may occur with electrolyte degradation.
Inventors
- 👤 William P. Evans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:36
CPC Classifications
H; H01; H01M; H01M6/00; H01M6/14; H01M6/16; H01M4/00; H01M4/02; H01M4/36; H01M4/48; H01M4/50; H01M4/502
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
110 words
A nonaqueous cell comprising an active metal anode, a nonaqueous electrolyte solution comprising a solute at least one organic solvent, dissolved in a solid cathode comprising manganese dioxide, a binder and a conductive agent; the improvement wherein the cathode contains a minor amount of an additive selected from the group consisting of the borates, silicates, molybdates, phosphates, aluminates, niobates, tantalates, titanates, vanadates, zirconates, manganates (Mn +4), cobaltates, and tungstates of alkali metals or alkaline earth metals wherein the alkali metal is selected from the group consisting of lithium, potassium, rubidium and cesium and wherein the alkaline earth metal is selected from the group consisting of magnesium, calcium, strontium, and barium.
Claim 2
Dependent Claim
110 words
A nonaqueous cell comprising an active metal anode, a nonaqueous electrolyte solution comprising a solute at least one organic solvent, dissolved in a solid cathode comprising manganese dioxide, a binder and a conductive agent; the improvement wherein the cathode contains a minor amount of an additive selected from the group consisting of the borates, silicates, molybdates, phosphates, aluminates, niobates, tantalates, titanates, vanadates, zirconates, manganates (Mn +4), cobaltates, and tungstates of alkali metals or alkaline earth metals wherein the alkali metal is selected from the group consisting of lithium, potassium, rubidium and cesium and wherein the alkaline earth metal is selected from the group consisting of magnesium, calcium, strontium, and barium.
Claim 3
Dependent Claim
35 words
The nonaqueous cell of claim 1 wherein the additive in the cathode is present in an amount between about 0.05 weight percent and about 10 weight percent based on the dry weight of the cathode.
Claim 4
Dependent Claim
32 words
The nonaqueous cell of claim 2 wherein the additive is present in an amount between about 0.1 weight percent and about 5 weight percent based on the dry weight of the cathode.
Claim 5
Dependent Claim
27 words
The nonaqueous cell of claim 2 wherein the additive is selected from the group consisting of lithium metasilicate, lithium tetraborate, lithium molybdate, lithium orthophosphate, and lithium tungstate.
Claim 6
Dependent Claim
12 words
The nonaqueous cell of claim 4 wherein the additive is lithium metasilicate.
Claim 7
Dependent Claim
12 words
The nonaqueous cell of claim 4 wherein the additive is lithium tungstate.
Claim 8
Dependent Claim
14 words
The nonaqueous cell of claim 4 wherein the conductive agent is a carbonaceous material.
Claim 9
Dependent Claim
16 words
The nonaqueous cell of claim 4 wherein the binder is polytetrafluoroethylene or ethylene acrylic acid copolymer.
Claim 10
Dependent Claim
27 words
The nonaqueous cell of claim 4 wherein said active metal anode is selected from the group consisting of lithium, sodium, potassium, magnesium, calcium, aluminum and alloys thereof.
Claim 11
Dependent Claim
13 words
The nonaqueous cell of claim 4 wherein said active metal anode is lithium.
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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) | 1987-08-14 | 1988-02-13 | 1988-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-08-14 | 1992-02-13 | 1992-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-08-14 | 1996-02-13 | 1996-08-14 | $7700.00 | Window Closed / Lapsed |