US4379815A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cell having mixed solid cathode materials for controlling cell expansion on discharge
Assignee: Edgewell Personal Care Brands LLC
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Filing: 1981-06-29
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Granted: 1983-04-12
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Expires: 2001-06-29
Abstract
Abstract A galvanic cell employing a consumable anode such as lithium, a cathode that expands during cell discharge and an electrolyte, wherein the improvement is that the cathode is composed of a physical mixture of at least two solid active materials having different expansion characteristics on cell discharge and selected such that the cathode mixture has a volumetric expansion substantially equal to the volumetric contraction of the anode thereby providing a cell that will have a substantially constant physical configuration during discharge.
Inventors
- 👤 Gerald F. Bubnick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 04:11
CPC Classifications
H; H01; H01M; H01M6/00; H01M6/50; H01M4/00; H01M4/02; H01M4/36; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
129 words
A cell comprising a consumable anode, a cathode that expands during cell discharge, and an electrolyte, the improvement wherein the cathode comprises a physical mixture of at least two solid active cathode materials in which a first solid active cathode material volumetrically expands more than the volumetric contraction of the anode during cell discharge and a second solid cathode material that volumetrically expands less than the volumetric expansion of the first solid active cathode material during cell discharge and wherein said solid active cathode materials are selected such that the volumetric expansion of the mixture of the solid active cathode materials is substantially equal to the volumetric contraction of the anode during cell discharge thereby providing a substantially constant volume for the cathode/anode assembly during discharge of the cell.
Claim 2
Dependent Claim
129 words
A cell comprising a consumable anode, a cathode that expands during cell discharge, and an electrolyte, the improvement wherein the cathode comprises a physical mixture of at least two solid active cathode materials in which a first solid active cathode material volumetrically expands more than the volumetric contraction of the anode during cell discharge and a second solid cathode material that volumetrically expands less than the volumetric expansion of the first solid active cathode material during cell discharge and wherein said solid active cathode materials are selected such that the volumetric expansion of the mixture of the solid active cathode materials is substantially equal to the volumetric contraction of the anode during cell discharge thereby providing a substantially constant volume for the cathode/anode assembly during discharge of the cell.
Claim 3
Dependent Claim
23 words
The cell of claim 1 wherein the second active cathode material has a volumetric expansion less than the volumetric contraction of the anode.
Claim 4
Dependent Claim
28 words
The cell of claim 1 wherein the operating voltage of each of the active cathode materials with respect to the anode is within 0.3 volt of each other.
Claim 5
Dependent Claim
49 words
The cell of claim 1, 2 or 3 wherein the first solid active material is FeS 2 and the second solid active material is CuO and wherein the CuO is present in an amount between about 35% and about 75% based on the weight of the active cathode materials.
Claim 6
Dependent Claim
27 words
The cell of claim 4 wherein the CuO is present in an amount between about 45% and 55% based on the weight of the active cathode materials.
Claim 7
Dependent Claim
29 words
The cell of claim 1, 2 or 3 wherein the first solid active material is FeS 2 and the second solid active material is Bi 2 O 3 .
Claim 8
Dependent Claim
27 words
The cell of claim 1, 2 or 3 wherein the first solid active material is FeS 2 and the second solid active material is CoS 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) | 1986-04-11 | 1986-10-11 | 1987-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-04-11 | 1990-10-11 | 1991-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-04-11 | 1994-10-11 | 1995-04-12 | $7700.00 | Window Closed / Lapsed |