US4101719A
Expired / Lapsed
US
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Silver(II) oxide cell and its manufacture
Assignee: Maxell Ltd
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Filing: 1977-07-18
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Granted: 1978-07-18
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Expires: 1997-07-18
Abstract
Abstract A silver(II) oxide cell which comprises a positive electrode comprising a shaped body of silver(II) oxide as a positive active material, a negative electrode comprising zinc as a negative active material and an alkaline electrolyte, characterized in that the shaped body is a molding product of a composition comprising particles of which each particle comprises a core part of silver(II) oxide and a surface part of silver(I) oxide integrally and continuously provided around the core part, the weight ratio of the silver(II) oxide and the silver(I) oxide being from about 70 : 30 to 90 : 10. Such silver(II) oxide cell has large discharge capacity and shows a flat and even discharge characteristics without any substantial deterioration in performances on storage.
Inventors
- 👤 Yoshio Uetani
- 👤 Akio Shimizu
- 👤 Kozo Kajita
- 👤 Hiroshi Ishiuchi
- 👤 Tadashi Goryo
- 👤 Kazuo Ishida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 11:34
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/02; H01M4/06; H01M4/36; H01M4/48; H01M4/54; H01M6/00; H01M6/04; H01M6/06; H01M6/12
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
74 words
A silver(II) oxide cell which comprises a positive electrode comprising a shaped body of silver(II) oxide as a positive active material, a negative electrode comprising a negative active material and an alkaline electrolyte, characterized in that the shaped body is a molding product of a composition comprising particles of which each particle comprises a core part of silver(II) oxide and a surface part of silver(I) oxide integrally and continuously provided around the core part.
Claim 2
Dependent Claim
74 words
A silver(II) oxide cell which comprises a positive electrode comprising a shaped body of silver(II) oxide as a positive active material, a negative electrode comprising a negative active material and an alkaline electrolyte, characterized in that the shaped body is a molding product of a composition comprising particles of which each particle comprises a core part of silver(II) oxide and a surface part of silver(I) oxide integrally and continuously provided around the core part.
Claim 3
Dependent Claim
31 words
The silver(II) oxide cell according to claim 1, wherein the weight ratio of the silver (II) oxide and the silver(I) oxide is from about 70 : 30 to 90 : 10.
Claim 4
Dependent Claim
14 words
The silver(II) oxide cell according to claim 1, wherein the particle additionally comprises gold.
Claim 5
Dependent Claim
27 words
The silver(II) oxide cell according to claim 3, wherein the gold content is not more than about 1% by weight based on the weight of the particle.
Claim 6
Dependent Claim
35 words
The silver(II) oxide cell according to claim 1, wherein the particles comprise those of from about 1 μ to 10 μ in particle size in a content of not less than about 90% by weight.
Claim 7
Dependent Claim
22 words
The silver(II) oxide cell according to claim 5, wherein the particles have an average particle size of about 1.5 to 2.5 μ.
Claim 8
Dependent Claim
73 words
The silver(II) oxide cell according to claim 1, wherein the particles are those prepared by oxidizing a silver salt with a persulfate in an aqueous solution of alkali, the amounts of the persulfate and of the alkali being respectively from about 0.7 to 2.0 mol and from about 2.4 to 5.0 mol to 1 mol of the silver salt, and converting the resultant silver(II) oxide particles at the surface parts into silver(I) oxide.
Claim 9
Dependent Claim
21 words
The silver(II) oxide cell according to claim 7, wherein the conversion is achieved by thermal decomposition at 60° to 150° C.
Claim 10
Dependent Claim
23 words
The silver(II) oxide cell according to claim 7, wherein the conversion is achieved by reduction with glycerol or glycose in an alkaline solution.
Claim 11
Dependent Claim
36 words
The silver(II) oxide cell according to claim 1, wherein the molded product is one prepared by immersing the particles in boiling water and, after they are removed from the water, the resulting particles are compression molded.
Claim 12
Dependent Claim
35 words
The silver(II) oxide cell according to claim 1, wherein molded product is the one prepared by compression molding the particles, immersing the shaped body in boiling water and removing the treated body from the water.
Claim 13
Dependent Claim
48 words
The silver(II) oxide cell according to claim 1, wherein the molded product is one prepared by immersing the particles in an aqueous solution of an alkali metal hydroxide or an alkaline earth metal hydroxide and, after they are removed from the solution, the resulting particles are compression molded.
Claim 14
Dependent Claim
47 words
The silver(II) oxide cell according to claim 1, wherein the molded product is one prepared by compression molding the particles, immersing the shaped body in an aqueous solution of an alkali metal hydroxide or an alkaline earth metal hydroxide and removing the treated body from the solution.
Claim 15
Dependent Claim
22 words
The silver(II) oxide cell according to claim 1, wherein the molded product is one prepared by compression molding of the particles alone.
Claim 16
Dependent Claim
28 words
The silver(II) oxide cell according to claim 1, wherein the molded product is one prepared by compression molding of the particles in admixture with a non-carbonaceous electroconductive material.
Claim 17
Dependent Claim
30 words
The silver(II) oxide cell according to claim 1, wherein the molded product is one prepared by compression molding of the particles in admixture with an anti-oxidative and alkali-resistant, water-repelling material.
Claim 18
Dependent Claim
15 words
The silver(II) oxide cell according to claim 16, wherein the water-repellent is a fluorine-containing material.
Claim 19
Dependent Claim
33 words
The silver(II) oxide cell according to claim 1, wherein the molded product is provided with a metallic silver layer thereon at least at the parts which are contacted to a positive terminal material.
Claim 20
Dependent Claim
26 words
The silver(II) oxide cell according to claim 18, wherein the metallic silver layer is formed in an amount of about 20 to 70 mg/cm 2 .
Claim 21
Dependent Claim
25 words
The silver(II) oxide cell according to claim 1, wherein the molded product has a packing density of from about 5 to 7 g/cm 3 .
Claim 22
Dependent Claim
35 words
The silver(II) oxide cell according to claim 1, wherein the molded product is wetted with an alkaline solution containing an alkali in a concentration of from about 5 to 27% by weight, as the electrolyte.
Claim 23
Dependent Claim
60 words
A positive electrode element for a silver(II) oxide cell which comprises a molded product prepared by compression molding particles to shape in a plate having a packing density of from about 5 to 7 g/cm 3 , each of said particles comprising a core part of silver(II) oxide and a surface part of silver(I) oxide integrally and continuously provided thereon.
Claim 24
Dependent Claim
60 words
A positive electrode element for a silver(II) oxide cell which comprises a molded product prepared by compression molding particles to shape in a plate having a packing density of from about 5 to 7 g/cm 3 , each of said particles comprising a core part of silver(II) oxide and a surface part of silver(I) oxide integrally and continuously provided thereon.
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) | 1981-07-17 | 1982-01-16 | 1982-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-17 | 1986-01-16 | 1986-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-17 | 1990-01-16 | 1990-07-18 | $7700.00 | Window Closed / Lapsed |