US4585718A
Expired / Lapsed
US
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Lithium-manganese dioxide cell
Assignee: Sony Corp
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Filing: 1985-02-26
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Granted: 1986-04-29
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Expires: 2005-02-26
Abstract
Abstract A lithium-manganese dioxide cell comprising a cathode composed of manganese dioxide, an anode composed of metal lithium and an electrolyte interposed therebetween. The manganese dioxide having an X-ray diffraction peak in the vicinity of a diffraction crystal lattice distance d=3.60 Å analyzed after discharging in a cell. The manganese dioxide may be prepared by the steps of adding nitric acid to electrolytic manganese (EMD), chemical manganese dioxide (CMD), a product obtained by heat-treatment of EMD or CMD, a product obtained by thermal decomposition of EMD or CMD, or a product by thermal decomposition of manganese nitrate, and heat-treating the resulting mixture.
Inventors
- 👤 Satoru Uedaira
- 👤 Yoriko Sameshima
- 👤 Hidemasa Tamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:12
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/02; H01M4/36; H01M4/48; H01M4/50; H01M4/502; C; C01; C01G; C01G45/00; C01G45/02; C01G45/024; C01G45/026; H01M6/00; H01M6/14; H01M6/16; C01P; C01P2002/00; C01P2002/70; C01P2002/72; C01P2006/00; C01P2006/40; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
49 words
Manganese dioxide having an X-ray diffraction peak at a diffraction angle 2θ of about 31.2° when analyzed after discharging in a lithium-manganese dioxide cell to a potential of 1.4 volts comprising a cathode composed of said manganese dioxide, an anode composed of metal lithium and an electrolyte interposed therebetween.
Claim 2
Dependent Claim
49 words
Manganese dioxide having an X-ray diffraction peak at a diffraction angle 2θ of about 31.2° when analyzed after discharging in a lithium-manganese dioxide cell to a potential of 1.4 volts comprising a cathode composed of said manganese dioxide, an anode composed of metal lithium and an electrolyte interposed therebetween.
Claim 3
Dependent Claim
51 words
A lithium-manganese dioxide cell comprising a cathode composed of manganese dioxide, an anode composed of metal lithium and an electrolyte interposed therebetween, said manganese dioxide having an X-ray diffraction peak at a diffraction angle 2θ of about 31.2° when analyzed after said cell is discharged to a potential of 1.4 volts.
Claim 4
Dependent Claim
51 words
A lithium-manganese dioxide cell comprising a cathode composed of manganese dioxide, an anode composed of metal lithium and an electrolyte interposed therebetween, said manganese dioxide having an X-ray diffraction peak at a diffraction angle 2θ of about 31.2° when analyzed after said cell is discharged to a potential of 1.4 volts.
Claim 5
Dependent Claim
65 words
A lithium-manganese dioxide cell according to claim 2, wherein said manganese dioxide is obtained by a method comprising the steps of: (a) thermally decomposing electrolytic manganese dioxide (EMD) or chemical manganese dioxide (CMD) to prepare dimanganese trioxide; (b) mixing nitric acid and said dimanganese trioxide to prepare a mixture thereof; (c) heat-treating said mixture; and (d) repeating step (b) and step (c) at least twice.
Claim 6
Dependent Claim
23 words
A lithium-manganese dioxide cell according to claim 3, wherein the thermal decomposition temperature is in the range from 500° C. to 800° C.
Claim 7
Dependent Claim
22 words
A lithium-manganese dioxide cell according to claim 3, wherein the heat-treating temperature is in the range from 170° C. to 500° C.
Claim 8
Dependent Claim
51 words
A lithium-manganese dioxide cell according to claim 2, wherein said manganese dioxide is obtained by a method comprising the steps of: (a) heat-treating electrolytic manganese dioxide (EMD) or chemical manganese dioxide (CMD); (b) mixing nitric acid and thus heat-treated EMD or CMD to prepare a mixture thereof; (c) heat-treating said mixture.
Claim 9
Dependent Claim
32 words
A lithium-manganese dioxide cell according to claim 6, wherein the heat-treating temperature of electrolytic manganese dioxide (EMD) or chemical manganese dioxide (CMD) is in the range from 420° C. to 650° C.
Claim 10
Dependent Claim
24 words
A lithium-manganese dioxide cell according to claim 6, wherein the heat-treating temperature of the mixture is in the range from 170° to 500° C.
Claim 11
Dependent Claim
44 words
A lithium-manganese dioxide cell according to claim 2, wherein said manganese dioxide is obtained by a method comprising the steps of: (a) mixing nitric acid and electrolytic manganese dioxide (EMD) or chemical manganese dioxide (CMD) to prepare a mixture thereof; (b) heat-treating said mixture.
Claim 12
Dependent Claim
17 words
A lithium-manganese dioxide cell according to claim 9, wherein the heat-treating temperature is higher than 170° C.
Claim 13
Dependent Claim
59 words
A lithium-manganese dioxide cell according to claim 2, wherein said manganese dioxide is obtained by a method comprising the steps of: (a) thermally decomposing manganese nitrate to prepare a thermally decomposed product; (b) mixing nitric acid and said product to prepare a mixture thereof; (c) thermally decomposing said mixture; (d) repeating step (b) and step (c) at least once.
Claim 14
Dependent Claim
26 words
A lithium-manganese dioxide cell according to claim 11, wherein the thermal decomposition temperature of manganese nitrate is in the range from 170° C. to 500° C.
Claim 15
Dependent Claim
26 words
A lithium-manganese dioxide cell according to claim 11, wherein the thermal decomposition temperature of the mixture is in the range from 170° C. to 500° C.
References Cited (Backward Citations)
US2716078A
Cited
US2739914A
Cited
US4133856A
Cited
US4221853A
Cited
US4312930A
Cited
US4297231A
Cited
US4277360A
Cited
US4405699A
Cited
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1989-04-28 | 1989-10-28 | 1990-04-29 | $2000.00 | Window Closed / Lapsed |
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