US4399202A
Expired / Lapsed
US
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Lithium battery
Assignee: Sanyo Electric Co Ltd
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Filing: 1981-06-08
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Granted: 1983-08-16
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Expires: 2001-06-08
Abstract
Abstract In a lithium battery having a negative electrode formed with lithium as active material and the positive electrode formed with manganese dioxide, carbon fluoride or the like as the active material, the discharge capacity of the negative electrode is made smaller than the discharge capacity of the positive electrode, whereby a drop in the battery voltage during the final discharge stage is steepened, and prevents a device using such a lithium battery as a power supply from operating in an unstable manner, thereby improving the reliability of such device.
Inventors
- 👤 Hironosuke Ikeda
- 👤 Satoshi Narukawa
- 👤 Shigehiro Nakaido
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:01
CPC Classifications
H; H01; H01M; H01M6/00; H01M6/50; H01M6/14; H01M6/16; H01M2006/5094
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
65 words
A battery comprising: a positive electrode consisting essentially of manganese dioxide as an active material; a negative electrode consisting essentially of lithium as an active material, said negative electrode having a much larger electrode potential and a smaller discharge capacity than said positive electrode; and an electrolyte comprising of an organic material which is a solution of a salt of lithium in an organic solvent.
Claim 2
Dependent Claim
65 words
A battery comprising: a positive electrode consisting essentially of manganese dioxide as an active material; a negative electrode consisting essentially of lithium as an active material, said negative electrode having a much larger electrode potential and a smaller discharge capacity than said positive electrode; and an electrolyte comprising of an organic material which is a solution of a salt of lithium in an organic solvent.
Claim 3
Dependent Claim
26 words
The battery of claim 1 further including a separator layer located between the positive and negative electrodes, said separator layer being formed of polypropylene non-woven fabric.
Claim 4
Dependent Claim
20 words
The battery of claim 1 wherein the salt of lithium includes lithium perchlorate and the organic solvent includes propylene carbonate.
Claim 5
Dependent Claim
17 words
The battery of claim 3, wherein said negative electrode has a discharge capacity of about 50 mAH.
Claim 6
Dependent Claim
22 words
The battery of claim 1 wherein the organic solvent is propylene carbonate mixed with 1.2 dimethoxyethane at an equivalent ratio by volume.
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) | 1986-08-15 | 1987-02-14 | 1987-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-15 | 1991-02-14 | 1991-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-15 | 1995-02-14 | 1995-08-16 | $7700.00 | Window Closed / Lapsed |