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Patent US5057387A successfully refreshed from Google Patents.
US5057387A
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Lithium cells
Assignee: Bridgestone Corp
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Filing: 1990-05-16
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Granted: 1991-10-15
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Expires: 2010-05-16
Abstract
Abstract A lithium cell comprising a negative electrode containing lithium, a positive electrode, and an electrolyte disposed between the positive and negative electrodes is improved in internal resistance and shelf life when the negative electrode is surface treated with a composition containing from more than 1% to 5% by weight of water.
Inventors
- 👤 Yoshitomo Masuda
- 👤 Masao Ogawa
- 👤 Katsuhiko Arai
- 👤 Kinya Suzuki
- 👤 Tadashi Fuse
- 👤 Tetsuro Amano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:49
CPC Classifications
H; H01; H01M; H01M10/00; H01M10/05; H01M10/36; H01M4/00; H01M4/02; H01M4/13; H01M4/36; H01M4/38; H01M4/40; H01M4/60; H01M6/00; H01M6/14; H01M6/16; H01M2004/026; H01M2004/027; H01M2300/00; H01M2300/0017; H01M2300/0025; H01M2300/0065; H01M2300/0068; H01M2300/0082; H01M4/04; H01M4/043; H01M4/049; H01M4/0495; H01M4/405; H01M4/58; H01M4/583; H01M4/587; H01M50/00; H01M50/40; H01M50/46; Y; Y02; Y02E; Y02E60/00; Y02E60/10; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49108; Y10T29/49115
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
59 words
In a lithium cell comprising a negative electrode containing lithium, a positive electrode, and an electrolyte disposed between the positive and negative electrodes, the improvement wherein said negative electrode has a coating thereon obtained by surface treating the negative electrode with a composition containing water in an amount of from more than 1% by weight to 50% by weight.
Claim 2
Dependent Claim
59 words
In a lithium cell comprising a negative electrode containing lithium, a positive electrode, and an electrolyte disposed between the positive and negative electrodes, the improvement wherein said negative electrode has a coating thereon obtained by surface treating the negative electrode with a composition containing water in an amount of from more than 1% by weight to 50% by weight.
Claim 3
Dependent Claim
39 words
The lithium cell of claim 1 wherein said negative electrode is surface treated by contacting it with a liquid containing from more than 1% by weight to 50% by weight of water and the balance of an organic solvent.
Claim 4
Dependent Claim
21 words
The lithium cell of claim 2 wherein said liquid further contains PF 6 ions, AsF 6 ions or a mixture thereof.
Claim 5
Dependent Claim
29 words
The lithium cell of claim 3 wherein the AsF 6 ion-containing compound is selected from the group consisting of NaAsF 6 , KAsF 6 , and LiAsF 6 .
Claim 6
Dependent Claim
29 words
The lithium cell of claim 3 wherein the PF 6 ion-containing compound is selected from the group consisting of NaPF 6 , KPF 6 , and LiPF 6 .
Claim 7
Dependent Claim
67 words
The lithium cell of claim 1 wherein the positive electrode containing water, the lithium-containing negative electrode, and the electrolyte are disposed in a cell container whereby the negative electrode is treated in situ with the water contained in the positive electrode in an amount of from more than 10,000 parts to 50,000 parts per million parts (from more than 1% to 5% by weight) of the electrode.
Claim 8
Dependent Claim
68 words
The lithium cell of claim 6 wherein the positive electrode has an initial water content of from more than 10,000 parts to 50,000 parts by weight per million parts (from more than 1% to 5% by weight) of the electrode and the water content in the positive electrode is finally reduced to at most 1/3 of the initial content due to consumption by reaction with the negative electrode.
Claim 9
Dependent Claim
14 words
The lithium cell of claim 7 wherein the positive electrode comprises an electroconductive polymer.
Claim 10
Dependent Claim
17 words
The lithium cell of claim 8 wherein the electroconductive. polymer is selected from polyaniline and derivatives thereof.
Claim 11
Independent Claim
54 words
A method of preparing a lithium cell comprising a negative electrode containing lithium, a positive electrode, and an electrolyte disposed between the positive and negative electrodes, said method comprising providing the negative electrode surface treated with a member containing water in an amount of from more than 1% by weight to 50% by weight.
Claim 12
Independent Claim
54 words
A method of preparing a lithium cell comprising a negative electrode containing lithium, a positive electrode, and an electrolyte disposed between the positive and negative electrodes, said method comprising providing the negative electrode surface treated with a member containing water in an amount of from more than 1% by weight to 50% by weight.
Claim 13
Dependent Claim
69 words
The method of claim 10 wherein the positive electrode contains water, the positive electrode, the lithium-containing negative electrode, and the electrolyte are disposed in a cell container whereby the negative electrode is treated in situ with the water contained in the positive electrode in an amount of from more than 10,000 parts to 50,000 parts per million parts (from more than 1% to 5% by weight) of the electrode.
Claim 14
Dependent Claim
67 words
The method of claim 11 wherein the positive electrode has an initial water content of from more than 10,000 parts to 50,000 parts by weight per million parts (from more than 1% to 5% by weight) of the electrode and the water content in the positive electrode is finally reduced to at most 1/3 of the initial content due to consumption by reaction with the negative electrode.
Claim 15
Dependent Claim
21 words
The lithium cell of claim 1, wherein the positive electrode is selected from the group consisting of polyaniline and derivatives thereof.
Claim 16
Dependent Claim
19 words
The method of claim 10, wherein the positive electrode is selected from group consisting of polyaniline and derivatives thereof.
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) | 1994-10-14 | 1995-04-15 | 1995-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-10-14 | 1999-04-15 | 1999-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-10-14 | 2003-04-15 | 2003-10-15 | $7700.00 | Window Closed / Lapsed |