US4960657A
Expired / Lapsed
US
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Lithium cells
Assignee: Bridgestone Corp
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Filing: 1989-02-21
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Granted: 1990-10-02
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Expires: 2009-02-21
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 water, lithium hydroxide, a PF6 ion-containing compound, or an AsF6 ion-containing compound.
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
2026-10-27 14:44
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: 4
Claim 1
Independent Claim
60 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 by contacting the negative electrode with a moist gas containing water in an amount of 0.3 to 50% by weight.
Claim 2
Dependent Claim
60 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 by contacting the negative electrode with a moist gas containing water in an amount of 0.3 to 50% by weight.
Claim 3
Dependent Claim
45 words
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 covering the negative electrode surface with lithium hydroxide powder or sheet.
Claim 4
Dependent Claim
45 words
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 covering the negative electrode surface with lithium hydroxide powder or sheet.
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) | 1993-10-01 | 1994-04-02 | 1994-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-10-01 | 1998-04-02 | 1998-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-10-01 | 2002-04-02 | 2002-10-02 | $7700.00 | Window Closed / Lapsed |