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US5015547A
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Lithium secondary cell
Assignee: Panasonic Holdings Corp
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Filing: 1989-07-05
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Granted: 1991-05-14
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Expires: 2009-07-05
Abstract
Abstract A chargeable lithium secondary cell comprising a positive electrode composed mainly of vanadium pentaoxide, a negative electrode of a compound of lithium with niobium pentaoxide and an electrolyte of an organic solvent in which a lithium salt is dissolved, wherein resistance to overdischarge is obtained by a constitution that the molar ratio of the niobium pentaoxide to vanadium pentaoxide is from not less than 0.5 to not more than 1 and the molar ratio of the total litium contained in the positive and negative electrodes to vanadium pentaoxide is from not less than 1.1 to not more than 2.
Inventors
- 👤 Nobuharu Koshiba
- 👤 Shuichi Nishino
- 👤 Kenichi Takata
- 👤 Toshihiko Ikehata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:23
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/02; H01M4/36; H01M4/48; H01M4/485; H01M10/00; H01M10/05; H01M10/052; H01M10/0525; H01M2004/026; H01M2004/027; H01M2004/028; H01M4/13; H01M4/131; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
105 words
A lithium secondary cell having an electrolyte of an organic solvent in which a lithium salt is dissolved, and using a positive electrode of vanadium pentaoxide and a negative electrode of a compound of lithium with niobium pentaoxide in a charging state, wherein the amount of niobium pentaoxide is such that the molar ratio of the niobium pentaoxide to the vanadium pentaoxide is from not less than 0.5 to not more than 1, and the molar ratio of the total amount of lithium contained in the positive and negative electrodes to the vanadium pentaoxide is from not less than 1.1 to not more than 2.
Claim 2
Dependent Claim
105 words
A lithium secondary cell having an electrolyte of an organic solvent in which a lithium salt is dissolved, and using a positive electrode of vanadium pentaoxide and a negative electrode of a compound of lithium with niobium pentaoxide in a charging state, wherein the amount of niobium pentaoxide is such that the molar ratio of the niobium pentaoxide to the vanadium pentaoxide is from not less than 0.5 to not more than 1, and the molar ratio of the total amount of lithium contained in the positive and negative electrodes to the vanadium pentaoxide is from not less than 1.1 to not more than 2.
Claim 3
Dependent Claim
24 words
A lithium secondary cell according to claim 1 wherein the molar ratio of the lithium to the niobium pentaoxide is not more than 2.
Claim 4
Dependent Claim
23 words
A lithium secondary cell according to claim 1 wherein the molar ratio of the lithium to the niobium pentaoxide is more than 2.
References Cited (Backward Citations)
JPS56147368A
Cited
US4464447A
Cited
JPS6259412A
Cited
JPS631708A
Cited
US4751158A
Cited
US4786499A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-05-13 | 1994-11-12 | 1995-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-05-13 | 1998-11-12 | 1999-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-05-13 | 2002-11-12 | 2003-05-14 | $7700.00 | Window Closed / Lapsed |