US5294499A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Non-aqueous secondary cell
Assignee: Sanyo Electric Co Ltd
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Filing: 1992-10-13
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Granted: 1994-03-15
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Expires: 2012-10-13
Abstract
Abstract A rechargeable non-aqueous secondary cell comprising a negative electrode; a positive electrode comprising a lithium containing manganese oxide as its active material, wherein the positive electrode has a specific surface area measured by the BET method of 9.0 m 2 /g to 67.5 m 2 /g; and a separator interposed between the positive and the negative electrodes which is impregnated with a non-aqueous electrolyte. A recharageable non-aqueous secondary cell comprising a negative electrode; a positive electrode comprising a lithium containing manganese oxide as its active material, which has grain sizes of substantially 20 μm or less, when observed by a scanning electron microscope; and a separator interposed between the positive and said negative electrodes impregnated with a non-aqueous electrolyte.
Inventors
- 👤 Nobuhiro Furukawa
- 👤 Toshiyuki Nohma
- 👤 Yuji Yamamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:50
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/02; H01M4/13; H01M4/131; H01M10/00; H01M10/05; H01M10/052; H01M4/36; H01M4/48; H01M4/485; H01M4/50; H01M4/505; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
62 words
A rechargeable non-aqueous secondary cell comprising: a negative electrode; a positive electrode comprising a lithium containing manganese oxide as its active material, said positive electrode having a specific surface area measured by the BET method of 9.0 m 2 /g to 41.6 m 2 /g; and a separator interposed between said positive and said negative electrodes and impregnated with a non-aqueous electrolyte.
Claim 2
Dependent Claim
62 words
A rechargeable non-aqueous secondary cell comprising: a negative electrode; a positive electrode comprising a lithium containing manganese oxide as its active material, said positive electrode having a specific surface area measured by the BET method of 9.0 m 2 /g to 41.6 m 2 /g; and a separator interposed between said positive and said negative electrodes and impregnated with a non-aqueous electrolyte.
Claim 3
Dependent Claim
43 words
A rechargeable non-aqueous secondary cell of claim 1, wherein said positive electrode is obtained by mixing manganese dioxide and lithium hydroxide, and wherein the specific surface area of said positive electrode is a function of the specific surface area of said manganese dioxide.
Claim 4
Dependent Claim
48 words
A rechargeable non-aqueous secondary cell of claim 1, wherein said positive electrode is obtained from a mixture of manganese dioxide and lithium hydroxide, and wherein the specific surface area of said positive electrode is a function of the mixing ratio of said manganese dioxide and said lithium hydroxide.
Claim 5
Dependent Claim
51 words
A rechargeable non-aqueous secondary cell of claim 1, wherein said positive electrode is obtained from a mixture of manganese dioxide and lithium hydroxide, and wherein the specific surface area of said positive electrode is a function of the temperature of heat-treating said mixture of said manganese dioxide and said lithium hydroxide.
Claim 6
Dependent Claim
20 words
A rechargeable non-aqueous secondary cell of claim 1, wherein said negative electrode comprises either of lithium and a lithium alloy.
Claim 7
Dependent Claim
25 words
A rechargeable non-aqueous secondary cell of claim 1, wherein said electrolyte comprises a mixture of propylene carbonate and dimethoxyethane containing 1 mol/l of lithium perchlorate.
Claim 8
Dependent Claim
28 words
A rechargeable non-aqueous secondary cell of claim 1, wherein said positive electrode has grain sizes of substantially 20 μm or less, when observed by a scanning electron microscope.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-03-14 | 1997-09-13 | 1998-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-03-14 | 2001-09-13 | 2002-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-03-14 | 2005-09-13 | 2006-03-15 | $7700.00 | Window Closed / Lapsed |