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US4956248A
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Non-aqueous secondary cell
Assignee: Sanyo Electric Co Ltd
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Filing: 1989-08-16
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Granted: 1990-09-11
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Expires: 2009-08-16
Abstract
Abstract A non-aqueous secondary cell having a compound of manganese oxide, lithium salt and metal oxide as an active material of a positive electrode is disclosed. A negative electrode comprises lithium or lithium alloy. The above positive electrode improves the charge/discharge cycle characteristic and charge/discharge reversibility of the cell and can be produced at a low cost.
Inventors
- 👤 Nobuhiro Furukawa
- 👤 Toshiyuki Nohma
- 👤 Yuji Yamamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:03
CPC Classifications
H; H01; H01M; H01M10/00; H01M10/05; H01M10/052; H01M4/00; H01M4/02; H01M4/13; H01M4/131; H01M4/134; 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
56 words
A non-aqueous secondary cell comprising a positive electrode, a negative electrode and a separator; characterized in that an active material of the negative electrode is one of lithium and lithium alloy and that an active material of the positive electrode is a compound obtained by heat-treating a mixture of manganese oxide, lithium salt and metal oxide.
Claim 2
Dependent Claim
56 words
A non-aqueous secondary cell comprising a positive electrode, a negative electrode and a separator; characterized in that an active material of the negative electrode is one of lithium and lithium alloy and that an active material of the positive electrode is a compound obtained by heat-treating a mixture of manganese oxide, lithium salt and metal oxide.
Claim 3
Dependent Claim
31 words
A non-aqueous secondary cell of claim 1, wherein a metal composing said metal oxide is selected from the group consisting of Mo, Nb, W, Ru, Co, Ti, Bi, Cu and Cr.
Claim 4
Dependent Claim
44 words
A non-aqueous secondary cell of claim 1, wherein the active material of the positive electrode is spinel LiMn 2 O 4 obtained by adding chromium oxide to a mixture of manganese dioxide and lithium salt and heat-treating the mixture added with the chromium oxide.
Claim 5
Dependent Claim
46 words
A non-aqueous secondary cell comprising a positive electrode and a negative electrode; characterized in that an active material of the positive electrode is spinel LiMn 2 O 4 including Cr and that an active material of the negative electrode is one of lithium and lithium alloy.
Claim 6
Dependent Claim
46 words
A non-aqueous secondary cell comprising a positive electrode and a negative electrode; characterized in that an active material of the positive electrode is spinel LiMn 2 O 4 including Cr and that an active material of the negative electrode is one of lithium and lithium alloy.
Claim 7
Independent Claim
48 words
A method of producing an active material of a positive electrode for a non-aqueous secondary cell, comprising steps of adding chromium oxide to a mixture of manganese dioxide and lithium salt and heat-treating the mixture added with the chromium oxide to obtain spinel LiMn 2 O 4 .
Claim 8
Independent Claim
48 words
A method of producing an active material of a positive electrode for a non-aqueous secondary cell, comprising steps of adding chromium oxide to a mixture of manganese dioxide and lithium salt and heat-treating the mixture added with the chromium oxide to obtain spinel LiMn 2 O 4 .
References Cited (Backward Citations)
JPS5657260A
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US4507371A
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US4828834A
Cited
JPS63114064A
Cited
US4758484A
Cited
US4820599A
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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) | 1993-09-10 | 1994-03-12 | 1994-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-09-10 | 1998-03-12 | 1998-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-09-10 | 2002-03-12 | 2002-09-11 | $7700.00 | Window Closed / Lapsed |