US4904552A
Expired / Lapsed
US
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Non-aqueous secondary cell
Assignee: Sanyo Electric Co Ltd
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Filing: 1989-07-19
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Granted: 1990-02-27
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Expires: 2009-07-19
Abstract
Abstract A non-aqueous secondary cell is provided which is repeatedly chargeable and dischargeable. This cell comprises, as main components thereof, a negative electrode, a positive electrode, and a separator disposed between the positive electrode and negative electrode and impregnated with an electrolyte. The negative electrode has lithium or a lithium alloy as the active material. The positive electrode has as the active material a manganese oxide expressed by a chemical formula Li 1-X Mn 2 O 4 wherein 1≧X≧0.
Inventors
- 👤 Nobuhiro Furukawa
- 👤 Toshihiko Saito
- 👤 Toshiyuki Nohma
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:22
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/02; H01M4/36; H01M4/48; H01M4/50; H01M4/505; H01M10/00; H01M10/05; H01M10/052; H01M4/13; H01M4/131; H01M4/134; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
64 words
A repeatedly chargeable and dischargeable nonaqueous secondary cell comprising: a negative electrode having lithium or a lithium alloy as an active material, a positive electrode having manganese oxide of the formula Li 1-X Mn 2 O 4 , wherein 1>X>0, as an active material when said cell is prepared, a separator disposed between said positive electrode and said negative electrode, and a non-aqueous electrolyte.
Claim 2
Dependent Claim
64 words
A repeatedly chargeable and dischargeable nonaqueous secondary cell comprising: a negative electrode having lithium or a lithium alloy as an active material, a positive electrode having manganese oxide of the formula Li 1-X Mn 2 O 4 , wherein 1>X>0, as an active material when said cell is prepared, a separator disposed between said positive electrode and said negative electrode, and a non-aqueous electrolyte.
Claim 3
Dependent Claim
29 words
A cell as claimed is claim 1 wherein said manganese oxide is a manganese oxide having a crystal structure intermediate between a spinel type manganese oxide and λ-manganese oxide.
Claim 4
Dependent Claim
36 words
A cell as claimed in claim 2 wherein said manganese oxide having a crystal structure intermediate between a spinel type manganese oxide and λ-manganese oxide is prepared by immersing said spinel type manganese oxide in acid.
Claim 5
Dependent Claim
22 words
A cell as claimed in claim 3 wherein a lithium concentration in the manganese oxide is varied by changing acid treatment conditions.
Claim 6
Dependent Claim
49 words
A cell as claimed in claim 2 wherein said manganese oxide having a crystal structure intermediate between a spinel type manganese oxide and λ-manganese oxide is prepared by immersing λ-MnO 2 or α-MnO 2 in LiOH solution, thereafter applying a microwave thereto until said LiOH solution evaporates, and heat-treating.
Claim 7
Dependent Claim
51 words
A cell as claimed in claim 2 wherein said manganese oxide having a crystal structure intermediate between a spinel type manganese oxide and λ-manganese oxide is prepared by substituting lithium ions for dissimilar cations contained in a crystal structure of δ-MnO 2 or α-MnO 2 and thereafter heat-treating the manganese dioxide.
Claim 8
Dependent Claim
29 words
A cell as claimed in claim 1 wherein said negative electrode is formed of a material selected from the group consisting of pure lithium, lithium-aluminum alloy and lithium-magnesium alloy.
Claim 9
Dependent Claim
16 words
A cell as claimed in claim 1 wherein said separator comprises a porous membrane of polypropylene.
Claim 10
Dependent Claim
28 words
A cell as claimed in claim 1 wherein said electrolyte comprises a liquid mixture formed by dissolving lithium perchlorate in a solvent mixture of propylene carbonate and dimethoxyethane.
Claim 11
Dependent Claim
28 words
A cell as claimed in claim 1 wherein said positive electrode is pressed upon a positive collector secured to a bottom inside surface of a positive terminal can.
Claim 12
Dependent Claim
28 words
A cell as claimed in claim 1 wherein said negative electrode is pressed upon a negative collector secured to a bottom inside surface of a negative terminal can.
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) | 1993-02-26 | 1993-08-28 | 1994-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-26 | 1997-08-28 | 1998-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-02-26 | 2001-08-28 | 2002-02-27 | $7700.00 | Window Closed / Lapsed |