US4758484A
Expired / Lapsed
US
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Non-aqueous secondary cell
Assignee: Sanyo Electric Co Ltd
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Filing: 1987-10-29
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Granted: 1988-07-19
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Expires: 2007-10-29
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 negative and positive electrode and impregnated with an electrolyte. The negative electrode has lithium or lithium alloy as the active material. The positive electrode has manganese dioxide as the active material and contains Li 2 MnO 3 .
Inventors
- 👤 Nobuhiro Furukawa
- 👤 Toshihiko Saito
- 👤 Toshiyuki Nohma
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:41
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/02; H01M4/36; H01M10/00; H01M10/05; H01M10/052; H01M4/13; H01M4/131; H01M4/134; H01M4/139; H01M4/1391; H01M4/48; H01M4/485; H01M4/50; H01M4/505; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
55 words
A repeatedly chargeable and dischargeable non-aqueous secondary cell comprising; a negative electrode having lithium or lithium alloy as an active material, a positive electrode having manganese dioxide as an active material, said positive electrode including Li 2 MnO 3 , a separator disposed between said positive electrode and said negative electrode, and a non-aqueous electrolyte.
Claim 2
Dependent Claim
55 words
A repeatedly chargeable and dischargeable non-aqueous secondary cell comprising; a negative electrode having lithium or lithium alloy as an active material, a positive electrode having manganese dioxide as an active material, said positive electrode including Li 2 MnO 3 , a separator disposed between said positive electrode and said negative electrode, and a non-aqueous electrolyte.
Claim 3
Dependent Claim
25 words
A cell as claimed in claim 1 wherein said Li 2 MnO 3 is obtained by heat-treating a mixture of manganese dioxide and lithium salt.
Claim 4
Dependent Claim
29 words
A cell as claimed in claim 2 wherein said lithium salt is selected from the group consisting of lithium hydroxide, lithium nitrate, lithium phosphate, lithium carbonate and lithium oxide.
Claim 5
Dependent Claim
26 words
A cell as claimed in claim 2 wherein said lithium salt and manganese dioxide are mixed in a lithium-manganese molar ratio range of 10:90 to 70:30.
Claim 6
Dependent Claim
28 words
A cell as claimed in claim 2 wherein said mixture of manganese dioxide and lithium salt is heat-treated in a temperature range of 300°-430° C., preferably 350°-430° C.
Claim 7
Dependent Claim
48 words
A cell as claimed in claim 1 wherein said positive electrode is formed by heat-treating a mixture of manganese dioxide and lithium salt to produce manganese dioxide and Li 2 MnO 3 , thereafter adding a conductive agent and a binder, and pressurizing and heat-treating a resulting mixture.
Claim 8
Dependent Claim
51 words
A cell as claimed in claim 1 wherein said positive electrode is formed by heat-treating a mixture of manganese dioxide and lithium salt to produce manganese dioxide and Li 2 MnO 3 , thereafter adding further manganese dioxide, a conductive agent and a binder, and pressurizing and heat-treating a resulting mixture.
Claim 9
Dependent Claim
47 words
A cell as claimed in claim 1 wherein said positive electrode is formed by heat-treating a mixture of manganese dioxide and lithium salt to produce Li 2 MnO 3 , thereafter adding manganese dioxide, a conductive agent and a binder, and pressurizing and heat-treating a resulting mixture.
Claim 10
Dependent Claim
25 words
A cell as claimed in claim 1 wherein said negative electrode is selected from the group consisting of pure lithium, lithium-aluminum alloy and lithium-magnesium alloy.
Claim 11
Dependent Claim
16 words
A cell as claimed in claim 1 wherein said separator comprises a porous membrane of polypropylene.
Claim 12
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 13
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 14
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.
Claim 15
Dependent Claim
56 words
A repeatedly chargeable and dischargeable non-aqueous secondary cell comprising; a negative electrode having lithium or lithium alloy as an active material, a positive electrode having a mixture in which manganese dioxide as an active material and Li 2 MnO 3 coexist, a separator disposed between said positive electrode and said negative electrode, and a non-aqueous electrolyte.
Claim 16
Dependent Claim
56 words
A repeatedly chargeable and dischargeable non-aqueous secondary cell comprising; a negative electrode having lithium or lithium alloy as an active material, a positive electrode having a mixture in which manganese dioxide as an active material and Li 2 MnO 3 coexist, a separator disposed between said positive electrode and said negative electrode, and a non-aqueous electrolyte.
Claim 17
Dependent Claim
48 words
A cell as claimed in claim 14 wherein said positive electrode is formed by heat-treating a mixture of manganese dioxide and lithium salt to produce manganese dioxide and Li 2 MnO 3 , thereafter adding a conductive agent and a binder, and pressurizing and heat-treating a resulting mixture.
Claim 18
Dependent Claim
47 words
A cell as claimed in claim 14 wherein said positive electrode is formed by heat-treating a mixture of manganese dioxide and lithium salt to produce Li 2 MnO 3 , thereafter adding manganese dioxide, a conductive agent and a binder, and pressurizing and heat-treating a resulting mixture.
Claim 19
Dependent Claim
25 words
A cell as claimed in claim 14 wherein said negative electrode is selected from the group consisting of pure lithium, lithium-aluminum alloy and lithium-magnesium alloy.
Claim 20
Dependent Claim
16 words
A cell as claimed in claim 14 wherein said separator comprises a porous membrane of polypropylene.
Claim 21
Dependent Claim
28 words
A cell as claimed in claim 14 wherein said electrolyte comprises a liquid mixture formed by dissolving lithium perchlorate in a solvent mixture of propylene carbonate and dimethoxyethane.
References Cited (Backward Citations)
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1991-07-19 | 1992-01-18 | 1992-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-07-19 | 1996-01-18 | 1996-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-07-19 | 2000-01-18 | 2000-07-19 | $7700.00 | Window Closed / Lapsed |