US5569561A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Primary or secondary electrochemical generator having a nanoparticulate electrode
Assignee: Renata AG
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Filing: 1995-01-20
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Granted: 1996-10-29
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Expires: 2015-01-20
Abstract
Abstract A high capacity primary or secondary electrochemical generator in which at least one electrode (4,5) is composed of nanocrystalline particles of an electrically active material, said particles being electrically connected together, either by sintering a colloidal film of said electrically active material, or by compressing a mixture containing said nanocrystalline particles in pulverised form.
Inventors
- 👤 Ivan Exnar
- 👤 Michael Graetzel
- 👤 Jean-Paul Randin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:29
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/02; H01M4/36; H01M4/48; H01M4/483; H01M10/00; H01M10/05; H01M10/052; H01M10/056; H01M10/0564; H01M10/0566; H01M10/0569; H01M4/13; H01M4/131; H01M4/485; H01M4/50; H01M4/505; H01M4/52; H01M4/525; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
109 words
A high capacity primary or secondary electrochemical generator having two electrodes supporting different electroactivated materials, said electrodes being connected together by an electrolyte, characterised in that the electroactive material used in the composition of at least one electrode includes an oxide of transition metals or their lithiated or partially lithiated forms selected from TiO 2 , Nb 2 O 5 , HfO 2 , MnO 2 , Li y NiO 2 , Li y CoO 2 , Li y (NiCo)O 2 , or Li y Mn 2 O 4 in the form of nanocrystalline particles having a size between 1 and 250 nm, said particles being electrically connected together.
Claim 2
Dependent Claim
109 words
A high capacity primary or secondary electrochemical generator having two electrodes supporting different electroactivated materials, said electrodes being connected together by an electrolyte, characterised in that the electroactive material used in the composition of at least one electrode includes an oxide of transition metals or their lithiated or partially lithiated forms selected from TiO 2 , Nb 2 O 5 , HfO 2 , MnO 2 , Li y NiO 2 , Li y CoO 2 , Li y (NiCo)O 2 , or Li y Mn 2 O 4 in the form of nanocrystalline particles having a size between 1 and 250 nm, said particles being electrically connected together.
Claim 3
Dependent Claim
69 words
An electrochemical generator according to claim 1, characterised in that the nanocrystalline particles of the electrically active material are electrically connected together by compressing in the form of pellets a mixture composed of said particles obtained in pulverized form from a colloidal solution of the said electrically active material, of carbon powder and of a bonding material, then drying said pellets deposited on a conducting support in a vacuum.
Claim 4
Dependent Claim
21 words
An electrochemical generator according to claim 1, characterised in that the electrolyte contains alkali or alkaline earth metals in cationic form.
Claim 5
Dependent Claim
39 words
An electrochemical generator according to claim 3, characterised in that the alkali metal is lithium in the form of one of its salts chosen from hexafluorophosphate, hexafluoroarsenate, bis (trifluoromethylsulfonyl) imide, trifluoromethanesulfonate, tris (trifluoromethylsulfonyl) methide, tetrafluroborate, perchlorate, tetrachloroaluminate and perfluorobutanesulfate.
Claim 6
Dependent Claim
39 words
An electrochemical generator according to claim 1, characterised in that the electrolyte includes an aprotic solvent selected from δ-butyrolactone, tetrahydrofuran, 1,2-dimethoxyethane, propylene carbonate, ethylene carbonate, dimethylene carbonate, diethylene carbonate, diethyl ether and dioxalane, or a mixture of these solvents.
Claim 7
Dependent Claim
38 words
An electrochemical generator according to claim 1, characterised in that the electrically active material of one electrode, or of each of the two electrodes, is capable of forming an intercalated compound with the alkali or alkaline earth metals.
Claim 8
Dependent Claim
29 words
An electrochemical generator according to claim 6, characterised in that the electrically active material of one electrode is composed of nanocrystalline particles of TiO 2 mainly in octahedrite form.
Claim 9
Dependent Claim
58 words
An electrochemical generator according to claim 2, characterised in that the composition of the negative electrode includes nanocrystalline TiO 2 , and the composition of the positive electrode includes Li y (NiCo)O 2 , the electrolyte being composed of a 1M solution of trifluoromethane sulfonimide of lithium in a mixture 50/50 by weight of ethylene carbonate and dimethoxyethane.
Claim 10
Dependent Claim
76 words
An electrochemical generator according to claim 8, characterised in that the negative electrode is obtained by compression on a current collector of a mixture containing 70 to 95% of nanocrystalline TiO 2 , 2 to 20% graphite, and as binding agent 1 to 10% ethylene propylene diene monomer, at a pressure between 10 and 100 kN·cm -2 , the pellet thereby obtained then being dried in a vacuum at about 160° C. for about 12 hours.
Claim 11
Dependent Claim
77 words
An electrochemical generator according to claim 8, characterised in that the positive electrode is obtained by compression on a current collector of a mixture containing 70 to 90% of Li y (NiCo)O 2 , 1 to 40% of graphite powder, and as binding agent 1 to 20% of polytetrafluoroethylene, at a pressure between 10 and 100 kN·cm -2 , the pellet thereby obtained then being dried in a vacuum at about 160° C. for about 12 hours.
References Cited (Backward Citations)
USRE33149E
Cited
US4049887A
Cited
US4104451A
Cited
EP0127373A2
Cited
EP0251677A2
Cited
DE3826281A1
Cited
US5202201A
Cited
WO1990005387A1
Cited
EP0417802A1
Cited
US5225296A
Cited
EP0460617A2
Cited
US5110696A
Cited
WO1992018425A1
Cited
US5211933A
Cited
WO1993008612A1
Cited
EP0612117A2
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-10-29 | 2000-04-29 | 2000-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-10-29 | 2004-04-29 | 2004-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-10-29 | 2008-04-29 | 2008-10-29 | $7700.00 | Window Closed / Lapsed |