EP1364424A2 - Couche ou feuille pouvant etre activee de maniere electrochimique - Google Patents

Couche ou feuille pouvant etre activee de maniere electrochimique

Info

Publication number
EP1364424A2
EP1364424A2 EP01978345A EP01978345A EP1364424A2 EP 1364424 A2 EP1364424 A2 EP 1364424A2 EP 01978345 A EP01978345 A EP 01978345A EP 01978345 A EP01978345 A EP 01978345A EP 1364424 A2 EP1364424 A2 EP 1364424A2
Authority
EP
European Patent Office
Prior art keywords
layer
textile fabric
film
electrochemically activatable
electrochemically
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP01978345A
Other languages
German (de)
English (en)
Inventor
Ulf Zum Felde
Gerold Neumann
Peter Gulde
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV
Original Assignee
Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE10101299A external-priority patent/DE10101299A1/de
Application filed by Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV filed Critical Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV
Publication of EP1364424A2 publication Critical patent/EP1364424A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/04—Processes of manufacture in general
    • H01M4/0402—Methods of deposition of the material
    • H01M4/0404—Methods of deposition of the material by coating on electrode collectors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0436—Small-sized flat cells or batteries for portable equipment
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/04—Processes of manufacture in general
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/04—Processes of manufacture in general
    • H01M4/0402—Methods of deposition of the material
    • H01M4/0414—Methods of deposition of the material by screen printing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/04—Processes of manufacture in general
    • H01M4/0402—Methods of deposition of the material
    • H01M4/0416—Methods of deposition of the material involving impregnation with a solution, dispersion, paste or dry powder
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/04—Processes of manufacture in general
    • H01M4/043—Processes of manufacture in general involving compressing or compaction
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/04—Processes of manufacture in general
    • H01M4/043—Processes of manufacture in general involving compressing or compaction
    • H01M4/0435—Rolling or calendering
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/04—Processes of manufacture in general
    • H01M4/0483—Processes of manufacture in general by methods including the handling of a melt
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/04—Processes of manufacture in general
    • H01M4/0483—Processes of manufacture in general by methods including the handling of a melt
    • H01M4/0485—Casting
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/403—Manufacturing processes of separators, membranes or diaphragms
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/403—Manufacturing processes of separators, membranes or diaphragms
    • H01M50/406—Moulding; Embossing; Cutting
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/409—Separators, membranes or diaphragms characterised by the material
    • H01M50/44—Fibrous material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/489—Separators, membranes, diaphragms or spacing elements inside the cells, characterised by their physical properties, e.g. swelling degree, hydrophilicity or shut down properties
    • H01M50/497—Ionic conductivity
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M6/00—Primary cells; Manufacture thereof
    • H01M6/30—Deferred-action cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M6/00—Primary cells; Manufacture thereof
    • H01M6/40—Printed batteries, e.g. thin film batteries

Definitions

  • ⁇ to ß ⁇ ⁇ P- P- ⁇ ß P- P- P- ⁇ ⁇ iP ⁇ p rt er Q. ⁇ • ⁇ ⁇ - ⁇ r- ⁇ P- 1 er rt P- ß tt tr co ⁇ rt ⁇ tt O ß o ⁇ S ⁇ ß - ⁇ ⁇ ⁇ ⁇ ß P- ⁇ P- co ⁇ P- ⁇ ⁇ ⁇ ß P- ⁇ P- co ⁇ P- ⁇ ß et rt ß ⁇ Qr rt ß ß ⁇ tr ⁇ P- tt er tt P- DJ P- Cfl -P- ß rt ⁇ ⁇ fl ⁇ ß ⁇
  • the layers and foils according to the invention or the layer produced therefrom should provide products with electrochemical properties, such as rechargeable batteries (accumulators), electrochromic components or the like, which have high flexibility and very good electron and ion conduction properties.
  • electrochemical properties such as rechargeable batteries (accumulators), electrochromic components or the like, which have high flexibility and very good electron and ion conduction properties.
  • the object is achieved in that pastes with relatively low binder / plasticizer contents are introduced into a preferably flexible textile fabric.
  • the fabric takes on the task of mechanical stability
  • the invention accordingly provides an electrochemically activatable layer or film for use in electrochemical components which contains a textile fabric and, at least in the interstices of the textile fabric, a mass composed of at least one organic polymer, its precursors or its prepolymers, or of these components existing matrix and an electrochemically activated, non-soluble in the matrix inorganic material in the form of a solid substance.
  • the expression “usable in electrochemical components” implies that the electrochemically activatable inorganic material in the form of a solid substance must be an ion-conducting or electron-conducting material, or both at the same time, which can be used as electrode material or solid electrolyte or the like. suitable in a corresponding electrochemical component.
  • the term “flat textile structure” is understood to mean any structure that can be produced using textile fiber materials (textile fibers) and that is a flat structure. Textile fibers include natural fibers (vegetable and animal fibers), so-called chemical fibers from essentially organic polymers, as well as all other industrially producible fibers such as glass, ceramic, metal, mineral or carbon fibers.
  • FIG. 1 shows the sequence of a layer composite according to the invention, in which both the electrodes and the electrolyte are embedded in a tissue.
  • Figure 2 shows an electrode film with embedded metallized tissue.
  • FIG. 3 shows a charge-discharge curve of a lithium battery according to example 4.
  • FIG. 4 shows the decrease in the initial capacity of this cell with an increasing number of charge-discharge steps (number of cycles).
  • Textile fabrics in the form of woven fabrics are well suited for the present invention, the mechanical behavior and mobility of their fabric being well adapted to their environment in the electrochemical component.
  • the fibers of the textile fabric can of course also be in a different form, for example laid as a fleece or the like, knitted or otherwise combined to form a flat textile structure.
  • P- d P- ß ⁇ ⁇ d P- ⁇ s: 3 ⁇ tt ⁇ s; ⁇ ß Cfl tt ⁇ ⁇ o P- rt ⁇ ⁇ ⁇ EP 3 ß 3 ß ⁇ rt 3 CQ er fr • ⁇ et ß ⁇ 3 ⁇ tt ⁇ ⁇ P- ⁇ tn s; tr tt Cfl Cd ß tt ⁇ er ⁇
  • the mass which is at least in the spaces between the textile fabric, can be produced as follows:
  • a variety of materials can be used for the matrix (A). You can work with solvent-free or solvent-based systems. Suitable solvent-free systems are, for example, crosslinkable, liquid or pasty resin systems. Examples of these are resins made from crosslinkable addition polymers or condensation resins. For example, pre-condensates of phenoplasts (novolaks) or aminoplasts can be used which, after the pasty mass has been shaped, are finally crosslinked to form an electrochemical layer composite. Further examples are unsaturated polyesters which can be crosslinked by graft copolymerization with styrene, by bifunctional ones
  • Reactants curable epoxy resins (example: bisphenol A epoxy resin, cold-cured with polyamide), crosslinkable polycarbonates such as polyisocyanurate crosslinkable by a polyol, or binary polymethyl methacrylate, which can also be polymerized with styrene.
  • a paste-like mass is obtained, each of which consists of the more or less viscous precondensate or uncrosslinked polymer as the matrix (A) or using essential constituents thereof, together with the.
  • Component (B) is formed.
  • Main chain are possible, but also polymers with heteroions in the main chain such as polyamides, polyesters, proteins or polysaccharides.
  • the polymers can be homo- or copolymers; the copolymers can be random copolymers, graft copolymers, block copolymers or polyblends; there is no restriction here.
  • Natural or synthetic rubbers for example, can be used as polymers with a pure carbon main chain. Fluorinated ones are particularly preferred Hydrocarbon polymers such as Teflon, polyvinylidene fluoride (on PVDF) or polyvinyl chloride, since this enables particularly good water-repellent properties to be achieved with the films or layers formed from the pasty mass. This gives the electrochemical components produced in this way particularly good long-term stability.
  • polystyrene or polyurethane examples are polystyrene or polyurethane.
  • copolymers are copolymers of Teflon and amorphous fluoropolymer and polyvinylidene fluoride / hexafluoropropylene (commercially available as Kynarflex).
  • polymers with heteroatoms in the main chain are polyamides of the diamine-dicarboxylic acid type or of the amino acid type, polycarbonates, polyacetals, polyethers and acrylic resins.
  • Other materials include natural and synthetic polysaccharides (homo- and heteroglycans), proteoglycans, for example starch, cellulose,
  • Methyl cellulose Methyl cellulose. Substances such as chondroitin sulfate, hyaluronic acid, chitin, natural or synthetic waxes and many other substances can also be used. In addition, the abovementioned resins (precondensates) can also be used in solvents or diluents.
  • Solvents or swelling agents for the abovementioned polymers are known to the person skilled in the art.
  • Plasticizers or “plasticizers” are to be understood here as substances whose molecules are bound to the plastic molecules by secondary valences (Van der Waals forces). By doing so, you reduce the
  • plasticizers for the respective plastic groups. They must be compatible with the plastic in which they are to be incorporated. Common plasticizers are high-boiling esters of phthalic acid or phosphoric acid, for example dibutyl phthalate or dioctyphthalate. Also suitable are, for example, ethylene carbonate, propylene carbonate, dimethoxyethane, dimethyl carbonate, diethyl carbonate, butyrolactone, ethyl methyl sulfone, polyethylene glycol, tetraglyme, 1,3-dioxolane or S, S-dialkyldithiocarbonate.
  • the plasticizer can then be detached from the pasty mass with a suitable solvent or by evaporation (for example under vacuum and / or elevated temperatures). Any cavities that may arise may be caused by the following. Pressing and lamination processes for joining the different layers are closed. This improves the electrochemical stability of the charged accumulator.
  • a solid electrolyte in the plastic matrix described it is desirable to have an ionic conductivity of at least 10 "4 S cm"" 1 .
  • these can also be filled with a second solid or liquid electrolyte or electrode material after the plasticizer has been removed.
  • the present layers according to the invention are suitable for a large number of electrochemical components such as accumulators, electrochromic components and in particular rechargeable electrochemical cells based on solids.
  • electrochemical components such as accumulators, electrochromic components and in particular rechargeable electrochemical cells based on solids.
  • the person skilled in the art can select the same solid substances (B) that he uses for classic electrochemical components, ie those without the addition of plastics, would use.
  • LiTa0 3 • SrTi ⁇ 3, iTi2 (PO4) 3 -Li ⁇ 2, LiH 2 (P ⁇ 4) 3 -Li 0, Li 4 Si0 4 -Li3P0 4 , LiX + ROH with X C1, Br, I (1, 2 or 4 ROH per LiX).
  • the present invention is of course not limited to batteries in lithium technology, but, as already mentioned above, includes all those systems that are also "conventional” technology, i. H. can be produced without incorporating an organic polymer matrix.
  • electrochemical components for example accumulators, can be produced, which are located in the charging / discharging curves
  • Graphite or amorphous carbon (soot) or a mixture of both can also be incorporated into the pasty mass with electrode material for a positive or negative electrode.
  • parts by weight of 20 to 80% by weight of amorphous carbon, based on the electrochemically activatable component are advantageous.
  • the mass is provided for a positive electrode, the lubricating effect of the carbon is to be mentioned as an advantageous property, which improves the mechanical flexibility of a layer produced from the pasty mass.
  • the mass is provided for a negative electrode, the electrochemical stability and the electronic conductivity are additionally improved, as already described above.
  • the layer according to the invention can also be used for electrodes other than Intercalation electrodes are used.
  • An example of this is the use of metal powder in combination with an alkali or alkaline earth salt as an electrochemically activatable solid substance (B).
  • a pasty mass produced in this way can be used for the production of decomposition electrodes. This eliminates the volume expansion typical of intercalation electrodes, which leads to improved aging resistance.
  • An example of this is the combination of copper plus lithium sulfate.
  • the electrode material (B) is a metal that does not react with lithium and also contains a lithium salt.
  • the matrix (A) in this variant is produced from a combination of plastic with a plasticizer, which is then removed from the pasty mass again.
  • the cavities formed should not be used when the electrochemically activatable layers are subsequently laminated under pressure or the like. getting closed; rather, it is important to ensure that they remain open.
  • a lithium salt in the adjacent electrolyte layer such composite electrode has the 'property of reversibly switched lithium in the resulting cavities, and can expand. It has the advantages of an intercalation electrode, but avoids its disadvantages (e.g. volume expansion) and has excellent electrical properties due to the large inner surface.
  • Nickel is an example of a metal that does not react with lithium.
  • the solid substance (B) is an electrode material or an electrolyte material, it can consist of a lithium ion conductor and one or more further ion conductors (eg for Li, Cu, .Ag, Mg, F, Cl, H). Electrodes and electrolyte layers produced in this way have particularly favorable electrochemical properties such as capacity, energy density, mechanical and electrochemical stability.
  • the mass to be introduced into the fabric can additionally contain a second solid ion, electron and / or 1 a mixed conductor (C).
  • a second solid ion, electron and / or 1 a mixed conductor (C) This can be worked into the matrix in different ways. If it is an ion conductor which is soluble in a solvent - for example that in which the matrix material (A) is also soluble - the mass can be produced by the solvent for the matrix material containing this second ion conductor.
  • the vapor pressure of the solvent must be so high that it can be expelled at a later stage (e.g. after intimately mixing the constituents of the mass, even if it has a pasty consistency without the presence of the solvent, or after generating the Layer or foil).
  • plasticizer which is also soluble in the solvent and which can then optionally be removed again using the solvent mentioned.
  • This embodiment of the invention can also be accomplished with such conductors (C) which have a relatively poor conductivity (in particular ion conductivity if this property is to be present).
  • an ion, electron or mixed conductor (C) can be selected, which is soluble in the selected plasticizer for the system.
  • the plasticizer should have a relatively low vapor pressure.
  • ⁇ tt ß X ⁇ ⁇ tt ri ⁇ ⁇ ⁇ ⁇ tt tt ra ß tt tt tt P 1 tt P- tt ra P- ⁇ tt tt tt s ⁇ P 1 P- ra tt P> tt H, ⁇ rt ß tt er fr ß s ⁇ rt ⁇ s ⁇ s CQ • ⁇ ?
  • ß ⁇ ra ri ⁇ M ß er ⁇ ß to ß tt 1 P- P- ⁇ er rt ß tt S ⁇ P- 3 ß P 1 TI 0 Hi tt 0 ⁇ -3 tt t 1 tr 1 d ß P- P 1 Hi rt ⁇ ⁇ 3 N - ß ß ß P- 0 ⁇ s ⁇ P- CQ ⁇ SD: tt rt N P- ß ⁇ 0 ⁇ P- P 1 rt s ⁇ tt 1 ß: O: ß N tr tt P- rt N ra m ß s ⁇ tt ⁇ m H m ⁇ d ⁇ P - P 1 P- - ⁇ i P 1 p- s ⁇ ⁇ tt P 1 d ⁇ td m -3 ⁇ ra ⁇ ⁇ tt ⁇ pr TI r
  • the present invention therefore encompasses self-supporting or electrochemically active or activatable layers, preferably in the indicated thicknesses, which can be produced from the pasty materials and textile fabrics described above.
  • the layers are preferably flexible.
  • the self-supporting layers films, tapes
  • the pasty masses are solidified, for example, by hardening (of resins or other precondensates), by crosslinking prepolymers or linear polymers, by evaporation of solvents or in a similar manner.
  • crosslinkable resin compositions as described above for the pasty compositions, are used and, after the layer has been formed, cured by UV or electron radiation. Curing can of course also be effected thermally or chemically (for example by immersing the layer produced in a corresponding bath). If appropriate, suitable initiators or accelerators or the like are added to the compositions. added for the respective networking.
  • the present invention further relates to laminates with electrochemical properties, such as . in particular accumulators and other batteries or electrochromic components, very particularly preferably rechargeable electrochemical cells,
  • Layer is connected to a carrier layer by pressure rollers, calender coating with two or three nips, in which in addition to the pasty mass, the carrier web comes in, or doubling (bonding under pressure and back pressure of preferably heated rollers).
  • pressure rollers calender coating with two or three nips, in which in addition to the pasty mass, the carrier web comes in, or doubling (bonding under pressure and back pressure of preferably heated rollers).
  • calender coating with two or three nips, in which in addition to the pasty mass, the carrier web comes in, or doubling (bonding under pressure and back pressure of preferably heated rollers).
  • a pressing process during the bonding (lamination) of the individual layers can often be desired, not only for better bonding (and thus achieving better conductivity) of the individual layers, but also, for example, in order to eliminate any cavities that may be present in the individual layers for example, as described above, by washing plasticizers or the like. Common techniques can be used for this. Cold pressing (at temperatures below 60 ° C.) can advantageously be carried out, provided the materials used allow this. This ensures particularly good contact between the individual layers.
  • the layers produced as described can be impregnated with an electrolyte solution (e.g. a lithium salt dissolved in an organic solvent such as propyl carbonate and / or ethyl carbonate or the like) before or after lamination.
  • an electrolyte solution e.g. a lithium salt dissolved in an organic solvent such as propyl carbonate and / or ethyl carbonate or the like
  • Such electrolyte solutions are known to the person skilled in the art and some are also commercially available.
  • rechargeable electrochemical cells can be produced using thick-film technology, ie with individual, do H 1 c ⁇ O oo c ⁇
  • Sealing it is also possible to introduce sealing compound into the tissue in the area where the contact tongue is passed through the sealing seam before the sealing, for example using a dispenser. Due to the fabric structure, this adheres particularly well in contrast to application to metal strips.
  • Example 1 To produce a positive electrode, 2 g of PVDF-HFP are combined with 1 g of ethylene carbonate and 100 g of acetone. Then 14 g of LiCo0 2 and 3 g of conductive carbon black are added in the form of fine powders. These constituents are then intimately mixed with one another by vigorous stirring. A commercially available aluminum-coated fabric is then dipped into this paste. The fabric thickness was 150 ⁇ m. After the tissue has been pulled out of the paste in a controlled manner, it is filled with paste. The filled tissue is then dried and dipped again. The desired layer thickness can be set by alternately drying and dipping. A stable and highly flexible film was obtained which was used as a positive electrode in a lithium accumulator.
  • Example 2 A negative electrode was produced by alternately dipping and drying a copper-coated fabric 150 ⁇ m thick.
  • the paste was prepared as follows. 2 g of PVDF-HFP were stirred with 1 g of ethylene carbonate and 100 g of acetone O
  • FIG. 4 shows the decrease in the initial capacity as a function of the number of cycles.

Abstract

Couche ou feuille pouvant être activée de manière électrochimique, destinée à être utilisée dans des composants électrochimiques, qui comporte une structure plane textile et une masse se trouvant au moins dans les interstices de la structure plane textile. Ladite masse est constituée d'au moins une matrice qui contient un polymère organique, ses précurseurs ou ses prépolymères ou qui est composée desdites substances, et d'une matière organique pouvant être activée de manière électrochimique et non soluble dans la matrice, sous forme de substance solide. La présente invention concerne également des composites laminés et des cellules électrochimiques rechargeables construits à partir de ces couches ou feuilles. Elle concerne encore une série de procédés de production desdites couches ou feuilles.
EP01978345A 2000-09-14 2001-09-06 Couche ou feuille pouvant etre activee de maniere electrochimique Withdrawn EP1364424A2 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE10045561 2000-09-14
DE10045561 2000-09-14
DE10101299A DE10101299A1 (de) 2000-09-14 2001-01-12 Elektrochemisch aktivierbare Schicht oder Folie
DE10101299 2001-01-12
PCT/EP2001/010293 WO2002023662A2 (fr) 2000-09-14 2001-09-06 Couche ou feuille pouvant etre activee de maniere electrochimique

Publications (1)

Publication Number Publication Date
EP1364424A2 true EP1364424A2 (fr) 2003-11-26

Family

ID=26007055

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01978345A Withdrawn EP1364424A2 (fr) 2000-09-14 2001-09-06 Couche ou feuille pouvant etre activee de maniere electrochimique

Country Status (6)

Country Link
US (1) US20030180610A1 (fr)
EP (1) EP1364424A2 (fr)
JP (1) JP2004537139A (fr)
CN (1) CN1516907A (fr)
CA (1) CA2422212A1 (fr)
WO (1) WO2002023662A2 (fr)

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US8728285B2 (en) 2003-05-23 2014-05-20 Demaray, Llc Transparent conductive oxides
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CA2422212A1 (fr) 2003-03-13
CN1516907A (zh) 2004-07-28

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