Classifications

• • 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
  • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
• • 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
  • H01M10/044—Small-sized flat cells or batteries for portable equipment with bipolar electrodes
• • 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
  • H01M10/058—Construction or manufacture
  • H01M10/0585—Construction or manufacture of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
• • 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
  • H01M4/36—Selection of substances as active materials, active masses, active liquids
  • H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
• • 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
  • H01M4/64—Carriers or collectors
  • H01M4/66—Selection of materials
  • H01M4/663—Selection of materials containing carbon or carbonaceous materials as conductive part, e.g. graphite, carbon fibres
• • 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
  • H01M4/64—Carriers or collectors
  • H01M4/70—Carriers or collectors characterised by shape or form
• • 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
  • H01M4/64—Carriers or collectors
  • H01M4/70—Carriers or collectors characterised by shape or form
  • H01M4/80—Porous plates, e.g. sintered carriers
  • H01M4/806—Nonwoven fibrous fabric containing only fibres
• • 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
  • H01M50/10—Primary casings; Jackets or wrappings
  • H01M50/116—Primary casings; Jackets or wrappings characterised by the material
  • H01M50/117—Inorganic material
  • H01M50/119—Metals
• • 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
  • H01M50/10—Primary casings; Jackets or wrappings
  • H01M50/116—Primary casings; Jackets or wrappings characterised by the material
  • H01M50/121—Organic 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
  • H01M50/10—Primary casings; Jackets or wrappings
  • H01M50/116—Primary casings; Jackets or wrappings characterised by the material
  • H01M50/124—Primary casings; Jackets or wrappings characterised by the material having a layered structure
• • 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
  • H01M50/50—Current conducting connections for cells or batteries
  • H01M50/528—Fixed electrical connections, i.e. not intended for disconnection
  • H01M50/529—Intercell connections through partitions, e.g. in a battery casing
• • 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
  • H01M50/50—Current conducting connections for cells or batteries
  • H01M50/531—Electrode connections inside a battery casing
  • H01M50/536—Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding
• • 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
  • H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
  • H01M2004/027—Negative electrodes
• • 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
  • H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
  • H01M2004/028—Positive electrodes
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M2220/00—Batteries for particular applications
  • H01M2220/30—Batteries in portable systems, e.g. mobile phone, laptop
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
  • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
  • Y02E60/10—Energy storage using batteries
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
  • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
  • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

• the present invention relates to a lithium-ion battery.
• a lithium-ion battery generally comprises several electrochemical cells connected in series.
• Each cell has a current collector of the positive electrode, this collector is for example aluminum, a positive electrode consisting of lithium cation insertion materials. These materials are generally composite materials, for example LiFePO4, or transition metal oxide (lamellar materials: LiCoO2: lithiated cobalt oxide, LiNi0.33Mn0.33Co0.33O2 etc.), a negative electrode, for example in graphite carbon, lithium metal or in the case of power electrodes in Li 4 Ti50i2, a current collector of the negative electrode.
• This collector is for example copper for a graphite carbon electrode or aluminum in the case of LUTisOi.
• the positive and negative electrodes are placed opposite one another and an electrolyte is placed between the two and in contact with the electrodes.
• the electrolyte is contained in a microporous polymer or composite separator, the separator allowing the displacement of the lithium ion from the positive electrode to the negative electrode under charge, and vice versa in discharge.
• the electrolyte is a mixture of organic solvents, most often carbonates in which a LiPF6 lithium salt is added in most cases.
• a package or housing is provided around the cell or cells.
• the cells are connected in series via generally an external electrical circuit.
• 4 cells of nominal voltage 3.2 V or 3.7 V depending on the technologies used are connected in series.
• the connections are mainly established by electric cables soldered to the battery terminals or connectors (in the case of rigid accumulators).
• the battery terminals or connectors in the case of rigid accumulators.
• collectors conventionally used in industry and research laboratories in the field of lithium-ion batteries are metallic.
• the collectors used are made of aluminum for positive electrodes and titanate Li 4 TisOi 2, graphite (Cgr), silicon (Si) or even silicon carbide (Si-C), stainless steel, nickel, copper, in nickel-plated copper ... for the negative electrode.
• the metal collectors have a high density, the lithium-ion batteries then lose in mass energy density.
• the resulting mass of the bipolar battery comprising such collectors can be troublesome in nomadic applications.
• collectors made of a woven or non-woven carbon fiber material on which the electrodes are for example not printed.
• the carbon fiber material has a low density, the mass energy density of the cell is then reduced.
• collectors are of interest in the case of nomadic application because of their low mass.
• the voltage of the Li-ion battery generally does not exceed 4V, at best 5V.
• collectors which carry on one side a positive electrode on another side a negative electrode.
• Such collectors are called bipolar collectors and the battery comprising such collectors is a bipolar battery.
• a battery is for example described in the document US2005 / 0069768.
• the cells are then stacked on top of each other and connected to each other by the aluminum collectors.
• the battery has a certain mass.
• this battery comprising a stack of cells has a certain bulk and its shape is not necessarily suitable for nomadic applications.
• a lithium-ion battery comprising at least two cells connected in series, each cell comprising a current collector and a negative electrode and a current collector and a positive electrode, at least one current collector.
• each cell being integral with a collector of the other cell carrying an electrode of opposite polarity, the collector being of carbon fibers and the electrodes carried by this collector being such that the areas covered by the positive and negative electrodes on the collector are entirely separate from each other.
• the collectors may be of woven or non-woven carbon fiber.
• the invention it is possible to produce batteries with increased voltage compared to that of a single cell with collectors carbon fiber.
• the structure of the cell is such that the positive electrode is not formed on an opposite face of the collector to that on which the negative electrode is formed in line with it, there is then no risk of direct contact between the positive and negative electrodes.
• the bipolar battery may have a substantially flat configuration suitable for nomadic applications.
• the carbon fiber collectors have a certain flexibility, especially the woven carbon fiber collectors which allows the realization of relatively flexible bipolar batteries very adapted to new technologies such as flexible screens, and mobile applications.
• the battery can take different configurations.
• the battery has an increased mass energy density and a reduced mass.
• the carbon fibers form both the negative electrode and the collector of the negative electrode. Manufacturing is simplified and the battery's weight is further reduced.
• the collectors made of carbon fibers have a certain flexibility, they can make it possible to produce flat and flexible batteries.
• the subject of the present invention is then a bipolar lithium-ion battery comprising n electrochemical cells connected in series, n being an integer greater than or equal to 2, each electrochemical cell comprising a positive electrode, a current collector carrying the positive electrode, a negative electrode, a current collector carrying the negative electrode, an electrolyte disposed between each pair of positive and negative electrodes.
• a current collector of each cell, said common current collector is integral with the current collector of an adjacent cell, the common current collector carrying an electrode of each polarity, and at least the n-1 Common current collectors are made of carbon fiber material.
• all current collectors are carbon fiber.
• the n-1 common collectors may comprise a negative electrode area of area at least equal to the surface of the negative electrode, a positive electrode area area at least equal to the surface of the positive electrode and a zone of reduced surface connection with respect to this positive and negative electrode areas between the negative electrode area and the positive electrode area.
• each of the cells is housed in a sealed compartment relative to that of the other cells.
• the compartments are flexible.
• Negative electrodes can be made of titanate (Li 4 Ti 50i 2 ), silicon, silicon carbide ...
• the negative electrodes are formed directly by current collector zones facing a positive electrode.
• the present invention also relates to a method for producing a bipolar battery according to the invention, comprising the steps
• n-2 positive electrodes carried by n-2 collectors common common with a negative electrode of the n-2 common collectors and facing a positive electrode remaining carried by a common current collector with the individual current collector negative electrode and one remaining negative electrode of a common current collector with the positive electrode of the other individual current collector,
• the production method may comprise the step of producing a sealed compartment for each cell.
• the step of producing a sealed compartment for each cell may comprise placing the cells in at least one envelope and sealing the cells and sealing said at least one envelope.
• Step f) can be performed after placing the cells in the envelope and before sealing the envelope.
• heat-sealable strips are disposed on the common current collectors in the area between the positive and negative electrodes, the method then including heat application on the heat-sealable strips.
• the positive electrodes and / or the negative electrodes are produced by printing, for example by screen printing.
• FIG. 1 is a schematic representation of an exploded view of a battery according to an exemplary embodiment
• FIG. 2 is a view from the outside of a three-cell battery in series according to an exemplary embodiment
• FIG. 3 is a schematic representation of an exemplary battery according to the invention, its envelope being shown in transparency.
• the battery comprises three cells in series, but the battery may comprise at least two cells or more than three cells, the number of cells being chosen according to the desired nominal voltage.
• FIG. 1 an exemplary embodiment of a three-cell battery C1, C2, C3 can be seen.
• the positive electrodes are symbolized by the sign + and the negative electrodes are designated by the sign -.
• the cell C1 comprises a positive electrode PI in direct contact with a current collector 2, a negative electrode NI in direct contact with a current collector 4, an electrolyte 6.1 between the positive electrodes PI and negative NI.
• the cell C2 comprises a positive electrode P2 in direct contact with the current collector 4, a negative electrode N2 in direct contact with a current collector 6, an electrolyte 6.2 between the positive electrodes P2 and negative N2.
• the cell C3 comprises a positive electrode P3 in direct contact with the current collector 6, a negative electrode N3 in direct contact with a current collector 8, an electrolyte 6.3 between the positive electrodes P3 and negative N3.
• the cells C1 and C2 are connected electrically in series by the current collector 4 and the cells C2 and C3 are electrically connected in series by the current collector 6.
• the collectors 2 and 4 also form the terminals of the battery, allowing its connection to either a user device or a charging device.
• the cells are separated from each other in a sealed manner.
• the current collector 4 comprises a first zone 4.1 on which the negative electrode NI is located, a second zone 4.2 on which the positive electrode P2 is located and a third connection zone 4.3 between the first zone 4.1 and the second zone 4.2. .
• the current collector 6 comprises a first zone 6.1 on which the negative electrode N2 is located, a second zone 6.2 on which the positive electrode P3 is located and a third connection zone 6.3 between the first zone 6.1 and the second zone 6.2. .
• Separators S1, S2, S3 are interposed between the positive and negative electrodes PI, NI, P2, N2 and P3, N3 respectively.
• the separators are porous, more particularly microporous and receive the electrolyte.
• the positive electrode and the negative electrode are each made on an area of the collector, on the same face of the collector. In alternatively, it could be envisaged that they are each performed on an area of the collector, ie on non-superimposed areas, and on opposite sides of the collector.
• the third connection areas 4.3, 6.3 are of reduced surface with respect to the areas 4.1, 4.2, 6.1, 6.2 carrying the electrodes.
• Zones 4.3, 6.3 are in the example shown on one edge of the collector but could be located at any other position between the areas carrying the electrodes.
• the zones 4.3, 6.3 could extend obliquely between the zones carrying the electrodes.
• the shape of the collectors and electrodes is in no way limiting.
• the electrodes could for example be in the form of disc or any other form.
• the collectors 4 and 6 may be rectangular, the connection extending over the entire width of the collector.
• the collectors 4 and 6 extend substantially along an axis and the collectors are arranged relative to each other so that their axes are parallel.
• the collectors could be arranged relative to each other so that their axes are not parallel, for example orthogonal, in this case the battery would extend in a plane.
• the collectors 4 and 6 may not extend along an axis but for example the connection area could have a right angle or any other angle, or even have a certain curvature.
• Collectors 4 and 6 are in one piece. They are made from carbon fibers that can be either woven or non-woven forming a felt.
• the collectors are of woven carbon fibers when greater flexibility between the cells is desired.
• the collectors 2 and 8 are also made from carbon fibers. But we could predict that they are made of metal.
• the cells are each received in a sealed compartment 10.1, 10.2, 10.3.
• the cells are received in flexible compartments formed from a single envelope 12. Alternatively, they could be three separate envelopes. In another variant the compartments could be rigid.
• the cells also each comprise an electrolyte. This is for example injected into the compartments just before sealing.
• the positive or negative electrodes may for example be made by printing directly on the carbon fiber collectors using an ink comprising the active material.
• this is a screen printing preferably carried out under suction so that the ink penetrates between the carbon fibers.
• the electrodes obtained offer very good adhesion to the collector because of the mechanical anchoring obtained by suctioning the ink. Indeed the material of the electrode is entangled between the carbon fibers.
• the electrical conduction between the collector and the electrode is improved because there appears to be an interpenetration between the electrode and the percussive network of conductive carbon fibers.
• the active material or the negative electrode can or may be selected from titanate ( ⁇ 4 ⁇ 5 ⁇ ⁇ 2), silicon, silicon carbide ...
• the negative electrode or electrodes are formed directly by the material of the collector, ie the negative electrode (s) is (are) of carbon fibers.
• the inventors have found that a carbon fiber material is capable of inserting or disinsulating Li + cations, thus fulfilling the function of negative electrode. It has been found that a carbon fiber electrode has substantially the same specific capacity as a graphite carbon electrode, of the order of 300-310 mAh / g, while having a reduced mass.
• the basis weight of the positive electrode (s) and the thickness of the carbon fiber collector forming the negative electrode are adapted to balance the capacity of the positive electrode and the capacity of the negative carbon fiber electrode.
• the active materials for the positive electrodes mentioned above are suitable for operation with negative carbon fiber electrodes.
• the collectors made of carbon fiber have a thickness for example between 50 ⁇ and 300 ⁇ .
• the thickness is preferably between 150 ⁇ and 300 ⁇ .
• the thickness is preferably less than 150 ⁇ and advantageously of the order of 50 ⁇ .
• carbon fiber collectors makes it possible to substantially reduce the mass of each cell and that of the battery and thus substantially increase the mass energy density of the battery.
• the battery comprises in this example negative electrodes formed directly by the collectors.
• the carbon fiber collectors are provided, these are for example cut in a carbon fiber felt to desired dimensions.
• Two collectors similar to the collectors 4 and 6 of FIG. 1 and two collectors similar to the collectors 2 and 8 are provided.
• the positive electrodes are made on a first zone of each collector.
• the positive electrodes are advantageously produced by printing, preferably by screen printing.
• the ink used to print the positive electrodes can have the following composition:
• LiFeP0 4 Pulead ® forming the active material
• spherical graphical carbon such as Super P (or SP) forming the electronic conductor
• graphical carbon fibers of Vgcf type forming the electronic conductor
• PAAc type polymer binder Poly (acrylic acid )
• an aspiration is made through the collector during printing to improve the impregnation of the fibers with the ink.
• each positive electrode is opposite a collector zone made of carbon fibers.
• Three porous separators are then placed between the electrodes.
• the separators are for example Celgard 2400 ® membranes.
• the assembly thus formed is disposed in a single envelope 12.
• the envelope is for example made from a flexible composite material.
• the composite material is multilayer and comprises a stack of aluminum layers coated with a polymer.
• the polymeric material is chosen from polyethylene, propylene and polyamide.
• An adhesive layer is provided between the aluminum and the polymer layer, for example it comprises polyester-polyurethane.
• the envelope is for example a composite envelope manufactured by Showa-Denko ® . Collectors 2 and 8 are dimensioned to protrude from the package and allow electrical connection of the battery to the outside.
• the cells are sealed with heat sealing strips, for example hot-melt polymer for example polyethylene, polypropylene located between two cells.
• heat sealing strips for example hot-melt polymer for example polyethylene, polypropylene located between two cells.
• polyethylene for separating cells and, more generally, the use of heat-sealing strips makes it possible to fill the pores of the carbon fiber collectors and to effectively seal between the cells without degrading the electrical conductivity. in this by simple melting, for example by applying a temperature of the order of 180 ° C for the polyethylene.
• Each cell C1, C2, C3 (shown in dotted line) is then received in its own compartment 10.1, 10.2, 10.3 respectively.
• the implementation of a single envelope E (shown in dashed lines in FIG. 3) for making all the compartments has the advantage of making it possible to easily achieve the tight separation of the cells and makes it possible to protect the carbon fiber connection zones. between the cells.
• the compartments are sealed by applying heating to the envelope on the contours of each cell, for example localized heating is applied at a temperature of the order of 180 ° C under vacuum.
• An opening is provided in each compartment to then fill each compartment with an electrolyte and the compartments are sealed.
• the envelope can be thermally sealed on three sides and the fourth side is used to fill the cells with the electrolyte. The fourth side is then thermally sealed.
• the electrolyte is for example a mixture of EP / PC / DMC (1/1/3) 1 M UPF6) + 2% by mass of VC. This is the LP10.
• LP10 is a mixture of organic solvents in which LiPF6 (lithium hexafluorophosphate) is dissolved at a concentration of 1 mol.L-1.
• the constituent solvents of the mixture are: ethylene carbonate (EC), propylene carbonate (PC) and finally dimethyl carbonate (DMC) in proportions 1/1/3 by volume in which an additive vynilene carbonate (VC) is added to the percentage of 2% by mass.
• the electrolytic media of the three cells are sealed and the electrical continuity between the cells is provided by the carbon fiber collectors.
• the invention makes it possible to reduce the problems of leaktightness of the battery, in fact the thermal seals of the flat elements are easier than the sealing in the case of three-dimensional structures.
• the battery has a specific capacity of 28.8 mAH and can reach a nominal voltage of 9. , 6V and a maximum voltage of 11.1V, each cell having a voltage of 3.2V.
• the carbon fiber collectors have a certain flexibility, especially the woven carbon fiber collectors, it is easy to make flexible batteries that can feed objects such as flexible screens and / or batteries. any forms.
• the batteries can be planar or extend in the three directions of space. It is possible to wind the cells or fold them so as to form a stack.

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• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Electrochemistry (AREA)
• General Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Manufacturing & Machinery (AREA)
• Materials Engineering (AREA)
• Inorganic Chemistry (AREA)
• Secondary Cells (AREA)
• Battery Electrode And Active Subsutance (AREA)

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• 2015
  • 2015-11-24 FR FR1561296A patent/FR3044169B1/fr not_active Expired - Fee Related
• 2016
  • 2016-11-24 US US15/778,054 patent/US20180366770A1/en not_active Abandoned
  • 2016-11-24 EP EP16800985.0A patent/EP3381073A1/de not_active Withdrawn
  • 2016-11-24 WO PCT/EP2016/078665 patent/WO2017089454A1/fr active Application Filing

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