WO2019082575A1 - Procédé de fabrication de feuille d'électrode de collecteur de courant, rouleau de compression, feuille d'électrode de collecteur de courant et batterie - Google Patents

Procédé de fabrication de feuille d'électrode de collecteur de courant, rouleau de compression, feuille d'électrode de collecteur de courant et batterie

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Publication number
WO2019082575A1
WO2019082575A1 PCT/JP2018/035351 JP2018035351W WO2019082575A1 WO 2019082575 A1 WO2019082575 A1 WO 2019082575A1 JP 2018035351 W JP2018035351 W JP 2018035351W WO 2019082575 A1 WO2019082575 A1 WO 2019082575A1
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WO
WIPO (PCT)
Prior art keywords
electrode sheet
current collector
compression
collector electrode
region
Prior art date
Application number
PCT/JP2018/035351
Other languages
English (en)
Japanese (ja)
Inventor
大 綾
真佑子 小山
金澤　進一
Original Assignee
Ｎｅｃエナジーデバイス株式会社
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
Application filed by Ｎｅｃエナジーデバイス株式会社 filed Critical Ｎｅｃエナジーデバイス株式会社
Priority to JP2019549958A priority Critical patent/JPWO2019082575A1/ja
Publication of WO2019082575A1 publication Critical patent/WO2019082575A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B3/00—Presses characterised by the use of rotary pressing members, e.g. rollers, rings, discs
    • 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
    • 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
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • 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
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H01M4/139—Processes of manufacture
    • 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
    • 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

Definitions

  • the present invention relates to a method of manufacturing a current collector electrode sheet, a compression roller, a current collector electrode sheet, and a battery.
  • Such an electrode for a secondary battery is produced from an electrode sheet obtained by applying and drying a slurry containing an active material on a strip-like metal foil of aluminum, copper or the like.
  • the application method of the active material can be roughly divided into an intermittent coating method and a continuous coating method.
  • a coated region formed by applying a slurry such as an active material to a strip-shaped metal foil and a non-coated region not applied with the slurry are alternately arranged at predetermined intervals in the winding direction of the metal foil. It is a system to form.
  • the non-forming portion of the active material disposed at a predetermined interval is used as a site for taking out a lead-out tab for electrically connecting to the external terminal.
  • a slurry obtained by mixing or kneading the active material, the conductivity imparting agent, the binder, and the solvent, which are main components, is intermittently applied to one surface of the metal foil (hereinafter referred to as After the intermittent application is performed, the other side of the metal foil is intermittently applied again to apply slurry on both sides of the metal foil.
  • the metal foil with the slurry applied on both sides is pressure-formed by a compression roller. Then, it cut
  • a lithium-containing composite oxide is used as a positive electrode active material of a lithium ion secondary battery, and a large pressure is required when pressure molding an active material layer containing such metal oxide particles as a main component.
  • a positive electrode used for a secondary battery designed to have a high energy density it is necessary to compress the active material layer to a high density, and therefore, in the pressure forming, it is often formed by applying a higher pressure.
  • an electrode used in a secondary battery designed to have a high energy density tends to design a thin metal foil as a current collector.
  • a slurry tailing portion 14 is generated at the boundary between the coated region 11 and the non-coated region 12 when the slurry is intermittently applied to the coating end of the current collector electrode sheet. It's easy to do.
  • the strip-shaped electrode sheet 10 is compressed, processed and formed by a roll press along the winding direction Dx of the electrode roll, if such a tailing portion 14 is present, the tailing portion 14 at the application end has a winding direction (hereinafter referred to as Since the active material layer is only intermittently present in the direction Dy perpendicular to the longitudinal direction Dx, the active material layer is continuously present in the direction Dy perpendicular to the take-up direction Dx. Also, a large linear pressure will be applied.
  • the compression roller is moved up and down frequently, and the compression roller device.
  • the mechanism for adjusting the distance between the compression rolls based on the application end detector and the detection signal is provided, the apparatus configuration becomes complicated, and the maintenance becomes complicated.
  • An object of the present invention is to provide a method of manufacturing a current collector electrode sheet using the compression roller, a current collector electrode sheet, and a battery.
  • the collector electrode sheet of the present invention is A current collector electrode sheet in which an active material layer is formed on both sides in the longitudinal direction of a sheet-like metal foil, wherein the active material layer is a first coated region having a thick coating film, and the first coated region.
  • the thickness of the metal foil in the first application area after compression in the thickness direction of the metal foil is formed by the second application area having a thickness smaller than that of the application area; The thickness is thinner than the thickness of the metal foil in the two coated areas and the non-coated area.
  • the method for producing an electrode sheet of the present invention is The current collector electrode sheet in which the active material is coated on both sides of the sheet metal foil is compressed in the thickness direction of the current collector electrode sheet using a compression roller constituted by a pair of two compression rolls.
  • the current collector electrode sheet includes a coated region coated with a slurry containing the active material, and a non-coated region not coated with the slurry.
  • the application region of the current collector electrode sheet includes a first region, and a second region in which the thickness of the applied film formed is thinner than the first region.
  • the compression roller is placed in the first area. Contact and compress.
  • the compression roller of the present invention is It has a pair of compression rolls which continuously compress the current collector electrode sheet having the active material coated on both sides of the sheet metal foil in the thickness direction, Each of the compression rolls is installed so that its rotation axis is parallel to the lateral direction of the current collector electrode sheet, Each of the compression rolls has an end having circular end faces at both ends in the direction of the rotation axis, and a curved side surface extending between the ends at the both ends.
  • the side surface of the compression roll includes a first range around each of the ends of the compression roll and a second range of a central portion of the compression roll in the rotational axis direction. The distance between the side surfaces in the first range of the pair of compression rolls facing each other is shorter than the distance between the side surfaces in the second range of the pair of compression rolls facing each other.
  • the current collector electrode sheet of the present invention is manufactured using the method of manufacturing a current collector electrode sheet of the present invention.
  • the battery of the present invention is manufactured using the current collector electrode sheet of the present invention.
  • the present invention it is possible to provide a method of manufacturing a current collector electrode sheet, a compression roller, a current collector electrode sheet, and a battery capable of preventing the occurrence of defects in the manufacturing process without increasing the manufacturing cost.
  • FIG. 1 is a partial plan view showing a current collector electrode sheet 10 after double-sided application of an active material in a method of manufacturing a current collector electrode sheet according to an embodiment of the present invention.
  • the electrode sheet 10 has a configuration in which the application region 11 and the non-application region 12 of the slurry such as the active material are intermittently formed in the longitudinal direction Dx on both surfaces of the strip-like metal foil 9.
  • a tailing portion 14 is present at the side electrode portion due to the occurrence of slurry drag. That is, the current collector electrode sheet 10 intermittently applies the slurry on both surfaces of the metal foil 9 to form the tailing portion 14 at the boundary between the coated area 11 and the non-coated area 12.
  • an active material layer is not limited to what is apply
  • the active material layer may be formed by continuous stripe coating, for example, in addition to intermittent coating.
  • the electrode produced from the electrode sheet 10 according to the present embodiment is not particularly limited, but is, for example, an electrode (positive electrode or negative electrode) for a lithium ion battery such as a lithium ion primary battery or a lithium ion secondary battery.
  • the electrode active material layer contains an electrode active material, and as necessary, contains a binder resin, a conductive auxiliary agent, a thickener and the like.
  • a lithium metal composite oxide can be used as the electrode active material.
  • the electrode active material contained in the electrode active material layer according to the present embodiment is appropriately selected according to the application.
  • a positive electrode active material is used, and when manufacturing a negative electrode, a negative electrode active material is used.
  • the positive electrode active material is not particularly limited as long as it is a normal positive electrode active material that can be used for the positive electrode of a lithium ion battery.
  • the olivine-type lithium phosphorus oxide is, for example, at least one member of the group consisting of Mn, Cr, Co, Cu, Ni, V, Mo, Ti, Zn, Al, Ga, Mg, B, Nb, and Fe. It contains elements, lithium, phosphorus and oxygen. These compounds may be obtained by partially replacing some elements with other elements in order to improve their properties.
  • These positive electrode active materials have large capacity in addition to high action potential and large energy density.
  • the positive electrode active material may be used alone or in combination of two or more.
  • the negative electrode active material is not particularly limited as long as it is a common negative electrode active material that can be used for the negative electrode of a lithium ion battery.
  • carbon materials such as natural graphite, artificial graphite, resin charcoal, carbon fiber, activated carbon, hard carbon, soft carbon; lithium metal materials such as lithium metal and lithium alloy; metal materials such as silicon and tin; polyacene, polyacetylene, Conductive polymer materials such as polypyrrole can be mentioned.
  • carbon materials are preferable, and particularly graphitic materials such as natural graphite and artificial graphite are preferable.
  • the negative electrode active material may be used singly or in combination of two or more.
  • the average particle diameter of the electrode active material is preferably 1 ⁇ m or more, more preferably 2 ⁇ m or more, from the viewpoint of suppressing side reactions during charge and discharge to suppress a decrease in charge and discharge efficiency. From the smoothness of the surface, etc., 100 ⁇ m or less is preferable, and 50 ⁇ m or less is more preferable.
  • the average particle diameter means a particle diameter (median diameter: D50) at an integrated value of 50% in a particle size distribution (volume basis) by a laser diffraction scattering method.
  • the content of the electrode active material is preferably 85 parts by mass or more and 99.8 parts by mass or less, based on 100 parts by mass of the entire electrode active material layer.
  • the binder resin contained in the electrode active material layer according to the present embodiment is appropriately selected according to the application.
  • a fluorine-based binder resin that can be dissolved in a solvent, an aqueous binder that can be dispersed in water, or the like can be used.
  • the fluorine-based binder resin is not particularly limited as long as it can be formed into an electrode and has sufficient electrochemical stability, and examples thereof include polyvinylidene fluoride resins and fluororubbers. These fluorine-based binder resins may be used alone or in combination of two or more. Among these, polyvinylidene fluoride resins are preferable.
  • the fluorine-based binder resin can be used, for example, by dissolving it in a solvent such as N-methyl-pyrrolidone (NMP).
  • NMP N-methyl-pyrrolidone
  • the aqueous binder is not particularly limited as long as it can be formed into an electrode and has sufficient electrochemical stability.
  • polytetrafluoroethylene resin, polyacrylic acid resin, styrene butadiene rubber, Polyimide resin etc. are mentioned. These aqueous binders may be used alone or in combination of two or more. Among these, styrene butadiene rubber is preferable.
  • the aqueous binder refers to one that can be dispersed in water to form an aqueous emulsion solution. When using a water-based binder, a thickener can be further used.
  • the thickener is not particularly limited, but, for example, cellulose polymers such as carboxymethylcellulose, methylcellulose and hydroxypropylcellulose and ammonium salts thereof and alkali metal salts; polycarboxylic acids; polyethylene oxide; polyvinylpyrrolidone; sodium polyacrylate and the like And water-soluble polymers such as polyvinyl alcohol; and the like.
  • the content of the binder resin is preferably 0.1 parts by mass or more and 10.0 parts by mass or less, based on 100 parts by mass of the entire electrode active material layer.
  • the balance of the coating property of an electrode slurry, the binding property of a binder, and battery characteristics as the content of binder resin is in the said range is much more excellent.
  • the ratio of an electrode active material becomes large as content of binder resin is below the said upper limit, and since the capacity
  • the conductive aid contained in the electrode active material layer according to the present embodiment is not particularly limited as long as it improves the conductivity of the electrode, but, for example, carbon black, ketjen black, acetylene black, natural graphite, artificial graphite And carbon fibers. These conductive aids may be used alone or in combination of two or more.
  • the content of the conductive additive is preferably 0.1 parts by mass or more and 5.0 parts by mass or less, based on 100 parts by mass of the entire electrode active material layer.
  • the balance of the coating property of an electrode slurry, the binding property of a binder, and the battery characteristic as the content of a conductive support agent is in the said range is much more excellent.
  • the ratio of an electrode active material becomes large as content of a conductive support agent is below the said upper limit, and the capacity
  • the content of the conductive aid to be not less than the above lower limit value, since the conductivity of the electrode becomes better.
  • the content of the electrode active material is preferably 85 parts by mass or more and 99.8 parts by mass or less, based on 100 parts by mass of the whole of the electrode active material layer according to the present embodiment.
  • the content of the binder resin is preferably 0.1 parts by mass or more and 10.0 parts by mass or less.
  • the content of the conductive aid is preferably 0.1 parts by mass or more and 5.0 parts by mass or less.
  • the density of the electrode active material layer is not particularly limited, but when the electrode active material layer is a positive electrode active material layer, for example, it is preferably 2.0 g / cm 3 or more and 4.0 g / cm 3 or less, and 2.4 g / more preferably cm 3 or more 3.8 g / cm 3 or less, and more preferably not more than 2.8 g / cm 3 or more 3.6 g / cm 3.
  • the electrode active material layer is a negative electrode active material layer, for example, it is preferably 1.2 g / cm 3 or more and 2.0 g / cm 3 or less, and 1.3 g / cm 3 or more and 1.9 g / cm 3 The following is more preferable, and 1.4 g / cm 3 or more and 1.8 g / cm 3 or less is more preferable.
  • the density of the electrode active material layer is in the above range, the discharge capacity at the time of use at a high discharge rate is improved, which is preferable.
  • the thickness of the electrode active material layer is not particularly limited, and can be appropriately set according to the desired characteristics. For example, it can be set thick in terms of energy density, and can be set thin in terms of output characteristics.
  • the thickness (thickness on one side) of the electrode active material layer can be appropriately set, for example, in the range of 10 ⁇ m to 250 ⁇ m, preferably 20 ⁇ m to 200 ⁇ m, and more preferably 30 ⁇ m to 150 ⁇ m.
  • the current collector layer (metal foil 9) according to the present embodiment is not particularly limited, but aluminum, stainless steel, nickel, titanium, an alloy of these, or the like can be used as the positive electrode current collector layer.
  • As the shape, foil, flat form, mesh form etc. are mentioned, for example.
  • an aluminum foil can be suitably used.
  • copper, stainless steel, nickel, titanium or an alloy thereof can be used as the negative electrode current collector layer.
  • As the shape, foil, flat form, mesh form is mentioned. Particularly, copper foil can be suitably used.
  • the thickness of the positive electrode current collector layer is not particularly limited, but is, for example, 1 ⁇ m or more and 30 ⁇ m or less.
  • the thickness of the negative electrode current collector layer is not particularly limited, and is, for example, 1 ⁇ m or more and 20 ⁇ m or less.
  • an electrode slurry is prepared.
  • An electrode slurry can be prepared by mixing an electrode active material, and as needed, a binder resin, a conductive aid, and a thickener.
  • the compounding ratio of the electrode active material, the binder resin, and the conductive auxiliary is the same as the content ratio of the electrode active material, the binder resin, and the conductive auxiliary in the electrode active material layer, and thus the description thereof is omitted here.
  • the electrode slurry is obtained by dispersing or dissolving an electrode active material, and as necessary, a binder resin, a conductive auxiliary agent, and a thickener in a solvent.
  • a binder resin for example, after dry-mixing an electrode active material and a conductive support agent, an electrode slurry can be prepared by adding a binder resin and a solvent and wet-mixing.
  • a mixer to be used known ones such as a ball mill and a planetary mixer can be used, and it is not particularly limited.
  • a solvent used for the electrode slurry an organic solvent such as N-methyl-2-pyrrolidone (NMP) or water can be used.
  • NMP N-methyl-2-pyrrolidone
  • a method of applying the electrode slurry on the current collector layer generally known methods can be used.
  • reverse roll method, direct roll method, doctor blade method, knife method, extrusion method, curtain method, gravure method, bar method, dip method, squeeze method and the like can be mentioned.
  • the doctor blade method, the knife method and the extrusion method are preferable in that it is possible to obtain a good surface state of the coating layer according to the physical properties such as viscosity and the like of the electrode slurry and the drying property.
  • the method for drying the electrode slurry applied on the current collector layer is not particularly limited.
  • the electrode slurry is indirectly heated from the current collector layer side or the electrode active material layer side already dried using a heating roll.
  • Method of drying electrode slurry Method of drying electrode slurry using electromagnetic waves such as infrared, far infrared and near infrared heaters; hot air is applied from the current collector layer side or the already dried electrode active material layer side
  • FIG. 12 is a block diagram showing a configuration example of a manufacturing system 1 of the electrode sheet 10 according to the embodiment of the present invention.
  • the manufacturing system 1 includes a slurry application device 20, a compression device 40, and a cutting device 60. Furthermore, a control device that controls each device of the manufacturing system 1 may be provided.
  • FIG. 13 is a block diagram showing an example of a hardware configuration of a computer that implements each device of the electrode sheet manufacturing system according to the embodiment of the present invention.
  • the slurry application device 20, the compression device 40, and the cutting device 60 are each realized by at least one computer 100.
  • the computer 100 includes a central processing unit (CPU) 102, a memory 104, a program 110 for realizing each device loaded in the memory 104, a storage 105 for storing the program 110, an input / output (I / O) 106, and a network connection. Communication interface (I / F) 107.
  • the CPU 102 and each element are connected to one another via a bus 109, and the CPU 102 controls the entire computer 100.
  • the method of connecting the CPUs 102 and the like to each other is not limited to the bus connection.
  • Each function of each device can be realized by the CPU 102 reading the program 110 stored in the storage 105 to the memory 104 and executing it.
  • the slurry application device 20, the compression device 40, and the cutting device 60 are each realized by any combination of the hardware and software of the computer 100. And it is understood by those skilled in the art that there are various modifications in the implementation method and apparatus.
  • the program 110 may be recorded on a recording medium readable by the computer 100.
  • the recording medium is not particularly limited, and various forms can be considered.
  • the program may be loaded from the recording medium into the memory 104 of the computer 100, or may be downloaded to the computer 100 through the network and loaded into the memory 104.
  • a recording medium for recording the program 110 includes a medium that can be used by the non-transitory tangible computer 100, in which the program code readable by the computer 100 is embedded.
  • the computer 100 causes the computer 100 to execute a method of manufacturing the electrode sheet 10 for realizing each device.
  • FIG. 14 is a flowchart showing steps of a method of manufacturing the electrode sheet 10 according to the embodiment of the present invention.
  • the manufacturing method of electrode sheet 10 of an embodiment of the present invention contains an application process (S1), a compression process (S5), and a cutting process (S6).
  • the current collector electrode sheet 10 according to the embodiment of the present invention is manufactured by the manufacturing method shown in FIG.
  • FIG. 2 is a view showing a relationship between a plane and a cross section as viewed from the top surface of the current collector electrode sheet 10 after double-sided application according to the embodiment of the present invention.
  • 2 (a) is a top view of the electrode sheet 10 including a part of the application region 11 of the active material formed on the electrode sheet 10, and
  • FIG. 2 (b) is a line I- of FIG. 2 (a). It is sectional drawing of the electrode sheet 10 in which the application area
  • the end 16 of the region where the thickness of the application region 11 is constant is present on the central portion side in the longitudinal direction Dx of the application region 11 with respect to the electrode portion on the end 13 side of the application region 11.
  • the tail end portion 14 is a trailing portion 14 at the end 16 of the region where the thickness of the application region 11 is constant (t1), and the thickness t2 of the portion of the trailing portion 14 is thinner than t1. That is, the tailing portion 14 is located on the end 13 side of the application area 11, and the thickness t2 of the tailing portion 14 is thinner than the thickness t1 of the central portion in the longitudinal direction Dx of the application area 11. As shown in the figure, the thickness t2 of the tailing portion 14 gradually decreases from the start position of the tailing portion 14 toward the end of the longitudinal direction Dx.
  • FIG. 3 is a schematic view showing an outline of the compression device 40 of the electrode sheet 10 according to the embodiment of the present invention.
  • the electrode sheet 10 has tails 14 formed on the electrode portions on the end 13 side of the active material coated area 11, the non-coated area 12, and the coated area 11 on both sides of the metal foil 9 of FIG.
  • the pair of compression rolls 51 compresses.
  • the electrode sheet 10 is compressed when passing through the gap between the pair of compression rolls 51 and taken up in the longitudinal direction Dx.
  • FIG. 4 is a cross-sectional view of the compression roller 50 taken along line II-II in FIG.
  • the compression roller 50 is configured as a pair of upper and lower two rolls 51, and the upper and lower rolls 51 are formed symmetrically on both ends of the roll main body 52 and the roll main body 52 related to the compression of the active material application region 11. And an end portion 53.
  • the roll main body 52 has a curved barrel shape protruding from the both ends toward the center along the rotation axis A direction of the roll 51.
  • the distance between the side surfaces is continuously from the both end sides in the rotation axis A direction toward the center. short.
  • 5 and 6 show the relationship between the compression roller 50 and the electrode sheet 10 according to the embodiment of the present invention.
  • 5 and 6 are cross-sectional views of the compression roller 50 for II-II in FIG. 3 when viewed from the longitudinal direction of the electrode sheet 10, and in the compression step (S5 in FIG. 14) 11 shows a state in which 11 and the tailing portion 14 are compressed.
  • the electrode sheet 10 of FIG. 1 shall be beforehand cut
  • the compression roller 50 of the present embodiment has a pair of compression rolls 51 that continuously compress the current collector electrode sheet 10 in the thickness direction.
  • Each compression roll 51 is installed such that its rotation axis is parallel to the short direction of the current collector electrode sheet 10.
  • Each compression roll 51 has an end portion 53 having circular end surfaces at both ends in the rotation axis A direction, and a curved side surface extending between the end portions 53 at both ends.
  • the side surface of the compression roll 51 has a first range around each end of the compression roll 51 and a second range of a central portion in the rotation axis A direction of the compression roll 51.
  • the distance between the side faces is shorter.
  • the distance d3 between the central portions is smaller than the distance d4 between the recessed portion forming portions. Because it is short, the central portion (first range) is in contact with the electrode sheet 10, and the recess forming portion (second range) is not in contact with the electrode sheet 10.
  • the coated region 11 of the current collector electrode sheet 10 of the present embodiment includes a first region, and a second region (tail portion 14) in which the thickness of the formed coating film is thinner than the first region. including.
  • the distance (d3 in FIG. 6) between the side surfaces in the first range of the pair of compression rolls 51 is the number of the collector electrode sheet 10. The value is smaller than the value of thickness (t1) in the area 1 (application area 11) and is larger than the value of thickness (t2) of the second area (tail portion 14) of current collector electrode sheet 10 .
  • the distance between the side surfaces in the first range of the pair of compression rolls 51 (d3 in FIG. 6) is the thickness of the non-coated area 12 of the current collector electrode sheet 10, that is, the value of the thickness of the metal foil 9. Greater than.
  • the electrode sheet 10 is inserted between the upper and lower rolls 51 of the compression roller 50, and the roll bodies 52 of the pair of opposing rolls 51 compress the electrode sheet 10 from both sides.
  • the end portions 53 of the opposing roll 51 abuts while compressing the electrode sheet 10 in the thickness direction
  • the electrode sheet 10 can be compressed at a predetermined compression pressure. At this time, the distance between the central portions of the roll main body 52 of the roll 51 is d1, and the distance between the end portions 53 of the roll 51 is d2.
  • the end portions 53 of the rolls 51 are separated by the distance d2, but in order to compress the electrode sheet 10, the opposing rolls 51 are brought close to each other to shorten the distance d2. Finally, the electrode sheet 10 is compressed by bringing the end portions 53 into contact with each other.
  • the compression pressure applied to the electrode sheet 10 is not uniform between the central portion in the direction of the rotation axis A and the portion in the vicinity of the end portion 53, and the central portion of the roll body 52 is distorted. Will occur.
  • the application region 11 of the active material of the electrode sheet 10 passes between the two compression rollers 51 of the compression roller 50 configured as a pair of upper and lower rollers 51, thereby applying the active material application region 11. Is compressed.
  • the length L2 of the short direction Dy of the electrode sheet 10 of the upper and lower two rolls 51 is longer than the length L1 of the short direction Dy of the electrode sheet 10.
  • the distance d3 between the central portions of the roll main body 52 is the thickness of the application area 11 of the active material on both sides of the electrode sheet 10 after compression and the thickness of the metal foil 9. It is set to be smaller than the value.
  • the distance between the end portions 53 is set so that the end portions 53 of the two ends of the upper and lower rolls 51 do not contact in a state where the application region 11 of the active material of the electrode sheet 10 is compressed.
  • the trailing portion 14 is a roll It shows a state of passing between 51.
  • the distance d3 between the central parts of the roll bodies 52 of the opposing pair of rolls 51 is the electrode
  • the roll is made to be larger than the thickness including the tailing portion 14 on both sides of the sheet 10 and / or the thickness of the metal foil 9 corresponding to the non-coated area 12 where the coated area 11 is not formed.
  • the distance h of the height difference between the center plane of the main body 52 and the outer peripheral end of the end 53 is determined.
  • the current collector electrode sheet 10 having the active material coated on both sides of the sheet-like metal foil 9 is a pair of upper and lower two.
  • 14 includes a compression step (S5 in FIG. 14) of compressing the current-collector electrode sheet 10 in the thickness direction using the compression roller 50 configured by the compression roll.
  • the collector electrode sheet 10 includes an application region 11 to which a slurry containing an active material is applied, and a non-application region 12 to which no slurry is applied.
  • the application area 11 of the current collector electrode sheet 10 is a first area (an area of a thickness t1 from the application start position of the application area 11 to the end 16 in the longitudinal direction Dx) and the thickness of the formed coating And a second area (tail portion 14) thinner than the first area.
  • the compression step S5 in FIG. 14
  • the pair of rolls 51 successively compresses the current collector electrode sheet 10 in which the coated areas 11 and the non-coated areas 12 are alternately formed, the first area is compressed.
  • the roller 50 (roll 51) is brought into contact and compressed (FIGS. 5 and 16) (FIG. 6).
  • the compression roller 50 in the compression step (S5 in FIG. 14), when the compression roller 50 successively compresses the current collector electrode sheet 10 in which the coated regions 11 and the non-coated regions 12 are alternately formed, the first region Only the (application area 11) is compressed. Furthermore, in the compression process (S5 in FIG. 14), the compression roller 50 does not compress the area including the second area (tail portion 14) and the non-coated area 12.
  • the upper and lower rolls face each other before the tailing portion 14 of the electrode sheet 10 contacts the roll body 52. Since the end portions 53 of 51 are in contact with each other, the tailing portion 14 of the electrode sheet 10 does not contact the roll main body 52 of the roll 51 and is not pressurized. As described above, according to the present embodiment, since the electrode sheet 10 is not compressed in the tailing portion 14 and the non-coated region 12, a phenomenon in which the active material particles 70 bite into the metal foil 9 largely in the tailing portion 14 is described. It can prevent.
  • the compression step even if the electrode sheet 10 moves in the direction between the rolls 51, that is, the longitudinal direction Dx is set from the coating end side to the coating start end, the coating start end to the coating end side It may be set to be Further, in the compression step, after the compression of the electrode sheet 10 is started, the end portions 53 of the opposing pair of rolls 51 may be kept in contact until the compression of the electrode sheet 10 is completed.
  • FIG. 7 is a cross-sectional view of a current-collector electrode sheet after pressure-molding in the embodiment of the present invention.
  • the current collector electrode sheet 10 of this embodiment is a current collector electrode sheet in which an active material layer is formed on both sides in the longitudinal direction of the sheet-like metal foil 9, and the active material layer has a thickness of the coating film.
  • the first coating area 11 and the second coating area (tail portion 14) having a thinner coating film thickness than the first coating area 11, and are compressed in the thickness direction of the metal foil 9.
  • the thickness of the metal foil 9 in the subsequent first application area 11 is thinner than the thickness of the metal foil 9 in the second application area (tail portion 14) and the non-application area 12.
  • the roll main body 52 of the roll 51 is not in contact with the electrode sheet 10 even after the compression process, and no linear pressure is applied to the tailing portion 14. There is no bite. Therefore, the active material particles do not bite into the metal foil 9 at the tailing portion 14 to make the residual thickness of the foil thin, and it is possible to produce the electrode sheet 10 in which the occurrence of a crack does not occur.
  • the pressure-formed electrode sheet 10 is taken along the winding direction Dx of the foil of the electrode sheet 10, that is, the longitudinal direction 17 as shown in FIG.
  • the electrode sheet 10 is drawn out in one direction (in the figure, toward the left) while being wound up using a roller 90, and continuous by slit blades (not shown) installed on both the upper and lower surfaces of the electrode sheet 10. Cut into pieces.
  • the electrode sheet 10 can be cut into a predetermined size to obtain a plurality of electrodes.
  • the method of cutting out the electrode from the electrode sheet 10 is not particularly limited.
  • the electrode sheet 10 is cut parallel to the longitudinal direction of the electrode sheet 10 (cut along the longitudinal cutting scheduled line 17 in FIG. 1).
  • the method of cutting the electrode sheet 10 is not particularly limited.
  • the electrode sheet 10 can be cut using a blade made of metal or the like.
  • the sheet is broken or cracked at the end of the application region 11 of the active material in the compression process of the current collector electrode sheet 10 with a simple configuration and without increasing the manufacturing cost.
  • FIG. 8 is a schematic view of the cutting surface 80 seen from the top after cutting the electrode sheet 10 in the embodiment of the present invention.
  • the metal foil 9 is cut only in the flowing direction of the blade, and the metal foil 9 is not broken in the transverse direction Dy by the impact of the blade hitting. Therefore, as shown in FIG. 8, the cut surface 80 has a shape in which burrs of the active material layer do not occur.
  • FIG. 9 is a schematic view showing an outline of the compression roller 50 in which the end portions 53 are not formed at both ends of the roll main body 52 of each roll 51, which is a comparative embodiment of the present invention.
  • FIG. 10 shows a current collector electrode sheet after pressure molding using a compression roller 50 in which the end portions 53 are not formed at both ends of the roll main body 52 of each roll 51, which is a comparative embodiment of the present invention. 10 is a cross-sectional view of FIG.
  • the roll main body 52 contacts the tailing portion 14. Since the tailing portion 14 has only an intermittent active material layer in the flowing direction of the foil, that is, the direction Dy perpendicular to the winding direction Dx as shown in FIG. A linear pressure that is locally greater than the application region 11 of the active material in which the active material layer continuously exists in the direction Dy perpendicular to the taking direction Dx is applied. For this reason, as shown in the cross-sectional view of FIG. 10, in the tailing portion 14, the active material particles 70 bite into the metal foil 9, and the remaining thickness of the metal foil 9 becomes extremely thin.
  • the electrode sheet 10 is cut in the longitudinal direction Dx of the metal foil 9 along the planned longitudinal cutting line 17.
  • FIG. 11 is a comparative embodiment of the present invention, in which the pressure-collected current-collector electrode sheet 10 is cut using the compression roller 50 in which the end portions 53 are not formed at both ends of the compression roll main body 52 It is the model which looked at the cutting plane 80 from the upper surface.
  • the remaining thickness of the foil is thinner than the slurry coated area 11 and the non-slurry coated area 12, and the impact when the blade hits causes the blade to flow other than the flowing direction. It will break. For this reason, as shown in a cross-sectional view in FIG. 11, the slurry mixture layer dropped from the tailing portion 14 in the portion where the breakage occurs becomes the burrs 19.
  • burrs 19 When a battery is assembled using an electrode including burrs 19 generated in such a process, the burrs fall off during the assembly process or after the battery is completed, and a short circuit is caused to electrodes of different potentials. Defect rate increases. However, in the present embodiment, as described above, since such burrs 19 do not occur, the defective rate of the battery can be suppressed to a low level.
  • a battery can be manufactured using the electrode sheet 10 manufactured by the manufacturing method of the said embodiment.
  • the method for producing an electrode of the present invention forms an active material layer on a thin current collector such as a metal foil, and after drying, compresses and cuts it (S5 and S6 in FIG. 14) to produce an electrode. It is possible to carry out the assembly of an electrochemical device such as a battery in which the occurrence of burrs of the current collector which may occur is suppressed, and it is possible to provide an electrochemical device such as a battery having good characteristics.
  • FIG. 15 is a schematic view showing an example of the configuration of the battery 150 according to the embodiment of the present invention.
  • the battery which concerns on this embodiment is equipped with the electrode produced from the electrode sheet 10 demonstrated by the said embodiment.
  • the stacked battery 150 includes battery elements in which a positive electrode 121 and a negative electrode 126 are alternately stacked in a plurality of layers with the separator 120 in between, and these battery elements are a flexible film together with an electrolyte (not shown). It is housed in a container consisting of 140.
  • the positive electrode terminal 131 and the negative electrode terminal 136 are electrically connected to the battery element, and a part or all of the positive electrode terminal 131 and the negative electrode terminal 136 are drawn out of the flexible film 140. .
  • the coated portion (positive electrode active material layer 122) and uncoated portion of the positive electrode active material are provided on the front and back of the positive electrode collector layer 123 on the positive electrode 121, and the negative electrode 126 is provided on the front and back of the negative electrode collector layer 128.
  • the coated portion of the negative electrode active material (negative electrode active material layer 127) and the uncoated portion are provided.
  • the uncoated portion of the positive electrode active material in the positive electrode current collector layer 123 is used as the positive electrode tab 130 for connecting to the positive electrode terminal 131, and the uncoated portion of the negative electrode active material in the negative electrode current collector layer 128 is connected to the negative electrode terminal 136.
  • the negative electrode tab 125 of FIG. The positive electrode tabs 130 are assembled on the positive electrode terminal 131, and are connected together by ultrasonic welding etc. together with the positive electrode terminal 131, and the negative electrode tabs 125 are assembled together on the negative electrode terminal 136, and are connected together by ultrasonic welding etc. together with the negative electrode terminal 136. Be done.
  • one end of the positive electrode terminal 131 is drawn out of the flexible film 140, and one end of the negative electrode terminal 136 is also drawn out of the flexible film 140.
  • An insulating member can be formed as necessary at the boundary 124 between the coated part (coated area 11) (positive electrode active material layer 122) of the positive electrode active material and the non-coated part (non-coated area 12).
  • the member can be formed not only at the boundary 124 but also near the boundary between the positive electrode tab 130 and the positive electrode active material.
  • an insulating member can be formed on the boundary portion 129 between the coated portion (negative electrode active material layer 127) and the non-coated portion of the negative electrode active material as required, and the boundary between both the negative electrode tab 125 and the negative electrode active material It can be formed near the part.
  • the outer dimensions of the negative electrode active material layer 127 are larger than the outer dimensions of the positive electrode active material layer 122 and smaller than the outer dimensions of the separator 120.
  • Non-aqueous electrolyte containing lithium salt The non-aqueous electrolytic solution containing a lithium salt used in the present embodiment can be appropriately selected from known ones depending on the type of electrode active material, the use of the lithium ion battery, and the like.
  • lithium salt for example, LiClO 4, LiBF 6, LiPF 6, LiCF 3 SO 3, LiCF 3 CO 2, LiAsF 6, LiSbF 6, LiB 10 Cl 10, LiAlCl 4, LiCl, LiBr, LiB Examples include (C 2 H 5 ) 4 , CF 3 SO 3 Li, CH 3 SO 3 Li, LiC 4 F 9 SO 3 , Li (CF 3 SO 2 ) 2 N, and lower fatty acid carboxylate lithium.
  • the solvent for dissolving the lithium salt is not particularly limited as long as it is generally used as a liquid for dissolving the electrolyte, and ethylene carbonate (EC), propylene carbonate (PC), butylene carbonate (BC), dimethyl carbonate (DMC), ethyl methyl carbonate (EMC), diethyl carbonate (DEC), methyl ethyl carbonate (MEC), carbonates such as vinylene carbonate (VC); lactones such as ⁇ -butyrolactone and ⁇ -valerolactone; trimethoxymethane Ethers such as 1,2-dimethoxyethane, diethyl ether, tetrahydrofuran, 2-methyltetrahydrofuran, etc.
  • EC ethylene carbonate
  • PC propylene carbonate
  • BC butylene carbonate
  • DMC dimethyl carbonate
  • EMC ethyl methyl carbonate
  • EMC ethyl methyl carbonate
  • DEC diethyl carbon
  • Sulfoxides such as dimethylsulfoxide, etc. 1,3-Dioxolane, 4-methyl-1,3-dioxola
  • Nitrogenous solvents such as acetonitrile, nitromethane, formamide and dimethylformamide; methyl formate, methyl acetate, ethyl acetate, butyl acetate, methyl propionate, ethyl propionate and the like; organic acid esters such as phosphoric acid triester And diglymes; triglymes; sulfolanes such as sulfolane and methyl sulfolane; oxazolidinones such as 3-methyl-2-oxazolidinone; and sultones such as 1,3-propane sultone, 1,4-butane sultone and naphtha sultone. . These may be used singly or in combination of two or more.
  • a well-known member can be used for a container in this embodiment, and it is preferable to use the flexible film 140 from a viewpoint of weight reduction of a battery.
  • the flexible film 140 can use what provided the resin layer in front and back of the metal layer used as a base material.
  • the metal layer can be selected to have a barrier property to prevent leakage of the electrolytic solution and entry of moisture from the outside, and aluminum, stainless steel, etc. can be used.
  • a heat-sealable resin layer such as modified polyolefin is provided on at least one surface of the metal layer, and the heat-sealable resin layers of the flexible film 140 are opposed to each other through the battery element to make the battery element
  • the sheath is formed by heat-sealing the periphery of the part to be stored.
  • a resin layer such as a nylon film or a polyester film can be provided on the surface of the exterior body opposite to the surface on which the heat-fusible resin layer is formed.
  • the positive electrode terminal 131 can be made of aluminum or an aluminum alloy
  • the negative electrode terminal 136 can be made of copper or a copper alloy, or those plated with nickel.
  • Each terminal is drawn to the outside of the container, but a heat fusible resin can be provided in advance in a portion located at a portion of the respective terminal where the periphery of the package is heat welded.
  • Insulating member In the case of forming the insulating member at the boundary portions 124 and 129 of the coated portion and the non-coated portion of the active material, it is possible to use polyimide, glass fiber, polyester, polypropylene or those containing these in the structure. Heat can be applied to these members to weld them to the boundaries 124, 129, or a gel-like resin can be applied to the boundaries 124, 129 and dried to form an insulating member.
  • the separator 120 preferably includes a resin layer containing a heat resistant resin as a main component.
  • the resin layer is formed of a heat resistant resin which is a main component.
  • the "main component” means that the proportion in the resin layer is 50% by mass or more, preferably 70% by mass or more, more preferably 90% by mass or more, and 100% by mass. It means that you may.
  • the resin layer constituting the separator 120 according to the present embodiment may be a single layer or two or more layers.
  • Examples of the heat resistant resin forming the above resin layer include polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, poly-m-phenylene terephthalate, poly-p-phenylene isophthalate, polycarbonate, polyester carbonate, aliphatic polyamide, all Aromatic polyamide, semiaromatic polyamide, wholly aromatic polyester, polyphenylene sulfide, polyparaphenylene benzobisoxazole, polyimide, polyarylate, polyetherimide, polyamideimide, polyacetal, polyetheretherketone, polysulfone, polyethersulfone, One or more selected from fluorine resins, polyether nitriles, modified polyphenylene ethers and the like can be mentioned.
  • polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, aliphatic polyamide, wholly aromatic polyamide, semiaromatic polyamide and all aromatic from the viewpoint of excellent balance of heat resistance, mechanical strength, stretchability, price and the like.
  • Family of polyesters one or more selected from polyethylene terephthalates, polybutylene terephthalates, aliphatic polyamides, wholly aromatic polyamides and semiaromatic polyamides are more preferred, and polyethylene terephthalates are preferred.
  • One or more selected from wholly aromatic polyamides are more preferable, and polyethylene terephthalate is more preferable.
  • the resin layer which comprises the separator 120 which concerns on this embodiment is a porous resin layer.
  • the fine pores of the porous resin layer can be blocked to block the flow of the current, thereby avoiding the thermal runaway of the battery. be able to.
  • the porosity of the porous resin layer is preferably 20% to 80%, more preferably 30% to 70%, and still more preferably 40% to 60%. Is particularly preferred.
  • ⁇ porosity (%)
  • Ws basis weight (g / m 2 )
  • ds true density (g / cm 3 )
  • t film thickness ( ⁇ m).
  • the planar shape of the separator 120 according to the present embodiment is not particularly limited, and can be appropriately selected according to the shapes of the electrode and the current collector, and can be, for example, rectangular.
  • the thickness of the separator 120 according to the present embodiment is preferably 5 ⁇ m or more and 50 ⁇ m or less from the viewpoint of the balance between mechanical strength and lithium ion conductivity.
  • a battery can be manufactured using the electrode sheet 10 manufactured by the manufacturing method of the above embodiment.
  • an active material layer is formed on a thin current collector such as a metal foil, and after drying, it is compressed and cut (S5 and S6 in FIG. 14) to produce an electrode.
  • Example 1 As a positive electrode active material, 50% cumulative diameter determined from the particle size distribution measurement value (D50) is 8 [mu] m, also 90% cumulative diameter (D90) is 12 ⁇ m, Li (Ni 0.6 Co 0.2 Mn 0.2) N-methyl pyrrolidone is added to a mixture of 94.8% by weight of O 2 , 2.5% by weight of a graphite material as a conductive aid, and 2.7% by weight of polyvinylidene fluoride as a binder and further mixed. The positive electrode slurry was prepared.
  • the coated area 11 and the non-coated area 12 are alternately formed in the winding direction of the foil on the 12 ⁇ m thick aluminum foil current collector foil surface moving on the backup roller.
  • the slurry containing the active material and the like applied to the aluminum foil was dried and solidified by a drying furnace which was intermittently applied.
  • each roll 51 has a concave portion formed by polishing from a cylindrical shape having circular end surfaces with a radius of 250 mm at both ends in the rotation axis direction and side surfaces (curved surfaces) with a length of 700 mm in the rotation axis direction.
  • a barrel-shaped roll main body 52 was produced.
  • the length L2 (FIG. 5) of the side surface of each roll 51 in the direction of the rotation axis A is longer than the length L1 (FIG. 5) of the electrode sheet 10 in the short side direction Dy.
  • the side of each roll 51 includes a non-polished area that is not polished and a polished area that is polished.
  • the non-abrasive area is included in the surface of the side surface in a range extending 45 mm from the end face side on both sides toward the center in the rotation axis A direction, and corresponds to the end 53.
  • the side surface (corresponding to the roll main body 52) of each roll 51 is polished.
  • the polishing amount is indicated by the depth toward the rotation axis A from the side surface.
  • the amount of polishing in the polishing region changes in accordance with the distance from the end of the non-polishing region on the side surface of the roll 51 toward the center in the rotation axis A direction.
  • the polishing amount monotonously decreases from the end of the non-polishing region on the side surface of the roll 51 toward the center in the rotation axis direction. That is, the amount of polishing is larger near the end (end portion 53) of the non-polishing region of the roll 51.
  • the central portion in the rotation axis A direction of the roll 51 has a polishing amount of 20.0 ⁇ m in depth, and in the range extending from the end of the non-polished area on the side of the roll 51 inward in the rotational axis A direction 4 mm each The depth is 9.6 ⁇ m deeper than the central portion of the roll 51.
  • the distance d3 between the center portions when the end portions 53 of the pair of upper and lower rolls 51 of the compression roller 50 abut is adjusted to be 130 ⁇ m. Then, in the compression step, the electrode sheet 10 having a width of 595 mm in the width direction, to which the slurry is intermittently applied using the compression device 40, passes between the opposing rolls 51 adjusted as described above. The electrode sheet 10 was pressed and compressed by moving it on the backup roller 90 at a rotational speed of 60 m / min.
  • the compression pressure was adjusted so that the linear pressure on the application area (application area 11) of the active material slurry was 1.8 t / cm, and the compression pressure of the upper and lower compression rolls 51 averaged 19 MPa. .
  • a part of the obtained electrode sheet 10 was extracted, the thickness of the single-sided active material layer (application region 11) was 62.6 ⁇ m, and the thickness of the entire sheet was 137.2 ⁇ m.
  • the maximum thickness of the tailing portion 14 may be regarded as the maximum particle diameter of the active material particles, and the maximum particle diameter obtained by measuring the active material particles used at this time by the microtrack method was 24 ⁇ m. From this, the maximum thickness of the electrode sheet 10 in the tailing portion 14 is determined to be 60 ⁇ m.
  • the roll-bending displacement becomes 10 ⁇ m per pair of compression rolls, so when the end portions 53 of both ends of the upper and lower compression rolls 51 abut, The distance d3 between the central portions of the pair of rolls 51 is 60 ⁇ m. Therefore, even if the region (second region) of the tailing portion 14 of the electrode sheet 10 passes between the compression rolls 51, the electrode sheet 10 and the upper and lower compression rolls 51 do not contact in the region of the tailing portion 14 It is configured.
  • the electrode sheet 10 compressed in the compression step (S5 in FIG. 14) is cut using the cutting device 50 including the shear blade at the upper portion and the gang blade at the lower portion.
  • the blade was inserted between the blades, installed so that the take-up tension was constant, and was cut by moving on the backup roller 90 at a constant speed. A part of the obtained cut sheet was extracted, and the presence or absence of a burr from the tailing portion 14 after the cutting step (S6 in FIG. 14) was confirmed.
  • a compression roller 50 which has been polished so that the amount of polishing monotonously decreases toward the central portion of the roll 51 without leaving non-polished regions at both end portions 53 of the respective rolls 51.
  • An electrode sheet 10 was produced using the same method as in Example 1 except for the above, and the presence or absence of burrs after cutting was confirmed.
  • Example 1 and Comparative Example 1 ten specimens were observed for each of the presence or absence of cracks after compression of the tail portion 14 and the occurrence of burrs after cutting, and the results are shown in Table 1. Ten samples were observed, and the case where the burr generation was 3 or less was regarded as a small generation amount, and the case where the burr generation was 4 or more samples as a large generation amount.
  • the thickness of the metal foil in the first application area after compression in the thickness direction of the metal foil is formed by the second application area having a thickness smaller than that of the application area;
  • the active material layer is intermittently formed on the both surfaces in the longitudinal direction of the metal foil, and the second application region is intermittently in the longitudinal direction of the metal foil.
  • a current collector electrode sheet which is formed at the longitudinal direction end of the formed application region. 3.
  • the current collector electrode sheet in which the active material is coated on both sides of the sheet metal foil is compressed in the thickness direction of the current collector electrode sheet using a compression roller constituted by a pair of two compression rolls. Including a compression step, The current collector electrode sheet includes a coated region coated with a slurry containing the active material, and a non-coated region not coated with the slurry.
  • the application region of the current collector electrode sheet includes a first region, and a second region in which the thickness of the applied film formed is thinner than the first region.
  • the compression step when the pair of compression rolls continuously compress the current collector electrode sheet in which the coated area and the non-coated area are alternately formed, the compression roll is placed in the first area.
  • the manufacturing method of a collector electrode sheet which makes it contact and compresses. 4. 3.
  • the method of producing a current collector electrode sheet according to In the compression step when the pair of compression rolls sequentially compress the current collector electrode sheet in which the coated area and the non-coated area are alternately formed, the second area and the non-coated area A method of producing a current collector electrode sheet, wherein the region containing the is not compressed. 5. 3. Or 4.
  • each of the compression rolls has a pair of compression rolls which continuously compress the current collector electrode sheet having the active material coated on both sides of the sheet metal foil in the thickness direction,
  • Each of the compression rolls is installed so that its rotation axis is parallel to the lateral direction of the current collector electrode sheet,
  • Each of the compression rolls has an end having circular end faces at both ends in the direction of the rotation axis, and a curved side surface extending between the ends at the both ends.
  • the side surface of the compression roll includes a first range around each of the ends of the compression roll and a second range of a central portion of the compression roll in the rotational axis direction.
  • a compression roller wherein a distance between the side surfaces in the second range of the pair of opposing compression rolls is shorter than a distance between the side surfaces in the first range of the pair of opposing opposing compression rolls.
  • the application region of the current collector electrode sheet to which the active material is applied includes a first region and a second region in which the thickness of the formed coating film is thinner than the first region.
  • the distance between the side surfaces in the first range of the pair of compression rolls when the ends of the opposing pair of compression rolls abut is the first area of the current collector electrode sheet.
  • a compression roller which is smaller than the thickness value of and larger than the thickness value of the second region of the current collector electrode sheet.
  • each of the compression rolls is installed so that its rotation axis is parallel to the short direction of the current collector electrode sheet,
  • Each of the compression rolls has an end having circular end faces at both ends in the direction of the rotation axis, and a curved side surface extending between the ends at the both ends.
  • the side surface of the compression roll includes a first range around each of the ends of the compression roll and a second range of a central portion of the compression roll in the rotational axis direction.
  • a collector electrode sheet wherein the distance between the side surfaces in the first range of the pair of compression rolls facing each other is shorter than the distance between the side surfaces in the second range of the pair of compression rolls facing each other Production method.
  • the application region of the current collector electrode sheet to which the slurry is applied includes a first region and a second region in which the thickness of the formed coating film is thinner than the first region,
  • Each of the compression rolls has an end having circular end faces at both ends in the direction of the rotation axis, and a curved side surface extending between the ends at the both ends.
  • the side surface of the compression roll includes a first range around each of the ends of the compression roll and a second range of a central portion of the compression roll in the rotational axis direction.
  • Each of the compression rolls has an end having circular end faces at both ends in the direction of the rotation axis, and a curved side surface extending between the ends at the both ends.
  • the side surface of the compression roll includes a first range around each of the ends of the compression roll and a second range of a central portion of the compression roll in the rotational axis direction.
  • the pair of opposing compression rolls are continuously coupled to each other from the boundary with the first range toward the central portion in the rotation axis direction of the compression rolls.

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  • Chemical Kinetics & Catalysis (AREA)
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  • General Chemical & Material Sciences (AREA)
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Abstract

L'invention concerne un rouleau de compression (50) comprenant une paire de rouleaux (51) qui compriment en continu, dans une direction d'épaisseur, une feuille d'électrode de collecteur de courant dans laquelle un matériau actif a été appliqué sur les deux surfaces d'une feuille métallique en forme de feuille (9). Les rouleaux (51) sont disposés de telle sorte que leurs axes de rotation sont parallèles à la direction de dimension plus courte de la feuille d'électrode. Chaque rouleau (51) comprend : des parties d'extrémité (53) ayant des surfaces d'extrémité circulaires aux deux extrémités dans la direction de l'axe de rotation ; et une surface latérale (corps de rouleau) entre les parties d'extrémité (53). Pendant la compression de la feuille d'électrode, la surface latérale comprend : une première plage à proximité des deux extrémités des rouleaux (51) ; et une seconde plage dans la partie centrale dans la direction d'axe de rotation des rouleaux (51). La distance entre les surfaces latérales dans la première plage de la paire opposée de rouleaux (51) est plus courte que la distance entre les surfaces latérales dans la seconde plage de la paire opposée de rouleaux (51).
PCT/JP2018/035351 2017-10-25 2018-09-25 Procédé de fabrication de feuille d'électrode de collecteur de courant, rouleau de compression, feuille d'électrode de collecteur de courant et batterie WO2019082575A1 (fr)

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WO2020116080A1 (fr) * 2018-12-03 2020-06-11 株式会社エンビジョンＡｅｓｃエナジーデバイス Feuille d'électrode de collecteur et batterie
WO2021145061A1 (fr) * 2020-01-17 2021-07-22 パナソニックＩｐマネジメント株式会社 Procédé de revêtement et dispositif de revêtement

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