WO2021085767A1 - Composition d'électrode de supercondensateur permettant d'améliorer la densité d'électrode, procédé de fabrication d'électrode de supercondensateur l'utilisant, et supercondensateur fabriqué à l'aide du procédé de fabrication - Google Patents

Composition d'électrode de supercondensateur permettant d'améliorer la densité d'électrode, procédé de fabrication d'électrode de supercondensateur l'utilisant, et supercondensateur fabriqué à l'aide du procédé de fabrication Download PDF

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WO2021085767A1
WO2021085767A1 PCT/KR2020/005542 KR2020005542W WO2021085767A1 WO 2021085767 A1 WO2021085767 A1 WO 2021085767A1 KR 2020005542 W KR2020005542 W KR 2020005542W WO 2021085767 A1 WO2021085767 A1 WO 2021085767A1
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electrode
parts
weight
supercapacitor
active material
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PCT/KR2020/005542
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English (en)
Korean (ko)
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노광철
채지수
전수한
임병일
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코칩 주식회사
한국세라믹기술원
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Publication of WO2021085767A1 publication Critical patent/WO2021085767A1/fr

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
    • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
    • H01G11/22—Electrodes
    • H01G11/30—Electrodes characterised by their material
    • H01G11/32—Carbon-based
    • H01G11/34—Carbon-based characterised by carbonisation or activation of carbon
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B32/00—Carbon; Compounds thereof
    • C01B32/30—Active carbon
    • C01B32/312—Preparation
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
    • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
    • H01G11/22—Electrodes
    • H01G11/30—Electrodes characterised by their material
    • H01G11/32—Carbon-based
    • H01G11/36—Nanostructures, e.g. nanofibres, nanotubes or fullerenes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
    • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
    • H01G11/84—Processes for the manufacture of hybrid or EDL capacitors, or components thereof
    • H01G11/86—Processes for the manufacture of hybrid or EDL capacitors, or components thereof specially adapted for electrodes
    • 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
    • Y02E60/13—Energy storage using capacitors

Definitions

  • the present invention relates to a composition for a supercapacitor electrode, a method of manufacturing a supercapacitor electrode, and a supercapacitor, and in more detail, it is possible to improve moldability, improve durability of the electrode, and improve electrode density. It relates to a composition for a supercapacitor electrode, a method of manufacturing a supercapacitor electrode, and a supercapacitor.
  • a general supercapacitor is composed of a porous electrode, a current collector, a separator, and an electrolyte.
  • Supercapacitors are also referred to as Electric Double Layer Capacitors (EDLC) and Ultra-capacitors, and this is a pair of charge layers with different codes at the interface between the electrode and the conductor and the electrolyte impregnated therein ( This is a device that does not require maintenance due to very low deterioration due to repetition of charging/discharging operation by using the generated electric double layer). Accordingly, supercapacitors are mainly used in the form of backing up ICs (integrated circuits) of various electric and electronic devices, and their use has been expanded in recent years and has been widely applied to toys, solar energy storage, and HEV (hybrid electric vehicle) power supplies. have.
  • ICs integrated circuits
  • Such supercapacitors generally include two electrodes, a positive electrode and a negative electrode impregnated with an electrolyte, and a separator made of a porous material for insulating and short-circuit prevention, and an electrolyte that is interposed between these two electrodes to enable only ion conduction. It has a unit cell composed of a gasket to prevent leakage of the body, insulation and short-circuit, and a metal cap as a conductor that wraps them. And it is completed by stacking one or more unit cells (usually 2 to 6 in the case of coin type) configured as above in series and combining the two terminals of the positive and negative electrodes.
  • the performance of a supercapacitor is determined by the electrode active material, electrolyte, and the like, and in particular, the main performance such as storage capacity is mostly determined by the electrode active material.
  • Activated carbon is mainly used as such an electrode active material, and the reserve capacity is known to be up to 19.3 F/cc based on the electrode of a commercial product.
  • activated carbon used as an electrode active material for supercapacitors is activated carbon with a high specific surface area of 1500 m 2 /g or more.
  • the problem to be solved by the present invention is to provide a composition for a supercapacitor electrode, a method of manufacturing a supercapacitor electrode, and a supercapacitor capable of improving moldability, improving durability of the electrode, and improving electrode density. have.
  • an electrode active material 0.1 to 20 parts by weight of a conductive material based on 100 parts by weight of the electrode active material, 1 to 20 parts by weight of a fluorine-containing binder based on 100 parts by weight of the electrode active material, and 0.01 to 2 parts by weight of an additive based on 100 parts by weight of the electrode active material
  • a composition for a supercapacitor electrode comprising 100 to 300 parts by weight of a dispersion medium based on 100 parts by weight of the electrode active material, and the additive comprises 2-(dimethylamino)ethyl methacrylate.
  • composition for the supercapacitor electrode further comprises 0.01 to 2 parts by weight of 2-[(3-acrylamidopropyl dimethylammonio acetate (CBAA; 2-[(3-acrylamidopropyl) dimethylammonio] acetate) based on 100 parts by weight of the electrode active material.
  • CBAA 2-[(3-acrylamidopropyl) dimethylammonio] acetate
  • the fluorine-containing binder may include polytetrafluoroethylene (PTFE).
  • PTFE polytetrafluoroethylene
  • the electrode active material is composed of activated carbon with a specific surface area of 1500 to 3000 m 2 /g, graphene with a specific surface area of 100 to 1000 m 2 /g, carbon nanotubes (CNTs), and carbon nanofibers. It may contain one or more materials selected from the group.
  • the present invention provides an electrode active material, 0.1 to 20 parts by weight of a conductive material based on 100 parts by weight of the electrode active material, 1 to 20 parts by weight of a fluorine-containing binder based on 100 parts by weight of the electrode active material, and 100 parts by weight of the electrode active material.
  • Preparing a composition for a supercapacitor electrode by mixing 0.01 to 2 parts by weight of an additive and 100 to 300 parts by weight of a dispersion medium with respect to 100 parts by weight of the electrode active material, and forming an electrode by pressing the composition for a supercapacitor electrode, or Coating the composition for a supercapacitor electrode on a metal foil or a current collector to form an electrode, or forming a sheet by pushing the composition for a supercapacitor electrode with a roller and attaching it to a metal foil or a current collector to form an electrode, and the shape of the electrode
  • a method of manufacturing a supercapacitor electrode comprising the step of forming a supercapacitor electrode by drying the resultant product, wherein the additive comprises 2-(dimethylamino)ethyl methacrylate.
  • composition for the supercapacitor electrode further comprises 0.01 to 2 parts by weight of 2-[(3-acrylamidopropyl dimethylammonio acetate (CBAA; 2-[(3-acrylamidopropyl) dimethylammonio] acetate) based on 100 parts by weight of the electrode active material.
  • CBAA 2-[(3-acrylamidopropyl) dimethylammonio] acetate
  • the fluorine-containing binder may include polytetrafluoroethylene (PTFE).
  • PTFE polytetrafluoroethylene
  • the electrode active material is composed of activated carbon with a specific surface area of 1500 to 3000 m 2 /g, graphene with a specific surface area of 100 to 1000 m 2 /g, carbon nanotubes (CNTs), and carbon nanofibers. It may contain one or more materials selected from the group.
  • the present invention the anode made of a supercapacitor electrode manufactured by the above method; A cathode made of a supercapacitor electrode manufactured by the above method; A separator disposed between the anode and the cathode and configured to prevent a short circuit between the anode and the cathode; A metal cap in which the anode, the separator, and the cathode are disposed and an electrolyte is injected; And a gasket for sealing the metal cap.
  • the present invention provides a first separator for preventing a short circuit, an anode comprising a supercapacitor electrode manufactured by the above method, a second separator for preventing a short circuit between the anode and the cathode, and a super capacitor manufactured by the above method.
  • a metal cap accommodating the winding element;
  • a sealing rubber for sealing the metal cap, wherein the winding element is impregnated with an electrolyte in which a lithium salt is dissolved.
  • the moldability can be improved, the durability of the electrode can be improved, and the electrode density can be improved.
  • the contact with other raw materials is good, resistance is low, density increase and durability are improved, so that excellent cell efficiency can be exhibited.
  • a supercapacitor manufactured using the composition for a supercapacitor electrode of the present invention has a high electrode density, exhibits high capacity characteristics as the energy density increases, and exhibits excellent specific capacity characteristics.
  • FIG. 1 is a cross-sectional view of a coin-type supercapacitor according to an example.
  • FIGS. 2 to 5 are views showing a wound-type supercapacitor according to an example.
  • Example 6 is a diagram showing electrochemical analysis results of a supercapacitor manufactured according to Example 1 and a supercapacitor manufactured according to a comparative example.
  • the composition for a supercapacitor electrode includes an electrode active material; 0.1 to 20 parts by weight of a conductive material based on 100 parts by weight of the electrode active material, 1 to 20 parts by weight of a fluorine-containing binder based on 100 parts by weight of the electrode active material, and 0.01 to 2 parts by weight of an additive based on 100 parts by weight of the electrode active material And 100 to 300 parts by weight of a dispersion medium based on 100 parts by weight of the electrode active material, and the additive includes 2-(dimethylamino)ethyl methacrylate.
  • a method of manufacturing a supercapacitor electrode according to a preferred embodiment of the present invention includes an electrode active material, 0.1 to 20 parts by weight of a conductive material based on 100 parts by weight of the electrode active material, and 1 to 20 parts by weight of a fluorine-containing binder based on 100 parts by weight of the electrode active material.
  • preparing a composition for a supercapacitor electrode by mixing 0.01 to 2 parts by weight of an additive with respect to 100 parts by weight of the electrode active material and 100 to 300 parts by weight of a dispersion medium with respect to 100 parts by weight of the electrode active material, and the composition for a supercapacitor electrode Press-press to form an electrode, or coat the composition for a supercapacitor electrode on a metal foil or a current collector to form an electrode, or push the composition for a supercapacitor electrode with a roller to form a sheet, and then attach it to a metal foil or a current collector. And forming a supercapacitor electrode by attaching to form an electrode and drying the resulting product in the form of an electrode, wherein the additive includes 2-(dimethylamino)ethyl methacrylate. .
  • a supercapacitor includes an anode made of a supercapacitor electrode manufactured by the above method; A cathode made of a supercapacitor electrode manufactured by the above method; A separator disposed between the anode and the cathode and configured to prevent a short circuit between the anode and the cathode; A metal cap in which the anode, the separator, and the cathode are disposed and an electrolyte is injected; And a gasket for sealing the metal cap.
  • a supercapacitor includes a first separator for preventing a short circuit, an anode made of a supercapacitor electrode manufactured by the above method, a second separator for preventing a short circuit between the anode and the cathode, and , A winding element in which a cathode made of a supercapacitor electrode manufactured by the above method is sequentially stacked to form a coiled roll shape; A first lead wire connected to the negative electrode; A second lead wire connected to the positive electrode; A metal cap accommodating the winding element; And a sealing rubber for sealing the metal cap, and the winding element is impregnated in an electrolyte solution in which a lithium salt is dissolved.
  • the composition for a supercapacitor electrode includes an electrode active material; 0.1 to 20 parts by weight of a conductive material based on 100 parts by weight of the electrode active material, 1 to 20 parts by weight of a fluorine-containing binder based on 100 parts by weight of the electrode active material, and 0.01 to 2 parts by weight of an additive based on 100 parts by weight of the electrode active material And 100 to 300 parts by weight of a dispersion medium based on 100 parts by weight of the electrode active material, and the additive includes 2-(dimethylamino)ethyl methacrylate.
  • composition for the supercapacitor electrode further comprises 0.01 to 2 parts by weight of 2-[(3-acrylamidopropyl dimethylammonio acetate (CBAA; 2-[(3-acrylamidopropyl) dimethylammonio] acetate) based on 100 parts by weight of the electrode active material.
  • CBAA 2-[(3-acrylamidopropyl) dimethylammonio] acetate
  • the fluorine-containing binder may include polytetrafluoroethylene (PTFE).
  • PTFE polytetrafluoroethylene
  • the electrode active material is composed of activated carbon with a specific surface area of 1500 to 3000 m 2 /g, graphene with a specific surface area of 100 to 1000 m 2 /g, carbon nanotubes (CNTs), and carbon nanofibers. It may contain one or more materials selected from the group.
  • a method of manufacturing a supercapacitor electrode according to a preferred embodiment of the present invention includes an electrode active material, 0.1 to 20 parts by weight of a conductive material based on 100 parts by weight of the electrode active material, and 1 to 20 parts by weight of a fluorine-containing binder based on 100 parts by weight of the electrode active material.
  • preparing a composition for a supercapacitor electrode by mixing 0.01 to 2 parts by weight of an additive with respect to 100 parts by weight of the electrode active material and 100 to 300 parts by weight of a dispersion medium with respect to 100 parts by weight of the electrode active material, and the composition for a supercapacitor electrode Press-press to form an electrode, or coat the composition for a supercapacitor electrode on a metal foil or a current collector to form an electrode, or push the composition for a supercapacitor electrode with a roller to form a sheet, and then attach it to a metal foil or a current collector. And forming a supercapacitor electrode by attaching to form an electrode and drying the resulting product in the form of an electrode, wherein the additive includes 2-(dimethylamino)ethyl methacrylate. .
  • the composition for the supercapacitor electrode further comprises 0.01 to 2 parts by weight of 2-[(3-acrylamidopropyl dimethylammonio acetate (CBAA; 2-[(3-acrylamidopropyl) dimethylammonio] acetate) based on 100 parts by weight of the electrode active material.
  • CBAA 2-[(3-acrylamidopropyl dimethylammonio acetate)
  • the 2-[(3-acrylamidopropyl dimethylammonio acetate) enhances the binding power to the current collector, improves the impregnation property of the electrolyte, and enables the improvement of electrode density.
  • the fluorine-containing binder may include polytetrafluoroethylene (PTFE).
  • PTFE polytetrafluoroethylene
  • the electrode active material is composed of activated carbon with a specific surface area of 1500 to 3000 m 2 /g, graphene with a specific surface area of 100 to 1000 m 2 /g, carbon nanotubes (CNTs), and carbon nanofibers. It may contain one or more materials selected from the group.
  • a supercapacitor includes an anode made of a supercapacitor electrode manufactured by the above method; A cathode made of a supercapacitor electrode manufactured by the above method; A separator disposed between the anode and the cathode and configured to prevent a short circuit between the anode and the cathode; A metal cap in which the anode, the separator, and the cathode are disposed and an electrolyte is injected; And a gasket for sealing the metal cap.
  • a supercapacitor includes a first separator for preventing a short circuit, an anode made of a supercapacitor electrode manufactured by the above method, a second separator for preventing a short circuit between the anode and the cathode, and , A winding element in which a cathode made of a supercapacitor electrode manufactured by the above method is sequentially stacked to form a coiled roll shape; A first lead wire connected to the negative electrode; A second lead wire connected to the positive electrode; A metal cap accommodating the winding element; And a sealing rubber for sealing the metal cap, and the winding element is impregnated in an electrolyte solution in which a lithium salt is dissolved.
  • the inventors of the present invention have studied a composition for a supercapacitor electrode that can exhibit excellent cell efficiency by improving contact with other raw materials, low resistance, increased electrode density, and improved durability by using a small amount of additives together with a binder. .
  • the composition for a supercapacitor electrode includes an electrode active material; 0.1 to 20 parts by weight of a conductive material based on 100 parts by weight of the electrode active material, 1 to 20 parts by weight of a fluorine-containing binder based on 100 parts by weight of the electrode active material, and 0.01 to 2 parts by weight of an additive based on 100 parts by weight of the electrode active material And 100 to 300 parts by weight of a dispersion medium based on 100 parts by weight of the electrode active material, and the additive includes 2-(dimethylamino)ethyl methacrylate.
  • the electrode active material is composed of activated carbon with a specific surface area of 1500 to 3000 m 2 /g, graphene with a specific surface area of 100 to 1000 m 2 /g, carbon nanotubes (CNTs), and carbon nanofibers. It may contain one or more materials selected from the group.
  • the fluorine-containing binder may include polytetrafluoroethylene (PTFE). It is preferable that the fluorine-containing binder is contained in the composition for a supercapacitor electrode in an amount of 1 to 20 parts by weight based on 100 parts by weight of the electrode active material.
  • PTFE polytetrafluoroethylene
  • the conductive material is not particularly limited as long as it is an electronic conductive material that does not cause chemical changes, and examples thereof include natural graphite, artificial graphite, carbon black, acetylene black, Ketjen black, Super-P, carbon fiber, copper, nickel, Metal powder or metal fibers such as aluminum and silver are possible.
  • the conductive material is preferably contained in the composition for a supercapacitor electrode in an amount of 0.1 to 20 parts by weight based on 100 parts by weight of the electrode active material.
  • the dispersion medium is methanol, ethanol, propanol, butanol, methyl ethyl ketone, methyl isobutyl ketone, methyl isobutyl ketone, toluene and xylene ( Xylene), distilled water, and mixtures thereof.
  • the dispersion medium is preferably contained in the composition for a supercapacitor electrode in an amount of 100 to 300 parts by weight based on 100 parts by weight of the electrode active material.
  • the additive includes 2-(dimethylamino)ethyl methacrylate.
  • the 2-dimethylaminoethyl methacrylate improves the moldability, improves the durability of the electrode, and makes it possible to improve the electrode density.
  • the additive is preferably contained in an amount of 0.01 to 2 parts by weight based on 100 parts by weight of the electrode active material in the composition for a supercapacitor electrode.
  • the structural formula of 2-dimethylaminoethyl methacrylate is shown below.
  • the composition for the supercapacitor electrode further comprises 0.01 to 2 parts by weight of 2-[(3-acrylamidopropyl dimethylammonio acetate (CBAA; 2-[(3-acrylamidopropyl) dimethylammonio] acetate) based on 100 parts by weight of the electrode active material.
  • CBAA 2-[(3-acrylamidopropyl dimethylammonio acetate)
  • the 2-[(3-acrylamidopropyl dimethylammonio acetate) enhances the binding power to the current collector, improves the impregnation property of the electrolyte, and enables the improvement of electrode density.
  • the composition for a supercapacitor electrode has good contact with other raw materials, low resistance, increased electrode density, and improved durability by using a small amount of additives together with a binder, thereby exhibiting excellent cell efficiency.
  • An electrode active material, a conductive material, a fluorine-containing binder, an additive, and a dispersion medium are mixed to prepare a composition for a supercapacitor electrode.
  • the composition for a supercapacitor electrode includes an electrode active material, 0.1 to 20 parts by weight of a conductive material based on 100 parts by weight of the electrode active material, 1 to 20 parts by weight of a binder based on 100 parts by weight of the electrode active material, and 100 parts by weight of the electrode active material. It contains 0.01 to 2 parts by weight of the additive and 100 to 300 parts by weight of the dispersion medium based on 100 parts by weight of the electrode active material.
  • the electrode active material may include a porous carbon material such as activated carbon having a specific surface area of 1500 ⁇ 3000 m 2 /g, graphene having a specific surface area of 100 ⁇ 1000 m 2 /g, carbon nanotubes, carbon nanofibers, and the like.
  • a porous carbon material such as activated carbon having a specific surface area of 1500 ⁇ 3000 m 2 /g, graphene having a specific surface area of 100 ⁇ 1000 m 2 /g, carbon nanotubes, carbon nanofibers, and the like.
  • the conductive material is not particularly limited as long as it is an electronic conductive material that does not cause chemical changes, and examples thereof include natural graphite, artificial graphite, carbon black, acetylene black, Ketjen black, Super-P, carbon fiber, copper, nickel, Metal powder or metal fibers such as aluminum and silver are possible.
  • the conductive material is preferably contained in the composition for a supercapacitor electrode in an amount of 0.1 to 20 parts by weight based on 100 parts by weight of the electrode active material.
  • the fluorine-containing binder may include polytetrafluoroethylene (PTFE). It is preferable that the fluorine-containing binder is contained in the composition for a supercapacitor electrode in an amount of 1 to 20 parts by weight based on 100 parts by weight of the electrode active material.
  • PTFE polytetrafluoroethylene
  • the dispersion medium is methanol, ethanol, propanol, butanol, methyl ethyl ketone, methyl isobutyl ketone, methyl isobutyl ketone, toluene and xylene ( Xylene), distilled water, and mixtures thereof.
  • the dispersion medium is preferably contained in the composition for a supercapacitor electrode in an amount of 100 to 300 parts by weight based on 100 parts by weight of the electrode active material.
  • the additive includes 2-(dimethylamino)ethyl methacrylate.
  • the 2-dimethylaminoethyl methacrylate improves the moldability, improves the durability of the electrode, and makes it possible to improve the electrode density.
  • the additive is preferably contained in an amount of 0.01 to 2 parts by weight based on 100 parts by weight of the electrode active material in the composition for a supercapacitor electrode.
  • the composition for the supercapacitor electrode further comprises 0.01 to 2 parts by weight of 2-[(3-acrylamidopropyl dimethylammonio acetate (CBAA; 2-[(3-acrylamidopropyl) dimethylammonio] acetate) based on 100 parts by weight of the electrode active material.
  • CBAA 2-[(3-acrylamidopropyl dimethylammonio acetate)
  • the 2-[(3-acrylamidopropyl dimethylammonio acetate) improves moldability, improves durability of an electrode, and enables an increase in electrode density.
  • a high-speed mixer such as a planetary mixer
  • agitated for a predetermined period of time for example, 10 minutes to 12 hours
  • a composition for a supercapacitor electrode can be obtained.
  • a high-speed mixer such as a planetary mixer enables the preparation of a uniformly mixed supercapacitor electrode composition. At this time, it is also possible to induce uniform dispersion by using ultrasonic waves.
  • a composition for a supercapacitor electrode which is a mixture of an electrode active material, a conductive material, a fluorine-containing binder, an additive, and a dispersion medium, is pressed to form an electrode, or the composition for a supercapacitor electrode is coated on a metal foil or a current collector to form an electrode.
  • the supercapacitor electrode composition is pushed with a roller to form a sheet, and attached to a metal foil or a current collector to form an electrode, and the resultant formed in the electrode form is dried to form an electrode.
  • the composition for a supercapacitor electrode may be pressed and molded using a roll press molding machine.
  • the roll press molding machine is aimed at improving electrode density and controlling the thickness of the electrode through rolling, a controller that can control the thickness and heating temperature of the upper and lower rolls and rolls, and a winding that can unwind and wind the electrode. Includes wealth.
  • the pressurization pressure of the roll press is preferably 1 to 20 ton/cm 2 and the temperature of the roll is 0 to 150°C.
  • the composition for a supercapacitor electrode that has undergone the press-compression process as described above is subjected to a drying process.
  • the drying process is carried out at a temperature of 100°C to 350°C, preferably 150°C to 300°C.
  • the drying temperature is 100°C or higher and not more than 350°C.
  • the drying process is preferably carried out for about 10 minutes to 12 hours at the same temperature as above. This drying process improves the strength of the electrode by binding the electrode active material and the conductive material particles.
  • the composition for the supercapacitor electrode may be used as a metal foil such as a titanium foil, an aluminum foil, or an etching aluminum foil. It may be coated on a current collector such as an aluminum current collector, or the composition for a supercapacitor electrode may be pushed with a roller to form a sheet (rubber type) and attached to a metal foil or current collector to form a positive electrode or a negative electrode.
  • the etched aluminum foil means that the aluminum foil is etched in an uneven shape
  • the etched aluminum current collector means that the aluminum current collector is etched in a requested shape.
  • a drying process is performed on the shape of the anode or cathode that has undergone the above process.
  • the drying process is carried out at a temperature of 100°C to 350°C, preferably 150°C to 300°C.
  • a temperature of 100°C to 350°C preferably 150°C to 300°C.
  • the drying temperature is 100°C or higher and not more than 350°C.
  • the drying process is preferably carried out for about 10 minutes to 6 hours at the same temperature as above.
  • the supercapacitor electrode manufactured as described above can be usefully applied to a small coin-type supercapacitor as shown in FIG. 1, a wound-type supercapacitor as shown in FIGS. 2 to 5, and the like.
  • FIG. 1 is a state diagram of a use of a supercapacitor electrode according to the present invention, showing a cross-sectional view of a coin-type supercapacitor to which the supercapacitor electrode is applied.
  • reference numeral 190 denotes a metal cap as a conductor
  • reference numeral 160 denotes a separator made of a porous material for insulation and short-circuit prevention between the anode 120 and the cathode 110
  • reference numeral 192 denotes a leakage of electrolyte. It is a gasket to prevent protection and insulation and short-circuit prevention.
  • the positive electrode 120 and the negative electrode 110 are firmly fixed by a metal cap 190 and an adhesive.
  • the coin-type supercapacitor is disposed between the positive electrode 120 made of the above-described supercapacitor electrode, the negative electrode 110 made of the above-described supercapacitor electrode, and the positive electrode 120 and the negative electrode 110, and the positive electrode 120
  • a separator 160 for preventing a short circuit between the and the cathode 120 is disposed in the metal cap 190, and an electrolyte solution in which the electrolyte is dissolved between the anode 120 and the cathode 110 is injected, It can be manufactured by sealing with a gasket 192.
  • the separator is a polyethylene nonwoven fabric, a polypropylene nonwoven fabric, a polyester nonwoven fabric, a polyacrylonitrile porous separator, a poly(vinylidene fluoride) hexafluoropropane copolymer porous separator, a cellulose porous separator, a kraft paper or rayon fiber, etc. If it is a separator generally used in the field, there is no particular limitation.
  • the electrolyte to be charged in the supercapacitor is TEABF 4 (tetraethylammonium tetrafluoborate) and TEMABF 4 (tetraethylammonium tetrafluoborate) and TEMABF 4 ( triethylmethylammonium tetrafluoborate) in which at least one selected salt is dissolved may be used.
  • the electrolyte may contain one or more ionic liquids selected from EMIBF 4 (1-ethyl-3-methyl imidazolium tetrafluoborate) and EMITFSI (1-ethyl-3-methyl imidazolium bis (trifluoromethane sulfonyl) imide). .
  • FIGS. 2 to 5 are diagrams illustrating a state of use of a supercapacitor electrode according to another example, and are views illustrating a wound-type supercapacitor to which a supercapacitor electrode is applied. A method of manufacturing a wound-type supercapacitor will be described in detail with reference to FIGS. 2 to 5.
  • lead wires 130 and 140 are attached to the anode 120 and cathode 110 made of the above-described supercapacitor electrode, respectively.
  • a first separator 150, an anode 120, a second separator 160, and a working electrode (cathode 110) are stacked and coiled to form a roll. After being manufactured with the winding element 175 of, it is wound around a roll with an adhesive tape 170 or the like so that the roll shape can be maintained.
  • the second separator 160 provided between the anode 120 and the cathode 110 serves to prevent a short circuit between the anode 120 and the cathode 110.
  • the first and second separators 150 and 160 are polyethylene nonwoven fabric, polypropylene nonwoven fabric, polyester nonwoven fabric, polyacrylonitrile porous separator, poly(vinylidene fluoride) hexafluoropropane copolymer porous separator, cellulose porous separator, kraft paper. Alternatively, it is not particularly limited as long as it is a separator generally used in the field of batteries and capacitors such as rayon fibers.
  • a sealing rubber 180 is mounted on the resultant in the form of a roll, and a metal cap (eg, an aluminum case) 190 is inserted.
  • a metal cap eg, an aluminum case
  • the electrolyte is injected and sealed so that the roll-shaped winding element 175 (positive electrode 120 and negative electrode 110) is impregnated.
  • the electrolyte is 1 selected from TEABF 4 (tetraethylammonium tetrafluoborate) and TEMABF 4 (triethylmethylammonium tetrafluoborate) in at least one solvent selected from propylene carbonate (PC; propylene carbonate), acetonitrile (AN; acetonitrile) and sulfolane (SL). It is possible to use those in which more than one species are dissolved.
  • PC propylene carbonate
  • AN acetonitrile
  • SL sulfolane
  • the electrolyte may contain one or more ionic liquids selected from EMIBF 4 (1-ethyl-3-methyl imidazolium tetrafluoborate) and EMITFSI (1-ethyl-3-methyl imidazolium bis (trifluoromethane sulfonyl) imide). .
  • the wound-type supercapacitor manufactured as described above is schematically shown in FIG. 5.
  • DMAEMA' 2-(dimethylamino)ethyl methacrylate
  • the composition for electrodes in a kneaded state was molded in a roll press molding machine until the surface became smooth to form a sheet of the composition for electrodes.
  • the roll press molding machine is provided including an upper roll and a lower roll, and is formed by passing the electrode composition between the upper and lower rolls. The result of passing between the upper and lower rolls was folded in half, and the process of passing between the upper and lower rolls was repeated 15 times to obtain a composition sheet for electrodes having a smooth surface. Through rolling of the roll press molding machine, the electrode density can be improved and the thickness of the electrode can be controlled.
  • the pressing pressure applied to the electrode composition was about 10 ton/cm 2, and the heating temperature was about 60°C.
  • the electrode composition sheet formed using a roll press molding machine was punched into a size of 12 mm in diameter.
  • the resulting product formed by punching was dried in a vacuum dryer. The drying was performed at a temperature of 150° C. for 24 hours.
  • the electrode sheet thus prepared was used as a supercapacitor electrode.
  • a coin cell type supercapacitor having a diameter of 20 mm and a height of 3.2 mm was manufactured.
  • an electrolyte containing 1M of TEABF 4 in a propylene carbonate (PC) solvent was used, and TF4035 (manufactured by NKK, Japan) was used as the separator.
  • Example 1 A comparative example is presented so that the characteristics of Example 1 can be more easily grasped, and the comparative examples below are presented merely to aid understanding and are not prior art of the present invention.
  • PTFE polytetrafluoroethylene
  • the composition for electrodes in a kneaded state was molded in a roll press molding machine until the surface became smooth to form a sheet of the composition for electrodes.
  • the roll press molding machine is provided including an upper roll and a lower roll, and is formed by passing the electrode composition between the upper and lower rolls. The result of passing between the upper and lower rolls was folded in half, and the process of passing between the upper and lower rolls was repeated 15 times to obtain a composition sheet for electrodes having a smooth surface. Through rolling of the roll press molding machine, the electrode density can be improved and the thickness of the electrode can be controlled.
  • the pressing pressure applied to the electrode composition was about 10 ton/cm 2, and the heating temperature was about 60°C.
  • the electrode composition sheet formed using a roll press molding machine was punched into a size of 12 mm in diameter.
  • the resulting product formed by punching was dried in a vacuum dryer. The drying was performed at a temperature of 150° C. for 24 hours.
  • the electrode sheet thus prepared was used as a supercapacitor electrode.
  • a coin cell type supercapacitor having a diameter of 20 mm and a height of 3.2 mm was manufactured.
  • an electrolyte containing 1M of TEABF 4 in a propylene carbonate (PC) solvent was used, and TF4035 (manufactured by NKK, Japan) was used as the separator.
  • Table 1 below shows the moldability and mixing time of the electrode composition prepared according to Example 1 and the electrode composition prepared according to the comparative example.
  • the electrode density of the supercapacitor electrode manufactured according to Example 1 and the electrode density of the supercapacitor electrode manufactured according to the comparative example were measured, and are shown in Table 1 below.
  • the specific storage capacity of the supercapacitor manufactured according to Example 1 and the specific storage capacity of the supercapacitor manufactured according to the comparative example were measured and shown in Table 1 below.
  • the supercapacitor electrode manufactured according to Example 1 was found to have a higher electrode density than the supercapacitor electrode manufactured according to the comparative example.
  • the supercapacitor manufactured according to Example 1 was found to have superior storage capacity compared to the supercapacitor manufactured according to the comparative example.
  • first lead wire 140 second lead wire
  • first separation membrane 160 second separation membrane
  • the present invention it is possible to improve the moldability, the durability of the electrode can be improved, the electrode density can be improved, and there is industrial applicability.

Abstract

La présente invention concerne une composition d'une électrode de supercondensateur, un procédé de fabrication d'une électrode de supercondensateur l'utilisant, et un supercondensateur fabriqué à l'aide du procédé de fabrication, la composition comprenant : un matériau actif d'électrode ; 0,1 à 20 parties en poids d'un matériau conducteur par rapport à 100 parties en poids du matériau actif d'électrode ; 1 à 20 parties en poids d'un liant contenant du fluor par rapport à 100 parties en poids du matériau actif d'électrode ; 0,01 à 2 parties en poids d'un additif par rapport à 100 parties en poids du matériau actif d'électrode ; et 100 à 300 parties en poids d'un milieu de dispersion par rapport à 100 parties en poids du matériau actif d'électrode, l'additif comprenant du 2-(diméthylamino)éthyl méthacrylate. La présente invention permet d'améliorer la formabilité, d'améliorer la durabilité d'une électrode et d'améliorer la densité d'électrode.
PCT/KR2020/005542 2019-10-31 2020-04-27 Composition d'électrode de supercondensateur permettant d'améliorer la densité d'électrode, procédé de fabrication d'électrode de supercondensateur l'utilisant, et supercondensateur fabriqué à l'aide du procédé de fabrication WO2021085767A1 (fr)

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KR1020190137161A KR102188242B1 (ko) 2019-10-31 2019-10-31 전극밀도를 개선할 수 있는 슈퍼커패시터 전극용 조성물, 이를 이용한 슈퍼커패시터 전극의 제조방법 및 상기 제조방법을 이용하여 제조된 슈퍼커패시터

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