WO2016002930A1 - Procédé de production d'électrode polarisable pour condensateurs électriques à double couche, électrode polarisable pour condensateurs électriques à double couche et condensateur électrique à double couche - Google Patents

Procédé de production d'électrode polarisable pour condensateurs électriques à double couche, électrode polarisable pour condensateurs électriques à double couche et condensateur électrique à double couche Download PDF

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Publication number
WO2016002930A1
WO2016002930A1 PCT/JP2015/069271 JP2015069271W WO2016002930A1 WO 2016002930 A1 WO2016002930 A1 WO 2016002930A1 JP 2015069271 W JP2015069271 W JP 2015069271W WO 2016002930 A1 WO2016002930 A1 WO 2016002930A1
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WIPO (PCT)
Prior art keywords
pair
double layer
electric double
activated carbon
layer capacitor
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PCT/JP2015/069271
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English (en)
Japanese (ja)
Inventor
眞澄 福間
志斗 福島
孝幸 内田
吉野　勝美
仁一 小川
Original Assignee
株式会社佐藤工務所
島根県
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Priority claimed from JP2014138749A external-priority patent/JP6558725B2/ja
Priority claimed from JP2015035120A external-priority patent/JP6630982B2/ja
Application filed by 株式会社佐藤工務所, 島根県 filed Critical 株式会社佐藤工務所
Publication of WO2016002930A1 publication Critical patent/WO2016002930A1/fr

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-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
    • H01G11/24—Electrodes characterised by structural features of the materials making up or comprised in the electrodes, e.g. form, surface area or porosity; characterised by the structural features of powders or particles used therefor
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-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
    • H01G11/44—Raw materials therefor, e.g. resins or coal
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-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
    • H01G11/54—Electrolytes
    • H01G11/58—Liquid electrolytes
    • H01G11/62—Liquid electrolytes characterised by the solute, e.g. salts, anions or cations therein
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-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 method for producing a polarizable electrode for an electric double layer capacitor using activated carbon, a polarizable electrode for an electric double layer capacitor, and an electric double layer capacitor.
  • the present invention relates to a method for producing a polarizable electrode for an electric double layer capacitor, a polarizable electrode for an electric double layer capacitor, and an electric double layer capacitor that can be easily produced and can reduce production costs.
  • an electric double layer composed of a positive charge layer and a negative charge layer is formed at the interface between the conductor and the electrolytic solution.
  • An electric double layer capacitor stores electric energy by utilizing this phenomenon.
  • the electric double layer capacitor can be rapidly charged, and has an excellent characteristic that it hardly deteriorates even when repeated charging and discharging, as compared with a conventional secondary battery.
  • the electric double layer capacitor has a drawback that the capacity (capacitance) of stored electric energy is smaller than that of a secondary battery such as a lithium battery.
  • the polarizable electrode included in the electric double layer capacitor described in Patent Document 1 is formed into a sheet shape by kneading a binder with powdered activated carbon. There is a problem that it is not easy and takes time and cost.
  • the polarizable electrode included in the electric double layer capacitor described in Patent Document 2 uses sheet-like activated carbon formed from cotton, and can be manufactured relatively easily and at low cost. With the rapid cost reduction of electric vehicles and the like, further cost reduction is required.
  • the present invention has been made in view of the prior art as described above, and can be easily manufactured, and the method for manufacturing a polarizable electrode for an electric double layer capacitor capable of suppressing the manufacturing cost, and the electric double layer capacitor It is an object of the present invention to provide a polarizing electrode for use and an electric double layer capacitor.
  • the present invention provides a carbonization treatment step for carbonizing wood or tomato seeds to produce a carbide, and a pulverization for producing a powdered carbide by pulverizing the carbide created by the carbonization treatment step.
  • a powdery activated carbon obtained by activating the powdered carbide selected in the sorting step, a sorting step of sorting out the powdered carbide having a particle size of 1 mm or less among the powdered carbides produced by the step and the pulverizing step And a forming step of mixing the powdered activated carbon produced by the activation treatment step with a predetermined liquid to form an electrode shape.
  • a method for manufacturing a polar electrode is provided.
  • the manufacturing cost can be suppressed.
  • tomato fruits used in the present invention include non-edible European tomato fruits called Kastanien Nut.
  • carbonizing wood or tochi fruits among powdered carbides produced by pulverization, selecting powdered carbides having a particle size of 1 mm or less, and activating treatment to produce powdered activated carbon, The particle size of the powdered activated carbon can also be kept to 1 mm or less.
  • a powdered carbide having a particle size of 1 mm or less means that the circumscribed sphere diameter of the powdered carbide is 1 mm or less.
  • a sieve having an opening size of 1 mm or less may be used. And what is necessary is just to activate the powdered carbide which fell from this sieve as a selected powdered carbide.
  • the particle size of the powdered carbide is too small, the powdered carbide is likely to be scattered in the air. For this reason, it is preferable to select powdered carbide having a particle size of 0.1 mm to 1 mm.
  • a powdered carbide having a particle size of 0.1 mm or more and 1 mm or less for example, after selecting a powdered carbide having a particle size of 1 mm or less using the sieve described above, Furthermore, a sieve having a mesh size of 0.1 mm or more and less than 1 mm may be used. Then, the powdered carbide remaining without falling from the sieve may be activated as a selected powdered carbide.
  • the powdery carbide is subjected to an alkali activation treatment, and further includes a washing step of washing the powdered activated carbon produced by the activation treatment step before the molding step, A step of immersing the powdered activated carbon in water at a temperature of 10 ° C. to 85 ° C. for a predetermined time and a step of dehydrating the powdered activated carbon after the immersion.
  • a washing step of washing the powdered activated carbon produced by the activation treatment step before the molding step A step of immersing the powdered activated carbon in water at a temperature of 10 ° C. to 85 ° C. for a predetermined time and a step of dehydrating the powdered activated carbon after the immersion.
  • the capacitance of the electric double layer capacitor can be increased by using the alkali activation treatment. Further, by including a cleaning step of cleaning the powdered activated carbon before the molding step, foreign matters remaining on the powdered activated carbon can be removed, so that the capacitance of the electric double layer capacitor can be increased.
  • the present invention mixes a powdered activated carbon produced by activating a powdered carbide having a particle diameter of 1 mm or less produced from wood or tochi fruits and a predetermined liquid. It is also provided as a polarizable electrode for an electric double layer capacitor.
  • the activation treatment is an alkali activation treatment
  • the powdered activated carbon is dehydrated after being immersed in water at 10 ° C. or higher and 85 ° C. or lower for a predetermined time, and then mixed with the predetermined liquid to be molded. .
  • the present invention provides a pair of polarizable electrodes as described above, a pair of collector electrodes interposed between the pair of polarizable electrodes, and the pair of collector electrodes, respectively.
  • a pair of connected terminals a separator interposed between the pair of polarizable electrodes and insulating the pair of polarizable electrodes, an electrolyte impregnated in the pair of polarizable electrodes, and the pair A polarizable electrode, the pair of collector electrodes, the separator, and an outer bag containing the electrolytic solution, and the opening of the outer bag has a part of the pair of connection terminals outside the outer bag.
  • It is also provided as an electric double layer capacitor characterized by being sealed in an exposed state.
  • the electric double layer capacitor of the present invention a voltage is applied to the pair of polarizable electrodes via the pair of collector electrodes by connecting a power source to the pair of connection terminals. Thereby, an electric double layer is formed at the interface between each of the pair of polarizable electrodes and the electrolytic solution, and electric energy is charged. The charged electric energy can be discharged from the pair of connection terminals.
  • a pair of polarizable electrodes, a pair of collector electrodes, a separator, and an opening portion of an outer bag for containing an electrolyte solution are formed, and a part of each pair of connection terminals is outside the outer bag. Since it is sealed in an exposed state, the electrolytic solution is prevented from leaking out of the exterior bag.
  • the electric double layer capacitor according to the present invention includes a sealing auxiliary portion attached to a surface of the connection terminal, and the opening of the exterior bag has an opening edge forming the opening as the sealing auxiliary portion. It is sealed by thermocompression bonding.
  • the electrolyte even if the electrolyte flows through each collector electrode and each connection terminal, the electrolyte is dammed by the sealing auxiliary portion, so that the electrolyte leaks out of the outer bag. Further prevention is possible.
  • the sealing auxiliary portion surrounds the surface of the connection terminal via an adhesive and extends in a direction intersecting the extending direction of the connection terminal, and sandwiches the surrounding portion. And a clamping part.
  • the surrounding portion is sandwiched by the sandwiching portion extending in the direction intersecting with the extending direction of the connection terminal, it is possible to reliably prevent the electrolyte from leaking out of the outer bag by the sandwiching portion. Is possible. That is, even if there is a slight gap between the edge of the surrounding portion along the direction in which the connection terminal extends and the opening edge that forms the opening of the exterior bag, it has flowed through the collector electrode and the connection terminal. It is possible to prevent the electrolytic solution from seeping out of the outer bag through the gap.
  • the surrounding portion is in close contact with the surface of the connection terminal via the adhesive, the electrolyte solution is prevented from oozing out of the exterior bag through the gap between the connection terminal and the surrounding portion. In this respect as well, it is possible to reliably prevent the electrolytic solution from leaking out of the outer bag.
  • the adhesive is an epoxy resin adhesive
  • the surrounding portion is formed of polyolefin
  • the inner surface side of the exterior bag is formed of polyethylene
  • the sandwiching portion is the surrounding portion or the It is formed from the same kind of material as the inner surface side of the outer bag.
  • the adhesive made from the epoxy resin which has alkali resistance is used as an adhesive agent for sticking a surrounding part to the surface of a connection terminal, it penetrate
  • the surrounding part is made of polyolefin
  • the inner side of the outer bag is made of polyethylene
  • the sandwiching part is made of the same kind of material as the inner part or the inner side of the outer bag, the outer part, the sandwiching part and the outer bag are thermally welded. And the opening of the exterior bag can be reliably sealed.
  • the powdered activated carbon is produced by an alkali activation treatment using a sodium hydroxide aqueous solution
  • the electrolyte is a potassium hydroxide aqueous solution.
  • the powdered activated carbon produced by the alkali activation treatment using an inexpensive aqueous solution of sodium hydroxide is used, and the aqueous solution of potassium hydroxide is used as the electrolytic solution.
  • the electric capacity increases, the manufacturing cost can be suppressed.
  • carbonization treatment which carbonizes cotton and produces the 2nd carbide
  • the manufacturing cost can be suppressed.
  • the first activated carbon made from wood and the like and not only the predetermined liquid but also the second activated carbon made from cotton are mixed, it becomes easy to form into an electrode shape. A polar electrode can be easily manufactured.
  • the present invention includes a first carbide produced by carbonizing at least one of wood, bamboo and rice husk, and a second carbide produced by carbonizing cotton. Electricity characterized by being formed by mixing a predetermined liquid with a first activated carbon and a second activated carbon prepared by activating each of the pulverized first carbide and second carbide after pulverization. It is also provided as a polarizable electrode for a double layer capacitor.
  • the polarizable electrode for an electric double layer capacitor according to the present invention contains at least 5% by weight of the second activated carbon.
  • molding into an electrode shape becomes still easier by containing the 2nd activated carbon produced from cotton at least 5weight%.
  • the present invention electrically connects the pair of polarizable electrodes described above, the pair of collector electrodes interposed between the pair of polarizable electrodes, and the pair of collector electrodes, respectively.
  • An electrode, the pair of collector electrodes, the separator, and an exterior bag containing the electrolyte solution, and the opening of the exterior bag is a state in which a part of each of the pair of connection terminals is exposed to the outside of the exterior bag It is also provided as an electric double layer capacitor that is hermetically sealed.
  • the electric double layer capacitor of the present invention a voltage is applied to the pair of polarizable electrodes via the pair of collector electrodes by connecting a power source to the pair of connection terminals. Thereby, an electric double layer is formed at the interface between each of the pair of polarizable electrodes and the electrolytic solution, and electric energy is stored.
  • a pair of polarizable electrodes, a pair of collector electrodes, a separator, and an opening portion of an outer bag for containing an electrolyte solution are formed, and a part of each pair of connection terminals is outside the outer bag. Since it is sealed in an exposed state, the electrolytic solution is prevented from leaking out of the exterior bag.
  • the manufacturing method of the polarizable electrode for electric double layer capacitors which can suppress manufacturing cost, the polarizable electrode for electric double layer capacitors, and an electric double layer capacitor can be provided. It is.
  • FIG. 1 It is a figure which shows schematic structure of the electric double layer capacitor which concerns on 1st Embodiment of this invention. It is a figure which shows schematic structure and the manufacturing method of the sealing assistance part shown in FIG. It is a flowchart which shows each process included in the manufacturing method of the polarizable electrode shown in FIG. It is a figure explaining the manufacturing method of the electric double layer capacitor after a formation process shown in Drawing 3, and a formation process. The circuit diagram for measuring the electrostatic capacitance and internal resistance of an electric double layer capacitor is shown. It is a figure which shows the result of the test 1 about the electric double layer capacitor which concerns on 1st Embodiment of this invention.
  • FIG. 1 is a diagram showing a schematic configuration of the electric double layer capacitor according to the first embodiment of the present invention.
  • 1A is a perspective view
  • FIG. 1B is an enlarged cross-sectional view of the cross section indicated by the broken line in FIG.
  • assistant part 7 is abbreviate
  • FIG. 1 is a diagram showing a schematic configuration of the electric double layer capacitor according to the first embodiment of the present invention.
  • 1A is a perspective view
  • FIG. 1B is an enlarged cross-sectional view of the cross section indicated by the broken line in FIG.
  • assistant part 7 is abbreviate
  • the electric double layer capacitor 100 includes a pair of sheet-like polarizable electrodes 1, a pair of sheet-like collector electrodes 2 that interpose the pair of polarizable electrodes 1, A pair of sheet-like connection terminals 3 electrically connected to the pair of collector electrodes 2 respectively, and a sheet-like separator 4 interposed between the pair of polarizable electrodes 1 to insulate the pair of polarizable electrodes 1 from each other.
  • an electrolyte bag 5 impregnated in the pair of polarizable electrodes 1, a pair of polarizable electrodes 1, a pair of collector electrodes 2, a separator 4, and an exterior bag 6 that accommodates the electrolyte solution 5.
  • the opening 61 is sealed so as to prevent the electrolytic solution 5 from leaking out of the exterior bag 6 in a state where a part of each of the pair of connection terminals 3 is exposed to the exterior of the exterior bag 6.
  • the electric double layer capacitor 100 when a power source is connected to the pair of connection terminals 3, a voltage is applied to the pair of polarizable electrodes 1 via the pair of collector electrodes 2. Thereby, an electric double layer is formed at the interface between each of the pair of polarizable electrodes 1 and the electrolytic solution 5, and electric energy is charged. The charged electrical energy can be discharged from the pair of connection terminals 3.
  • the voltage (equal to the discharge voltage) applied to the polarizable electrode 1 is 1. to avoid electrolysis of the electrolyte.
  • a power supply that is 23 V or less is used. In order to increase the discharge voltage, a plurality of electric double layer capacitors 100 may be connected in series.
  • the collector electrode 2 needs to be composed of a conductor at least on the surface in contact with the polarizable electrode 1, but in the present embodiment, the whole is composed of a conductor.
  • the metal used as the conductor include nickel, cobalt, iron, silver, gold, platinum, or any combination thereof.
  • iron is used as the collector electrode 2 and the connection terminal 3 in consideration of cost.
  • the connection terminal 3 is connected to the collector electrode 2 using spot welding.
  • the electrostatic capacity cannot be sufficiently increased when the concentration is outside the range of 10 to 40% by weight.
  • the electrolyte solution which becomes a strong alkali can be easily neutralized with hydrochloric acid or the like, it can be safely discarded after use.
  • the separator 4 includes a polarizable electrode 1 and a collecting electrode 2 disposed on one side (upper side in FIG. 1B), and a polarizable electrode 1 disposed on the other side (lower side in FIG. 1B). And an alkali-resistant insulating sheet that prevents contact with the collector electrode 2, and is configured not to hinder the flow of ions between the pair of polarizable electrodes 1.
  • a sheet made of alkali-resistant paper (filter paper) that does not easily shrink when impregnated with a liquid, or a cellulose fiber or polyvinyl alcohol fiber that has been subjected to a water-resistant treatment can be used as the separator 2.
  • the separator 4 of this embodiment is not provided only between a pair of polarizable electrodes 1, but the polarizable electrode 1 and collector 2 of one side, and the polarizable electrode 1 and collector of the other side 2 are provided so as to cover each of them.
  • the polarizable electrode 1 is made from wood such as firewood, pine, cedar, mangrove or tomato seeds, and carbonized to produce carbide by pulverizing the carbide produced by the carbonization process.
  • the pulverization process for producing powdered carbide, the selection process for selecting powdered carbide having a particle size of 1 mm or less among the powdered carbides prepared by the pulverization process, and the activation of the powdered carbide selected by the selection process It is manufactured by a manufacturing method including an activation treatment step for producing powdered activated carbon by treatment, and a molding step for mixing the powdered activated carbon produced by the activation treatment step and a predetermined liquid to form an electrode shape. Details of the method of manufacturing the polarizable electrode 1 will be described later.
  • the outer bag 6 can be flexibly deformed, and the inner surface side is formed of polyethylene having alkali resistance, and the outer surface side is formed of polyvinyl chloride.
  • the electric double layer capacitor 100 according to the present embodiment includes, as a preferable configuration, a sealing auxiliary portion 7 attached to the surface of the connection terminal 3, and the opening 61 of the outer bag 6 has an opening edge that forms the opening 61. 62 is hermetically sealed by thermocompression bonding with the sealing auxiliary portion 7 interposed therebetween.
  • FIG. 2 is a diagram illustrating a schematic configuration and a manufacturing method of the sealing assisting portion 7.
  • 2 (a) to 2 (e) are left side views and FIG. 2 (f) are plan views, the right side views of FIGS. 2 (a) to 2 (c) are side views, and FIGS. 2 (d) and 2 (e).
  • the right side of FIG. 4 shows a view seen from the direction (X direction) in which the connection terminal 3 extends.
  • the exterior bag 6, the surrounding part 72, and the clamping part 73 do not necessarily need to be transparent, in FIG. 2, these are illustrated as transparent. As shown in FIG.
  • the sealing assisting portion 7 surrounds the surface of the connection terminal 3 through the adhesive 71 and is in close contact with the surface, and a direction crossing the extending direction of the connection terminal 3 (Y And a sandwiching portion 73 that sandwiches the surrounding portion 72.
  • a method for producing the sealing assisting portion 7 will be described.
  • an epoxy resin adhesive (for example, Araldite manufactured by Huntsman Japan Co., Ltd.) 71 is applied to the surface of the connection terminal 3.
  • the connection terminal 3 is passed through the surrounding portion 72 so that the surrounding portion 72 covers the adhesive 71.
  • the surrounding portion 72 is a heat shrinkable tube made of polyolefin having a shrinkage start temperature of 70 ° C., a melting point of 85 to 105 ° C., an inner diameter of 3 mm, and a thickness of 0.1 mm.
  • the surrounding portion 72 is contracted by heating the surrounding portion 72 with a heat gun or the like. With the shrinkage of the surrounding portion 72, the adhesive 71 spreads over the entire inner surface of the surrounding portion 72, and then the adhesive portion 71 is cured, so that the surrounding portion 72 adheres to the surface of the connection terminal 3.
  • a notch is made in the heat shrinkable tube of the same type as the surrounding portion 72, and the sandwiched portion 73 is formed by expanding the notched portion.
  • the surrounding part 72 is pinched
  • the sandwiching portion 73 is sandwiched between a pair of heat resistant films (polyimide film) 8, and the sandwiching portion 73 is heated and pressurized in the direction of the arrow in FIG. As a result, as shown in FIG.
  • the sandwiching portion 73 is thermally welded to the surrounding portion 72 and integrated to form the sealing auxiliary portion 7 having a cross shape in plan view.
  • the clamping part 73 is produced using the heat shrinkable tube of the same kind (made of polyolefin) as the surrounding part 72, it is not restricted to this, The same kind as the inner surface side of the exterior bag 6 Any material that can be thermally welded to the surrounding portion 72 and the exterior bag 6 such as a material (polyethylene) can be used as the sandwiching portion 73.
  • the sealing auxiliary portion 7 attached to the surface of the connection terminal 3 manufactured as described above is inserted into the outer bag 6 as shown in FIG.
  • FIG. 2 (f) only one connection terminal 3 and one sealing auxiliary portion 7 attached to the surface of the connection terminal 3 are shown.
  • the electric double layer capacitor 100 includes a pair of connection terminals 3. (See FIG. 1), a pair of sealing auxiliary portions 7 attached to the connection terminals 3 are inserted into the outer bag 6.
  • the polarizable electrode 1, the collector electrode 2, the separator 4, and the electrolyte solution 5 connected to the connection terminal 3 are also packaged simultaneously with the insertion of the sealing auxiliary portion 7. It is inserted into the bag 6.
  • the seal part 63 is formed by thermocompression-bonding the opening edge 62 of the exterior bag 6 with the sealing auxiliary part 7 interposed therebetween using a sealer, and the opening 61 of the exterior bag 6 is sealed. That is, the portion of the opening edge 62 of the outer bag 6 that sandwiches the sealing assisting portion 7 is heat-welded between the inner surface of the opening edge 62 and the sealing assisting portion 7, and the portion that does not sandwich the sealing assisting portion 7. The inner surfaces of the opening edge 62 are thermally welded.
  • the opening edge 62 of the outer bag 6 in which the sealing assisting part 7 is located is heated and pressurized using a sealer provided with a linear heater, so that the holding part 73 extends.
  • a linear groove portion 64 is formed along the outer periphery 6, thereby further ensuring the adhesion between the outer bag 6 and the sealing auxiliary portion 7.
  • the electrolytic solution 5 flows along the collector electrode 2 and the connection terminal 3 by the sealing auxiliary portion 7 described above, the electrolytic solution 5 is dammed up by the sealing auxiliary portion 7. It is possible to prevent leakage to the outside. More specifically, since the surrounding portion 72 is sandwiched by the sandwiching portion 73 extending in a direction intersecting with the direction in which the connection terminal 3 extends, the edge of the surrounding portion 72 along the direction in which the connection terminal 3 extends, and the exterior bag Even if there is a slight gap between the opening edge 62 of the electrolyte 6, the electrolyte 5 that has flowed through the collector electrode 2 and the connection terminal 3 oozes out of the outer bag 6 through the gap. Can be prevented.
  • the surrounding portion 72 is in close contact with the surface of the connection terminal 3 via an adhesive 71 made of an epoxy resin having alkali resistance, the surrounding portion 72 is adhered by the electrolytic solution 5 that has entered the gap between the connection terminal 3 and the surrounding portion 72. Therefore, the electrolyte solution 5 is prevented from oozing out of the outer bag 6 through the gap.
  • FIG. 3 is a flowchart showing each step included in the method for manufacturing the polarizable electrode 1.
  • FIG. 4 is an explanatory diagram for explaining a forming step included in the method for manufacturing the polarizable electrode 1 and a method for manufacturing the electric double layer capacitor 100 after the forming step.
  • the method for manufacturing the polarizable electrode 1 includes a carbonization treatment step, a pulverization step, a selection step, an activation treatment step, and a molding step.
  • cleaning process is included as a preferable aspect.
  • the carbonization process is a process for producing carbide by carbonizing wood or tomato fruit. Specifically, for example, wood is installed in a carbonization furnace, the temperature inside the carbonization furnace is raised to 400 ° C. to 1200 ° C., held in that state for 5 minutes to 20 hours, and then cooled to room temperature, whereby charcoal is removed. Make it. The same applies to the production of tochino charcoal. In addition, as charcoal, it is also possible to use commercially available charcoal used in barbecue and the like. In this way, since inexpensive wood or tomato seeds are used as the raw material of the polarizable electrode 1, the manufacturing cost of the polarizable electrode 1 can be suppressed.
  • the pulverization step is a step of pulverizing the carbide produced in the carbonization treatment step to produce powdered carbide. Specifically, for example, the carbide is crushed into carbide pieces of about several centimeters cubic by impact with a hammer or the like, and then pulverized by a sand mill to produce powdered carbide.
  • the sorting step is a step of sorting out powdered carbides having a particle size of 1 mm or less among the powdered carbides produced by the pulverization step.
  • a powdered carbide having a particle size of 1 mm or less is selected by using a sieve having an opening size of 1 mm or less. That is, the powdered carbide falling from the sieve may be activated as a selected powdered carbide in the next step.
  • the particle size of the powdered activated carbon can be reduced to 1 mm or less.
  • the polarizable electrode 1 can be easily manufactured.
  • the particle size of the powdered carbide is too small, the powdered carbide is likely to be scattered in the air. For this reason, it is preferable to select powdered carbide having a particle size of 0.1 mm to 1 mm in the selection step.
  • a sieve having a mesh size of 0.1 mm or more and less than 1 mm may be used. And what is necessary is just to activate-activate by the next process as powdered carbide
  • the activation treatment step is a step of producing powdered activated carbon by activating the powdered carbide selected in the selection step.
  • an inert gas that is nitrogen gas, argon gas, or a mixture thereof
  • an aqueous solution that includes a potassium hydroxide aqueous solution, a sodium hydroxide aqueous solution, or a mixture thereof are prepared.
  • the aqueous solution is adsorbed on the powdered carbide, and then the powdered carbide adsorbed with the aqueous solution is heated in an inert gas atmosphere (for example, heated at a temperature of 700 to 1000 ° C. for 30 minutes to 2 hours).
  • an inert gas atmosphere for example, heated at a temperature of 700 to 1000 ° C. for 30 minutes to 2 hours.
  • the powdered carbide produced by pulverizing the carbide as in the present embodiment is activated to adsorb (impregnate) the aqueous solution to the powdered carbide in a short time. Therefore, the efficiency of the activation process can be increased.
  • the amount of the aqueous solution adsorbed on the powdered carbide is such that the weight of potassium hydroxide, sodium hydroxide or a mixture thereof in the aqueous solution is substantially the same as the weight of the powdered carbide in the dry state. It is preferable to do.
  • the ratio of the weight of potassium hydroxide or the like in the aqueous solution to the weight in the dry state of the powdered carbide is set to 1: 1 and activated at the temperature and time considered to be optimum. Assuming that the capacitance of the electric double layer capacitor 100 when processed is 80, the capacitance when the ratio is 1: 0.5 is 30, and the capacitance when the ratio is 1: 2.
  • the ratio is preferably set to approximately 1: 1.
  • the powdered activated carbon is preferably produced by an alkali activation treatment using an aqueous sodium hydroxide solution.
  • the sodium hydroxide aqueous solution is inexpensive, and as will be described later, by using a potassium hydroxide aqueous solution as the electrolytic solution 5, the capacitance of the electric double layer capacitor 100 is increased and the manufacturing cost can be suppressed.
  • the powdered activated carbon produced as described above has a particle size that is smaller than the particle size of the powdered carbide and is about 0.01 mm or more and 1 mm or less.
  • the washing step is a step of washing the powdered activated carbon produced by the activation treatment step before the molding step.
  • the washing step includes a step of immersing the powdered activated carbon in water of 10 ° C. or more and 85 ° C. or less for a predetermined time and a step of dehydrating the powdered activated carbon after the immersion.
  • powdered activated carbon is impregnated with water (wet with water) for cooling after activation treatment, and the mesh opening is less than 0.01 mm in a cleaning bag (such as a non-woven bag) To house.
  • the cleaning bag containing the powdered activated carbon is immersed in water at 10 ° C. or higher and 85 ° C. or lower for about one day. Thereafter, the washing bag is taken out of the water, and dehydrated for about 5 minutes using a washing machine dehydrator or the like to dehydrate the powdered activated carbon.
  • the forming step is a step in which powdered activated carbon produced by the activation treatment step and a predetermined liquid are mixed and formed into an electrode shape.
  • the manufacturing process of the electric double layer capacitor 100 after the molding process and the molding process will be specifically described with reference to FIG.
  • FIG. 4 is a diagram for explaining a molding process and a method for manufacturing the electric double layer capacitor 100 after the molding process.
  • a planar shape cruciform that wraps the mold 9 having a concave portion 91 having a rectangular shape in plan view (for example, 50 mm ⁇ 50 mm) and the powdered activated carbon 11 packed in the concave portion 91.
  • the separator 4 is prepared.
  • a notch 41 is formed in a part of the separator 4.
  • FIG. 4B the central portion of the separator 4 is inserted into the concave portion 91 of the mold 9.
  • FIG. 4A in the molding step, first, a planar shape cruciform that wraps the mold 9 having a concave portion 91 having a rectangular shape in plan view (for example, 50 mm ⁇ 50 mm) and the powdered activated carbon 11 packed in the concave portion 91.
  • the separator 4 is prepared.
  • a notch 41 is formed in a part of the separator 4.
  • the liquid to be mixed with the powdered activated carbon 11 is an aqueous electrolyte similar to the electrolyte 5 and is a potassium hydroxide aqueous solution having a concentration of 10 to 40% by weight or a sodium hydroxide aqueous solution having the same concentration range. It is preferred to use mixtures of these in the same concentration range.
  • a mold 20 having a convex portion 21 that fits into the concave portion 91 of the mold 9 is prepared, and as shown in FIG.
  • the mold 20 is positioned so as to be fitted into the concave portion 91 of the mold 9, and the mold 20 is pressed against the mold 9 with a load of several hundred kg to 2 tons using, for example, a hydraulic jack.
  • Activated carbon is formed into an electrode shape, and the polarizable electrode 1 is produced as shown in FIG. If the thickness of one polarizable electrode 1 is 15 mm or more (the thickness of the pair of polarizable electrodes 1 included in the electric double layer capacitor 100 is 30 mm) or more, the time required for charging increases drastically, and the internal resistance increases.
  • the liquid mixed with the powdered activated carbon 11 in the molding process can be used as it is as the electrolytic solution 5, it is also possible to add the electrolytic solution 5 to the polarizable electrode 1 produced as described above and impregnate it. It is.
  • the polarizable electrode 1 impregnated with the electrolytic solution 5 produced in the above molding step is taken out of the mold 9 together with the separator 4, and is shown in FIG. 4H.
  • the collector electrode 2 to which the connection terminal 3 is connected is overlaid on the upper surface of the polarizable electrode 1.
  • the base portion (the end portion on the collector electrode 2 side) of the connection terminal 3 is inserted into the notch 41 formed in the separator 4 so that the connection terminal 3 is positioned below the separator 4 as shown in FIG. To be located.
  • the separator 4 is folded so that the polarizable electrode 1 and the collector electrode 2 are wrapped with the separator 4, and the end of the separator 4 is fixed with the wax 42 so as to be polarizable.
  • the electrode 1, the collector electrode 2, and the separator 4 are fixed to each other (hereinafter, the laminated body of the polarizable electrode 1, the collector electrode 2, and the separator 4 fixed to each other is referred to as an electrode portion 30).
  • Electrode parts 30 (electrode parts 30a and 30b) prepared as described above are prepared, and the electrode part 30a and the electrode part 30b are overlapped as shown in FIG. At this time, the electrode portions 30a and 30b are overlapped so that the collector electrode 2, the polarizable electrode 1, the separator 4, the polarizable electrode 1 and the collector electrode 2 are laminated in this order.
  • the sealing auxiliary portion 7 is attached to the surface of the connection terminal 3 as described above.
  • FIG. 4 (l) (corresponding to FIG. 1 (b) described above), the electrode portions 30a and 30b are accommodated in the outer bag 6, and the opening edge of the outer bag 6 with the sealing auxiliary portion 7 interposed therebetween.
  • the electric double layer capacitor 100 is manufactured by sealing 62 by thermocompression bonding. Since the electrode portions 30a and 30b are merely overlapped and are not fixed, the electric double layer capacitor 100 is attached to a predetermined outer frame (see FIG. 5) so that the electrode portions 30a and 30b are not pressed and separated from each other. It is preferable to apply a pressing force from the outside of the outer bag 6 by, for example, fitting into the outer bag 6.
  • the electric double layer capacitor 100 manufactured as described above for example, the electric double layer capacitor in which the polarizable electrode 1 is made of powdered activated carbon 11 made of only wood
  • 1 cm 3 of the electric double layer capacitor 100 is used. Capacitance (around 1 cm 3 of the electrode portions 30a and 30b) was 28F.
  • the capacitance per 1 cm 3 of the electric double layer capacitor was about 15F.
  • the electric double layer capacitor 100 is compared with the case where the polarizable electrode is made of powdered activated carbon using only cotton as a raw material.
  • the capacitance of was increased about twice.
  • the electrostatic capacitance of each electric double layer capacitor was measured using the circuit shown in FIG.
  • the polarizable electrode 1 of the electric double layer capacitor 100 according to the present embodiment is made of powdered carbide having a particle size of 1 mm or less selected by the selection process, the particle size of the powdered activated carbon is also 1 mm or less.
  • the polarizable electrode 1 is made of powdered charcoal having a particle size of 1 mm or less. The capacitance per 1 cm 3 was 28F.
  • the capacitance per 1 cm 3 of the electric double layer capacitor is 22F. Decreased to the extent.
  • the electrostatic capacitance of each electric double layer capacitor was measured using the circuit shown in FIG.
  • the polarizable electrode 1 of the electric double layer capacitor 100 is produced by washing the powdered activated carbon produced by the activation treatment process before the molding process by the washing process.
  • the capacitance of the multilayer capacitor 100 is further increased.
  • the results of tests (Test 1, Test 2, and Test 3) for examining the difference in capacitance depending on the presence or absence of the cleaning process will be described.
  • FIG. 5 shows a circuit diagram for measuring the capacitance and internal resistance of the electric double layer capacitor.
  • the measurement circuit includes a constant voltage power supply Vd capable of setting a current limit, low resistances Rc and Rd of 0.1 ⁇ for current measurement, a discharge resistance RE of 10 ⁇ , a switch SW1, and It is comprised with the wiring containing SW2. Then, by turning on the switch SW1, the electric double layer capacitor 100 is connected to the constant voltage power supply Vd and charged. When the switch SW1 is turned off and the switch SW2 is turned on after the charging is completed, the electric double layer capacitor 100 is connected to the discharge resistor RE and discharges the stored charge.
  • ⁇ Test 1> An electric double layer capacitor 100 using the polarizable electrode 1 subjected to the cleaning process and an electric double layer capacitor 100 using the polarizable electrode 1 not subjected to the cleaning process are prepared, and these two electric double layer capacitors 100 are prepared.
  • the electrostatic capacity and the internal resistance were measured using the circuit shown in FIG.
  • the polarizable electrode 1 of the two electric double layer capacitors 100 performed the alkali activation using the potassium hydroxide aqueous solution in the activation treatment process.
  • FIG. 6 is a diagram showing the results of Test 1.
  • the “charcoal weight” shown in FIG. 6 means the weight of the powdered charcoal used to produce the polarizable electrode 1 in the dry state.
  • the “EDLC weight” means the weight of the electric double layer capacitor 100, specifically, the total weight of the electrode portions 30a and 30b constituting the electric double layer capacitor 100.
  • “EDLC thickness” means the thickness of the electric double layer capacitor 100, specifically, the total thickness of the electrode portions 30a and 30b.
  • the capacitance per gram of the electric double layer capacitor 100 is 8.20 F, and the internal resistance is 0.2. It became 275 ⁇ .
  • the capacitance per gram of the electric double layer capacitor 100 was 5.93 F, and the internal resistance was 0.301 ⁇ . .
  • the capacitance of the electric double layer capacitor 100 is increased by about 1.4 times by performing the cleaning process in the manufacturing process of the polarizable electrode 1.
  • Such a result is considered as one of the causes that a large amount of potassium hydroxide used in the activation treatment process remains in the powdered activated carbon 11 after the activation treatment. Therefore, in Test 2 described below, the concentration of the potassium hydroxide aqueous solution used as the electrolytic solution 5 is set to 34% by weight and 17% by weight, or water is used as the electrolytic solution 5 to Capacitance and internal resistance were evaluated.
  • ⁇ Test 2> Three electric double layer capacitors 100 each using the polarizable electrode 1 subjected to the cleaning step and using water, a potassium hydroxide aqueous solution having a concentration of 34% by weight, and a potassium hydroxide aqueous solution having a concentration of 17% by weight as the electrolyte 5; Three electric double layer capacitors 100 using the polarizable electrode 1 that has not been subjected to the cleaning process, and using water, a 34 wt% potassium hydroxide aqueous solution, and a 17 wt% potassium hydroxide aqueous solution as the electrolyte 5, respectively And the capacitance and internal resistance of these six electric double layer capacitors 100 were measured using the circuit shown in FIG. The polarizable electrodes 1 of the six electric double layer capacitors 100 were subjected to alkali activation using an aqueous potassium hydroxide solution in the activation treatment step.
  • FIG. 7 is a diagram showing the results of Test 2.
  • the meanings of “charcoal weight”, “EDLC weight” and “EDLC thickness” shown in FIG. 7 are the same as those shown in FIG.
  • the capacitance per 1 g of the electric double layer capacitor 100 is the case where water is used as the electrolytic solution 5. 4.63F, 7.20F when a 34 wt% potassium hydroxide aqueous solution is used as the electrolytic solution 5, and 6% when a 17 wt% potassium hydroxide aqueous solution is used as the electrolytic solution 5. It became .74F.
  • the capacitance per gram of the electric double layer capacitor 100 is 4.43 F when water is used as the electrolyte 5.
  • the potassium hydroxide aqueous solution having a concentration of 34 wt% is used as the electrolytic solution 5
  • 4.56 F is obtained
  • the potassium hydroxide aqueous solution having a concentration of 17 wt% is used as the electrolytic solution 5
  • 5.19 F is obtained. It was.
  • the capacitance of the electric double layer capacitor 100 is reduced as compared with the case where the polarizable electrode 1 that has been subjected to the cleaning process is used, and the electrolytic solution 5 is used. It was found that the capacitance was slightly increased by reducing the concentration of the aqueous potassium hydroxide solution from 34% by weight to 17% by weight.
  • the capacitance of the electric double layer capacitor 100 is reduced as compared with the case where the polarizable electrode 1 that has been subjected to the cleaning process is used.
  • the capacitance increases slightly, so that potassium carbonate (2KOH + CO 2 ⁇ K 2 CO 3 + H) generated in the activation treatment process is increased. It is considered that 2 O) remains in the polarizable electrode 1 like potassium hydroxide and acts as an impurity that inhibits increase in capacitance. Accordingly, in order to increase the capacitance of the electric double layer capacitor 100, it is effective to provide a cleaning step after the activation treatment step.
  • the two electric double layer capacitors 100 respectively using an aqueous potassium hydroxide solution and an aqueous sodium hydroxide solution as the electrolyte 5, and the polarizable electrode 1 not subjected to the cleaning process.
  • Two electric double layer capacitors 100 using an aqueous solution of potassium hydroxide and an aqueous solution of sodium hydroxide as the electrolyte 5 are prepared, and the capacitance and internal resistance of these four electric double layer capacitors 100 are shown in FIG. Measurements were made using the circuit shown.
  • the polarizable electrodes 1 of the four electric double layer capacitors 100 were subjected to alkali activation using a sodium hydroxide aqueous solution that was cheaper than the potassium hydroxide aqueous solution in the activation treatment step.
  • FIG. 8 is a diagram showing the results of Test 3.
  • the meanings of “charcoal weight”, “EDLC weight”, and “EDLC thickness” shown in FIG. 8 are the same as those shown in FIG. As shown in FIG. 8, even in the electric double layer capacitor 100 using the polarizable electrode 1 subjected to alkali activation using a sodium hydroxide aqueous solution, the polarizability subjected to alkali activation using a potassium hydroxide aqueous solution. Capacitance equivalent to that of the electric double layer capacitor 100 using the electrode 1 (the electric double layer capacitor 100 of Test 1 whose result is shown in FIG. 6 and the electric double layer capacitor 100 of Test 2 whose result is shown in FIG. 7) It turns out that it is obtained.
  • the activation treatment step an alkali activation treatment using a sodium hydroxide aqueous solution is performed, and if the potassium hydroxide aqueous solution is used as the electrolytic solution 5, the capacitance of the electric double layer capacitor 100 is increased and the manufacturing is performed. Costs can be suppressed.
  • test 4 results of a test (test 4) in which the electrostatic capacity of the electric double layer capacitor 100 using activated carbon made from tochi fruits are examined will be described.
  • ⁇ Test 4> After subjecting the activated carbon made from castanie fruit, which is a kind of tochi fruit, as a raw material, it was mixed with an aqueous sodium hydroxide solution to produce a polarizable electrode 1.
  • the capacitance and internal resistance of the electric double layer capacitor 100 provided with the polarizable electrode 1 were measured using the circuit shown in FIG.
  • the thickness of the electric double layer capacitor (total thickness of the electrode portions 30a and 30b shown in FIG. 4) was 12 mm, and the activated carbon thickness, which is the sum of the thicknesses of the pair of polarizable electrodes 1A, was 10.5 mm. Capacitance and internal resistance were measured for 5 cycles each and repeated twice.
  • FIG. 9 is a diagram showing the results of Test 4.
  • EDLC weight shown in FIG. 9 means the weight of the electric double layer capacitor 100, specifically, the total weight of the electrode portions 30a and 30b constituting the electric double layer capacitor 100.
  • EDLC thickness means the thickness of the electric double layer capacitor 100, specifically, the total thickness of the electrode portions 30a and 30b.
  • Activated carbon thickness means the thickness of activated carbon included in the electric double layer capacitor 100.
  • Capacitance means an average value of capacitance in the second five cycles of measurement.
  • Internal resistance means the average value of internal resistance in the second five cycles of measurement.
  • the electrostatic capacity per gram of the electric double layer capacitor 100 made from the castanie fruit produced in Test 4 is the static per gram of the electric double layer capacitor 100 made from the above-mentioned wood. It turns out that it becomes larger than the electric capacity.
  • the electric double layer capacitor 100A according to the second embodiment of the present invention is different from the polarizable electrode 1 of the electric double layer capacitor 100 according to the first embodiment only in the material for forming the polarizable electrode 1A, and the rest is the first embodiment. It is the same as the form. Accordingly, the following description will be made with appropriate reference to the drawings and symbols used in the first embodiment, and differences from the first embodiment will be mainly described, and description of the same points will be basically omitted.
  • the electric double layer capacitor 100A according to the present embodiment is the same as the electric double layer capacitor 100 shown in FIG. 1 except that “polarizable electrode 1” shown in FIG. 1 is replaced with “polarizable electrode 1A”.
  • the electric double layer capacitor 100A according to the present embodiment includes a pair of sheet-shaped polarizable electrodes 1A, a pair of sheet-shaped collector electrodes 2 interposed between the pair of polarizable electrodes 1A, and a pair of collector electrodes 2 A pair of sheet-like connection terminals 3 electrically connected to each other, a sheet-like separator 4 interposed between the pair of polarizable electrodes 1A and insulating between the pair of polarizable electrodes 1A, and a pair of separation terminals An electrolyte 5 impregnated in the polar electrode 1A, a pair of polarizable electrodes 1A, a pair of collector electrodes 2, a separator 4 and an exterior bag 6 that accommodates the electrolyte 5, and an
  • the electric double layer capacitor 100 ⁇ / b> A also includes a sealing auxiliary portion 7 attached to the surface of the connection terminal 3, and the opening 61 of the outer bag 6 has an opening edge 62 that forms the opening 61 as a sealing auxiliary. It is sealed by thermocompression bonding with the part 7 interposed therebetween.
  • the specific configuration of the sealing assisting portion 7 and the manufacturing method thereof are the same as those in the first embodiment shown in FIG.
  • the manufacturing method of the polarizable electrode 1A of the electric double layer capacitor 100A according to the present embodiment includes a carbonization treatment step, a pulverization step, an activation treatment step, and a molding step, as in the first embodiment. (See FIG. 3).
  • the selection process and the cleaning process included in the first embodiment are not necessarily required in the present embodiment.
  • the carbonization process of the present embodiment at least one of wood, bamboo, and rice husk is carbonized to produce a first carbide, and cotton is carbonized to produce a second carbide.
  • the first carbide and the second carbide produced by the carbonization treatment step are pulverized.
  • the 1st activated carbon and the 2nd activated carbon which were crushed by the crushing process are activated, respectively, and the 1st activated carbon and the 2nd activated carbon are produced.
  • the first activated carbon and the second activated carbon produced by the activation treatment process and a predetermined liquid are mixed and molded into an electrode shape. That is, the polarizable electrode 1A of the present embodiment includes a first carbide produced by carbonizing at least one of wood, bamboo, and rice husk, and a second carbide produced by carbonizing cotton.
  • the first activated carbon and the second activated carbon produced by activating the pulverized first carbide and second carbide, respectively, and a predetermined liquid are mixed and molded.
  • the specific contents of the molding process and the method for manufacturing the electric double layer capacitor 100A after the molding process in the present embodiment are the same as those in the first embodiment shown in FIG. 4 except that the first activated carbon and the second activated carbon are used. .
  • the electric double layer capacitor 100A since at least one of inexpensive wood, bamboo, and rice husk is used as a part of the raw material of the polarizable electrode 1A, the manufacturing cost can be suppressed. Further, since the first activated carbon made from wood or the like and not only the predetermined liquid but also the second activated carbon made from cotton are mixed, it becomes easy to form into an electrode shape, and the polarizable electrode 1A is simplified. Can be manufactured.
  • the polarizable electrode 1A preferably contains at least 5% by weight of the second activated carbon. Thereby, shaping
  • the capacitance and internal resistance of the electric double layer capacitor provided with this polarizable electrode were measured using the circuit shown in FIG.
  • the thickness of the electric double layer capacitor (total thickness of the electrode portions 30a and 30b shown in FIG. 4) was 10 mm, and the activated carbon thickness, which is the sum of the thicknesses of the pair of polarizable electrodes, was 8.5 mm. Capacitance and internal resistance were measured for 5 cycles each and repeated twice.
  • the capacitance and internal resistance of the electric double layer capacitor provided with this polarizable electrode were measured using the circuit shown in FIG.
  • the thickness of the electric double layer capacitor (total thickness of the electrode portions 30a and 30b shown in FIG. 4) was 10 mm, and the activated carbon thickness, which is the sum of the thicknesses of the pair of polarizable electrodes, was 8.5 mm. Capacitance and internal resistance were measured for 5 cycles each and repeated twice.
  • a polarizable electrode 1A is prepared by mixing a second activated carbon made of cotton towel as a raw material and a first activated carbon made of wood as a raw material at a weight ratio of 1: 1 in a dry state with a sodium hydroxide aqueous solution. did.
  • the capacitance and internal resistance of the electric double layer capacitor 100A provided with this polarizable electrode 1A were measured using the circuit shown in FIG.
  • the thickness of the electric double layer capacitor (total thickness of the electrode portions 30a and 30b shown in FIG. 4) was 12 mm, and the activated carbon thickness, which is the sum of the thicknesses of the pair of polarizable electrodes 1A, was 10.5 mm. Capacitance and internal resistance were measured for 5 cycles each and repeated twice.
  • a polarizable electrode 1A is prepared by mixing a second activated carbon made of cotton towel as a raw material and a first activated carbon made of bamboo as a raw material with a sodium hydroxide aqueous solution at a weight ratio of 1: 1 in a dry state. did.
  • the capacitance and internal resistance of the electric double layer capacitor 100A provided with this polarizable electrode 1A were measured using the circuit shown in FIG.
  • the thickness of the electric double layer capacitor (total thickness of the electrode portions 30a and 30b shown in FIG. 4) was 10 mm, and the activated carbon thickness that was the sum of the thicknesses of the pair of polarizable electrodes 1A was 8.5 mm. Capacitance and internal resistance were measured for 5 cycles each and repeated twice.
  • a second activated carbon made from cotton towels, a first activated carbon made from wood, and a first activated carbon made from rice husks are hydroxylated at a weight ratio of 45:10:45 in a dry state.
  • a polar electrode 1A was prepared by mixing with an aqueous sodium solution. The capacitance and internal resistance of the electric double layer capacitor 100A provided with this polarizable electrode 1A were measured using the circuit shown in FIG. The thickness of the electric double layer capacitor (total thickness of the electrode portions 30a and 30b shown in FIG. 4) was 10 mm, and the activated carbon thickness that was the sum of the thicknesses of the pair of polarizable electrodes 1A was 8.5 mm. Capacitance and internal resistance were measured for 5 cycles each and repeated twice.
  • Example 4 The second activated carbon made from cotton towels, the first activated carbon made from wood, and the first activated carbon made from rice husks are hydroxylated at a weight ratio of 25:50:25 in a dry state.
  • a polar electrode 1A was prepared by mixing with an aqueous sodium solution.
  • the capacitance and internal resistance of the electric double layer capacitor 100A provided with this polarizable electrode 1A were measured using the circuit shown in FIG.
  • the thickness of the electric double layer capacitor (total thickness of the electrode portions 30a and 30b shown in FIG. 4) was 14 mm, and the activated carbon thickness, which is the sum of the thicknesses of the pair of polarizable electrodes 1A, was 12.5 mm. Capacitance and internal resistance were measured for 5 cycles each and repeated twice.
  • FIG. 10 is a diagram showing the results of Examples 1 to 4 and Comparative Examples 1 and 2 described above.
  • “EDLC weight” shown in FIG. 10 means the weight of the electric double layer capacitor 100A, specifically the total weight of the electrode portions 30a and 30b constituting the electric double layer capacitor 100A.
  • EDLC thickness means the thickness of the electric double layer capacitor 100A, specifically, the total thickness of the electrode portions 30a and 30b.
  • Activated carbon thickness means the total thickness of the first activated carbon and the second activated carbon included in the electric double layer capacitor 100A.
  • Capacitance means an average value of capacitance in the second five cycles of measurement.
  • “Internal resistance” means the average value of internal resistance in the second five cycles of measurement. As shown in FIG.
  • the capacitance per gram of the electric double layer capacitors 100A according to Examples 1 to 4 is approximately the same as the capacitance per gram of the electric double layer capacitors according to Comparative Examples 1 and 2.
  • a second activated carbon made from cotton towels, a first activated carbon made from wood, and a first activated carbon made from rice husks in a dry weight ratio of 25:50:25 is preferred.
  • the capacitance is improved as compared with the electric double layer capacitor according to Comparative Example 1 using only the second activated carbon using a cotton towel as a raw material.
  • the ratio of the second activated carbon using cotton as a raw material does not necessarily need to be 25% by weight as in Example 4, and if it is included at least 5% by weight, Sufficient capacitance can be obtained and molding into an electrode shape is easy.

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  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Microelectronics & Electronic Packaging (AREA)
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  • Chemical Kinetics & Catalysis (AREA)
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  • Electric Double-Layer Capacitors Or The Like (AREA)

Abstract

L'invention concerne une électrode polarisable pour condensateurs électriques à double couche, pouvant être produite facilement, avec un coût de production réduit ; et analogue. L'invention concerne également un condensateur électrique à double couche (100) comprenant : une paire d'électrodes polarisables (1) qui sont obtenues par moulage d'un mélange obtenu par mélange d'un liquide prédéterminé avec un charbon actif en poudre produit par activation d'un charbon en poudre qui est constitué de bois et présente un diamètre de particules de 1 mm ou inférieur ; une paire d'électrodes collectrices (2) entre lesquelles est insérée la paire d'électrodes polarisables ; une paire de bornes de raccordement (3) qui sont respectivement raccordées électriquement à la paire d'électrodes collectrices ; un séparateur (4) qui est inséré entre la paire d'électrodes polarisables et isole lesdites électrodes l'une de l'autre ; une solution d'électrolyte (5) dont est imprégnée la paire d'électrodes polarisables ; et une poche d'emballage externe (6) qui contient la paire d'électrodes polarisables, la paire d'électrodes collectrices, le séparateur et la solution d'électrolyte. Une ouverture (61) dans la poche d'emballage externe est fermée hermétiquement, tandis qu'une partie de chaque bornes de raccordement est maintenue découverte à l'extérieur de la poche.
PCT/JP2015/069271 2014-07-04 2015-07-03 Procédé de production d'électrode polarisable pour condensateurs électriques à double couche, électrode polarisable pour condensateurs électriques à double couche et condensateur électrique à double couche WO2016002930A1 (fr)

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JP2014138749A JP6558725B2 (ja) 2014-07-04 2014-07-04 電気二重層キャパシタ用分極性電極の製造方法及び、電気二重層キャパシタ
JP2014-138749 2014-07-04
JP2015035120A JP6630982B2 (ja) 2015-02-25 2015-02-25 電気二重層キャパシタ用分極性電極の製造方法
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CN113314353A (zh) * 2021-03-12 2021-08-27 浙江省林业科学研究院 基于毛竹生物活性炭电极的可降解超级电容器

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Publication number Priority date Publication date Assignee Title
JPS60149116A (ja) * 1984-01-13 1985-08-06 松下電器産業株式会社 電気二重層キャパシタ
JPH06267794A (ja) * 1993-03-12 1994-09-22 Morinobu Endo 分極性電極材の製造方法
JPH08138978A (ja) * 1994-11-02 1996-05-31 Japan Gore Tex Inc 電気二重層コンデンサとその電極の製造方法
JPH11224834A (ja) * 1998-02-05 1999-08-17 Nec Corp 分極性電極、その製造方法、及びその分極性電極を用いた電気二重層コンデンサ
JP2001057182A (ja) * 1999-08-20 2001-02-27 Tdk Corp 電気化学デバイス及びその製造方法
JP2010215474A (ja) * 2009-03-18 2010-09-30 Kansai Coke & Chem Co Ltd 活性炭の製造方法および該製造方法により得られた活性炭を用いた電気二重層キャパシタ

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60149116A (ja) * 1984-01-13 1985-08-06 松下電器産業株式会社 電気二重層キャパシタ
JPH06267794A (ja) * 1993-03-12 1994-09-22 Morinobu Endo 分極性電極材の製造方法
JPH08138978A (ja) * 1994-11-02 1996-05-31 Japan Gore Tex Inc 電気二重層コンデンサとその電極の製造方法
JPH11224834A (ja) * 1998-02-05 1999-08-17 Nec Corp 分極性電極、その製造方法、及びその分極性電極を用いた電気二重層コンデンサ
JP2001057182A (ja) * 1999-08-20 2001-02-27 Tdk Corp 電気化学デバイス及びその製造方法
JP2010215474A (ja) * 2009-03-18 2010-09-30 Kansai Coke & Chem Co Ltd 活性炭の製造方法および該製造方法により得られた活性炭を用いた電気二重層キャパシタ

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113314353A (zh) * 2021-03-12 2021-08-27 浙江省林业科学研究院 基于毛竹生物活性炭电极的可降解超级电容器

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