Classifications

• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
  • H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
  • H01G9/15—Solid electrolytic capacitors
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
  • H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
  • H01G9/15—Solid electrolytic capacitors
  • H01G9/151—Solid electrolytic capacitors with wound foil electrodes
• • 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
  • H01G11/78—Cases; Housings; Encapsulations; Mountings
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
  • H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
  • H01G9/004—Details
  • H01G9/022—Electrolytes; Absorbents
  • H01G9/025—Solid electrolytes
  • H01G9/028—Organic semiconducting electrolytes, e.g. TCNQ
• • 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 manufacturing a solid electrolytic condenser in which an anode foil and a cathode foil are wound.
• FIG. 2 is a cross-sectional front view of a conventional solid electrolytic capacitor (1)
• FIG. 1 is a perspective view of a conventional capacitor element (2) (for example, Japanese Patent Publication No. 4-1966). 95 No. 5).
• a capacitor element (2) is housed in an aluminum case (3) having an open upper surface, and the opening of the case (3) is sealed with a rubber packing (30).
• the upper end of the case (3) is curled to fix the packing (30), and a plastic seat plate (31) is attached to the upper surface of the case (3).
• the lead wires (21, 21) extending from the capacitor element (2) penetrate the packing (30) and the seat plate (31) and are bent sideways.
• the capacitor element (2) consists of an anode foil (4), which is an aluminum foil on which a dielectric oxide film is formed, and a cathode foil (5), which is an aluminum foil. It is wound up in a roll through the separator (6). A conductive polymer layer is formed inside the capacitor element (2). A pair of lead tabs (25) (25) are drawn out from the anode foil (4) and the cathode foil (5), and the lead wires (21) (21) extend from the lead tabs (25) (25). .
• the procedure for forming the conductive polymer layer in the capacitor element (2) is described below. First, the polymer material that is thiophene is replaced with ethyl alcohol Dissolve in alcohol solvent and add an oxidizing agent such as a metal salt.
• the element (2) is immersed in the solvent.
• a thermal polymerization reaction occurs at about 300 ° C. at room temperature to form a conductive polymer layer in the capacitor element (2).
• the polymer has conductivity because the anion of the oxidizing agent is taken in as a dopant in the polymer structure to form a hole.
• solid electrolytic capacitors using polythiophene as a conductive polymer are well known (see, for example, Japanese Patent Laid-Open Publication No. 2-15611), pyrrole and aniline are used as polymer materials. May be used.
• an electrolyte using polyethylene dioxythiophene as an electrolyte and ferric P-toluenesulfonate as an oxidizing agent for example, Japanese Patent Publication No. 9-293636). reference). Since the polymerization reaction rate of polyethylenedioxythiophene is slow, an electrolyte layer made of a uniform conductive polymer is formed in the capacitor element (2).
• An object of the present invention is to provide a capacitor having a lower ESR.
• the method for producing a solid electrolytic condenser comprises: a step of mixing a metal salt of an alkoxybenzene sulfonic acid or an alkyl sulfonic acid with an oxidizing agent together with a conductive polymer material in a solvent; ) To form a conductive polymer layer in the capacitor element (2) by a thermal polymerization reaction. The process of forming.
• Figure 1 is a perspective view of a conventional capacitor element
• FIG. 2 is a cross-sectional front view of a conventional solid electrolytic capacitor.
• the capacitor element (2) is composed of an anode foil (4), which is an aluminum foil with a chemical conversion film formed thereon, and a cathode foil (5), which is an aluminum foil. It is wound into a roll through the night (6) and stopped with tape (26).
• a conductive polymer layer is formed inside the capacitor element (2). Examples of the conductive polymer include polythiophene, polypyrrole, and polyaniline. In this example, a thiophene-based polymer is exemplified.
• a pair of lead wires (21) (21) extend from the capacitor element (2).
• the solid electrolytic capacitor (1) is formed by the following procedure. Since the anode foil (4) is made by cutting out from an aluminum sheet, a dielectric oxide film is not formed on the end face of the anode foil (4). Therefore, first, the capacitor element (2) is cut and formed, and a dielectric oxide film is formed on the end face of the anode foil (4). Thereafter, the winding element (20) is heat-treated at 280 ° C. to stabilize the characteristics of the dielectric oxide film.
• the capacitor element (2) is immersed in a mixed solution of 3,4-ethylenedioxythiophene containing ethyl alcohol as a diluent and a metal salt serving as an oxidizing agent.
• a thermal polymerization reaction is caused at a room temperature of about 300 ° C. to form a conductive polymer layer in the capacitor element (2), thereby completing the capacitor element (2).
• the capacitor element (2) is sealed in the case (3), and the solid electrolytic capacitor (1) is Complete.
• alkoxy (C nH 2n + 1 ⁇ I) benzenesulfonic acid, or an alkyl - is particularly characterized with sulfonic acid metal salt (C nH 2 n +1).
• Methoxybenzenesulfonic acid was used as alkoxybenzenesulfonic acid, and methanesulfonic acid was used as alkylsulfonic acid.
• Table 1 shows the oxidizing agents used in the conventional example and Example 123.
• a capacitor element (2) was prepared using ferric p-toluenesulfonate as an oxidizing agent.
• a capacitor element (2) was prepared using only ferric iron sulfonate as an oxidizing agent.
• a capacitor element (2) was prepared using a mixture of ferric p-toluenesulfonate and ferric methanesulfonate as an oxidizing agent.
• a capacitor element (2) was prepared using a mixture of ferric methoxybenzenesulfonate and ferric methanesulfonate as an oxidizing agent.
• Each type of capacitor element (2) was placed in a case (3) and sealed to form a solid electrolytic capacitor (1).
• the solvent is ethyl alcohol
• the conductive polymer is 3,4-ethylenedioxythiophene.
• Each of the capacitors (1) is a capacitor with a rated voltage of 4 V, a capacitance of 150 X F, and the outer dimensions of the case (3) are 6.3 mm in diameter and 6.0 mm in height.
• Example 3 1 5 1 1 5 As shown in Table 2 above, when the capacitor element (2) is manufactured by the method of this example, the ESR can be improved without lowering the capacitance. Came.
• a metal salt of an alkoxybenzenesulfonic acid such as methoxybenzenesulfonic acid or a metal salt of an alkylsulfonic acid such as methanesulfonic acid is used.
• the use of a mixture of metal salts of aromatic sulfonic acids increases the acidity of the oxidizing agent solution.
• the anion of the oxidizing agent is easily incorporated as a dopant into the polymer structure, thereby increasing the efficiency of polymerization of the conductive polymer and increasing the filling rate of the conductive polymer in the capacitor element (2). It is thought that it did.
• the alkoxybenzenesulfonic acid includes not only methoxybenzenesulfonic acid but also ethoxybenzenesulfonic acid and butoxybenzenesulfonic acid.
• Alkyl sulfonic acids include ethane sulfonic acid, propane sulfonic acid, and butane sulfonic acid as well as methane sulfonic acid.
• heat resistance and thermal stability are improved, and characteristics tend to be stable.
• ferrite, copper, chromium, cerium, manganese, and zinc are included in the transition metals that constitute the metal salt.
• the capacitor element (2) is formed by winding the anode foil (4) and the cathode foil (5).
• the capacitor element (2) may be formed of a sintered body of valve metal or a laminated structure of a plate material.
• the valve metal is a metal that forms an oxide film on the surface, such as aluminum, tantalum, and niobium.
• the upper opening of the case (3) may be closed with epoxy resin.
• the shape of the capacitor may be a radial lead type. -Industrial applicability.
• the acidity of an oxidizing agent solution is increased by using a metal salt of an alkoxybenzene sulfonic acid or a metal salt of an alkyl sulfonic acid, rather than using only a metal salt of an aromatic sulfonic acid such as toluenesulfonic acid as an oxidizing agent. .
• the anion of the oxidizing agent is easily incorporated as a dopant into the polymer structure, so that the polymerization efficiency of the conductive polymer is increased, and the filling rate of the conductive polymer in the capacitor element (2) is increased. It is thought that it did. Therefore, it is presumed that the electrolyte is sufficiently dense and uniform inside the capacitor element (2).

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• Engineering & Computer Science (AREA)
• Power Engineering (AREA)
• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Electrochemistry (AREA)
• Microelectronics & Electronic Packaging (AREA)
• Polyoxymethylene Polymers And Polymers With Carbon-To-Carbon Bonds (AREA)

Priority Applications (2)

Applications Claiming Priority (2)

Publications (1)

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• 2003
  • 2003-02-13 JP JP2003034737A patent/JP2004265927A/ja active Pending
• 2004
  • 2004-02-02 KR KR1020057014874A patent/KR20050104370A/ko not_active Ceased
  • 2004-02-02 US US10/541,873 patent/US7374585B2/en not_active Expired - Fee Related
  • 2004-02-02 CN CNB2004800005141A patent/CN100481285C/zh not_active Expired - Fee Related
  • 2004-02-02 WO PCT/JP2004/001014 patent/WO2004072999A1/ja not_active Ceased
  • 2004-02-02 DE DE112004000281T patent/DE112004000281T5/de not_active Withdrawn
  • 2004-05-31 TW TW093115467A patent/TWI244102B/zh not_active IP Right Cessation

Patent Citations (1)

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