WO2024143419A1 - 固体電解コンデンサおよびその製造方法 - Google Patents

固体電解コンデンサおよびその製造方法 Download PDF

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Publication number
WO2024143419A1
WO2024143419A1 PCT/JP2023/046795 JP2023046795W WO2024143419A1 WO 2024143419 A1 WO2024143419 A1 WO 2024143419A1 JP 2023046795 W JP2023046795 W JP 2023046795W WO 2024143419 A1 WO2024143419 A1 WO 2024143419A1
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Prior art keywords
solid electrolyte
electrolyte layer
conductive polymer
anode
layer
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Ceased
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PCT/JP2023/046795
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English (en)
French (fr)
Japanese (ja)
Inventor
隆則 村中
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Panasonic Intellectual Property Management Co Ltd
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Panasonic Intellectual Property Management Co Ltd
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Priority to JP2024567892A priority Critical patent/JPWO2024143419A1/ja
Publication of WO2024143419A1 publication Critical patent/WO2024143419A1/ja
Anticipated expiration legal-status Critical
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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
    • H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
    • 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
    • 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

Definitions

  • This disclosure relates to a solid electrolytic capacitor and a method for manufacturing the same.
  • a solid electrolytic capacitor includes a solid electrolyte layer formed on a dielectric layer.
  • Various solid electrolyte layers and methods for forming them have been proposed.
  • Patent document 1 JP Patent Publication 2001-102255 A describes claim 1 of a tantalum solid electrolytic capacitor in which "an anode body is formed by sintering a compact of tantalum powder in which an anode lead wire is embedded with one end exposed, and is laminated with a dielectric oxide film layer, a layer containing a conductive polymer made of polystyrene sulfonic acid and its derivatives, and a chemically polymerizable conductive polymer layer formed by impregnating the anode body with a solution containing a heterocyclic monomer and a solution containing an oxidizer individually, or with a mixed liquid containing a heterocyclic monomer and an oxidizer.”
  • Claim 1 of Patent Document 3 describes an electrolytic capacitor including a capacitor element having an anode body having a plurality of holes on its surface, a dielectric film formed on the surface of the anode body, and a cathode body formed on the dielectric film, the cathode body including a conductive solid layer, the conductive solid layer being a layer including conductive solid particles and/or aggregates thereof formed using a dispersion including conductive solid particles and/or aggregates thereof and a solvent, the conductive solid particles and/or aggregates thereof contained in the dispersion having a first particle size distribution peak and a second particle size distribution peak satisfying the following formula (1) in particle size distribution measurement by a dynamic laser light scattering method.
  • ⁇ 1> ⁇ 2 (1)
  • [In formula (1), ⁇ 1 and ⁇ 2 represent the average particle diameters of the first and second particle diameter distribution peaks, respectively.]" is described.
  • Claim 1 of Patent Document 4 (WO 2022/220235) describes an "electrolytic capacitor comprising an anode body, a dielectric layer covering the anode body, a first solid electrolyte layer covering the dielectric layer, and a second solid electrolyte layer covering the first solid electrolyte layer, the first solid electrolyte layer including a first conductive polymer having a polythiophene skeleton, the second solid electrolyte layer including a second conductive polymer having a polypyrrole skeleton, and the conductivity of the first solid electrolyte layer being 2 S/cm or less.”
  • the porous portion of the surface of the anode body has minute pores (pits). With conventional manufacturing methods, it has been difficult to form a solid electrolyte layer deep within the pores.
  • One of the purposes of this disclosure is to improve the problems with conventional solid electrolytic capacitors and their manufacturing methods, and to provide a solid electrolytic capacitor with superior characteristics.
  • the electrolytic capacitor includes an anode-side member including an anode body having a porous surface and a dielectric layer formed on the porous surface, and a solid electrolyte layer, the anode-side member having a porous portion formed on the surface by the anode body and the dielectric layer, the solid electrolyte layer includes a first solid electrolyte layer formed on the dielectric layer and containing a first conductive polymer, and a second solid electrolyte layer formed on the first solid electrolyte layer and containing a second conductive polymer, the first solid electrolyte layer is a layer formed using a dispersion liquid in which particles of the first conductive polymer are dispersed, the second solid electrolyte layer contains an oxidizing agent and/or a residue of the oxidizing agent, the average particle size of the particles is smaller than the average pore size of the porous portion, and the ratio ⁇ 1/ ⁇ 2 of the conductivity ⁇ 1
  • the solid electrolytic capacitor according to the present embodiment may be referred to as a solid electrolytic capacitor (S) below.
  • the solid electrolytic capacitor (S) includes an anode-side member including an anode body having a porous surface and a dielectric layer formed on the porous surface, and a solid electrolyte layer.
  • the anode-side member has a porous portion formed by the anode body and the dielectric layer on its surface.
  • the solid electrolyte layer includes a first solid electrolyte layer formed on the dielectric layer and containing a first conductive polymer, and a second solid electrolyte layer formed on the first solid electrolyte layer and containing a second conductive polymer.
  • the first solid electrolyte layer is a layer formed using a dispersion liquid in which particles of the first conductive polymer are dispersed.
  • the particles may be referred to as "particles (P)" below.
  • the second solid electrolyte layer includes an oxidizing agent and/or a residue of the oxidizing agent. That is, the second solid electrolyte layer includes at least one of an oxidizing agent and a residue of the oxidizing agent.
  • the average particle diameter Dp of the particles (P) is smaller than the average pore diameter Sp of the porous portion.
  • the ratio ⁇ 1/ ⁇ 2 of the electrical conductivity ⁇ 1 of the first solid electrolyte layer to the electrical conductivity ⁇ 2 of the second solid electrolyte layer is 0.1 or less.
  • the first solid electrolyte layer of the solid electrolytic capacitor (S) is formed using a dispersion of particles (P) whose average particle size Dp is smaller than the average pore size Sp of the porous part, so that a sufficient solid electrolyte layer can be formed in the pores of the porous part.
  • the electrolyte layer can then be formed by chemical polymerization using a polymerization solution with a high concentration of oxidizing agent. As a result, the capacity extraction property is improved and a low equivalent series resistance (ESR) can be achieved. Furthermore, in the solid electrolytic capacitor (S), the first solid electrolyte layer is formed and then the second solid electrolyte layer is formed by chemical polymerization. Therefore, it is possible to prevent the polymerization solution used in forming the second solid electrolyte layer from coming into contact with the dielectric layer. As a result, it is possible to prevent the dielectric layer from being damaged by substances (high boiling point solvent, oxidizing agent, oxidizing agent residue, etc.) contained in the polymerization solution of the chemical polymerization.
  • substances high boiling point solvent, oxidizing agent, oxidizing agent residue, etc.
  • the first conductive polymer and the second conductive polymer are different.
  • the first conductive polymer is poly(3,4-ethylenedioxythiophene) (PEDOT) doped with polystyrene sulfonate (PSS), and the second conductive polymer is polythiophene.
  • PEDOT poly(3,4-ethylenedioxythiophene)
  • PSS polystyrene sulfonate
  • the second conductive polymer is polythiophene.
  • the solid electrolytic capacitor (S) includes a capacitor element.
  • An example of a capacitor element includes an anode side member (anode foil with a dielectric layer formed thereon), a cathode foil, a separator, and a solid electrolyte layer (first and second solid electrolyte layers).
  • the separator is disposed between the anode side member and the cathode foil.
  • the anode side member, the cathode foil, and the separator form a laminate.
  • An example of a laminate is the wound body described above.
  • the solid electrolytic capacitor 100 includes a capacitor element 10, a bottomed case 101, a sealing member 102, a seat plate 103, lead wires 104A and 104B, and lead tabs 105A and 105B.
  • the bottomed case 101 houses the capacitor element 10.
  • the sealing member 102 covers the opening of the bottomed case 101.
  • the seat plate 103 covers the sealing member 102.
  • the lead wires 104A and 104B pass through the seat plate 103.
  • the lead tab 105A connects the lead wire 104A to the anode foil of the capacitor element 10.
  • the lead tab 105B connects the lead wire 104B to the cathode foil of the capacitor element 10.
  • the vicinity of the open end of the bottomed case 101 is drawn inward.
  • the open end of the bottomed case 101 is curled to crimp the sealing member 102.
  • the capacitor element 10 is a wound body.
  • the capacitor element 10 is formed by winding the anode side member 11, the cathode foil 12, and the separator 13 so that the separator 13 is disposed between the anode side member 11 and the cathode foil 12.
  • the outermost circumference of the wound body is fixed with tape 14.
  • the anode side member 11 includes an anode foil and a dielectric layer formed on the surface of the anode foil.
  • the anode side member 11 has a porous portion on its surface.
  • a first solid electrolyte layer and a second solid electrolyte layer are laminated on the anode side member 11 (on the dielectric layer). Note that the solid electrolyte layers are not shown in FIG. 2.
  • Capacitor A1 The capacitor A1 was produced by the following method. First, an aluminum etched foil was subjected to a chemical conversion treatment to form a dielectric layer on the surface of the aluminum foil. This resulted in an anode-side member including an anode body having a porous surface and a dielectric layer formed on the porous surface. The average pore diameter of the porous portion present on the surface of the anode-side member was measured and found to be 145 nm. Next, leads were connected to each of the anode-side member and the cathode foil (aluminum foil). Next, the anode-side member, the cathode foil, and the separator were wound to form a wound body.
  • Capacitors A2 to A3 and C1 to C6 were produced in the same manner and under the same conditions as those for the production of capacitor A1, except that the average pore diameter Sp of the porous portion and the conditions for forming the solid electrolyte layer were changed as shown in Table 1.
  • the average pore diameter Sp of the porous portion was changed by changing the chemical formation voltage when forming the dielectric layer. Specifically, when the average pore diameter Sp was to be reduced, the chemical formation voltage was increased.
  • the solid electrolyte layers of capacitors C1 to C3 were formed only by chemical polymerization.

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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)
  • Electric Double-Layer Capacitors Or The Like (AREA)
PCT/JP2023/046795 2022-12-28 2023-12-26 固体電解コンデンサおよびその製造方法 Ceased WO2024143419A1 (ja)

Priority Applications (1)

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JP2024567892A JPWO2024143419A1 (https=) 2022-12-28 2023-12-26

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2022-211696 2022-12-28
JP2022211696 2022-12-28

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WO2024143419A1 true WO2024143419A1 (ja) 2024-07-04

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003173932A (ja) * 2001-12-06 2003-06-20 Matsushita Electric Ind Co Ltd 固体コンデンサおよびその製造方法
JP2004103748A (ja) * 2002-09-09 2004-04-02 Fujitsu Media Device Kk 固体電解コンデンサの製造方法
JP2012015425A (ja) * 2010-07-05 2012-01-19 Nec Tokin Corp 固体電解コンデンサとその製造方法
WO2016174818A1 (ja) * 2015-04-28 2016-11-03 パナソニックＩｐマネジメント株式会社 電解コンデンサおよびその製造方法
WO2022220235A1 (ja) * 2021-04-15 2022-10-20 パナソニックＩｐマネジメント株式会社 電解コンデンサおよびその製造方法

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003173932A (ja) * 2001-12-06 2003-06-20 Matsushita Electric Ind Co Ltd 固体コンデンサおよびその製造方法
JP2004103748A (ja) * 2002-09-09 2004-04-02 Fujitsu Media Device Kk 固体電解コンデンサの製造方法
JP2012015425A (ja) * 2010-07-05 2012-01-19 Nec Tokin Corp 固体電解コンデンサとその製造方法
WO2016174818A1 (ja) * 2015-04-28 2016-11-03 パナソニックＩｐマネジメント株式会社 電解コンデンサおよびその製造方法
WO2022220235A1 (ja) * 2021-04-15 2022-10-20 パナソニックＩｐマネジメント株式会社 電解コンデンサおよびその製造方法

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