WO2022168769A1 - 電解コンデンサ及び電解コンデンサの製造方法 - Google Patents
電解コンデンサ及び電解コンデンサの製造方法 Download PDFInfo
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- WO2022168769A1 WO2022168769A1 PCT/JP2022/003492 JP2022003492W WO2022168769A1 WO 2022168769 A1 WO2022168769 A1 WO 2022168769A1 JP 2022003492 W JP2022003492 W JP 2022003492W WO 2022168769 A1 WO2022168769 A1 WO 2022168769A1
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- resin
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Images
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
- H01G9/004—Details
- H01G9/008—Terminals
- H01G9/012—Terminals specially adapted for solid 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
- H01G9/0029—Processes of 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
- H01G9/08—Housing; Encapsulation
- H01G9/10—Sealing, e.g. of lead-in wires
-
- 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
- H01G9/26—Structural combinations of electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices with each other
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/002—Details
- H01G4/228—Terminals
- H01G4/232—Terminals electrically connecting two or more layers of a stacked or rolled capacitor
- H01G4/2325—Terminals electrically connecting two or more layers of a stacked or rolled capacitor characterised by the material of the terminals
-
- 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
- H01G9/08—Housing; Encapsulation
Definitions
- the present invention relates to an electrolytic capacitor and a method for manufacturing an electrolytic capacitor.
- Patent Document 1 discloses a chip capacitor.
- a metal film extending along the exposed surface is formed by plating on the exposed portion where the internal electrode provided inside the chip substrate is exposed, and then a conductive resin paste is applied to the exposed surface. form side electrodes.
- Patent Document 2 discloses a solid electrolytic capacitor.
- part of the anode body is exposed to the outside of the sealing body, the exposed portion is covered with a plating layer, and is electrically connected to the anode conductive elastic body via the plating layer. It is disclosed that there are
- JP 2007-073883 A Japanese Patent No. 3276113
- the metal layer of the electrode exposed portion is a plated layer formed by plating, and a resin electrode layer is provided on the plated layer to achieve a low ESR (equivalent series resistance ) and high reliability.
- the plated layer formed on the electrode exposed portion is formed with a uniform thickness on the exposed portion, there is a problem that the adhesion area with the resin electrode layer is insufficient, and the ESR cannot be sufficiently lowered. .
- the bonding strength between the plating layer and the resin electrode layer is weak, there is a problem in the terminal fixing strength when the electronic component is mounted.
- an object of the present invention is to provide an electrolytic capacitor capable of sufficiently reducing ESR and having high terminal fixing strength, and a method for manufacturing the electrolytic capacitor.
- the electrolytic capacitor of the present invention comprises: a resin molding comprising a laminate including a capacitor element and a sealing resin for sealing the periphery of the laminate; and an anode external electrode and a cathode provided on the outer surface of the resin molding. and external electrodes, wherein the capacitor element has a core portion and a porous portion formed along the surface thereof, and an end portion thereof is exposed to the outer surface of the resin molded body.
- a valve action metal base a dielectric layer formed on the porous portion, a solid electrolyte layer formed on the dielectric layer, a conductive layer formed on the solid electrolyte layer, wherein the cathode external electrode is electrically connected to the conductive layer, and the anode external electrode comprises a first electrode layer in direct contact with the core portion and the porous portion of the valve metal substrate;
- the thickness of the first electrode layer in the normal direction to the outer surface of the valve action metal substrate is equal to the thickness of the portion formed in the core portion of the valve action metal substrate formed in the porous portion of the valve action metal substrate. characterized by being thicker than the thickness of
- the method for manufacturing an electrolytic capacitor of the present invention is characterized by forming the first electrode layer on the outer surface of the resin molding by an aerosol deposition method.
- an electrolytic capacitor with sufficiently low ESR and high terminal fixing strength, and a method for manufacturing the electrolytic capacitor.
- FIG. 1 is a perspective view schematically showing one example of the electrolytic capacitor of the present invention.
- FIG. 2 is a cross-sectional view of the electrolytic capacitor shown in FIG. 1 taken along the line AA.
- FIG. 3 is a cross-sectional view schematically showing the vicinity of the valve action metal substrate on the first end face of the resin molded body.
- FIG. 4 is a cross-sectional view schematically showing the vicinity of the cathode extraction layer on the second end face of the resin molded body.
- FIG. 5 is a cross-sectional view schematically showing another example of the electrolytic capacitor of the present invention.
- FIG. 6 is a cross-sectional view schematically showing an example of a resin molding.
- FIG. 7 is a schematic diagram showing a step of forming the first electrode layer by an aerosol deposition method.
- 8 is a cross-sectional observation photograph of the vicinity of the anode-side end face of the electrolytic capacitor of Example 3.
- FIG. 3 is a cross-sectional view schematic
- the electrolytic capacitor and the method for manufacturing the electrolytic capacitor of the present invention will be described below.
- the present invention is not limited to the following configurations, and can be appropriately modified and applied without changing the gist of the present invention.
- a combination of two or more desirable configurations of the embodiments of the present invention described below is also the present invention.
- FIG. 1 is a perspective view schematically showing one example of the electrolytic capacitor of the present invention.
- FIG. 1 shows a resin molding 9 that constitutes the electrolytic capacitor 1.
- the shape of the resin molding constituting the electrolytic capacitor of the present invention is not particularly limited, and any three-dimensional shape can be adopted.
- the shape of the resin molding is preferably rectangular parallelepiped.
- the term "rectangular parallelepiped" does not mean a perfect rectangular parallelepiped. It may be in a shape that is
- FIG. 1 shows a rectangular parallelepiped resin molded body 9, and the resin molded body 9 has a length direction (L direction), a width direction (W direction), and a thickness direction (T direction). .
- the resin molding 9 has, as its outer surface, a first end face 9a and a second end face 9b facing each other in the length direction.
- An anode external electrode 11 is formed on the first end surface 9a
- a cathode external electrode 13 is formed on the second end surface 9b.
- the resin molding 9 has, as its outer surfaces, a bottom surface 9c and a top surface 9d facing each other in the thickness direction.
- the resin molding 9 has, as its outer surface, a first side surface 9e and a second side surface 9f facing each other in the width direction.
- a surface along the length direction (L direction) and thickness direction (T direction) of an electrolytic capacitor or a resin molding is referred to as an LT surface, and the length direction (L direction) and width direction ( The plane along the W direction) is called the LW plane, and the plane along the width direction (W direction) and the thickness direction (T direction) is called the WT plane.
- the surface on which the anode external electrode is provided is referred to as the first end face
- the surface on which the cathode external electrode is provided is referred to as the second end face.
- the anode external electrode and the cathode external electrode may be provided on the same surface on the outer surface of the resin molding.
- FIG. 2 is a cross-sectional view of the electrolytic capacitor shown in FIG. 1 taken along the line AA.
- Capacitor element 20 includes an anode 3 having a dielectric layer 5 thereon and a cathode 7 facing anode 3 .
- a plurality of capacitor elements 20 are laminated to form a laminated body 30 , and the periphery of the laminated body 30 is sealed with a sealing resin 8 to form a resin molded body 9 .
- the laminated capacitor elements 20 may be joined together via a conductive adhesive (not shown).
- One capacitor element 20 may be included in the laminate 30 .
- An anode external electrode 11 is formed on the first end face 9a of the resin molding 9, and the anode external electrode 11 is electrically connected to the anode 3 exposed from the first end face 9a.
- a cathode external electrode 13 is formed on the second end face 9b of the resin molding 9, and the cathode external electrode 13 is electrically connected to the cathode 7 exposed from the second end face 9b.
- the end portion of the valve-acting metal substrate 4 constituting the capacitor element 20 on the side of the second end surface 9b is sealed with a sealing resin 8, and the valve-acting metal substrate 4 and the solid electrolyte layer 7a or the conductive layer 7b are separated from each other. not in direct contact.
- valve action metal substrate 4 on the side of the second end surface 9b when the end portion of the valve action metal substrate 4 on the side of the second end surface 9b is covered with the dielectric layer 5 or otherwise subjected to an insulating treatment, the valve action metal substrate 4 on the second end surface 9b side may be covered with the solid electrolyte layer 7a and the conductive layer 7b.
- FIG. 3 is a cross-sectional view schematically showing the vicinity of the valve action metal substrate on the first end face of the resin molded body.
- FIG. 3 is also a cross-sectional view schematically showing a region surrounded by a dotted line in the lower left portion of FIG.
- the valve metal substrate 4 has a core portion 4a and a porous portion 4b formed along the surface of the core portion 4a. An end portion of the valve metal substrate 4 is exposed at the first end surface 9 a of the resin molded body 9 .
- a dielectric layer 5 is formed on the surface of the porous portion 4b.
- valve action metal that constitutes the valve action metal substrate
- single metals such as aluminum, tantalum, niobium, titanium, zirconium, magnesium, and silicon, and alloys containing these metals.
- aluminum or an aluminum alloy is preferred.
- the shape of the valve-acting metal substrate is not particularly limited, but it is preferably flat plate-like, more preferably foil-like.
- the porous portion is preferably an etching layer etched with hydrochloric acid or the like.
- the thickness of the valve metal substrate before etching is preferably 60 ⁇ m or more, and preferably 180 ⁇ m or less.
- the thickness of the valve-acting metal substrate (core portion) that is not etched after the etching treatment is preferably 10 ⁇ m or more, and preferably 70 ⁇ m or less.
- the thickness of the porous portion is designed according to the withstand voltage and capacitance required for the electrolytic capacitor. is preferably
- the dielectric layer is preferably made of an oxide film of the valve metal.
- an aluminum foil is used as the valve-acting metal substrate, it is anodized in an aqueous solution containing boric acid, phosphoric acid, adipic acid, or their sodium salts, ammonium salts, etc., to form a dielectric layer.
- a film can be formed.
- the dielectric layer has pores (recesses) formed along the surface of the porous portion.
- the thickness of the dielectric layer is designed according to the withstand voltage and capacitance required for the electrolytic capacitor, and is preferably 3 nm or more and preferably 200 nm or less.
- the anode external electrode 11 is provided on the first end face 9 a of the resin molded body 9 .
- the anode external electrode 11 includes a first electrode layer 11a that is in direct contact with the core portion 4a and the porous portion 4b of the valve metal substrate 4 .
- the thickness of the first electrode layer 11a in the normal direction to the outer surface of the resin molded body is the same as that formed in the core portion 4a of the valve action metal substrate 4.
- the thickness of the portion formed in the porous portion 4b of the valve action metal substrate 4 is thicker than that of the portion formed in the porous portion 4b.
- the thicknesses of the first electrode layers 11a respectively formed on the core portion 4a of the valve action metal base 4 and the porous portion 4b of the valve action metal base 4 are determined as the thickness at the thickest point at each location.
- the thicknesses of the first electrode layers 11a formed on the core portion 4a of the valve action metal base 4 and the porous portion 4b of the valve action metal base 4 are indicated by double arrows T 1 and T 2 .
- the directions indicated by double-headed arrows T 1 and T 2 are the normal directions of the first end surface 9 a that is the outer surface of the resin molded body 9 .
- the first electrode layer 11a When the first electrode layer 11a is formed on the first end surface 9a of the resin molding 9, the first electrode layer 11a is easily formed on the core portion 4a, and the porous portion 4b, which is more fragile than the core portion 4a, is formed with the first electrode layer 11a. It is difficult to form one electrode layer 11a. Therefore, the thickness of the first electrode layer 11a increases in the core portion 4a. When the thickness of the first electrode layer is thick in the core portion, the contact area with the second electrode layer formed on the first electrode layer increases compared to when the first electrode layer is flat. , the ESR can be sufficiently lowered because the adhesion to the second electrode layer is improved. Moreover, since the bonding strength between the first electrode layer and the second electrode layer is high, the terminal fixing strength can be increased when an electronic component is mounted.
- the thickness of the first electrode layer formed on the core is preferably 0.3 ⁇ m or more and 30 ⁇ m or less.
- the ESR can be further reduced, and the terminal fixing strength when an electronic component is mounted can be further increased.
- the thickness of the first electrode layer formed on the porous portion is not particularly limited as long as it is smaller than the thickness of the first electrode layer formed on the core portion.
- the cross-sectional shape of the first electrode layer is preferably wedge-shaped.
- FIG. 3 shows a wedge-shaped cross section of the first electrode layer 11a.
- the term “wedge-shaped” means a shape having a bottom in contact with the valve action metal substrate, and a width perpendicular to the direction away from the bottom (height direction) gradually narrowing in the above-described cross-sectional shape. do.
- the shape of the wedge-shaped apex is not particularly limited, and may be pointed, rounded, or flat. Also, the wedge-shaped apex may appear smooth in general, but may have irregularities when viewed microscopically.
- the first electrode layer 11a may be in contact with the sealing resin 8 as shown in FIG.
- the first electrode layer 11a is preferably an electrode layer containing at least one selected from the group consisting of Cu, Ni, Sn, Ag, Zn and Au.
- the electrode layer preferably contains at least one of Cu and Ni.
- the first electrode layer 11a is preferably an electrode layer formed on the first end surface 9a, which is the outer surface of the resin molding 9, by an aerosol deposition method. A method of forming the first electrode layer by an aerosol deposition method will be described later.
- the anode external electrode 11 preferably further includes a second electrode layer 11b formed on the first electrode layer 11a.
- the second electrode layer 11b is preferably a conductive resin electrode layer containing a conductive component and a resin component.
- the conductive component preferably contains Ag, Cu, Ni, Sn, etc. as main components, and the resin component preferably contains epoxy resin, phenol resin, etc. as main components.
- the second electrode layer is a conductive resin electrode layer containing Ag.
- the ESR can be reduced because Ag has a low specific resistance.
- the second electrode layer is preferably a printed resin electrode layer formed by screen printing an electrode paste.
- the external electrodes can be flattened compared to the case where the electrode paste is formed by dipping. That is, the film thickness uniformity of the external electrodes is improved.
- the electrode paste may contain an organic solvent, and it is preferable to use a glycol ether solvent as the organic solvent.
- a glycol ether solvent examples include diethylene glycol monobutyl ether and diethylene glycol monophenyl ether.
- the content of the additive is preferably less than 5% by weight with respect to the weight of the electrode paste.
- FIG. 2 shows the third electrode layer 11c, which is an outer plated layer provided on the surface of the second electrode layer 11b.
- the third electrode layer is preferably a Ni-plated layer or a Sn-plated layer.
- the third electrode layer consists of a first outer plating layer formed on the surface of the second electrode layer and a second outer plating layer formed on the surface of the first outer plating layer.
- the first outer plated layer is preferably a Ni plated layer
- the second outer plated layer is preferably a Sn plated layer.
- the cathode 7 constituting the capacitor element 20 includes a solid electrolyte layer 7a formed on the dielectric layer 5, a conductive layer 7b formed on the solid electrolyte layer 7a, and a cathode extraction layer formed on the conductive layer 7b. 7c.
- An electrolytic capacitor provided with a solid electrolyte layer as part of the cathode can be said to be a solid electrolytic capacitor.
- Materials constituting the solid electrolyte layer include, for example, conductive polymers having skeletons of pyrroles, thiophenes, anilines, and the like.
- Examples of the conductive polymer having a thiophene skeleton include PEDOT [poly(3,4-ethylenedioxythiophene)], and PEDOT:PSS combined with polystyrene sulfonic acid (PSS) as a dopant.
- a treatment liquid containing a monomer such as 3,4-ethylenedioxythiophene is used to form a polymer film such as poly(3,4-ethylenedioxythiophene) on the surface of the dielectric layer.
- a dispersion of a polymer such as poly(3,4-ethylenedioxythiophene) is applied to the surface of the dielectric layer and dried. It is preferable to form an outer solid electrolyte layer that covers the entire dielectric layer after forming an inner solid electrolyte layer that fills the pores (recesses).
- the solid electrolyte layer can be formed in a predetermined area by applying the above treatment liquid or dispersion onto the dielectric layer by sponge transfer, screen printing, spray coating, dispenser, inkjet printing, or the like.
- the thickness of the solid electrolyte layer is preferably 2 ⁇ m or more, and preferably 20 ⁇ m or less.
- the conductive layer is provided to electrically and mechanically connect the solid electrolyte layer and the cathode extraction layer.
- a carbon layer, graphene layer, silver layer, copper layer, nickel layer, etc. formed by applying a conductive paste such as carbon paste, graphene paste, silver paste, copper paste, nickel paste, etc. is preferred.
- the conductive layer can be formed by forming a conductive paste such as carbon paste on the solid electrolyte layer by sponge transfer, screen printing, spray coating, dispenser, inkjet printing, or the like. In addition, it is preferable to laminate the cathode extraction layer in the next step while the conductive layer is in a viscous state before drying.
- the thickness of the conductive layer is preferably 2 ⁇ m or more, and preferably 20 ⁇ m or less.
- the cathode extraction layer can be made of metal foil.
- metal foil it is preferably made of at least one metal selected from the group consisting of Al, Cu, Ag and alloys containing these metals as main components.
- the resistance value of the metal foil can be reduced, and the ESR can be reduced.
- the metal foil a metal foil whose surface is coated with carbon or titanium by a film forming method such as sputtering or vapor deposition may be used. It is more preferable to use a carbon-coated Al foil.
- the thickness of the metal foil is not particularly limited, it is preferably 20 ⁇ m or more and preferably 50 ⁇ m or less from the viewpoint of handling in the manufacturing process, miniaturization, and reduction of ESR.
- FIG. 4 is a cross-sectional view schematically showing the vicinity of the cathode extraction layer on the second end face of the resin molded body.
- FIG. 4 is also a cross-sectional view schematically showing a region surrounded by a dotted line in the lower right portion of FIG.
- the cathode lead layer 7c which is a metal foil, is exposed on the second end face 9b of the resin molded body 9. As shown in FIG.
- the cathode external electrode 13 is provided on the second end face 9 b that is the outer surface of the resin molded body 9 .
- the cathode external electrode 13 may include a first electrode layer 13a in direct contact with the cathode extraction layer 7c.
- As the first electrode layer 13a one having the same structure as the first electrode layer 11a formed on the first end face 9a of the resin molding 9 can be used.
- the cross-sectional shape of the first electrode layer is preferably wedge-shaped.
- FIG. 4 shows a wedge-shaped cross section of the first electrode layer 13a.
- the cathode external electrode 13 may include a second electrode layer 13b formed on the first electrode layer 13a, and may include a third electrode layer 13c.
- the second electrode layer 13b and the third electrode layer 13c may have the same structure as the second electrode layer 11b and the third electrode layer 11c in the anode external electrode 11, respectively.
- the sealing resin 8 forming the resin molded body 9 contains at least resin, preferably resin and filler.
- the resin it is preferable to use insulating resin such as epoxy resin, phenol resin, polyimide resin, silicone resin, polyamide resin, and liquid crystal polymer.
- the resin molded body 9 may be composed of two or more kinds of insulating resins.
- both solid resin and liquid resin can be used. Inorganic particles such as silica particles, alumina particles, and metal particles are preferably used as the filler. It is more preferable to use materials containing silica particles in solid epoxy resins and phenolic resins.
- a molding method of the resin molding when using a solid sealing material, it is preferable to use a resin mold such as a compression mold or a transfer mold, and it is more preferable to use a compression mold. Moreover, when a liquid sealing material is used, it is preferable to use a molding method such as a dispensing method or a printing method. It is preferable to seal the laminate 30 of the capacitor element 20 composed of the anode 3, the dielectric layer 5, and the cathode 7 with the sealing resin 8 by compression molding to form the resin molding 9.
- a resin mold such as a compression mold or a transfer mold
- a molding method such as a dispensing method or a printing method.
- FIG. 5 is a cross-sectional view schematically showing another example of the electrolytic capacitor of the present invention.
- the cathode lead-out layer 7c and the cathode lead-out portion 7d are formed of electrode paste instead of metal foil.
- the cathode extraction layer can be formed in a predetermined area by applying the electrode paste onto the conductive layer by sponge transfer, screen printing, spray coating, dispenser, inkjet printing, or the like.
- the electrode paste an electrode paste containing Ag, Cu, or Ni as a main component is preferable.
- the cathode extraction layer is formed from an electrode paste, the thickness of the cathode extraction layer can be made thinner than when a metal foil is used. is.
- the second electrode layer 13b can be formed by screen printing the electrode paste without providing the first electrode layer on the cathode side.
- the cathode lead-out layer 7c of each capacitor element 20 is put together as a cathode lead-out portion 7d in the vicinity of the second end face 9b and exposed at the second end face 9b.
- the cathode lead-out portion 7d can also be formed from the same electrode paste as the cathode lead-out layer 7c.
- the composition of the electrode pastes forming the cathode lead-out portion 7d and the cathode lead-out layer 7c may be different.
- an insulating mask may be provided on the anode side. In that case, the insulating mask may be provided on the surface of the dielectric layer.
- a solid electrolyte layer is formed in a predetermined region by applying the treatment liquid or the dispersion liquid on the dielectric layer by dipping. You may do so.
- the conductive layer may be formed by applying a conductive paste such as carbon paste onto the solid electrolyte layer by dipping.
- the electrolytic capacitor of the present invention When manufacturing the electrolytic capacitor of the present invention, it is preferable to form the first electrode layer on the outer surface of the resin molding by an aerosol deposition method, a gas deposition method, or the like. In particular, it is preferable to form the first electrode layer on the outer surface of the resin molding by an aerosol deposition method.
- a method for manufacturing an electrolytic capacitor which includes a step of forming a first electrode layer on the first end face, which is the outer surface of the resin molding, by an aerosol deposition method will be described below. Moreover, the process of forming a 1st electrode layer is called a 1st electrode layer formation process.
- FIG. 6 is a cross-sectional view schematically showing an example of a resin molding.
- the first electrode layer is formed by injecting fine metal particles onto the first end surface of the resin molded body under a pressure less than atmospheric pressure to cause them to collide.
- the external electrodes can be formed without using a plating process that tends to cause corrosion of the internal electrodes, so LC defects due to the plating solution can be suppressed.
- FIG. 7 is a schematic diagram showing a step of forming the first electrode layer by an aerosol deposition method.
- FIG. 7 shows an aerosol deposition device 51 .
- the aerosol deposition apparatus 51 includes a cylinder containing a carrier gas 52, an aerosol generator 54 into which the carrier gas 52 and the metal fine particles 53 are introduced to generate an aerosol, a chamber 55 into which the aerosol is introduced, and a resin molding 9. has a stage 57 which is fixed and arranged with the first end surface 9a facing up.
- fine metal particles 53 are jetted from a nozzle 56 provided at the tip of an aerosol generator 54, and collide with the first end surface 9a of the resin molding 9 to form the first electrode layer.
- the thickness of the first electrode layer can be reduced and the bonding strength between the resin molding and the first electrode layer can be increased. Furthermore, according to the aerosol deposition method, the film can be formed at a low film-forming speed and at a low temperature, so that damage to the resin molding can be reduced.
- the first electrode layer forming step is performed in a state of less than atmospheric pressure.
- the pressure inside the chamber can be reduced to less than atmospheric pressure. It is preferable to set the pressure in the chamber to 10 Pa or more and 1000 Pa or less.
- the pressure inside the chamber can be adjusted by increasing or decreasing the gas flow rate. When the gas flow rate is increased so that the pressure in the chamber becomes, for example, 100 Pa or more, the film formation speed can be increased, and as a result, the film formation cost can be reduced.
- the first electrode layer forming step is preferably performed at 100° C. or less, more preferably at room temperature. Since it is not necessary to raise the temperature, the damage to the resin molding can be reduced, and the apparatus can be simplified by carrying out at room temperature. Normal temperature may be the temperature of the working environment, and may be, for example, 10° C. or higher and 30° C. or lower.
- the fine metal particles are preferably fine particles containing at least one selected from the group consisting of Cu, Ni, Sn, Ag, Zn and Au, more preferably fine particles containing at least one of Cu and Ni.
- the particle size of the fine metal particles preferably has a D50 of less than 5 ⁇ m, more preferably less than 3 ⁇ m.
- the D50 of fine metal particles is the volume distribution-based median diameter measured by a laser diffraction/scattering method.
- MT3300 manufactured by Microtrack Bell Co., Ltd. for example, can be used.
- a second electrode layer forming step of forming a second electrode layer containing a conductive component and a resin component on the first electrode layer may be performed.
- the external electrodes can be made flatter than when the electrode paste is formed by dipping. That is, the film thickness uniformity of the external electrodes is improved.
- a third electrode layer forming step of forming a third electrode layer by plating on the second electrode layer may be performed.
- the first electrode layer forming step may also be performed on the second end surface of the resin molded body in the same manner as for the first end surface of the resin molded body to form the first electrode layer on the second end surface.
- the first electrode layer 13a as shown in FIG. 4 can be formed on the second end face 9b of the resin molding.
- the second electrode layer 13b and the third electrode layer 13c can be formed in the same manner as the first end face side of the resin molding.
- the cathode extraction layer is a metal foil
- providing the first electrode layer by the first electrode layer forming step is effective because the adhesion between the metal foil and the first electrode layer can be improved.
- Examples 1 to 5 A resin molding was obtained by sealing the laminate having the structure shown in FIGS. 1 and 2 with a sealing resin containing epoxy resin and silica particles.
- a first electrode layer was formed on the first end surface of the resin molding by an aerosol deposition method (AD method). Cu particles or Ni particles were used as the fine metal particles, and the thickness of the first electrode layer was changed by changing the film formation conditions in the aerosol deposition method.
- Table 1 shows the types of metal fine particles (metal types) and the thickness of the first electrode layer in each example.
- a first electrode layer was also formed on the second end surface of the resin molding in the same manner as for the first end surface.
- an electrode paste containing Ag was applied to the end faces (the first end face and the second end face) of the resin molding by screen printing and thermally cured to form the second electrode layer. Furthermore, an electrolytic capacitor was fabricated by forming a Ni plating layer and a Sn plating layer as a third electrode layer on the surface of the second electrode layer.
- Example 1 A zincate treatment was performed by etching the first end surface and the second end surface of the resin molding with an acid containing nitric acid as a main component to form a Zn coating. Ni plating and Ag plating were performed to form a first electrode layer. A second electrode layer and a third electrode layer were formed in the same manner as in Example 1 to produce an electrolytic capacitor.
- the thickness of the first electrode layer of the electrolytic capacitor was measured non-destructively with a fluorescent X-ray film thickness meter (SFT9450, manufactured by Hitachi High-Tech Science Co., Ltd.). The thickness obtained by this measurement method is about half the physical thickness measured by SEM/EDS after polishing the cross section of the LT surface of the electrolytic capacitor. Therefore, Table 1 shows the thickness of the first electrode layer as twice the thickness obtained by the fluorescent X-ray film thickness gauge. Also, ESR (m ⁇ ) at 100 kHz was measured with an LCR meter (E4980A manufactured by KEYSIGHT). The ESR was measured by averaging the results of measuring 10 electrolytic capacitors.
- FIG. 8 is a cross-sectional observation photograph of the vicinity of the anode-side end face of the electrolytic capacitor of Example 3. It can be seen that a wedge-shaped electrode layer is formed as the first electrode layer. It is also found that the thickness of the portion of the first electrode layer formed in the core portion of the valve-acting metal substrate is greater than the thickness of the portion formed in the porous portion of the valve-acting metal substrate.
- the ESR is lowered and the change in capacitance after the deflection test is also reduced.
- Example 4 even when the first electrode layer was formed of Ni, the same effect as in the case of Cu was observed.
- Comparative Example 1 the first electrode layer was formed by plating, the ESR was high, and the change in capacitance after the deflection test was large.
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Abstract
Description
特許文献1では、チップ基板の内部に設けた内部電極が露出した露出部に、めっき処理によって露出面に沿って伸延させた金属膜を形成し、その後、露出面に導電性樹脂ペーストを塗布して側面電極を形成している。
特許文献2では、陽極体の一部が封止体の外部に露出しており、その露出部がめっき層で被覆され、めっき層を介して陽極用導電性弾性体と電気的に接続されていることが開示されている。
しかしながら、本発明は、以下の構成に限定されるものではなく、本発明の要旨を変更しない範囲において適宜変更して適用することができる。なお、以下において記載する本発明の各実施形態の望ましい構成を2つ以上組み合わせたものもまた本発明である。
図1には電解コンデンサ1を構成する樹脂成形体9を示している。
本発明の電解コンデンサを構成する樹脂成形体の形状は特に限定されるものではなく、任意の立体形状を採用することができる。樹脂成形体の形状は直方体状であることが好ましい。また、直方体状とは完全な直方体であることを意味する語ではなく、樹脂成形体を形成する面が他の面と直交せずにテーパーを有していてもよく、また、角が面取りされている形状であってもよい。
樹脂成形体9はその外表面として、長さ方向に対向する第1端面9a及び第2端面9bを備えている。第1端面9aには陽極外部電極11が形成され、第2端面9bには陰極外部電極13が形成されている。
樹脂成形体9はその外表面として、厚さ方向に対向する底面9c及び上面9dを備えている。
また、樹脂成形体9はその外表面として、幅方向に対向する第1側面9e及び第2側面9fを備えている。
また、以下の説明においては、樹脂成形体の外表面のうち陽極外部電極が設けられる面を第1端面、陰極外部電極が設けられる面を第2端面として説明する。なお、樹脂成形体の外表面において陽極外部電極と陰極外部電極が同一の面に設けられていてもよい。
コンデンサ素子20は、表面に誘電体層5を有する陽極3と、陽極3と対向する陰極7とを含む。
コンデンサ素子20が複数積層されて積層体30となり、積層体30の周囲が封止樹脂8で封止されて樹脂成形体9となっている。積層体30において、積層されたコンデンサ素子20の間は、導電性接着剤(図示しない)を介して互いに接合されていてもよい。積層体30に含まれるコンデンサ素子20は1つでもよい。
樹脂成形体9の第1端面9aに陽極外部電極11が形成されていて、陽極外部電極11は第1端面9aから露出する陽極3と電気的に接続されている。
樹脂成形体9の第2端面9bに陰極外部電極13が形成されていて、陰極外部電極13は第2端面9bから露出する陰極7と電気的に接続されている。
コンデンサ素子20を構成する弁作用金属基体4の第2端面9b側の端部は、封止樹脂8により封止されており、弁作用金属基体4と、固体電解質層7a又は導電層7bとは直接接触していない。一方、弁作用金属基体4の第2端面9b側の端部が誘電体層5で覆われているなど、絶縁処理が施されている場合には、弁作用金属基体4の第2端面9b側の端部が、固体電解質層7a及び導電層7bで覆われていてもよい。
図3は、図2の左下部分に点線で囲った領域を模式的に示す断面図でもある。
弁作用金属基体4は、芯部4aと芯部4aの表面に沿って形成される多孔質部4bとを有している。弁作用金属基体4の端部は樹脂成形体9の第1端面9aに露出している。
多孔質部4bの表面に誘電体層5が形成されている。
エッチング前の弁作用金属基体の厚さが60μm以上であることが好ましく、180μm以下であることが好ましい。また、エッチング処理後にエッチングされていない弁作用金属基体(芯部)の厚さが10μm以上であることが好ましく、70μm以下であることが好ましい。多孔質部の厚さは電解コンデンサに要求される耐電圧、静電容量に合わせて設計されるが、弁作用金属基体の両側の多孔質部を合わせて10μm以上であることが好ましく、120μm以下であることが好ましい。
誘電体層は多孔質部の表面に沿って形成されることにより細孔(凹部)が形成されている。誘電体層の厚さは電解コンデンサに要求される耐電圧、静電容量に合わせて設計されるが、3nm以上であることが好ましく、200nm以下であることが好ましい。
陽極外部電極11は、弁作用金属基体4の芯部4a及び多孔質部4bと直接接する第1電極層11aを含む。第1電極層11aの、樹脂成形体の外表面の法線方向における厚さ(樹脂成形体の第1端面の法線方向における厚さ)は、弁作用金属基体4の芯部4aに形成された部分での厚さが弁作用金属基体4の多孔質部4bに形成された部分での厚さよりも厚い。
弁作用金属基体4の芯部4a、弁作用金属基体4の多孔質部4bにそれぞれ形成された第1電極層11aの厚さは、それぞれの箇所において最も厚いところでの厚さとして定める。図3において、弁作用金属基体4の芯部4a、弁作用金属基体4の多孔質部4bにそれぞれ形成された第1電極層11aの厚さを両矢印T1、T2で示している。
両矢印T1、T2で示す方向は、樹脂成形体9の外表面である第1端面9aの法線方向である。
芯部において第1電極層の厚さが厚くなっていると、第1電極層が平坦な場合と比較して、第1電極層の上に形成する第2電極層との密着面積が増大し、第2電極層との密着性が向上するためESRを充分に低くすることができる。また、第1電極層と第2電極層との接合強度が高いので、電子部品を実装した際の端子固着強度も高くすることができる。
第1電極層の厚さが上記範囲であると、ESRをより低くすることができ、電子部品を実装した際の端子固着強度をより高くすることができる。
第1電極層の断面形状が楔形であると、第1電極層の上に形成する第2電極層との接合強度がアンカー効果により向上するので、端子固着強度が向上する。
本明細書における楔形とは、上記の断面形状において、弁作用金属基体に接する底部を有し、底部から離れる方向(高さ方向)に沿って当該方向に直交する幅が次第に狭くなる形状を意味する。楔形の頂部の形状は特に限定されるものではなく、尖っていてもよく、丸みを帯びていてもよく、平坦であってもよい。また、楔形の頂部は、概略としては平滑に見えても微視的に見た場合に凹凸を有していてもよい。
第2電極層11bは、導電成分と樹脂成分とを含む導電性樹脂電極層であることが好ましい。
導電成分としてはAg、Cu、Ni、Snなどを主成分として含むことが好ましく、樹脂成分としては、エポキシ樹脂、フェノール樹脂などを主成分として含むことが好ましい。
特に、第2電極層がAgを含む導電性樹脂電極層であることが好ましい。Agを含む導電性樹脂電極層であるとAgの比抵抗が小さいためESRを低減させることができる。
第2電極層が印刷樹脂電極層であると、電極ペーストをディップで形成する場合と比べて、外部電極を平坦にすることができる。すなわち、外部電極の膜厚均一性が向上する。
また、必要に応じて添加剤を用いてもよい。添加剤は電極ペーストのレオロジー、特にチクソ性の調整に有用である。添加剤の含有量は、電極ペーストの重量に対して5重量%未満であることが好ましい。
第3電極層としては、Niめっき層又はSnめっき層であることが好ましい。
第3電極層が2層の場合、第3電極層は、第2電極層の表面に形成される第1外層めっき層と、第1外層めっき層の表面に形成される第2外層めっき層とを有していてもよい。
第1外層めっき層は、Niめっき層であることが好ましく、第2外層めっき層は、Snめっき層であることが好ましい。
陰極の一部として固体電解質層が設けられている電解コンデンサは、固体電解コンデンサであるといえる。
固体電解質層は、上記の処理液または分散液を、スポンジ転写、スクリーン印刷、スプレー塗布、ディスペンサ、インクジェット印刷等によって誘電体層上に塗布することにより、所定の領域に形成することができる。固体電解質層の厚さは2μm以上であることが好ましく、20μm以下であることが好ましい。
金属箔の場合は、Al、Cu、Ag及びこれらの金属を主成分とする合金からなる群より選択される少なくとも一種の金属からなることが好ましい。金属箔が上記の金属からなると、金属箔の抵抗値を低減させることができ、ESRを低減させることができる。
また、金属箔として、表面にスパッタや蒸着等の成膜方法によりカーボンコートやチタンコートがされた金属箔を用いてもよい。カーボンコートされたAl箔を用いることがより好ましい。金属箔の厚みは特に限定されないが、製造工程でのハンドリング、小型化、およびESRを低減させる観点からは、20μm以上であることが好ましく、50μm以下であることが好ましい。
図4は、図2の右下部分に点線で囲った領域を模式的に示す断面図でもある。
金属箔である陰極引き出し層7cは樹脂成形体9の第2端面9bに露出している。
陰極外部電極13は、陰極引き出し層7cと直接接する第1電極層13aを含んでいてもよい。この第1電極層13aとしては、樹脂成形体9の第1端面9aに形成する第1電極層11aと同様の構成のものを使用することができる。
樹脂成形体の外表面のうち陰極引き出し層が露出している外表面(樹脂成形体の第2端面)、及び、陰極引き出し層の主面にそれぞれ直交し、第1電極層を含む断面において、第1電極層の断面形状が楔形であることが好ましい。図4には第1電極層13aの断面形状が楔形である形状を示している。
第2電極層13bと第3電極層13cの構成も、陽極外部電極11における第2電極層11bと第3電極層11cの構成と同様の構成のものを使用することができる。
樹脂成形体の成形方法としては、固形封止材を用いる場合は、コンプレッションモールド、トランスファーモールド等の樹脂モールドを用いることが好ましく、コンプレッションモールドを用いることがより好ましい。また、液状封止材を用いる場合は、ディスペンス法や印刷法等の成形方法を用いることが好ましい。コンプレッションモールドで陽極3、誘電体層5、および陰極7からなるコンデンサ素子20の積層体30を封止樹脂8で封止して樹脂成形体9とすることが好ましい。
図5に示す電解コンデンサ2では、陰極引き出し層7c及び陰極引き出し部7dを金属箔ではなく電極ペーストにより形成している。
この場合は、電極ペーストをスポンジ転写、スクリーン印刷、スプレー塗布、ディスペンサ、インクジェット印刷等によって導電層上に塗布することにより、所定の領域に陰極引き出し層を形成することができる。電極ペーストとしては、Ag、Cu、またはNiを主成分とする電極ペーストが好ましい。陰極引き出し層を電極ペーストにより形成する場合、陰極引き出し層の厚さは金属箔を用いる場合よりも薄くすることが可能であり、スクリーン印刷の場合、2μm以上、20μm以下の厚さとすることも可能である。
陰極引き出し部7dも、陰極引き出し層7cと同様の電極ペーストにより形成することができる。また、陰極引き出し部7dと陰極引き出し層7cをそれぞれ構成する電極ペーストが異なる組成であってもよい。
陰極引き出し層7c及び陰極引き出し部7dが電極ペーストにより形成されている場合、電極ペーストのスクリーン印刷で形成した第2電極層13bとの密着性が良好となる。
なお、図5に示された本発明の電解コンデンサの別の一例では、ディッピングによって前述の処理液または分散液を誘電体層上に塗布することにより、所定の領域に固体電解質層が形成されるようにしてもよい。また、同様にディッピングによってカーボンペースト等の導電性ペーストを固体電解質層上に塗布することにより、導電層が形成されるようにしてもよい。
本発明の電解コンデンサを製造する場合、樹脂成形体の外表面にエアロゾルデポジション法、又はガスデポジション法などにより第1電極層を形成することが好ましい。特に、樹脂成形体の外表面にエアロゾルデポジション法により第1電極層を形成することが好ましい。
以下、樹脂成形体の外表面である第1端面にエアロゾルデポジション法により第1電極層を形成する工程を含む電解コンデンサの製造方法について説明する。また、第1電極層を形成する工程を第1電極層形成工程と呼ぶ。
図6は、樹脂成形体の一例を模式的に示す断面図である。
第1電極層形成工程では、樹脂成形体の第1端面に、大気圧未満の状態で、金属微粒子を噴射し、衝突させることにより第1電極層を形成する。
この工程により第1電極層を形成すると、内部電極に腐食の生じやすいめっきプロセスを用いずに外部電極を形成できるので、めっき液によるLC不良を抑制することができる。
図7にはエアロゾルデポジション装置51を示している。エアロゾルデポジション装置51は、キャリアガス52が入ったボンベと、キャリアガス52及び金属微粒子53が導入されてエアロゾルが発生するエアロゾル発生器54と、エアロゾルが導入されるチャンバー55と、樹脂成形体9が第1端面9aを上にして固定されて並べられるステージ57を有する。
エアロゾルデポジション法では、金属微粒子53はエアロゾル発生器54の先端に設けられたノズル56から噴射され、樹脂成形体9の第1端面9aに衝突することにより第1電極層となる。
エアロゾルデポジション法により第1電極層を形成すると、第1電極層の厚さを薄くすることができるとともに、樹脂成形体と第1電極層との接合強度を強くすることができる。さらに、エアロゾルデポジション法によると、成膜速度を遅く、温度を低くして成膜をすることができるので、樹脂成形体に与えるダメージを少なくすることができる。
常温とは、作業環境の温度であればよいが例えば10℃以上、30℃以下とすることができる。
金属微粒子の粒径、ノズルの走査スピード、単位時間当たりの金属微粒子の噴射量を変化させることにより、金属微粒子の付着のしやすさ及び第1電極層の厚さを調整することができる。
金属微粒子の付着のしやすさ及び第1電極層の厚さの観点から、金属微粒子の粒径は、D50が5μm未満であることが好ましく、D50が3μm未満であることがより好ましい。
金属微粒子のD50は、レーザー回折/散乱法で測定される体積分布基準のメジアン径である。
金属微粒子のD50の測定装置として、例えばマイクロトラック・ベル株式会社製MT3300を使用することができる。
第2電極層形成工程では、電極ペーストのスクリーン印刷を行って、第2電極層として印刷樹脂電極層を形成することが好ましい。
第2電極層を電極ペーストのスクリーン印刷により行うと、電極ペーストをディップで形成する場合と比べて、外部電極を平坦にすることができる。すなわち、外部電極の膜厚均一性が向上する。
当該工程により、図4に示すような第1電極層13aを樹脂成形体の第2端面9bに形成することができる。
その後、第2電極層13b、第3電極層13cを樹脂成形体の第1端面側と同様に形成することができる。
特に陰極引き出し層が金属箔である場合に、第1電極層形成工程により第1電極層を設けると金属箔と第1電極層の密着性を向上させることができるので有効である。
図1及び図2に示す構成の積層体をエポキシ樹脂とシリカ粒子を含む封止樹脂で封止して樹脂成形体を得た。
樹脂成形体の第1端面に対してエアロゾルデポジション法(AD法)により第1電極層を形成した。金属微粒子としてCu粒子又はNi粒子を使用し、エアロゾルデポジション法における膜生成条件を変更して第1電極層の厚さを変更した。
各実施例における金属微粒子の種類(金属種類)及び第1電極層の厚さを表1に示した。
樹脂成形体の第2端面に対しても第1端面と同様に第1電極層を形成した。
硝酸を主成分とする酸で樹脂成形体の第1端面及び第2端面をエッチングし、Zn被膜を形成することによりジンケート処理を行った。Niめっき及びAgめっきを行い第1電極層を形成した。
第2電極層及び第3電極層を実施例1と同様に形成して電解コンデンサを作製した。
電解コンデンサの第1電極層の厚さは、蛍光X線膜厚計(株式会社日立ハイテクサイエンス製、SFT9450)により非破壊で測定した。この測定法で得られる厚さは、電解コンデンサのLT面を断面研磨し、SEM/EDSを用いて測定した物理厚さの約半分の値となる。そのため、蛍光X線膜厚計で得られた厚さの2倍を第1電極層の厚さとみなして表1に示した。
また、LCRメーター(KEYSIGHT製 E4980A)により100kHzにおけるESR(mΩ)を測定した。ESRの測定は電解コンデンサ10個を測定した結果の平均値とした。
電解コンデンサをガラスエポキシ基板に実装し、ガラスエポキシ基板を1mm/秒で変位が10mmとなるまでたわませて、5秒間保持した後の静電容量変化率を測定した。
第1電極層と第2電極層の接合強度が弱いと剥離によりコンデンサ素子と外部電極がオープンとなり静電容量が変化するため、静電容量変化率を測定することにより、端子固着強度の評価に代えることができる。
これらの各評価試験の結果を表1に示した。
これに対して比較例1では第1電極層がめっきで形成されており、ESRは高く、たわみ試験後の静電容量変化も大きくなっていた。
3 陽極
4 弁作用金属基体
4a 芯部
4b 多孔質部
5 誘電体層
7 陰極
7a 固体電解質層
7b 導電層
7c 陰極引き出し層
7d 陰極引き出し部
8 封止樹脂
9 樹脂成形体
9a 樹脂成形体の第1端面(樹脂成形体の外表面)
9b 樹脂成形体の第2端面(樹脂成形体の外表面)
9c 樹脂成形体の底面(樹脂成形体の外表面)
9d 樹脂成形体の上面(樹脂成形体の外表面)
9e 樹脂成形体の第1側面(樹脂成形体の外表面)
9f 樹脂成形体の第2側面(樹脂成形体の外表面)
11 陽極外部電極
11a、13a 第1電極層
11b、13b 第2電極層
11c、13c 第3電極層
13 陰極外部電極
20 コンデンサ素子
30 積層体
51 エアロゾルデポジション装置
52 キャリアガス
53 金属微粒子
54 エアロゾル発生器
55 チャンバー
56 ノズル
57 ステージ
Claims (7)
- コンデンサ素子を含む積層体と前記積層体の周囲を封止する封止樹脂とを備える樹脂成形体と、
前記樹脂成形体の外表面に設けられた陽極外部電極及び陰極外部電極と、
を備える電解コンデンサであって、
前記コンデンサ素子は、
芯部とその表面に沿って形成される多孔質部とを有し、その端部が前記樹脂成形体の前記外表面に露出している弁作用金属基体と、
前記多孔質部上に形成された誘電体層と、
前記誘電体層上に形成された固体電解質層と、
前記固体電解質層上に形成された導電層と、を含み、
前記陰極外部電極は前記導電層と電気的に接続されており、
前記陽極外部電極は、前記弁作用金属基体の前記芯部及び前記多孔質部と直接接する第1電極層を含み、
前記第1電極層の前記外表面の法線方向における厚さは、前記弁作用金属基体の前記芯部に形成された部分での厚さが、前記弁作用金属基体の前記多孔質部に形成された部分での厚さよりも厚いことを特徴とする電解コンデンサ。 - 前記弁作用金属基体の前記芯部に形成された前記第1電極層の厚さが0.3μm以上、30μm以下である請求項1に記載の電解コンデンサ。
- 前記樹脂成形体の前記外表面のうち前記弁作用金属基体が露出している外表面、及び、前記弁作用金属基体の主面にそれぞれ直交し、前記第1電極層を含む断面において、前記第1電極層の断面形状が楔形である請求項1又は2に記載の電解コンデンサ。
- 前記第1電極層は、Cu、Ni、Sn、Ag、Zn及びAuからなる群から選ばれる少なくとも1種を含む電極層である請求項1~3のいずれかに記載の電解コンデンサ。
- 前記陽極外部電極は、前記第1電極層の上に形成された第2電極層をさらに含む請求項1~4のいずれかに記載の電解コンデンサ。
- 前記第2電極層は、Agを含む導電性樹脂電極層である請求項5に記載の電解コンデンサ。
- 前記樹脂成形体の前記外表面にエアロゾルデポジション法により前記第1電極層を形成することを特徴とする請求項1~6のいずれかに記載の電解コンデンサの製造方法。
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