WO2023074172A1 - 固体電解コンデンサ素子および固体電解コンデンサ - Google Patents

固体電解コンデンサ素子および固体電解コンデンサ Download PDF

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Publication number
WO2023074172A1
WO2023074172A1 PCT/JP2022/034551 JP2022034551W WO2023074172A1 WO 2023074172 A1 WO2023074172 A1 WO 2023074172A1 JP 2022034551 W JP2022034551 W JP 2022034551W WO 2023074172 A1 WO2023074172 A1 WO 2023074172A1
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Prior art keywords
solid electrolyte
electrolyte layer
electrolytic capacitor
layer
capacitor element
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PCT/JP2022/034551
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English (en)
French (fr)
Japanese (ja)
Inventor
孝拓 吉井
兄 廣田
博美 小澤
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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 JP2023556186A priority Critical patent/JPWO2023074172A1/ja
Priority to US18/699,305 priority patent/US20240412926A1/en
Priority to CN202280071333.6A priority patent/CN118140289A/zh
Publication of WO2023074172A1 publication Critical patent/WO2023074172A1/ja
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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
    • 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
    • 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
    • H01G11/56—Solid electrolytes, e.g. gels; Additives therein
    • 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
    • H01G9/004—Details
    • H01G9/04—Electrodes or formation of dielectric layers thereon
    • H01G9/048—Electrodes or formation of dielectric layers thereon characterised by their structure
    • 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
    • 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

Definitions

  • the present disclosure relates to solid electrolytic capacitor elements and solid electrolytic capacitors.
  • a solid electrolytic capacitor includes, for example, a solid electrolytic capacitor element, an exterior body that seals the solid electrolytic capacitor element, and external electrodes that are electrically connected to the solid electrolytic capacitor element.
  • a solid electrolytic capacitor element includes an anode body, a dielectric layer formed on the surface of the anode body, and a cathode portion covering at least a portion of the dielectric layer.
  • the cathode section has a solid electrolyte layer containing a conductive polymer covering at least a portion of the dielectric layer.
  • Patent Document 1 discloses an anode, a dielectric layer provided on the surface of the anode, a first conductive polymer layer provided on the dielectric layer, and the first conductive polymer layer. a second conductive polymer layer provided thereon; a third conductive polymer layer provided on the second conductive polymer layer; a cathode layer provided, wherein the first conductive polymer layer comprises a conductive polymer film formed by polymerizing pyrrole or a derivative thereof; The polymer layer comprises a conductive polymer film formed by polymerizing thiophene or a derivative thereof, and the third conductive polymer layer is a conductive polymer formed by polymerizing pyrrole or a derivative thereof.
  • a solid electrolytic capacitor characterized by being made of a film is proposed.
  • the solid electrolytic capacitor element is usually sealed with an exterior body or the like.
  • the resin composition provided around the solid electrolytic capacitor element is molded into a predetermined shape, or the resin composition is injected between the solid electrolytic capacitor and the exterior body and solidified.
  • Another aspect of the present disclosure relates to a solid electrolytic capacitor including at least one of the solid electrolytic capacitor elements described above and an exterior body that seals the solid electrolytic capacitor element.
  • Leakage current can be reduced in solid electrolytic capacitors.
  • FIG. 1 is a cross-sectional schematic diagram of a solid electrolytic capacitor according to an embodiment of the present disclosure
  • FIG. FIG. 4 is a cross-sectional schematic diagram of a solid electrolytic capacitor according to another embodiment of the present disclosure
  • the solid electrolytic capacitor element is sealed with an outer package.
  • the solid electrolytic capacitor element In the case of a resin-made outer package, for example, the solid electrolytic capacitor element is surrounded by a resin composition and then compression-molded, or the resin composition is cured by heating to be sealed with the resin outer package. be.
  • the solid electrolytic capacitor element is sealed by filling the space between the solid electrolytic capacitor element and the exterior body with a resin composition and solidifying it. Therefore, stress due to molding, curing, filling or solidification of the resin composition is applied to the solid electrolytic capacitor element.
  • the present inventors have found that stress during sealing is applied to the solid electrolyte layer, causing cracks and leakage current. Leakage current is considered to be caused by damage to the dielectric layer when cracks occur in the solid electrolyte layer.
  • the breaking strength of the solid electrolyte layer is within the above range, even if stress is applied to the solid electrolyte layer when sealing the solid electrolytic capacitor element with the outer package, the occurrence of cracks can be reduced. . Therefore, damage to the dielectric layer is reduced. As a result, leakage current in the solid electrolytic capacitor can be reduced. Also, an increase in leakage current due to sealing can be suppressed.
  • the present disclosure also includes a solid electrolytic capacitor including at least one solid electrolytic capacitor element according to any one of (1) to (4) above and an exterior body that seals the solid electrolytic capacitor element. subsumed.
  • a solid electrolytic capacitor including at least one solid electrolytic capacitor element according to any one of (1) to (4) above and an exterior body that seals the solid electrolytic capacitor element. subsumed.
  • the high breaking strength of the solid electrolyte layer reduces cracks caused by stress when sealing the solid electrolytic capacitor element and reduces damage to the dielectric layer, thereby reducing leakage. Current is reduced. Also, an increase in leakage current due to sealing can be suppressed.
  • the solid electrolytic capacitor may include a laminate of two or more solid electrolytic capacitor elements.
  • the anode body has a first end and a second end opposite to the first end.
  • the cathode portion is formed through a dielectric at a portion of the anode body on the second end side.
  • a portion of the anode body on the second end side where the cathode portion is formed is sometimes called a cathode forming portion.
  • a portion on the first end side where the cathode portion is not formed is sometimes called anode lead portion.
  • An anode lead terminal is connected to the anode lead-out portion.
  • the dielectric layer is formed to cover at least part of the anode body.
  • a dielectric layer is an insulating layer that functions as a dielectric.
  • the dielectric layer is formed by anodizing the valve action metal on the surface of the anode body by chemical conversion treatment or the like.
  • the surface of the dielectric layer has fine irregularities according to the shape of the surface of the porous portion.
  • the dielectric layer may be formed of a material that functions as a dielectric layer.
  • the dielectric layer includes, for example, oxides of valve metals as such materials.
  • the dielectric layer contains Ta 2 O 5 when tantalum is used as the valve metal, and the dielectric layer contains Al 2 O 3 when aluminum is used as the valve metal.
  • the dielectric layer is not limited to these specific examples.
  • the solid electrolyte layer contains a conductive polymer.
  • Conductive polymers include, for example, conjugated polymers and dopants.
  • the solid electrolyte layer may further contain additives as needed.
  • Conjugated polymers include known conjugated polymers used in solid electrolytic capacitors, such as ⁇ -conjugated polymers.
  • Conjugated polymers include, for example, polymers having polypyrrole, polythiophene, polyaniline, polyfuran, polyacetylene, polyphenylene, polyphenylenevinylene, polyacene, and polythiophenevinylene as a basic skeleton.
  • polymers having a basic skeleton of polypyrrole, polythiophene, or polyaniline are preferred.
  • the above polymer may contain at least one type of monomer unit that constitutes the basic skeleton.
  • the monomer units also include monomer units having substituents.
  • the above polymers include homopolymers and copolymers of two or more monomers.
  • polythiophenes include poly(3,4-ethylenedioxythiophene) and the like.
  • the pyrrole compound may have a substituent at, for example, at least one of the 3- and 4-positions of the pyrrole ring.
  • the thiophene compound may have a substituent at, for example, at least one of the 3- and 4-positions of the thiophene ring.
  • the 3-position substituent and the 4-position substituent may be linked to form a ring condensed to a pyrrole ring or a thiophene ring.
  • the pyrrole compound includes, for example, pyrrole optionally having a substituent at at least one of the 3- and 4-positions.
  • substituents include alkyl groups (C 1-4 alkyl groups such as methyl group and ethyl group), alkoxy groups (C 1-4 alkoxy groups such as methoxy group and ethoxy group), hydroxy groups, hydroxyalkyl groups ( hydroxy C 1-4 alkyl groups such as hydroxymethyl groups) and the like are preferred, but not limited thereto.
  • substituents include alkyl groups (C 1-4 alkyl groups such as methyl group and ethyl group), alkoxy groups (C 1-4 alkoxy groups such as methoxy group and ethoxy group), hydroxy groups, hydroxyalkyl groups ( hydroxy C 1-4 alkyl groups such as hydroxymethyl groups) and the like are preferred, but not limited thereto.
  • each substituent may be the same or different.
  • a conjugated polymer containing at least a monomer unit corresponding to pyrrole, or a conjugated polymer containing at least a monomer unit corresponding to a 3,4-ethylenedioxythiophene compound (such as 3,4-ethylenedioxythiophene (EDOT)) (such as PEDOT) may also be used.
  • the conjugated polymer containing at least a monomer unit corresponding to pyrrole may contain only a monomer unit corresponding to pyrrole, and in addition to the monomer unit, a monomer corresponding to a pyrrole compound other than pyrrole (such as pyrrole having a substituent) May contain units.
  • the weight average molecular weight (Mw) is a polystyrene-equivalent value measured by gel permeation chromatography (GPC). GPC is usually measured using a polystyrene gel column and water/methanol (volume ratio 8/2) as a mobile phase.
  • dopants include at least one selected from the group consisting of anions and polyanions.
  • the amount of the dopant contained in the solid electrolyte layer is, for example, 10 parts by mass or more and 1000 parts by mass or less, or 20 parts by mass or more and 500 parts by mass or less, or 50 parts by mass or more and 200 parts by mass with respect to 100 parts by mass of the conjugated polymer. It may be less than or equal to parts by mass.
  • the breaking strength of the solid electrolyte layer is increased, and the thickness of the solid electrolyte layer can be increased and variations in thickness can be easily reduced. Therefore, the effect of reducing leakage current is further enhanced. Moreover, it is also advantageous in terms of increasing pressure resistance.
  • the second layer preferably contains a water-soluble polymer.
  • the first layer may or may not contain a water-soluble polymer.
  • copolymerizable monomers examples include acrylic acid esters (alkyl esters, hydroxyalkyl esters, etc.), methacrylic acid esters (alkyl esters, hydroxyalkyl esters, etc.), vinyl compounds (vinyl cyanide, olefins, aromatic vinyl compounds etc.), polycarboxylic acids having a polymerizable unsaturated bond (maleic acid, fumaric acid, etc.) or acid anhydrides thereof.
  • the copolymer may contain one type or two or more types of monomer units derived from other copolymerizable monomers.
  • the Mw of the water-soluble polymer is, for example, 100 or more and 5 million or less (or 1 million or less), and may be 400 or more and 5 million or less (or 1 million or less).
  • the content of the water-soluble polymer in the solid electrolyte layer is, for example, 10% by mass or more and 70% by mass or less, may be 25% by mass or more and 70% by mass or less, or is 30% by mass or more and 70% by mass or less. There may be.
  • the breaking strength of the solid electrolyte layer can be easily increased, and the effect of reducing leakage current is enhanced.
  • the content of the water-soluble polymer in the solid electrolyte layer can be determined using a sample of the solid electrolyte layer (hereinafter referred to as sample A) taken from the cross section of the sample for measuring the breaking strength described later. can. More specifically, the solid electrolyte layer is scraped off from the cross section, a predetermined amount of sample A is sampled, and the mass is measured.
  • sample A a sample of the solid electrolyte layer
  • the solid electrolyte layer is scraped off from the cross section, a predetermined amount of sample A is sampled, and the mass is measured.
  • a water-soluble polymer is extracted from sample A with water at 20°C to 40°C. Extracts are concentrated and water-soluble macromolecules are identified by liquid chromatography-mass spectrometry (LC-MS) or gas chromatography-mass spectrometry (GC-MS). Determine the concentration of water-soluble polymer in the extract by calibration curve method. From this concentration and the mass of sample A, the content (mass
  • the breaking strength of the solid electrolyte layer is 0.55 MPa or more. Since the solid electrolyte layer has such a high breaking strength, it is possible to reduce the occurrence of cracks in the solid electrolyte layer even if stress is generated when the capacitor element is sealed with the outer package, and it is possible to keep the leakage current low. can. From the viewpoint of further increasing the effect of reducing the leakage current in the solid electrolytic capacitor, the breaking strength of the solid electrolyte layer may be 0.59 MPa or more. The breaking strength of the solid electrolyte layer is 45 MPa or less. In this case, stress is easily dispersed when the anode lead-out portions of a plurality of capacitor elements are bundled.
  • the breaking strength of the solid electrolyte layer may be 15 MPa or less, 5 MPa or less, or 2 MPa or less. When the breaking strength is within such a range, a high stress dispersion effect can be easily obtained, and leakage current can be further suppressed. These lower and upper limits can be combined arbitrarily.
  • the breaking strength of the solid electrolyte layer may be, for example, 0.55 MPa or more and 45 MPa or less (or 15 MPa or less), or may be 0.55 MPa or more and 5 MPa or less (or 2 MPa or less).
  • the solid electrolyte layer having the breaking strength as described above is formed by electrolytic polymerization. By adjusting the conditions of the electrolytic polymerization, a denser and more uniform solid electrolyte layer can be formed and high breaking strength can be secured.
  • the breaking strength is measured by the nanoindentation method in accordance with ISO 14577 using a sample in which the cross section of the solid electrolyte layer is exposed.
  • a nanoindenter for example, TI950 Triboindenter manufactured by Hygitron
  • a diamond indenter is pressed in the indenter mode of the nanoindenter to measure the strength when the solid electrolyte layer breaks. Measurements are made at 20 points, and the median value is obtained. Let this median value be the breaking strength of the solid electrolyte layer.
  • a sample for measurement is prepared by embedding a solid electrolytic capacitor in an acrylic resin, cutting it in a direction parallel to the length direction at the center of the capacitor element in the width direction, exposing the cross section, and polishing it.
  • a sample for measurement is prepared in the same manner as described above except that the capacitor element is used instead of the solid electrolytic capacitor.
  • the length direction of the capacitor element is a direction parallel to the direction from the first end to the second end of the anode body.
  • the direction from the first end to the second end of the anode body is also referred to as the lengthwise direction of the anode body.
  • the direction from the first end portion to the second end portion of the anode body is the center of the end surface of the anode body on the first end side and the center of the end surface on the second end side when the anode body is not bent. is the direction connecting
  • the length direction of the capacitor element is parallel to the length direction of the cathode portion or the solid electrolyte layer.
  • the width direction of the capacitor element is parallel to the width direction of the cathode portion or the solid electrolyte.
  • the width direction of the capacitor element is a direction perpendicular to both the length direction and the thickness direction of the capacitor element (or the stacking direction of the layers forming the capacitor element).
  • indicators of the strength or hardness of a resin molded product include, for example, tensile strength, bending strength, indentation hardness, scratch hardness, rebound hardness, and the like.
  • the leakage current in the solid electrolytic capacitor tends to increase according to the degree of cracking in the solid electrolyte layer.
  • Hardness indentation hardness, scratch hardness, etc. evaluates the trace when a given pressure is applied (in other words, it evaluates the degree of deformation within the range of plastic deformation), so it occurs beyond the range of plastic deformation. Correlation with cracks that occur is low.
  • the breaking strength of the solid electrolyte layer has a high correlation with the generation of cracks in the solid electrolyte layer.
  • the minimum thickness of the solid electrolyte layer is, for example, 1 ⁇ m or more, and may be 1.3 ⁇ m or more.
  • the minimum thickness is in this range, the rigidity of the solid electrolyte layer is improved, and damage to the dielectric layer can be further reduced. Therefore, the effect of reducing the occurrence of cracks is enhanced.
  • the minimum thickness of the solid electrolyte layer is preferably 5 ⁇ m or more, more preferably 8 ⁇ m or more or 8.9 ⁇ m or more. From the viewpoint of ensuring high capacity, the minimum thickness of the solid electrolyte layer is, for example, 20 ⁇ m or less.
  • the solid electrolyte layer may have a first portion filled in the voids of the porous portion of the anode body having the dielectric layer and a second portion protruding from the main surface of the anode body having the dielectric layer. good.
  • the minimum thickness of the solid electrolyte layer is the minimum thickness of the second portion.
  • the thickness of the solid electrolyte layer is measured using a cross-sectional image of a sample prepared in the same manner as the sample for measuring breaking strength. More specifically, in the cross-sectional image of the solid electrolyte layer of the sample, the distance from the main surface of the anode body having the dielectric layer to the surface of the solid electrolyte layer (in other words, the interface between the solid electrolyte layer and the cathode extraction layer) is measured as the thickness of the solid electrolyte layer. The thickness of the solid electrolyte layer is measured at a plurality of arbitrary locations (eg, 5 locations), and the minimum value of these measured values is taken as the minimum thickness of the solid electrolyte layer. A cross-sectional image of the sample is captured using, for example, a scanning electron microscope (SEM).
  • SEM scanning electron microscope
  • the solid electrolyte layer is formed by chemical polymerization or electrolytic polymerization, or by using a liquid composition containing a conductive polymer.
  • a liquid composition containing a conductive polymer it is difficult to control the polymerization conditions, and the thickness of the solid electrolyte layer tends to vary.
  • the liquid composition is a dispersion liquid, and the liquid composition is applied and Since it is necessary to repeat the drying process several times, the thickness of the solid electrolyte layer tends to vary.
  • a dense solid electrolyte layer is formed by adjusting the conditions of electrolytic polymerization and the like in order to increase the breaking strength. Therefore, variations in the thickness of the solid electrolyte layer are reduced, and the thickness of the solid electrolyte layer can be made relatively large even in the vicinity of the ends. Therefore, when the capacitor element is sealed with the outer package, the concentration of stress in the portion where the thickness of the solid electrolyte layer is small is suppressed, the stress is dispersed throughout the solid electrolyte layer, and the stress is easily alleviated. As a result, the durability of the solid electrolyte layer is improved, and the occurrence of cracks is further suppressed. Since damage to the dielectric layer can be further reduced, the effect of reducing leakage current is further enhanced.
  • the ratio t n /t c may be, for example, 0.5 or more (or 0.75 or more) and 1.8 or less, or 0.5 or more (or 0.75 or more) and 1.5 or less. good.
  • the electrolytic polymerization of the solid electrolyte layer is performed by applying a polymerization voltage while the anode foil having the dielectric layer is in contact with (for example, immersed in) a polymerization liquid (liquid composition) containing a conductive polymer precursor. It can be carried out. Application of the superimposing voltage is performed via a power supply.
  • the anode body is usually provided with an insulation region in a predetermined region between the first end and the second end from the viewpoint of ensuring insulation between the cathode portion and the anode lead-out portion.
  • the liquid composition contains a conductive polymer precursor.
  • the conductive polymer precursor includes at least a conjugated polymer precursor and optionally includes a dopant.
  • precursors of conjugated polymers include starting monomers for conjugated polymers, oligomers and prepolymers in which a plurality of molecular chains of starting monomers are linked.
  • One type of precursor may be used, or two or more types may be used in combination.
  • At least one selected from the group consisting of monomers and oligomers (particularly, monomers) is used as the precursor from the viewpoint of facilitating the formation of a dense solid electrolyte layer and the higher orientation of the conjugated polymer. is preferred.
  • a liquid composition usually contains a solvent.
  • Solvents include, for example, at least one selected from the group consisting of water and organic solvents.
  • At least one of the Mw of the water-soluble polymer used and the concentration of the water-soluble polymer in the liquid composition may be adjusted.
  • the viscosity of the liquid mixture is moderately increased by the water-soluble polymer, and the electropolymerization proceeds slowly to obtain a dense solid electrolyte layer. It is thought that the presence of such a structure increases the strength.
  • the type of metal is not particularly limited. It is preferable to use a valve action metal (aluminum, tantalum, niobium, etc.) or an alloy containing a valve action metal for the metal foil. If necessary, the surface of the metal foil may be roughened. The surface of the metal foil may be provided with a chemical conversion coating, or may be provided with a coating of a metal (dissimilar metal) different from the metal constituting the metal foil (dissimilar metal) or a non-metal coating. Examples of dissimilar metals and non-metals include metals such as titanium and non-metals such as carbon (such as conductive carbon).
  • one end of the cathode lead terminal is electrically connected to the cathode extraction layer.
  • One end of the anode lead terminal is electrically connected to the first portion of the anode foil.
  • the other end of the anode lead terminal and the other end of the cathode lead terminal are pulled out from the exterior body.
  • the other end of each lead terminal exposed from the outer package is used for solder connection with a board on which the solid electrolytic capacitor is to be mounted.
  • a lead wire or a lead frame may be used as each lead terminal.
  • the capacitor element may be housed in an exterior body, and a resin material (for example, a resin composition containing an uncured thermosetting resin and a filler) may be injected and solidified between the exterior body and the capacitor element.
  • a resin material for example, a resin composition containing an uncured thermosetting resin and a filler
  • the capacitor element is housed in a bottomed case so that the anode lead terminal portion on the other end side and the cathode lead terminal portion on the other end side are located on the opening side of the bottomed case, and the resin material is applied to the case.
  • a solid electrolytic capacitor may be formed by injecting the solid electrolytic capacitor into the interior, sealing the opening of the bottomed case with a sealing body, and solidifying the resin material.
  • a silver paste containing silver particles and a binder resin (epoxy resin) is applied to the surface of the carbon layer 11, and the binder resin is cured by heating at 150° C. for 30 minutes to form a metal-containing layer (metal paste layer). 12 was formed.
  • the cathode lead layer 10 composed of the carbon layer 11 and the metal paste layer 12 was formed, and the cathode portion 8 composed of the solid electrolyte layer 9 and the cathode lead layer 10 was formed.
  • a plurality of capacitor elements 22 were produced as described above.
  • leakage current For the solid electrolytic capacitor, connect a resistor of 1 k ⁇ in series, measure the leakage current (initial leakage current) ( ⁇ A) after applying a rated voltage of 25 V for 1 minute with a DC power supply, and measure 20 solid electrolytic capacitors. An average value was obtained. The initial leakage current was measured for the capacitor elements in the same manner as for the solid electrolytic capacitor, and the average value of 20 capacitor elements was obtained. These average values are shown in Table 1 below as LC for the capacitor and LC for the capacitor element, respectively.
  • the leakage current in the capacitor element was 7.6 ⁇ A or less, which is much smaller than that of R1, and the leakage current in the solid electrolytic capacitor was also very small, 28.3 ⁇ A or less.
  • the high breaking strength of the solid electrolyte layer reduces the occurrence of cracks when the capacitor element is sealed with the resin sheath, thereby reducing damage to the dielectric layer.
  • the larger the minimum value of the thickness of the solid electrolyte layer or the thickness of the second portion the smaller the leakage current in the solid electrolytic capacitor (comparison between R1 and E4 and E1 to E3).

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  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
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  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
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PCT/JP2022/034551 2021-10-26 2022-09-15 固体電解コンデンサ素子および固体電解コンデンサ Ceased WO2023074172A1 (ja)

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JP2023556186A JPWO2023074172A1 (https=) 2021-10-26 2022-09-15
US18/699,305 US20240412926A1 (en) 2021-10-26 2022-09-15 Solid-state electrolytic capacitor element and solid-state electrolytic capacitor
CN202280071333.6A CN118140289A (zh) 2021-10-26 2022-09-15 固体电解电容器元件及固体电解电容器

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2025134616A1 (ja) * 2023-12-22 2025-06-26 パナソニックＩｐマネジメント株式会社 導電性高分子化合物、導電性高分子組成物、及び、電子部品

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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