WO2006106703A1 - 固体電解コンデンサ素子、その製造方法、及び固体電解コンデンサ - Google Patents
固体電解コンデンサ素子、その製造方法、及び固体電解コンデンサ Download PDFInfo
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- WO2006106703A1 WO2006106703A1 PCT/JP2006/306405 JP2006306405W WO2006106703A1 WO 2006106703 A1 WO2006106703 A1 WO 2006106703A1 JP 2006306405 W JP2006306405 W JP 2006306405W WO 2006106703 A1 WO2006106703 A1 WO 2006106703A1
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- electrolytic capacitor
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-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
- H01G9/07—Dielectric layers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-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
- H01G9/0032—Processes of manufacture formation of the dielectric layer
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-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
- H01G9/042—Electrodes or formation of dielectric layers thereon characterised by the material
- H01G9/045—Electrodes or formation of dielectric layers thereon characterised by the material based on aluminium
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-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
Definitions
- Solid electrolytic capacitor element manufacturing method thereof, and solid electrolytic capacitor technical field
- the present invention relates to a method for manufacturing a solid electrolytic capacitor element with good reliability.
- Aluminum and tantalum solid electrolytic capacitors are known as capacitors having high capacity and low ESR (equivalent series resistance) used in various electronic devices.
- a solid electrolytic capacitor has an aluminum foil having fine pores on a surface layer and a sintered body of tantalum powder having minute pores inside as one electrode (conductor) on the surface layer of the electrode.
- a solid electrolytic capacitor element composed of the formed dielectric layer and the other electrode (usually a semiconductor layer) provided on the dielectric layer and the electrode layer laminated on the other electrode is sealed. Are made. In a conductor having the same volume, the surface area inside the conductor increases as the pores are smaller and the amount of pores is larger, so that the capacity of the capacitor produced with the conductor force becomes larger.
- the dielectric layer is formed by an electrochemical method called chemical conversion.
- a conductor layer is immersed in an electrolytic solution in which a mineral acid such as phosphoric acid or sulfuric acid or a salt thereof, an organic acid such as acetic acid, adipic acid, or benzoic acid or a salt thereof is dissolved, and the conductor is used as an anode.
- An example is a method in which a predetermined voltage is applied between the cathode and a cathode separately provided in the electrolytic solution. Part of the electrolyte used during the formation is taken into the dielectric layer.
- Patent Document 1 JP-A-50-100570 (Patent Document 1) (Related Application; US Pat. No. 3,864,219) exemplifies formation with an electrolytic solution using a quaternary ammonium salt.
- Patent Document 2 discloses chemical conversion using an electrolytic solution such as boric acid.
- an organic compound or an inorganic compound is used, but a conductive polymer is preferably used in consideration of the heat resistance and low ESR characteristics of the manufactured capacitor.
- This conductive polymer is a polymer with high conductivity of 10 1 2 to 10 3 S 'cm _ 1 High conductivity is exhibited by adding an electron donating compound called a dopant to a polymer having a conjugated double bond in the form of a compound (usually an insulator or a polymer having a very low conductivity).
- a method for forming a conductive polymer as a semiconductor layer an appropriate oxidant or electron is supplied in the presence of a dopant to a single molecule (monomer) that can become a conductive polymer in the pores of the conductor. And a polymerization method. When a single molecule is polymerized, a dopant is taken in, causing a strong interaction with a polymer having a conjugated double bond, resulting in a conductive polymer.
- Solid electrolytic capacitors are required to have high reliability, but one of the tests that accelerate and measure such reliability is a high-temperature load test. For example, if a solid electrolytic capacitor is left at 105 ° C and left for several thousand hours while the rated voltage of the capacitor is applied, the capacitor is accepted if the electrical performance does not deteriorate.
- Patent Document 1 Japanese Patent Application Laid-Open No. 50-100570
- Patent Document 2 Japanese Patent Laid-Open No. 50-102861
- an object of the present invention is to provide a solid electrolytic capacitor having high reliability and high capacity.
- the present inventors have formed a dielectric layer of a solid electrolytic capacitor using a semiconductor layer containing at least a conductive polymer in an electrolytic solution containing a dopant. As a result, it has been found that a highly reliable solid electrolytic capacitor can be obtained, and the present invention has been completed.
- the present invention provides the following method for producing a solid electrolytic capacitor element, a solid electrolytic capacitor produced using the method, and its use.
- a dielectric layer is formed on the surface of a conductor, and a conductive polymer is included on the dielectric layer.
- the dielectric layer is formed by chemical conversion in an electrolytic solution containing a dopant. Production method.
- the semiconductor layer has the following general formula (1) or (2)
- I ⁇ to R 4 each independently represents a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, or an alkoxy group having 1 to 6 carbon atoms
- X represents an oxygen, iow or nitrogen atom
- R 5 is present only when X is a nitrogen atom and represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms
- R 1 and R 2 and R 3 and R 4 may be bonded to each other to form a ring.
- a solid electrolytic capacitor element as described in 1 above which is at least one layer selected from a semiconductor force mainly composed of a conductive polymer obtained by doping a polymer containing a repeating unit represented by a dopant with a dopant.
- a polymer containing a repeating unit represented by the general formula (1) is represented by the following general formula (3)
- R and R 7 are each independently a hydrogen atom, a linear or branched saturated or unsaturated alkyl group having 1 to 6 carbon atoms, or an alkyl group bonded to each other at an arbitrary position.
- the semiconductor of conductivity is, 10_ 2 ⁇ : L0 3 S ' method of manufacturing a solid electrolytic capacitor element according to the 9 in the range of cm _1.
- Solid electrolytic capacitor element obtained by the manufacturing method according to any one of 1 to 13 above
- the present invention provides a method for producing a solid electrolytic capacitor element characterized by forming a dielectric layer in an electrolytic solution containing a dopant, and a capacitor element obtained by the method. According to the present invention, a solid electrolytic capacitor is provided.
- a solid electrolytic capacitor with high reliability and high capacity can be obtained.
- Examples of the conductor used in the present invention include a metal or alloy containing at least one selected from tantalum, niobium, titanium, and aluminum force as a main component, niobium oxide, or these metals, alloys, and Acid-niobium power A mixture of at least two kinds selected.
- a part of the metal may be used after being subjected to at least one treatment selected from carbonization, phosphation, boronation, nitridation, and sulfidation.
- the shape of the conductor is not particularly limited, and is foil-like, plate-like, rod-like, or! It is used as a shape that is molded or sintered after molding. A shape obtained by attaching a powdery conductor to a part of a foil-like or plate-like metal and sintering it may be used. The surface of the conductor may be processed by etching or the like to have fine pores. If the conductor is powdered to form a molded body or a molded and sintered shape, fine pores should be provided in the interior after molding or sintering by appropriately selecting the pressure during molding. Can do.
- the lead can be directly connected to the conductor.
- a lead lead prepared separately at the time of molding is used.
- a part of the wire (or lead foil) may be molded together with a conductor, and the lead-out lead wire (or lead foil) may be used as a lead lead for one electrode of the solid electrolytic capacitor element. it can.
- Insulating resin may be deposited and cured in a headband shape at the boundary between the anode part and the semiconductor layer forming part in order to prevent the semiconductor layer from being crushed.
- Preferred examples of the conductor of the present invention include an aluminum foil whose surface is subjected to etching treatment, tantalum powder, niobium powder, alloy powder containing tantalum as a main component, alloy powder containing niobium as a main component, and monoacid oxide.
- An example is a sintered body in which a large number of fine pores are present inside a powder such as niobium powder which has been formed and sintered.
- a sintered body having a large specific surface area per mass can be produced by sintering using powder having a small particle size.
- the CV value value obtained by dividing the product of the capacity and the formation voltage described below by the mass
- a solid electrolytic capacitor element produced with a sintered body having a high specific surface area and a mass of 20 mg or more, preferably 50 mg or more is preferred because it has a small volume and a large capacity.
- the dielectric layer formed on the surface of the conductor of the present invention includes Ta 2 O 3.
- List dielectric layers mainly composed of at least one selected from metal oxides such as Nb 2 o
- a dopant is a polymer compound that has a conjugated double bond in the main chain, and when it is chemically or electrochemically doped, it acts to make the polymer compound a conductive polymer.
- pyrrole or 3,4-ethylenedioxythiophene is a representative monomer, and an electron-donating compound that gives a conductive polymer having a conductivity of about lC ⁇ KS'cnT 1 when doped simultaneously with polymerization by electrolytic polymerization is used. Can be mentioned.
- the dopant include a compound having a sulfonic acid group and a boron compound in which a carboxylic acid is coordinated to a boron atom.
- examples of such compounds include benzenesulfonic acid, toluenesulfonic acid, naphthalenesulfonic acid, anthracenesulfonic acid and other aromatic rings or sulfonic acids having an alkyl-substituted aromatic ring, benzoquinonesulfonic acid, naphthoquinonesulfonic acid and anthraquinonesulfonic acid and other quinones.
- oligomers or polymers such as sulfonic acid, butyl sulfonic acid, hexyl sulfonic acid and cyclohexyl sulfonic acid having alkyl groups, polyvinyl sulfonic acid, etc. (polymerization degree: 2 to 200) sulfonic acid, of these sulfonic acids
- Typical examples include salts (ammonium salts, alkali metal salts, alkaline earth metal salts, other metal salts, etc.). These compounds may have various substituents, and a plurality of sulfonic acid groups may exist. Examples include 2,6-naphthalenedisulfonic acid, 1,2-ethanedisulfonic acid, and the like.
- Examples of the boron compound include borodisalicylic acid ammonium and hydrates thereof, and boron 1,2-carboxybenzene ammonium.
- the dopant may be a combination of a plurality of dopants.
- a solid electrolytic capacitor in which a dielectric layer is formed using a non-surfactant-based dopant, quinone sulfonic acid, or a salt of quinone sulfonic acid is preferable because of its higher reliability.
- examples of unsubstituted quinone sulfonic acid are given, but in the present invention, quinone sulfonic acid substituted with a lower alkyl group is also included.
- the dopant is the same as the dopant contained in the conductive polymer in the semiconductor layer, that is, the same dopant used for doping at the same time as the polymerization by electrolytic polymerization, the produced solid This is desirable because the ESR value of electrolytic capacitors is lower.
- the dopant used in the present invention is described as a compound, when it actually acts as a dopant, it is partially charged ( ⁇ one) or ionized (mainly ion). Therefore, the dopant as a constituent element of the present invention is in these states. (For example, in the case of benzenesulfonic acid, benzenesulfonic acid is included).
- the concentration of the dopant to be used is determined with reference to the reliability of the solid electrolytic capacitor to be produced, but it is usually used at several tens of percent or less.
- the electrolytic solution containing the dopant of the present invention is a force in which at least one dopant described above is dissolved in water and an organic solvent such as Z, various alcohols, various esters, various glymes, or the like. It is a cloudy solution.
- electrolyte solution when electrolyte solution is aqueous solution, it may be called chemical conversion aqueous solution.
- electrolytes that have been conventionally known as electrolytes for chemical conversion, for example, mineral acids such as phosphoric acid, sulfuric acid, boric acid or their salts, organic acids such as acetic acid, adipic acid, benzoic acid, nitrobenzoic acid or their salts May be dissolved or partially suspended.
- the dielectric layer of the present invention may be formed in an electrolytic solution containing a conventionally known electrolyte before and after the formation with the electrolytic solution containing the dopant of the present invention. After each chemical conversion, it is possible to put a washing and drying process to remove the used electrolyte.
- the dielectric layer is obtained by immersing the conductor in an electrolyte and applying a voltage between the conductor side as an anode and a cathode plate separately arranged in the electrolyte ("chemical conversion"). Formed by.
- the formation temperature, formation time, formation current density, etc. are determined in consideration of the type, mass and size of the conductor, the capacity and operating voltage of the target solid electrolytic capacitor element, and the like.
- the formation temperature is usually from room temperature to 100 ° C or less, and the formation time is usually from several hours to several days.
- the dielectric layer is formed in the present invention by chemical conversion in an electrolyte containing a dopant, it is considered that a trace amount of dopant is taken into the dielectric layer. Part of the dielectric layer is taken into the interior, and part of the dopant from the surface of the dielectric layer interacts with the conductive polymer of the semiconductor layer described later. It plays the role of connecting the polymer tightly, and it can be considered that it prevents the conductive polymer from detaching from the dielectric layer and degrading the dielectric loss tangent during the high temperature load test.
- examples of the other electrode formed on the dielectric layer of the present invention include at least one organic semiconductor selected from conductive polymer forces described later.
- This organic semiconductor It is essential to include a conductive polymer, and at least one compound selected from other organic semiconductors and inorganic semiconductors may be included as a layer or as a mixture.
- the organic semiconductor include an organic semiconductor composed of a benzopyrroline tetramer and chloranil, an organic semiconductor composed mainly of tetrathiotetracene, an organic semiconductor composed mainly of tetracyanoquinodimethane, Examples thereof include organic semiconductors mainly composed of a conductive polymer obtained by doping a polymer containing a repeating unit represented by the following general formula (1) or (2) with a dopant.
- I ⁇ to R 4 are each independently hydrogen atom, Al kill or alkoxy group having 1 to 6 carbon atoms having 1 to 6 carbon atoms
- X is Represents an oxygen atom
- nitrogen atom nitrogen atom
- R 5 is present only when X is a nitrogen atom and represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms
- R 1 and R 2 and R 3 and R 4 are They may be combined to form a ring.
- the polymer containing a repeating unit represented by the general formula (1) is preferably a polymer containing a structural unit represented by the following general formula (3) as a repeating unit. .
- R 6 and R 7 each independently represent a hydrogen atom, a linear or branched saturated or unsaturated alkyl group having 1 to 6 carbon atoms, or the alkyl group at any position with respect to each other. It represents a substituent that is bonded to form a cyclic structure of at least one or more 5- to 7-membered saturated hydrocarbon containing two oxygen atoms.
- the cyclic structure may be substituted, may have a V-vinylene bond, may be substituted !, or may have a fullerene structure.
- a conductive polymer containing such a chemical structure is charged and doped with a dopant.
- a dopant is not specifically limited, A well-known dopant can be used.
- the dopant include those exemplified above as those used when forming the dielectric layer formed in the electrolyte containing the dopant. These dopants are the same as described above in that a plurality of dopants may be used in combination.
- Examples of the polymer containing the repeating units represented by the formulas (1) to (3) include polyarine, polyoxyphenylene, polyphenylene sulfide, polythiophene, polyfuran, polypyrrole, polymethylbilol, And substituted derivatives and copolymers thereof. Of these, polypyrrole, polythiophene and substituted derivatives thereof (for example, poly (3,4-ethylenedioxythiophene)) are preferred.
- the semiconductor layer described above is formed by a pure chemical reaction (solution reaction, gas phase reaction, solid-liquid reaction and a combination thereof), an electropolymerization technique, or a force formed by combining these methods at least once.
- the initial ESR value of the force capacitor is compared with other methods because there is no branching of the conductive polymer chain, or the semiconductor layer thickness on the outer surface of the conductor is uniform. Therefore, it is preferable.
- the inorganic semiconductor include at least one compound selected from the group consisting of molybdenum dioxide, tungsten dioxide, lead dioxide and manganese dioxide.
- conductivity 10_ 2 ⁇ Using those L0 3 S 'range cm _1, preferably Nari small ESR value of the solid electrolytic capacitor was fabricated.
- re-formation may be performed in order to repair minute defects in the dielectric layer that occur when the semiconductor layer is formed.
- the semiconductor layer formation and re-formation may be repeated a plurality of times, or the semiconductor layer formation conditions and re-formation conditions at the time of repetition may be changed.
- the conductor is lifted from the semiconductor layer formation solution and washed and dried, but the semiconductor layer formation, semiconductor layer formation stop, washing, and drying process are repeated multiple times.
- the power may also go into the re-generation process. The reason is not clear, but when the semiconductor layer mass increases by repeating the semiconductor layer formation 'semiconductor layer formation stop-washing' drying with the same semiconductor layer formation time rather than continuously forming the semiconductor layer There is.
- the re-chemical conversion can be performed in the same manner as the above-described method for forming a dielectric layer by chemical conversion, or can be performed in a conventional electrolytic solution, but is similar to the method for forming a dielectric layer of the present invention.
- U is preferred because the ESR value of the solid electrolytic capacitor produced in the electrolyte is low.
- the re-forming voltage is performed below the forming voltage.
- a semiconductor layer may be formed.
- the re-formation may be performed any number of times at any time during the formation of the semiconductor layer, but the re-formation is performed after the final semiconductor layer is formed. It is desirable to do it.
- an electrode layer is provided on the formed semiconductor layer.
- the electrode layer can be formed by, for example, solidification of a conductive paste, plating, metal vapor deposition, adhesion of a heat-resistant conductive resin film, or the like.
- a conductive paste As the conductive paste, silver paste, copper paste, aluminum paste, carbon paste, nickel paste and the like are preferable, but these may be used alone or in combination of two or more. When two or more kinds are used, they may be mixed or laminated as separate layers. After applying the conductive paste, leave it in the air or heat it to solidify.
- the main component of the conductive paste is conductive powder such as resin and metal, but if necessary, a solvent curing agent for dissolving the resin can also be used, but the solvent is scattered during the above-mentioned heat solidification.
- conductive powder such as resin and metal, but if necessary, a solvent curing agent for dissolving the resin can also be used, but the solvent is scattered during the above-mentioned heat solidification.
- resins such as alkyd resin, acrylic resin, epoxy resin, phenol resin, imide resin, fluorine resin, ester resin, imidoamide resin, amide resin, styrene resin, etc. Is used.
- As the conductive powder powder of silver, copper, aluminum, gold, carbon, nickel, an alloy mainly containing these metals, or a mixture of these powders is used.
- the content of the conductive powder in the conductive paste is usually 40 to 97% by mass.
- the conductive paste produced has a conductivity of more than 97% by mass. This is not preferable because the adhesion of the strike becomes poor.
- the conductive paste may be used by mixing the above-described conductive polymer or metal oxide powder forming the semiconductor layer.
- Examples of the plating include nickel plating, copper plating, silver plating, gold plating, and aluminum plating.
- Examples of the deposited metal include aluminum, nickel, copper, gold, and silver.
- a carbon paste and a silver paste are sequentially stacked on the formed semiconductor layer to form an electrode layer.
- a solid electrolytic capacitor element is produced by laminating the conductor up to the electrode layer.
- the solid electrolytic capacitor element of the present invention having the above-described configuration is, for example, coated with a resin mold, a resin case, a metallic exterior case, a resin dubbing, a laminate film, etc. It can be an electrolytic capacitor product.
- a chip-shaped solid electrolytic capacitor with a resin mold exterior is particularly preferable because it can be easily reduced in size and cost.
- the capacitor of the present invention is a lead frame having a pair of opposed tip portions prepared separately, in which part of the electrode layer of the capacitor element is separately prepared. It is placed on one tip, and a part of the conductor is placed on the other tip of the lead frame.
- an anode lead obtained by cutting the tip of the anode lead may be used in order to match the dimensions.
- the former one leading end of the lead frame
- the latter the latter (the other leading end of the lead frame) is electrically and mechanically joined to each other by welding.
- the lead frame is finally cut and becomes an external terminal of the capacitor, and the shape thereof is a foil or a flat plate, and the material is iron, copper, aluminum, or these metals as main components.
- An alloy is used. Apply at least one plating layer of solder, tin, titanium, gold, silver, nickel, palladium, copper, etc. to part or all of the lead frame. May be.
- the lead frame may be subjected to various markings before or after the cutting and bending force.
- the lead frame has a pair of opposed tip portions, and a gap is provided between the tip portions to insulate the anode portion and the electrode layer portion of each capacitor element.
- the types of resins used in the resin mold exterior include known resins used for sealing capacitors such as epoxy resins, phenol resins, alkyd resins, ester resins, and aryl ester resins. Can be adopted. (For example, the filler is contained usually 70 vol% or more, the thermal expansion coefficient a ⁇ . Below 3 X 10 _5 Z ° C) generally low stress are commercially available ⁇ in each ⁇ With, This is preferable because the generation of sealing stress on the capacitor element during sealing can be mitigated. Also, a transfer machine is preferably used for sealing the resin.
- the solid electrolytic capacitor thus produced may be subjected to an aging treatment in order to repair thermal and Z or physical deterioration of the dielectric layer when the electrode layer is formed or when it is packaged.
- the aging method is performed by applying a predetermined voltage (usually within twice the rated voltage) to the capacitor. Aging time and temperature vary depending on the capacitor type, capacity, and rated voltage, so the optimum value depends on the experiment. Normally, the time is several minutes to several days, and the temperature takes into account the thermal degradation of the voltage application jig. Performed at 300 ° C or lower.
- the aging atmosphere may be under reduced pressure, normal pressure, under pressure! Further, the aging atmosphere may be air or a gas such as argon, nitrogen, helium, etc., but preferably water vapor. Aging may be carried out in an atmosphere containing water vapor, and then in a gas such as air, argon, nitrogen, helium, etc., and the stability of the dielectric layer may advance. It is possible to return to normal pressure and room temperature after supplying water vapor, or to leave the water at a high temperature of 150 to 250 ° C. for several minutes to several hours to remove excess water and perform the aging.
- the method for supplying water vapor there are a method for supplying water vapor from a water reservoir placed in an aging furnace and a method for performing aging in a thermostatic chamber. It is done.
- the voltage application method can be designed so that an arbitrary current such as a direct current, an alternating current having an arbitrary waveform, or an alternating current superimposed on the direct current flows. It is also possible to stop the voltage application during the aging and apply the voltage again. Aging can be done while boosting the voltage from low to high.
- the solid electrolytic capacitor produced by the present invention can be preferably used for, for example, a circuit using a high-capacitance capacitor such as a central processing circuit or a power supply circuit, and these circuits include a personal computer, a server, a camera, It can be used for various digital devices such as game consoles, DVDs, AV devices and mobile phones, and electronic devices such as various power supplies. Since the solid electrolytic capacitor manufactured by the present invention has a large capacity and high reliability, it is possible to obtain an electronic circuit and an electronic device with high customer satisfaction.
- a high-capacitance capacitor such as a central processing circuit or a power supply circuit
- these circuits include a personal computer, a server, a camera, It can be used for various digital devices such as game consoles, DVDs, AV devices and mobile phones, and electronic devices such as various power supplies. Since the solid electrolytic capacitor manufactured by the present invention has a large capacity and high reliability, it is possible to obtain an electronic circuit and an electronic device with high customer satisfaction.
- Niobium primary powder (average particle size 0.32 m) ground using the hydrogen embrittlement of niobium ingots is granulated, and niobium powder with an average particle size of 120 ⁇ m (this niobium powder is a fine powder, so it is naturally oxidized and oxygenated. 85000ppm present).
- this niobium powder is a fine powder, so it is naturally oxidized and oxygenated. 85000ppm present.
- the sintered body is a tank containing a mixed solution of 30 mass% ethylene glycol and water in which a small amount of pyrrole monomer and 4% anthraquinone 2-sulfonic acid dissolved separately are prepared (the tantalum foil is formed in the tank itself). So that the lead wire of the sintered body is the anode and the external electrode is the cathode. Electropolymerization is carried out at 100 A for 60 minutes, then lifted from the tank, washed with water, washed with alcohol, dried Then, re-formation was performed in the electrolyte solution of each example at 80 ° C. and 13 V for 15 minutes.
- This electrolytic polymerization and re-formation were repeated 6 times to form a semiconductor layer of polypyrrole on the dielectric layer.
- a carbon paste mainly composed of water and graphite carbon is laminated on the semiconductor layer and dried to provide a carbon layer, and then 90% by mass of silver powder and 10% by mass of acrylic resin are the main components.
- the sintered body side is attached to both ends of a pair of lead frames (0.7 ⁇ m base nickel plating and 10 ⁇ m matte tin plating on both sides of the copper alloy), which are external terminals prepared separately.
- the lead wire and the silver paste side of the electrode layer were placed so that the former was spot welded, and the latter was electrically and mechanically connected with a silver paste mainly composed of epoxy resin and silver powder.
- a 1% phosphoric acid aqueous solution containing no dopant was used in place of the chemical electrolyte used in Example 1, and each re-formation was performed in a 0.1% acetic acid aqueous solution containing no dopant.
- a chip-shaped solid electrolytic capacitor was produced in the same manner as in Example 1.
- Examples 7-12 CV (value obtained by dividing the product of capacity and formation voltage by mass) 150,000 / z F'VZg tantalum sintered body (size 4.5 X 1.0 X 3.0mm, mass 83mg, tantalum lead wire 0.40mm ⁇ was used as a conductor. In order to prevent the solution from splashing when forming the semiconductor layer in the subsequent process, a lead fluoroethylene washer was attached to the lead wire.
- the sintered body to be the anode was immersed in an electrolyte containing the dopant described in Examples 7 to 12 in Table 1 except for a part of the lead wire, and between the cathode and the tantalum plate electrode.
- a dielectric oxide film layer made of Ta 2 O was formed by applying 10 V and forming at 30 ° C. for 7 hours. Lead of this sintered body
- the sample was immersed in an 8% aqueous solution of iron iron sulfonate and dried at 100 ° C, and then alternately re-formed at 30 ° C and 9V for 5 minutes in the aqueous solution for chemical conversion in each Example 5 Repeated o
- the lead wire of the sintered body was removed and a sufficient amount of 3,4-ethylenedioxythiophene monomer and 4% anthraquinone-2- tank mixed solution containing 30 mass 0/0 ethylene glycol and water sulfonic acid was dissolved (the bath bottom made of polypropylene emissions by tantalum foil has been affixed become external electrode) immersed in, the sintered body Lee Electrode polymerization at 120 A for 60 minutes with the lead wire as the anode and the external electrode as the cathode, pulled up from the tank, water-washed 'alcohol-washed', dried in the electrolyte solution of each example at 30 ° C At 7V for 15 minutes. This electrolytic polymerization and re-formation were repeated 8 times to form a semiconductor layer having polythiophene derivative strength on the dielectric layer.
- an electrode layer was formed on the semiconductor layer in the same manner as in Example 1, and then sealed with epoxy resin to produce a chip-shaped solid electrolytic capacitor. Subsequently, it was aged at 135 ° C and 3V for 6 hours, and then left in a furnace at 185 ° C for 15 minutes to cure the exterior resin, resulting in the final chip-shaped solid electrolytic capacitor.
- Example 7 a 1% aqueous phosphoric acid solution containing no dopant was used, and each re-formation was performed in a 0.1% aqueous acetic acid solution. Thus, a chip-shaped solid electrolytic capacitor was produced.
- Capacity Measured at a room temperature of 120 Hz using an Hewlett Packard LCR measuring instrument.
- ESR The equivalent series resistance of the capacitor was measured at 100kHz.
- Dielectric loss tangent Measured at a room temperature of 120 Hz using an Hewlett Packard LCR measuring instrument.
- High temperature load test 10 capacitors of each example were mounted on the board with solder (Mounting conditions: Temperature pattern 230 ° C or more passed through reflow oven with peak temperature 260 ° C in 30 seconds in 30 seconds) 2.5V wiring was applied to each of the capacitors on the three mounting boards and placed in a 105 ° C constant temperature bath. After 2000 hours, the capacitors were taken out to room temperature.
- the produced solid electrolytic capacitor has high capacity and good reliability. I understand that.
- quinone sulfonic acid is particularly stable over long periods of time against alkyl-substituted benzene (or naphthalene) sulfonic acid so that the comparative powers of Examples 1 and 3, 2 and 4, 7 and 9, and 8 and 10 are also reduced. Excellent in properties.
Abstract
Description
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Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2006528339A JP3974645B2 (ja) | 2005-03-30 | 2006-03-29 | 固体電解コンデンサ素子、その製造方法、及び固体電解コンデンサ |
US11/910,036 US7811338B2 (en) | 2005-03-30 | 2006-03-29 | Solid electrolytic capacitor element, method for manufacturing same, and solid electrolytic capacitor |
CN2006800108522A CN101151691B (zh) | 2005-03-30 | 2006-03-29 | 固体电解电容器元件、其制备方法、及固体电解电容器 |
EP06730353A EP1876612B1 (en) | 2005-03-30 | 2006-03-29 | Solid electrolytic capacitor element, method for manufacturing same, and solid electrolytic capacitor |
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JP (1) | JP3974645B2 (ja) |
KR (1) | KR100839901B1 (ja) |
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Cited By (4)
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JP2008186881A (ja) * | 2007-01-29 | 2008-08-14 | Japan Carlit Co Ltd:The | 固体電解コンデンサ |
WO2011121984A1 (en) * | 2010-03-31 | 2011-10-06 | Nippon Chemi-Con Corporation | Solid electrolytic capacitor |
WO2013186970A1 (ja) * | 2012-06-12 | 2013-12-19 | 昭和電工株式会社 | コンデンサ素子およびその製造方法 |
JPWO2014034076A1 (ja) * | 2012-08-29 | 2016-08-08 | パナソニックIpマネジメント株式会社 | 固体電解コンデンサ |
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JP4868601B2 (ja) * | 2007-12-05 | 2012-02-01 | Necトーキン株式会社 | 固体電解コンデンサ及びその製造方法 |
JP5333674B2 (ja) | 2010-08-02 | 2013-11-06 | パナソニック株式会社 | 固体電解コンデンサ |
KR20120037749A (ko) * | 2010-10-12 | 2012-04-20 | 삼성전기주식회사 | 고체 전해 캐패시터 제조방법 |
TW201225124A (en) * | 2010-12-10 | 2012-06-16 | Cap Tan Technology Co Ltd | Capacitor structure and manufacturing method thereof |
WO2012118162A1 (ja) * | 2011-03-01 | 2012-09-07 | 日本ケミコン株式会社 | 重合液、この重合液から得られた導電性ポリマーフィルム及び固体電解コンデンサ |
TWI591670B (zh) | 2012-07-26 | 2017-07-11 | 財團法人工業技術研究院 | 電解質混合物、及用此電解質混合物之電解電容器、及其合成共軛高分子用之氧化劑混合物 |
WO2014030333A1 (ja) * | 2012-08-23 | 2014-02-27 | パナソニック株式会社 | 有機導電体、有機導電体の製造方法、電子デバイス、及び固体電解コンデンサ |
NZ739166A (en) * | 2015-07-16 | 2019-06-28 | Georgia Tech Res Inst | Processable polymers and methods of making and using thereof |
CN109791844B (zh) * | 2016-10-17 | 2021-10-26 | 株式会社村田制作所 | 固体电解电容器 |
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- 2006-03-29 JP JP2006528339A patent/JP3974645B2/ja active Active
- 2006-03-29 KR KR1020077023056A patent/KR100839901B1/ko active IP Right Grant
- 2006-03-29 CN CN2006800108522A patent/CN101151691B/zh active Active
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Cited By (6)
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JP2008186881A (ja) * | 2007-01-29 | 2008-08-14 | Japan Carlit Co Ltd:The | 固体電解コンデンサ |
WO2011121984A1 (en) * | 2010-03-31 | 2011-10-06 | Nippon Chemi-Con Corporation | Solid electrolytic capacitor |
JP2013524480A (ja) * | 2010-03-31 | 2013-06-17 | 日本ケミコン株式会社 | 固体電解コンデンサ |
WO2013186970A1 (ja) * | 2012-06-12 | 2013-12-19 | 昭和電工株式会社 | コンデンサ素子およびその製造方法 |
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JPWO2014034076A1 (ja) * | 2012-08-29 | 2016-08-08 | パナソニックIpマネジメント株式会社 | 固体電解コンデンサ |
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JPWO2006106703A1 (ja) | 2008-09-11 |
JP3974645B2 (ja) | 2007-09-12 |
US20080250621A1 (en) | 2008-10-16 |
KR20070104949A (ko) | 2007-10-29 |
TW200705489A (en) | 2007-02-01 |
CN101151691B (zh) | 2010-11-24 |
CN101151691A (zh) | 2008-03-26 |
EP1876612A1 (en) | 2008-01-09 |
EP1876612B1 (en) | 2012-11-14 |
US7811338B2 (en) | 2010-10-12 |
KR100839901B1 (ko) | 2008-06-20 |
TWI415150B (zh) | 2013-11-11 |
EP1876612A4 (en) | 2011-12-07 |
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