WO2014017098A1 - 導電性高分子の製造方法および固体電解コンデンサの製造方法 - Google Patents
導電性高分子の製造方法および固体電解コンデンサの製造方法 Download PDFInfo
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- 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
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- C08G2261/30—Monomer units or repeat units incorporating structural elements in the main chain
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- C08G2261/322—Monomer units or repeat units incorporating structural elements in the main chain incorporating heteroaromatic structural elements in the main chain non-condensed
- C08G2261/3221—Monomer units or repeat units incorporating structural elements in the main chain incorporating heteroaromatic structural elements in the main chain non-condensed containing one or more nitrogen atoms as the only heteroatom, e.g. pyrrole, pyridine or triazole
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- C08G2261/322—Monomer units or repeat units incorporating structural elements in the main chain incorporating heteroaromatic structural elements in the main chain non-condensed
- C08G2261/3223—Monomer units or repeat units incorporating structural elements in the main chain incorporating heteroaromatic structural elements in the main chain non-condensed containing one or more sulfur atoms as the only heteroatom, e.g. thiophene
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- C08G2261/30—Monomer units or repeat units incorporating structural elements in the main chain
- C08G2261/32—Monomer units or repeat units incorporating structural elements in the main chain incorporating heteroaromatic structural elements in the main chain
- C08G2261/324—Monomer units or repeat units incorporating structural elements in the main chain incorporating heteroaromatic structural elements in the main chain condensed
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- C08G2261/40—Polymerisation processes
- C08G2261/44—Electrochemical polymerisation, i.e. oxidative or reductive coupling
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- 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 invention relates to a method for producing a conductive polymer. More specifically, the present invention relates to a method for producing a conductive polymer for obtaining a solid electrolytic capacitor having a low ESL (equivalent series inductance).
- a semiconductor layer made of a conductive polymer is generally used for the cathode of a solid electrolytic capacitor.
- a method for forming the semiconductor layer for example, an anode body having a dielectric layer on its surface is immersed in an electrolytic solution in which a monomer and a dopant for forming a conductive polymer are dissolved in water, and the monomer is electrolytically polymerized.
- a method involving this is known.
- a semiconductor layer made of a conductive polymer is formed on the dielectric layer.
- a compound having a thiophene skeleton is used as a monomer. Such monomers are only slightly soluble in water. Only the monomer dissolved in the electrolytic solution cannot supply an amount necessary for forming the semiconductor layer.
- Patent Document 1 Since the monomer is easily dissolved in an organic solvent, it has been proposed to use an organic solvent instead of water as a solvent for an electrolytic solution for electrolytic polymerization (Patent Document 1). However, many organic solvents are easy to evaporate, and it takes time to maintain the liquid surface position. In addition, an electrolytic solution using such a non-aqueous organic solvent has a drawback that its polymerization efficiency is low because of its high electric resistance.
- Patent Document 2 discloses that a monomer exceeding the saturation solubility is added to a mixed solvent of water and an organic solvent, and a part of the monomer is suspended in the solvent. A technique for electrolytic polymerization while stirring is disclosed.
- An object of the present invention is to provide a manufacturing method for obtaining a solid electrolytic capacitor having a low ESL (equivalent series inductance).
- a method for producing a conductive polymer comprising electropolymerizing the polymerizable material in a sol containing a polymerizable material that can be a conductive polymer.
- the sol is obtained by dissolving a polymerizable material that can be a conductive polymer in a water-soluble organic solvent to obtain a solution, and adding the solution to water while performing a homogenization treatment.
- a polymerizable material that can be a conductive polymer in a water-soluble organic solvent
- the sol further contains a dopant.
- the dielectric layer on the surface of the anode body is A method for producing a solid electrolytic capacitor, comprising forming a conductive polymer layer on the substrate.
- An anode body having a dielectric layer on its surface is immersed in a water-soluble organic solvent solution of a polymerizable material that can be a conductive polymer, pulled up, and then immersed in a sol containing the polymerizable material. Furthermore, the manufacturing method of the solid electrolytic capacitor as described in [7] or [8].
- An electropolymerization liquid for producing a conductive polymer comprising a sol containing a polymerizable material that can be a conductive polymer, water, and a water-soluble organic solvent.
- the method for producing a conductive polymer of the present invention includes electrolytic polymerization of the polymerizable material in a sol containing a polymerizable material that can be a conductive polymer.
- the sol has a liquid dispersion medium and a fine dispersoid dispersed therein.
- the dispersoid constituting the sol used in the present invention has a 50% diameter (D50) in the volume-based cumulative particle size distribution, preferably 0.5 to 1000 nm, more preferably 1 to 400 nm.
- D50 50% diameter
- the 50% diameter (D50) in the volume-based cumulative particle size distribution is measured by the dynamic light scattering method.
- the preferred sol used in the present invention is composed of a polymerizable material in which the dispersoid can be a conductive polymer, and the dispersion medium is composed of a liquid phase in which the amount of the polymerizable material that can be a conductive polymer is small. Is.
- the sol used in the present invention is not particularly limited by the preparation method.
- the sol can be obtained by dissolving a polymerizable material that can be a conductive polymer in a water-soluble organic solvent to obtain a solution, mixing the solution and water, and finely dispersing (homogenizing).
- the polymerizable material that can be the conductive polymer used in the present invention is not particularly limited.
- a compound having a thiophene skeleton and a compound having a pyrrole skeleton can be given.
- These polymerizable materials are commercially available, and can be produced by known methods.
- Compounds having a thiophene skeleton include 3-methylthiophene, 3-ethylthiophene, 3-n-propylthiophene, 3-n-butylthiophene, 3-n-pentylthiophene, 3-n-hexylthiophene, 3-n- Heptylthiophene, 3-n-octylthiophene, 3-n-nonylthiophene, 3-n-decylthiophene, 3-n-undecylthiophene, 3-n-dodecylthiophene, 3-n-octadodecylthiophene, 3-methoxy Thiophene, 3-phenylthiophene, 3-thiophenecarboxylic acid, 3-thiophene aldehyde, thiophene-3-acetic acid, 3-thiopheneethanol, 3-thiophenmalonic acid, 3-thiophenemethanol, 3-fluorothiophene,
- Examples of the compound having a pyrrole skeleton include pyrrole, 3-methylpyrrole, 3-ethylpyrrole, 3-propylpyrrole, 3-butylpyrrole, 3-pentylpyrrole, 3-hexylpyrrole, 3-heptylpyrrole, 3-octylpyrrole, 3-nonylpyrrole, 3-decylpyrrole, 3-fluoropyrrole, 3-chloropyrrole, 3-bromopyrrole, 3-cyanopyrrole, 3,4-dimethylpyrrole, 3,4-diethylpyrrole, 3,4-butylenepyrrole 3,4-methylenedioxypyrrole, 3,4-ethylenedioxypyrrole and the like.
- the amount of the polymerizable material contained in the sol is preferably 2 to 7 g / L, more preferably 4 to 6 g / L.
- the water-soluble organic solvent is an organic solvent having high compatibility with water. More specifically, the solvent is preferably 10 ml or more, more preferably 50 ml or more, and still more preferably 100 ml or more in 100 ml of water.
- water-soluble organic solvents include polyhydric alcohols such as ethylene glycol, propylene glycol, trimethylene glycol, diethylene glycol, dipropylene glycol, triethylene glycol, tripropylene glycol, tetraethylene glycol, glycerin, trimethylol ethane, and trimethylol propane.
- water-soluble organic solvents those having a boiling point of 150 ° C. or higher are preferable, and those having a boiling point of 170 ° C. or higher are more preferable.
- the upper limit of the boiling point of the water-soluble organic solvent is preferably 400 ° C, more preferably 350 ° C, and further preferably 300 ° C.
- polyhydric alcohols are preferred because of their good mixing with water, and among these polyhydric alcohols, ethylene glycol and propylene glycol are particularly preferred.
- the method for dissolving a polymerizable material that can be a conductive polymer in a water-soluble organic solvent there is no particular limitation on the method for dissolving a polymerizable material that can be a conductive polymer in a water-soluble organic solvent.
- the solution can be obtained by adding the material to a water-soluble organic solvent and stirring at room temperature.
- the amount of the polymerizable material is preferably 1 to 2 parts by mass, more preferably 1.2 to 1.8 parts by mass with respect to 100 parts by mass of the water-soluble organic solvent.
- the solution and water are mixed.
- the mixing may be performed by adding water to the solution, by adding the solution to water, or by pouring the solution and water simultaneously at a predetermined ratio.
- it may be homogenized.
- the method of the homogenized treatment is not particularly limited, and examples thereof include stirring with a homogenizer and ultrasonic irradiation.
- the most preferred approach is to add the solution to water while homogenizing.
- the mass ratio of the solution / water is preferably 2/8 to 6/4, more preferably 3/7 to 5/5.
- the sol used in the present invention preferably further contains a dopant.
- the dopant can be added to the water mixed with the solution or to the sol obtained by mixing.
- the dopant is not particularly limited as long as it increases the conductivity of the conductive polymer.
- the dopant includes halide ions such as hexafluoroline, hexafluoroarsenic, hexafluoroantimony, and tetrafluoroboron; alkyl-substituted organic sulfonate ions such as methanesulfonic acid and dodecylsulfonic acid, and cyclic sulfonate ions such as camphorsulfonic acid ion Alkyl-substituted or unsubstituted benzene mono- or disulfonate ions such as benzenesulfonic acid, paratoluenesulfonic acid, dodecylbenzenesulfonic acid,
- the dopant can be included in the sol by adding a compound capable of releasing it.
- the amount of dopant added is not particularly limited.
- the mass of the compound capable of releasing the dopant is preferably 150 to 250 parts by mass, more preferably 200 to 220 parts by mass with respect to 100 parts by mass of the polymerizable material.
- a polymerizable material that can be a conductive polymer, water, and a water-soluble organic solvent, preferably a sol containing a dopant, is useful as an electrolytic polymerization solution for producing a conductive polymer. Since the size of the dispersoid is small, it is considered that the sol hardly blocks the pore inlet of the sintered body like the monomer suspension.
- Electropolymerization is performed by immersing a conductive base material as an anode in the sol and applying a voltage to a cathode provided in the same sol.
- the voltage to be applied is not particularly limited and can be appropriately set according to the purpose. By applying this voltage, the polymerizable material is electropolymerized to synthesize the target conductive polymer.
- the method for producing a solid electrolytic capacitor according to the present invention includes a method for producing a conductive polymer in the presence of an anode body having a dielectric layer on the surface thereof, so that an upper surface of the dielectric layer on the surface of the anode body is obtained. Forming a conductive polymer layer. Specifically, an anode body having a dielectric layer on the surface is immersed in a sol containing a polymerizable material that can be a conductive polymer, and the polymerizable material is electropolymerized in the sol.
- the anode body having the dielectric layer on the surface Before the anode body having the dielectric layer on the surface is immersed in the sol, the anode body having the dielectric layer on the surface is immersed in a water-soluble organic solvent solution of a polymerizable material that can be a conductive polymer, and then pulled up. It is preferable. This operation allows the polymerizable material to be immersed in the anode body having the dielectric layer on the surface, and contributes to more uniform formation of the conductive polymer.
- the anode body having a dielectric layer on the surface may be a commercially available one, or may be obtained by electrolytically oxidizing the anode body and forming the anode body surface layer into a dielectric. .
- the anode body is manufactured from a valve metal.
- a valve metal As the anode body, a porous body obtained by sintering valve action metal powder to increase the area of the dielectric layer is preferably used.
- the valve action metal include aluminum, tantalum, niobium, and tungsten.
- An anode lead wire can be embedded in the anode body and planted to serve as a terminal of the anode body.
- the electrolytic oxidation of the anode body surface layer can be performed according to a known method. Specifically, the anode body is immersed in an electrolyte solution in which an electrolyte such as nitric acid, sulfuric acid, phosphoric acid, oxalic acid, or adipic acid and an oxygen supply agent such as hydrogen peroxide or ozone are dissolved as necessary. Electrolytic oxidation is performed by applying a voltage thereto. The voltage is applied between the anode body (anode) and the counter electrode (cathode). Energization of the anode body can be performed through the planted anode lead wire.
- an electrolyte such as nitric acid, sulfuric acid, phosphoric acid, oxalic acid, or adipic acid
- an oxygen supply agent such as hydrogen peroxide or ozone
- a cathode made of a conductive polymer is formed on the anode body formed by the above method.
- the cathode is formed by the method for producing a conductive polymer according to the present invention.
- Electropolymerization is performed by immersing an anode body as an anode in the sol and applying a voltage to a cathode provided in the same sol.
- a semiconductor layer made of a conductive polymer is formed on the dielectric layer on the anode body surface.
- a conductor layer can be provided on the semiconductor layer by a carbon paste layer or a silver paste layer, which is a conductive paste layer, or metal plating.
- the cathode lead is connected to the cathode in a state where electricity can be applied, and a part of the cathode lead is exposed outside the exterior of the electrolytic capacitor and becomes a cathode external terminal.
- the anode body is connected to the anode body through an anode lead wire so that the anode lead can be energized, and a part of the anode lead is exposed outside the exterior of the electrolytic capacitor and becomes an anode external terminal.
- a normal lead frame can be used to attach the cathode lead and the anode lead.
- the exterior can be formed by sealing with resin or the like to obtain a solid electrolytic capacitor.
- the solid electrolytic capacitor thus produced can be subjected to an aging treatment as desired.
- the solid electrolytic capacitor obtained by the production method of the present invention can be used by being mounted on various electric circuits or electronic circuits.
- Characteristics and the like were measured as follows. (capacity) The conducting wire wired to the LCR measuring device was applied to the conductor layer of the capacitor element and the lead wire planted in the capacitor element. The capacity at 120 Hz was measured with an LCR measuring instrument manufactured by Agilent.
- ESL The conducting wire wired to the LCR measuring device was applied to the conductor layer of the capacitor element and the lead wire planted in the capacitor element. ESL at 500 kHz was measured with an LCR measuring instrument manufactured by Agilent.
- Example 1 (Preparation of electrolytic polymerization solution) In 250 parts by mass of ethylene glycol, 3.7 parts by mass of 3,4-ethylenedioxythiophene was dissolved to obtain a solution. This solution was added to 525 parts by mass of water while homogenizing with a homogenizer (NS-51 manufactured by Microtech Nichion). Next, 7.5 parts by mass of an anthraquinone sulfonic acid dopant was added while homogenizing. The sol thus obtained was homogeneous and transparent. This sol was placed in a stainless steel container as an electrolytic polymerization solution.
- a homogenizer 7.5 parts by mass of an anthraquinone sulfonic acid dopant was added while homogenizing.
- the sol thus obtained was homogeneous and transparent. This sol was placed in a stainless steel container as an electrolytic polymerization solution.
- the sintered body on which the dielectric layer was formed was immersed in a 10% by mass aqueous solution of iron (III) toluenesulfonate. The sintered body was pulled up from the aqueous solution and dried at room temperature. This immersion-drying operation was further performed 4 times (total 5 times). Thereafter, the sintered body was immersed in an ethanol solution of 20% by mass of 3,4-ethylenedioxythiophene monomer. The sintered body was pulled up from the ethanol solution and dried at room temperature.
- Electrolytic polymerization was carried out by using a lead wire as an anode and a stainless steel container as a cathode, and flowing current at room temperature first at 40 ⁇ A for 15 minutes, then at 80 ⁇ A for 45 minutes, and finally at 120 ⁇ A for 10 minutes.
- the sintered body was pulled up from the electrolytic polymerization solution, washed, and dried (first time). This immersion-electrolytic polymerization-washing-drying operation was further performed once (second time).
- a carbon paste layer and a silver paste layer were sequentially laminated to produce a capacitor element.
- Two capacitor elements on the cathode part of a separately prepared lead frame with a thickness of 100 ⁇ m (made of a copper alloy plated with 0.6 ⁇ m thick nickel and 5 ⁇ m thick tin on the outermost surface) Are placed in parallel so that the 1.5 mm x 4.5 mm surface is in contact with the frame, and connected with silver paste, and the lead wire part cut to a predetermined dimension is connected to the anode part of the lead frame by welding did.
- Comparative Example 1 A mixed solvent was obtained by mixing 250 parts by mass of ethylene glycol, 525 parts by mass of water, and 7.5 parts by mass of an anthraquinone sulfonic acid dopant. To this, 3.7 parts by mass of 3,4-ethylenedioxythiophene was added, and homogenized with a homogenizer (NS-51, manufactured by Microtec Nithion). All of 3,4-ethylenedioxythiophene was not completely dissolved, and a liquid separated into two layers was obtained. A solid electrolytic capacitor was obtained in the same manner as in Example 1 except that this was an electrolytic polymerization solution. The yield of capacitors having an LC of 0.1 CV ⁇ A or less was 90% or more. The performance of the obtained capacitor is shown in Table 1.
- Example 2 250 parts by mass of ethylene glycol is 388.5 parts by mass of propylene glycol, the amount of 3,4-ethylenedioxythiophene is 4.5 parts by mass, the amount of water is 375 parts by mass, and the amount of anthraquinone sulfonate dopant is 9
- a solid electrolytic capacitor was obtained in the same manner as in Example 1 except that the amount was changed to 2 parts by mass.
- the electrolytic polymerization solution was a homogeneous and transparent sol.
- the yield of capacitors having an LC of 0.1 CV ⁇ A or less was 90% or more.
- the performance of the obtained capacitor is shown in Table 1.
- Comparative Example 2 250 parts by mass of ethylene glycol is 388.5 parts by mass of propylene glycol, the amount of 3,4-ethylenedioxythiophene is 4.5 parts by mass, the amount of water is 375 parts by mass, and the amount of anthraquinone sulfonate dopant is 9
- a solid electrolytic capacitor was obtained in the same manner as in Comparative Example 1 except that the amount was changed to 2 parts by mass.
- the electrolytic polymerization liquid was a liquid separated into two layers.
- the yield of capacitors having an LC of 0.1 CV ⁇ A or less was 90% or more.
- the performance of the obtained capacitor is shown in Table 1.
- Example 3 A solid electrolytic capacitor was prepared in the same manner as in Example 1 except that 3.7 parts by mass of 3,4-ethylenedioxythiophene was changed to 3.3 parts by mass of pyrrole and the amount of anthraquinone sulfonic acid dopant was changed to 7.0 parts by mass. Obtained.
- the electrolytic polymerization solution was a homogeneous and transparent sol.
- the yield of capacitors having an LC of 0.1 CV ⁇ A or less was 90% or more.
- the performance of the obtained capacitor is shown in Table 1.
- Comparative Example 3 A solid electrolytic capacitor was prepared in the same manner as in Comparative Example 1 except that 3.7 parts by mass of 3,4-ethylenedioxythiophene was changed to 3.3 parts by mass of pyrrole and the amount of anthraquinonesulfonic acid dopant was changed to 7.0 parts by mass. Obtained.
- the electrolytic polymerization liquid was a liquid separated into two layers. The yield of capacitors having an LC of 0.1 CV ⁇ A or less was 90% or more. The performance of the obtained capacitor is shown in Table 1.
- the amount of the polymerizable material is considered to be an amount that is in excess of the solubility in the solvent and cannot be originally dissolved.
- all the electrolytic polymerization solutions obtained in the examples are homogeneous and transparent. Therefore, it was determined that the electrolytic polymerization solution obtained in the examples was not “solution” but “sol”.
- the solid electrolytic capacitor (Example) obtained by the manufacturing method of the present invention has a significantly lower ESL (equivalent series inductance) than the solid electrolytic capacitor (Comparative Example) obtained by the conventional method.
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Description
本発明の目的は、ESL(等価直列インダクタンス)が低い固体電解コンデンサを得るための製造方法を提供することである。
[1]導電性高分子に成り得る重合性材料を含有するゾルの中において、前記重合性材料を電解重合することを含む導電性高分子の製造方法。
[2]重合性材料が、チオフェン骨格を有する化合物およびピロール骨格を有する化合物からなる群から選ばれる少なくとも一つである[1]に記載の導電性高分子の製造方法。
[3]ゾルに含まれる重合性材料の量が2~7g/Lである[1]または[2]に記載の導電性高分子の製造方法。
[4]ゾルは、導電性高分子に成り得る重合性材料を水溶性有機溶媒に溶解させて溶液を得、該溶液をホモジナイズド処理しながら水に添加することによって得られるものである、[1]~[3]のいずれかひとつに記載の導電性高分子の製造方法。
[5]ゾルを構成する分散質は、体積基準累積粒度分布における50%径が0.5~1000nmである[1]~[4]のいずれかひとつに記載の導電性高分子の製造方法。
[6]ゾルはドーパントをさらに含有する、[1]~[5]のいずれかひとつに記載の導電性高分子の製造方法。
[7]誘電体層を表面に有する陽極体の存在下に、[1]~[6]のいずれかひとつに記載の製造方法を行うことによって、陽極体の表面に在る誘電体層の上に導電性高分子層を形成することを含む固体電解コンデンサの製造方法。
[8]電解重合が、陽極体を陽極に、ゾル中に設けた対電極を陰極にして行なわれる[7]に記載の固体電解コンデンサの製造方法。
[9]誘電体層を表面に有する陽極体を導電性高分子に成り得る重合性材料の水溶性有機溶媒溶液に浸漬し、引き上げて、次いで前記重合性材料を含有するゾルに浸漬することをさらに含む[7]または[8]に記載の固体電解コンデンサの製造方法。
[10]導電性高分子に成り得る重合性材料、水、および水溶性有機溶媒を含有するゾルからなる導電性高分子製造用電解重合液。
[11]ゾルはさらにドーパントを含有する[10]に記載の導電性高分子製造用電解重合液。
溶液/水の質量比は、好ましくは2/8~6/4、より好ましくは3/7~5/5である。
(容量)
LCR測定器に配線された導線をコンデンサ素子の導電体層とコンデンサ素子に植立したリード線に当てた。120Hzにおける容量を、アジレント社製LCR測定器で測定した。
コンデンサ素子に室温下で2.5Vを印加した。電圧印加開始から30秒経過時に電源のプラス端子からコンデンサ素子のリード線、コンデンサ素子の導電体層、さらに電源のマイナス端子に亘る回路の電流値(漏れ電流)を測定した。
LCR測定器に配線された導線をコンデンサ素子の導電体層とコンデンサ素子に植立したリード線に当てた。500kHzにおけるESLを、アジレント社製LCR測定器で測定した。
〔電解重合液の調製〕
エチレングリコール250質量部に、3,4-エチレンジオキシチオフェン3.7質量部を溶解させて、溶液を得た。この溶液をホモジナイザー(マイクロテック・ニチオン社製NS-51)でホモジナイズド処理しながら水525質量部に添加した。次いで、アントラキノンスルホン酸ドーパント7.5質量部をホモジナイズド処理しながら添加した。このようにして得たゾルは均質で透明であった。このゾルを電解重合液としてステンレス製容器に入れた。
この焼結体を2質量%の燐酸水溶液に浸し、80℃、8Vで300分間電解酸化して、焼結体表面を誘電体層に化成した。なお、焼結体は全体が液中に没し且つワッシャーの上部が液に接するように浸漬した。
その後、前記焼結体を20質量%の3,4-エチレンジオキシチオフェンモノマーのエタノール溶液に浸漬した。該焼結体を該エタノール溶液から引き上げて室温にて乾燥させた。
次いで、前記電解重合液に、焼結体全体が液中に没し且つワッシャーの下部が液に接するように、焼結体を浸漬した。リード線を陽極に、ステンレス製容器を陰極にして、室温下で電流を、先ず40μAで15分間、次いで80μAで45分間、最後に120μAで10分間流して電解重合を行った。焼結体を電解重合液から引き上げて、洗浄し、乾燥させた(第1回目)。この浸漬-電解重合-洗浄-乾燥の操作をさらに1回行った(第2回目)。
電流のパターンを、80μAで30分間、次いで120μAで30分間に変えた以外は、上記と同じ手法で浸漬-電解重合-洗浄-乾燥の操作を2回行った(第3回目と第4回目)。
電流のパターンを、120μAで30分間、次いで140μAで40分間に変えた以外は、上記と同じ手法で浸漬-電解重合-洗浄-乾燥の操作を2回行った(第5回目と第6回目)。
次いで、電流のパターンを、80μAで15分間、次いで60μAで50分間、最後に40μAで30分間に変えた以外は、上記と同じ手法で浸漬-電解重合-洗浄-乾燥の操作を1回行った(第7回目)。
このようにして焼結体の表面に在る誘電体層の上に導電性高分子を形成させた。
その後、導電性高分子が誘電体層上に形成された焼結体を2質量%の燐酸水溶液に浸し、80℃、5Vで20分間電解酸化した。
別途用意した、厚さ100μmのリードフレーム(下地に厚さ0.6μmのニッケルがメッキされ、且つ最表面に厚さ5μmの錫がメッキされた銅合金製)の陰極部に、コンデンサ素子2個を1.5mm×4.5mm面をフレームに接するように並列に方向を揃えて載置し、銀ペーストで接続すると共に、所定寸法に切断したリード線部をリードフレームの陽極部に溶接で接続した。リードフレームの一部を残してコンデンサ素子を樹脂で封入し、樹脂封止体側面からはみ出たリードフレームを所定位置で切断し、樹脂封止体に沿って2回折り曲げ加工をすることにより、樹脂封止体の下面にフレーム先端を有する、大きさ7.3mm×4.3mm×1.8mm、定格2.5Vのチップ状固体電解コンデンサ320個を得た。LCが0.1CVμA以下のコンデンサの歩留まりは90%以上であった。得られたコンデンサの性能を表1に示す。なお、表1の数値は、作製した320個のコンデンサのうち、漏れ電流(LC)が0.1CVμA以下のコンデンサの平均値である。容量は120Hz、ESLは500kHzにて測定した値である。測定はアジレント社製LCRメーターを用いて行った。
エチレングリコール250質量部、水525質量部、およびアントラキノンスルホン酸ドーパント7.5質量部を混ぜ合わせて混合溶媒を得た。これに、3,4-エチレンジオキシチオフェン3.7質量部を添加して、ホモジナイザー(マイクロテック・ニチオン社製NS-51)でホモジナイズド処理した。3,4-エチレンジオキシチオフェンは全てが溶け切れず、二層分離した液が得られた。これを電解重合液とした以外は実施例1と同じ手法で固体電解コンデンサを得た。LCが0.1CVμA以下のコンデンサの歩留まりは90%以上であった。得られたコンデンサの性能を表1に示す。
エチレングリコール250質量部をプロピレングリコール388.5質量部に、3,4-エチレンジオキシチオフェンの量を4.5質量部に、水の量を375質量部に、アントラキノンスルホン酸ドーパントの量を9.2質量部に変えた以外は、実施例1と同じ手法で固体電解コンデンサを得た。電解重合液は均質で透明なゾルであった。LCが0.1CVμA以下のコンデンサの歩留まりは90%以上であった。得られたコンデンサの性能を表1に示す。
エチレングリコール250質量部をプロピレングリコール388.5質量部に、3,4-エチレンジオキシチオフェンの量を4.5質量部に、水の量を375質量部に、アントラキノンスルホン酸ドーパントの量を9.2質量部に変えた以外は、比較例1と同じ手法で固体電解コンデンサを得た。電解重合液は二層分離した液であった。LCが0.1CVμA以下のコンデンサの歩留まりは90%以上であった。得られたコンデンサの性能を表1に示す。
3,4-エチレンジオキシチオフェン3.7質量部をピロール3.3質量部に、アントラキノンスルホン酸ドーパントの量を7.0質量部に変えた以外は実施例1と同じ手法で固体電解コンデンサを得た。電解重合液は均質で透明なゾルであった。LCが0.1CVμA以下のコンデンサの歩留まりは90%以上であった。得られたコンデンサの性能を表1に示す。
3,4-エチレンジオキシチオフェン3.7質量部をピロール3.3質量部に、アントラキノンスルホン酸ドーパントの量を7.0質量部に変えた以外は比較例1と同じ手法で固体電解コンデンサを得た。電解重合液は二層分離した液であった。LCが0.1CVμA以下のコンデンサの歩留まりは90%以上であった。得られたコンデンサの性能を表1に示す。
Claims (11)
- 導電性高分子に成り得る重合性材料を含有するゾルの中において、前記重合性材料を電解重合することを含む導電性高分子の製造方法。
- 重合性材料が、チオフェン骨格を有する化合物およびピロール骨格を有する化合物からなる群から選ばれる少なくとも一つである請求項1に記載の導電性高分子の製造方法。
- ゾルに含まれる重合性材料の量が2~7g/Lである請求項1または2に記載の導電性高分子の製造方法。
- ゾルは、
導電性高分子に成り得る重合性材料を水溶性有機溶媒に溶解させて溶液を得、
該溶液をホモジナイズド処理しながら水に添加することによって得られるものである、請求項1~3のいずれかひとつに記載の導電性高分子の製造方法。 - ゾルを構成する分散質は、体積基準累積粒度分布における50%径が0.5~1000nmである、請求項1~4のいずれかひとつに記載の導電性高分子の製造方法。
- ゾルはドーパントをさらに含有する、請求項1~5のいずれかひとつに記載の導電性高分子の製造方法。
- 誘電体層を表面に有する陽極体の存在下に、請求項1~6のいずれかひとつに記載の製造方法を行うことによって、陽極体の表面に在る誘電体層の上に導電性高分子層を形成することを含む固体電解コンデンサの製造方法。
- 電解重合が、陽極体を陽極に、ゾル中に設けた対電極を陰極にして行なわれる請求項7に記載の固体電解コンデンサの製造方法。
- 誘電体層を表面に有する陽極体を導電性高分子に成り得る重合性材料の水溶性有機溶媒溶液に浸漬し、引き上げて、次いで前記重合性材料を含有するゾルに浸漬することをさらに含む請求項7または8に記載の固体電解コンデンサの製造方法。
- 導電性高分子に成り得る重合性材料、水、および水溶性有機溶媒を含有するゾルからなる導電性高分子製造用電解重合液。
- ゾルはさらにドーパントを含有する請求項10に記載の導電性高分子製造用電解重合液。
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| JP2014526774A JP5689567B2 (ja) | 2012-07-25 | 2013-07-25 | 導電性高分子の製造方法および固体電解コンデンサの製造方法 |
| US15/795,880 US10370485B2 (en) | 2012-07-25 | 2017-10-27 | Method for producing conductive polymer and method for producing solid electrolyte capacitor |
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| JPH05175081A (ja) * | 1991-12-20 | 1993-07-13 | Asahi Glass Co Ltd | 固体電解コンデンサおよびその製造方法 |
| JP2000353641A (ja) * | 1999-06-14 | 2000-12-19 | Nec Corp | 固体電子素子の製造方法 |
| WO2011108255A1 (ja) * | 2010-03-01 | 2011-09-09 | 日本ケミコン株式会社 | 固体電解コンデンサの製造方法及び固体電解コンデンサ |
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| JPS6037114A (ja) | 1983-08-09 | 1985-02-26 | 昭和電工株式会社 | 固体電解コンデンサ |
| JPH0788424B2 (ja) * | 1987-07-24 | 1995-09-27 | 株式会社小松製作所 | フィルム状導電性高分子の製造方法 |
| US6328874B1 (en) * | 1998-01-05 | 2001-12-11 | Mcdonnell Douglas Corporation | Anodically formed intrinsically conductive polymer-aluminum oxide composite as a coating on aluminum |
| JP4329299B2 (ja) * | 2001-07-16 | 2009-09-09 | パナソニック株式会社 | 固体電解コンデンサの製造方法 |
| AU2003275203A1 (en) * | 2002-09-24 | 2004-04-19 | E.I. Du Pont De Nemours And Company | Water dispersible polythiophenes made with polymeric acid colloids |
| EP1901319B1 (en) | 2005-06-30 | 2019-06-19 | Showa Denko K.K. | Method for manufacturing solid electrolytic capacitor device |
| JP5406048B2 (ja) * | 2008-02-05 | 2014-02-05 | 昭和電工株式会社 | 電子部品用素子 |
| CN102020832B (zh) * | 2010-11-25 | 2012-08-29 | 武汉大学 | 一种导电聚3,4-乙烯二氧噻吩膜及制备方法 |
| CN101979438B (zh) * | 2010-11-25 | 2012-08-08 | 武汉大学 | 一种导电聚吡咯的制备方法 |
| US9076592B2 (en) * | 2012-03-16 | 2015-07-07 | Avx Corporation | Wet capacitor cathode containing a conductive coating formed anodic electrochemical polymerization of a microemulsion |
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| JPH05175081A (ja) * | 1991-12-20 | 1993-07-13 | Asahi Glass Co Ltd | 固体電解コンデンサおよびその製造方法 |
| JP2000353641A (ja) * | 1999-06-14 | 2000-12-19 | Nec Corp | 固体電子素子の製造方法 |
| WO2011108255A1 (ja) * | 2010-03-01 | 2011-09-09 | 日本ケミコン株式会社 | 固体電解コンデンサの製造方法及び固体電解コンデンサ |
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