JP2012114128A5 - - Google Patents

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JP2012114128A5
JP2012114128A5 JP2010259627A JP2010259627A JP2012114128A5 JP 2012114128 A5 JP2012114128 A5 JP 2012114128A5 JP 2010259627 A JP2010259627 A JP 2010259627A JP 2010259627 A JP2010259627 A JP 2010259627A JP 2012114128 A5 JP2012114128 A5 JP 2012114128A5
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electrolyte layer
solid electrolyte
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すなわち、本発明の固体電解コンデンサは、多孔質化された弁作用金属からなる陽極導体と、前記陽極導体の表面に形成された陽極酸化皮膜と、前記陽極酸化皮膜の表面に形成された導電性高分子からなる固体電解質層と、前記固体電解質層の表面に形成されたグラファイト層と、前記グラファイト層の表面に形成された銀層からなる素子陰極部で構成される固体電解コンデンサであって、前記固体電解質層が前記陽極酸化皮膜の表面に形成された第一の固体電解質層と、前記第一の固体電解質層の表面に形成された第二の固体電解質層からなり、前記第一の固体電解質層は、少なくとも1つのスルホ基及び少なくとも1つのアミノ基、または少なくとも1つのスルホ基及び少なくとも1つのイミノ基を有する有機酸をドーパントとして含む導電性高分子により形成され、前記第二の固体電解質層は、少なくとも1つのスルホ基を有する高分子の有機酸をドーパントとして含む導電性高分子により形成されていることを特徴とする。 That is, the solid electrolytic capacitor of the present invention includes an anode conductor made of a porous valve metal, an anodized film formed on the surface of the anode conductor, and an electrically conductive film formed on the surface of the anodized film. A solid electrolytic capacitor comprising a solid electrolyte layer made of a polymer, a graphite layer formed on the surface of the solid electrolyte layer, and an element cathode portion made of a silver layer formed on the surface of the graphite layer, The solid electrolyte layer comprises a first solid electrolyte layer formed on the surface of the anodized film and a second solid electrolyte layer formed on the surface of the first solid electrolyte layer, and the first solid the electrolyte layer comprises an organic acid having at least one sul e group and at least one amino group or at least one sul e group and at least one imino group, as a dopant Is formed by conductive polymer, the second solid electrolyte layer is characterized in that the organic acid polymer having at least one sul host group is formed of a conductive polymer containing a dopant.

また、本発明の固体電解コンデンサの製造方法は、前記第一の固体電解質層は化学酸化重合または電解酸化重合にて形成し、前記第二の固体電解質層は少なくとも1つの前記スルホ基を有する高分子の有機酸をドーパントとして含む前記導電性高分子の分散液に浸漬した後、温度80℃以上260℃以下で熱処理する工程を有することを特徴とする。 The manufacturing method of solid electrolytic capacitor of the present invention, the first solid electrolyte layer is formed by chemical oxidative polymerization or electrolytic oxidation polymerization, the second solid electrolyte layer comprises at least one of the sul ho group It has the process of heat-processing at the temperature of 80 degreeC or more and 260 degrees C or less after being immersed in the dispersion liquid of the said conductive polymer containing a polymeric organic acid as a dopant.

本発明によれば、第一の固体電解質層の表面に形成された第二の固体電解質層からなり、第一の固体電解質層は、少なくとも1つのスルホ基及び少なくとも1つのアミノ基、または少なくとも1つのスルホ基及び少なくとも1つのイミノ基を有する有機酸をドーパントとして含む導電性高分子により形成され、第二の固体電解質層は、少なくとも1つのスルホ基を有する高分子の有機酸をドーパントとして含む導電性高分子により形成されていることにより、ESRやLCが低く、ショート不良数の少ない固体電解コンデンサを得ることができる。 According to the present invention, from the second solid electrolyte layer formed on the surface of the first solid electrolyte layer, the first solid electrolyte layer, at least one sul e group and at least one amino group or at least, It is formed of a conductive polymer containing an organic acid as a dopant having one sul e group and at least one imino group, the second solid electrolyte layer, a dopant an organic acid polymer having at least one sul ho group The solid electrolytic capacitor having a low ESR and LC and a small number of short-circuit defects can be obtained.

これは、第一の固体電解質層を形成する導電性高分子にドーパントとして含まれるアミノ基、またはイミノ基が導電性高分子の水溶液中でプラスに帯電し、第二の固体電解質層を形成する導電性高分子にドーパントとして含まれるスルホ基を有する高分子の有機酸が、導電性高分子の水溶液中でマイナスに帯電して分散していることを利用したものである。これら、アミノ基またはイミノ基と、スルホ基が電荷の極性の違いで互いに引き合うことにより、従来技術では形成することが難しい、直方体のタンタルペレットの稜線部や角部にも、緻密で均一な厚みをもった第二の固体電解質層を形成させることを可能にするものである。 This is because the amino group or imino group contained as a dopant in the conductive polymer forming the first solid electrolyte layer is positively charged in the aqueous solution of the conductive polymer to form the second solid electrolyte layer. organic acid polymer having a sulfonic e group contained as a dopant in the conductive polymer is obtained by utilizing the fact that charged dispersed negatively in an aqueous solution of a conductive polymer. These, an amino group or imino group, by e groups attract each other by difference in polarity of the charge, it is difficult to form in the prior art, also the ridge portion and the corner portion of the rectangular parallelepiped tantalum pellet, a dense and uniform It is possible to form a second solid electrolyte layer having a thickness.

続いて、焼結体をエタノールと水に順に浸漬することで洗浄し、乾燥した後に、ガスクロマトグラフィー質量分析(GC−MS)により測定した、分子量が約100,000のポリスチレンスルホン酸における一部のスルホ基に、ポリ3,4−エチレンジオキシチオフェンをドーピングした導電性高分子を、水溶液中で安定的に分散させた分散液に焼結体を浸漬し、一定の速度で引き上げた。その後、150℃で熱処理をすることで、第一の固体電解質層の表面に、厚さが約4μmの第二の固体電解質層を形成させ、陽極酸化皮膜の表面に第一の固体電解質層と第二の固体電解質層を合わせた約5μmの厚みを有した固体電解質層を形成した。 Subsequently, the sintered body was washed by immersing in ethanol and water in order, dried, and then partially measured in polystyrene sulfonic acid having a molecular weight of about 100,000 as measured by gas chromatography mass spectrometry (GC-MS). to the Sur ho group, a conductive polymer doped with poly 3,4-ethylenedioxythiophene, the sintered body was immersed in a dispersion stably dispersed in an aqueous solution, which raised at a constant rate. Thereafter, by performing heat treatment at 150 ° C., a second solid electrolyte layer having a thickness of about 4 μm is formed on the surface of the first solid electrolyte layer, and the first solid electrolyte layer is formed on the surface of the anodized film. A solid electrolyte layer having a thickness of about 5 μm was formed by combining the second solid electrolyte layers.

(比較例3)
実施例1と同様に、第一の固体電解質層を形成し、平均分子量が7,000のポリスチレンスルホン酸における一部のスルホ基に、ポリ3,4−エチレンジオキシチオフェンをドーピングした導電性高分子を含んだ分散液に焼結体を浸漬し、一定の速度で引き上げた。その後、温度150℃で熱処理をすることで、第二の固体電解質層を形成した。以降の工程は実施例1と同様に行い固体電解コンデンサを作製した。
(Comparative Example 3)
As in Example 1, to form a first solid electrolyte layer, a part of the sul ho group average molecular weight of the polystyrene sulfonic acid 7,000, conductive doped poly 3,4-ethylenedioxythiophene The sintered body was immersed in a dispersion containing a polymer and pulled up at a constant speed. Then, the 2nd solid electrolyte layer was formed by heat-processing at the temperature of 150 degreeC. The subsequent steps were performed in the same manner as in Example 1 to produce a solid electrolytic capacitor.

(比較例4)
実施例1と同様に、第一の固体電解質層を形成し、平均分子量が600,000のポリスチレンスルホン酸における一部のスルホ基に、ポリ3,4−エチレンジオキシチオフェンをドーピングした導電性高分子を含んだ分散液に焼結体を浸漬し、一定の速度で引き上げた。その後、温度150℃で熱処理をすることで、第二の固体電解質層とし、以降は実施例1と同様に行い固体電解コンデンサを作製した。
(Comparative Example 4)
As in Example 1, to form a first solid electrolyte layer, a part of the sul ho group average molecular weight of the polystyrene sulfonic acid 600,000, conductive doped poly 3,4-ethylenedioxythiophene The sintered body was immersed in a dispersion containing a polymer and pulled up at a constant speed. Then, it heat-processed at the temperature of 150 degreeC, it was set as the 2nd solid electrolyte layer, and it carried out similarly to Example 1 after that, and produced the solid electrolytic capacitor.

Claims (4)

多孔質化された弁作用金属からなる陽極導体と、前記陽極導体の表面に形成された陽極酸化皮膜と、前記陽極酸化皮膜の表面に形成された導電性高分子からなる固体電解質層と、前記固体電解質層の表面に形成されたグラファイト層と、前記グラファイト層の表面に形成された銀層からなる素子陰極部で構成される固体電解コンデンサであって、前記固体電解質層が前記陽極酸化皮膜の表面に形成された第一の固体電解質層と、前記第一の固体電解質層の表面に形成された第二の固体電解質層からなり、前記第一の固体電解質層は、少なくとも1つのスルホ基及び少なくとも1つのアミノ基を有する有機酸、または少なくとも1つのスルホ基及び少なくとも1つのイミノ基を有する有機酸を、ドーパントとして含む導電性高分子により形成され、前記第二の固体電解質層は、少なくとも1つのスルホ基を有する高分子の有機酸をドーパントとして含む導電性高分子により形成されていることを特徴とする固体電解コンデンサ。 An anode conductor made of a porous valve metal, an anodized film formed on the surface of the anode conductor, a solid electrolyte layer made of a conductive polymer formed on the surface of the anodized film, and A solid electrolytic capacitor comprising a graphite layer formed on the surface of a solid electrolyte layer and an element cathode portion comprising a silver layer formed on the surface of the graphite layer, wherein the solid electrolyte layer is formed of the anodized film. a first solid electrolyte layer formed on the surface, the second consists of a solid electrolyte layer formed on the surface of the first solid electrolyte layer, the first solid electrolyte layer, at least one sul ho group and organic acids having at least one amino group or an organic acid having at least one sul e group and at least one imino group, is formed of a conductive polymer containing a dopant, The second solid electrolyte layer, a solid electrolytic capacitor, characterized in that it is formed of a conductive polymer containing an organic acid polymer having at least one sul e group as a dopant. 前記第一の固体電解質層と前記第二の固体電解質層の少なくとも1組が、交互に積層されていることを特徴とする請求項1に記載の固体電解コンデンサ。   The solid electrolytic capacitor according to claim 1, wherein at least one pair of the first solid electrolyte layer and the second solid electrolyte layer is alternately laminated. 前記第二の固体電解質層を形成する前記有機酸の分子量は、10,000以上500,000以下であることを特徴とする請求項1または2に記載の固体電解コンデンサ。   3. The solid electrolytic capacitor according to claim 1, wherein the molecular weight of the organic acid forming the second solid electrolyte layer is 10,000 or more and 500,000 or less. 前記第一の固体電解質層は、化学酸化重合または電解酸化重合にて形成し、前記第二の固体電解質層は、少なくとも1つの前記スルホ基を有する高分子の有機酸をドーパントとして含む前記導電性高分子の分散液に浸漬した後、温度80℃以上260℃以下で熱処理する工程を有することを特徴とする請求項1から3のいずれか1項に記載の固体電解コンデンサの製造方法。 The first solid electrolyte layer, was formed by a chemical oxidative polymerization or electrolytic oxidation polymerization, the second solid electrolyte layer, the conductive containing organic acid polymer having at least one of the sul e group as a dopant 4. The method for producing a solid electrolytic capacitor according to claim 1, further comprising a step of heat-treating at a temperature of 80 ° C. or higher and 260 ° C. or lower after being immersed in a dispersion of the conductive polymer.
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