Solid electrolytic capacitor
A technology of solid electrolysis and capacitors, which is applied in the manufacture of solid electrolytic capacitors, electrolytic capacitors, and electrolytic capacitors. It can solve problems such as large leakage currents and achieve good capacitance and excellent leakage current characteristics.
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Embodiment approach 1
[0015] When an alloy composed of titanium (Ti) and zirconium (Zr) is used for the anode conductor and the anode conductor is anodized in an electrolytic solution, an oxide film, ie, a dielectric layer, is formed on the surface of the anode. An electrolyte layer containing a conductive polymer is formed on the oxide film.
[0016] In the present invention, it has been found that when titanium, whose oxide film is excellent in relative permittivity, is selected from valve metals, titanium is alloyed with zirconium which is the same group as titanium, and the alloy is combined with an electrolyte containing a conductive polymer , both good capacitance and excellent leakage current characteristics can be obtained under specified conditions.
[0017] Since Ti and Zr are congener elements and form a complete solid solution, a uniform alloy can be advantageously obtained in any composition, and when Zr is contained at an atomic ratio of 20% or more, the leakage current decreases afte...
Embodiment 1
[0025] An alloy plate having an atomic ratio of Ti and Zr of 80:20 manufactured by the button arc melting method was used as an anode, and an anode containing 0.05 wt % phosphoric acid, 50 wt % a An electrolyte of glycol and water was used for anodization for 2 hours. The film thickness of the oxide film thus formed was measured by a transmission electron microscope to be 200 nm.
[0026] After that, a dispersion liquid of polythiophene as a conductive polymer was coated on the oxide film, and then the coated film was dried to form an electrolyte layer. In addition, graphite paste and silver paste were applied and cured to form a cathode drawing layer to obtain a solid electrolytic capacitor.
[0027] For the obtained solid electrolytic capacitor, capacitance was measured at a frequency of 120 Hz. Leakage current was also measured after applying a direct current voltage of 50 V for 5 minutes.
Embodiment 2
[0029] Using an alloy plate with an atomic ratio of Ti and Zr of 70:30 fabricated by the button arc melting method as an anode, an electrolyte containing 0.05 wt% phosphoric acid, 50 wt% ethylene glycol, and water was used at room temperature at 100 V Anodizing was carried out for 2 hours. The film thickness of the oxide film thus formed was measured by a transmission electron microscope to be 190 nm.
[0030] After that, a dispersion liquid of polythiophene as a conductive polymer was coated on the oxide film, and then the coated film was dried to form an electrolyte layer. In addition, graphite paste and silver paste were applied and cured to form a cathode drawing layer to obtain a solid electrolytic capacitor.
[0031] For the obtained solid electrolytic capacitor, capacitance was measured at a frequency of 120 Hz. Leakage current was also measured after applying a direct current voltage of 50 V for 5 minutes.
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Abstract
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