Solid tantalum electrolytic capacitor and manufacturing method thereof

Abstract

The invention discloses a solid tantalum electrolytic capacitor. The capacitor comprises a tantalum anode body, a Ta2O5 dielectric envelope, a conducting layer, a graphite layer and a silver-coated layer, wherein the Ta2O5 dielectric envelope is positioned on the surface of the tantalum anode body; the conducting layer is positioned on the Ta2O5 dielectric envelope; and the graphite layer and the silver-coated layer are coated on the conducting layer. The capacitor is characterized in that: the conducting layer is a mixed system consisting of a composite carbon nano-tube and a conducting high molecular material; the composite carbon nano-tube is a carbon nano-tube of which the surface is attached to conductive nano-particles and magnetic nano-particles uniformly; and the length direction of the composite carbon nano-tube is vertical to the surface of the tantalum anode body. Directionally-arrayed composite carbon nano-tubes are adopted in the conducting layer, so that the conductivity of the conducting layer is enhanced, the equivalent series resistance of the capacitor is reduced and the high-frequency characteristic of the capacitor is improved; simultaneously, the carbon nano-tube has high thermal conductivity, so that the capacitor has higher heat resistance, the service life of the capacitor is prolonged and the leakage current is reduced.

Description

technical field [0001] The invention relates to the technical field of capacitors, in particular to a solid tantalum electrolytic capacitor and a preparation method thereof. Background technique [0002] In recent years, with the downsizing and weight reduction of electronic devices, small and high-capacity high-frequency capacitors are required, so solid electrolytic capacitors in which a solid electrolytic layer is formed of a solid conductive compound have been proposed. [0003] A solid electrolytic capacitor includes, for example, an Al (aluminum) or Ta (tantalum) metal anode body, a dielectric oxide film formed by oxidation treatment on the surface of the anode body, and a solid conductive compound such as MnO 2 (manganese dioxide), conductive high molecular polymer to the oxide film, and the cathode layer in close contact with the oxide film. Compared with paper dielectric capacitors and film capacitors, electrolytic capacitors are smaller in size and higher in capac...

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Problems solved by technology

[0007] Although manganese dioxide is regarded as a potential capacitor electrode material, manganese dioxide has poor conductivity and has been replaced by some organic compounds with higher conductivity than manganese dioxide. The electrolyte resistance R has a great influence on the high frequency characteristics of the capacitor, therefore, it is necessary to use a higher conductivity electrolyte to increase the performance of the capacitor

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