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Solid tantalum electrolytic capacitor and manufacturing method thereof

A tantalum electrolytic capacitor, solid technology, applied in the field of solid tantalum electrolytic capacitors and its preparation, can solve problems such as poor conductivity, achieve the effects of increasing conductivity, increasing working life, and high heat resistance

Inactive Publication Date: 2010-12-22
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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dioxide is regarded as a potential capacitor electrode material, manganese dioxide has poor conductivity and has been replaced by some organic compounds with higher conductivity than manganese dioxide.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

Method used

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  • Solid tantalum electrolytic capacitor and manufacturing method thereof
  • Solid tantalum electrolytic capacitor and manufacturing method thereof
  • Solid tantalum electrolytic capacitor and manufacturing method thereof

Examples

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Embodiment 1

[0035] based on figure 1 Be explained. Wherein, the conductive layer 3 is polythiophene doped with 1wt% magnetic carbon nanotubes, and the magnetic carbon nanotubes are magnetic Fe with a diameter of 10nm evenly attached to the surface. 3 o 4 The particles are multi-walled carbon nanotubes, and the length of the multi-walled carbon nanotubes is 50 μm.

[0036]The preparation method is as follows:

[0037] ① Press nano-tantalum metal particles into blocks, plant cylindrical tantalum wires in the formation of tantalum particles, and sinter them into porous tantalum anode bodies under high temperature and vacuum conditions;

[0038] ② Anodize the sintered tantalum anode body to form a layer of Ta on its surface 2 o 5 Dielectric coating;

[0039] ③ Disperse the magnetic carbon nanotubes evenly in the mixed solution containing oxidant and polythiophene monomer, and then put the tantalum-containing anode body and Ta 2 o 5 The positive substrate of the dielectric coating is i...

Embodiment 2

[0048] The conductive layer 3 is poly(3,4-ethylenedioxythiophene) doped with 5wt% magnetic carbon nanotubes. 2 o 3 The particles are multi-walled carbon nanotubes, and the length of the multi-walled carbon nanotubes is 60 μm.

[0049] The preparation method is as follows:

[0050] ① Press nano-tantalum metal particles into blocks, plant cylindrical tantalum wires in the formation of tantalum particles, and sinter them into porous tantalum anode bodies under high temperature and vacuum conditions;

[0051] ② Anodize the sintered tantalum anode body to form a layer of Ta on its surface 2 o 5 Dielectric coating;

[0052] ③ Evenly disperse the magnetic carbon nanotubes in the mixed solution containing oxidant and poly(3,4-ethylenedioxythiophene) monomer, and then spray the mixed solution on the tantalum-containing anode body and Ta 2 o 5 On the positive substrate of the dielectric coating, a 350mT magnetic field is applied in the vertical direction of the surface of the tant...

Embodiment 3

[0057] The conductive layer 3 is polypyrrole doped with 10wt% magnetic carbon nanotubes, the magnetic carbon nanotubes are single-walled carbon nanotubes with magnetic nickel particles with a diameter of 20nm evenly attached to the surface, and the length of the single-walled carbon nanotubes is 70 μm.

[0058] The preparation method is as follows:

[0059] ① Press nano-tantalum metal particles into blocks, plant cylindrical tantalum wires in the formation of tantalum particles, and sinter them into porous tantalum anode bodies under high temperature and vacuum conditions;

[0060] ② Anodize the sintered tantalum anode body to form a layer of Ta on its surface 2 o 5 Dielectric coating;

[0061] ③ Evenly disperse the magnetic carbon nanotubes in the mixed solution containing oxidant and polypyrrole monomer, and then drop-coat the mixed solution on the tantalum-containing anode body and Ta 2 o 5 On the positive substrate of the dielectric coating, a 400mT magnetic field is a...

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Abstract

The invention discloses a solid tantalum electrolytic capacitor comprising a tantalum anode body, a Ta2O5 dielectric envelope, a conducting layer, a graphite layer and a silver coating, 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 coating are coated on the conducting layer. The solid tantalum electrolytic capacitor is characterized in that the conducting layer is a high-polymer conducting layer doped with magnetic carbon nano tubes, wherein the length directions of the magnetic carbon nano tubes are perpendicular to the surface of the tantalum anode body. Because the directionally arranged magnetic carbon nano tubes are adopted in the conducting layer, the conductivity of the conducting layer is increased, the equivalent series resistance of the capacitor is reduced so that the high-frequency characteristic of the capacitor is improved, and meanwhile, because the carbon nano tubes have excellent thermal conductivity, the capacitor has higher thermal resistance, prolonged service life, and reduced leakage current.

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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/15H01G9/025H01G9/028
Inventor 于军胜周建林胡玉才蒋亚东
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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