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Solid electrolyte capacitor with ultra-low equivalent series resistance and manufacturing method thereof

A technology of equivalent series resistance and solid electrolysis, which is applied in the direction of solid electrolytic capacitors, electrolytic capacitors, capacitors, etc., can solve the problems of low equivalent series resistance, failure, and instability of polymerization liquid, and achieve high frequency and impedance frequency Good effect

Active Publication Date: 2009-01-21
CHINA ZHENHUA GRP XINYUN ELECTRONICS COMP ANDDEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to overcome the existence of oxidant and monomer in the polymerization liquid formed by the "one-step method" of the prior art, which is prone to polymerization reactions, resulting in unstable polymerization liquid and failure. and overcome the shortcomings of the existing "one-step" production of capacitors with solid electrolytes and outer layers that still have high equivalent series resistance (ESR), and provide a method for manufacturing capacitors with dense polymer layers and outer layers, with extremely approach to solid electrolytic capacitors with low equivalent series resistance (ESR) and very high volumetric efficiency

Method used

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  • Solid electrolyte capacitor with ultra-low equivalent series resistance and manufacturing method thereof
  • Solid electrolyte capacitor with ultra-low equivalent series resistance and manufacturing method thereof
  • Solid electrolyte capacitor with ultra-low equivalent series resistance and manufacturing method thereof

Examples

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Embodiment 1

[0035] Example 1: Select tantalum powder with a CV value of 50,000 μFv / g, press it into a tablet, and sinter it at 1390°C under high temperature and high vacuum to form an anode porous sintered block with a size of 4.3mm×3.1mm×1.2mm containing a tantalum lead (referred to as sintered block), the sintered block is anodized to 33V in dilute phosphoric acid aqueous solution to form a dielectric oxide film layer, and then a polytetrafluoroethylene gasket with insulating properties is placed on the anode lead, and then the oxide film layer is sintered. The block is immersed in the first polymerization solution at a low temperature of 0-10°C. The first polymerization solution contains 2wt% monomer 3,4-ethylenedioxythiophene, 40wt% oxidant iron p-toluenesulfonate, and 0.3% Silane coupling agent, the rest are solvents n-butanol and isopropanol, the weight ratio of n-butanol and isopropanol is 1:1, soak for 6 minutes, take out the sintered block, place it at room temperature for 10 minu...

Embodiment 2

[0037] The tantalum powder with 50,000μFV / g is pressed into a sheet, and then formed into a porous anode body with a size of 4.3mm×3.0mm×0.6mm, and the sintered anode body is anodized to 30V in dilute phosphoric acid aqueous solution, Form a dielectric oxide film layer. Then in situ chemically coat the first electrolyte layer, the second electrolyte layer and the polymer outer layer according to the steps of Example 1, only when making the second electrolyte layer, the polyvinylpyrrolidone of 0.3wt% in the polymer solution is replaced with 0.4% by weight polymethylmethacrylate. When making the outer polymer, 1 wt% of dimethyl sulfoxide NMP in the outer polymer solution was replaced with 1 wt% of DMSO. And through the above impregnation, polymerization, cleaning and re-formation process twice, a polymer outer layer with a thickness of about 20 μm to 50 μm is prepared. Then, a low-temperature conductive graphite layer and a conductive silver paste layer are coated on the outer...

Embodiment 3

[0039] According to Example 1, the anode porous sintered body was made, and a dielectric oxide film was formed on the surface of the sintered body, and then the first electrolyte layer, the second electrolyte layer and the polymer outer layer were chemically coated in situ according to the steps of Example 1, except that the first electrolyte layer Change the impregnation, polymerization, cleaning and re-formation process of the first electrolyte layer to 4 times, change the impregnation, polymerization, cleaning and re-formation process of the second electrolyte layer to 2 times, and add 0.2wt% butyl carbitol and 0.1wt% sodium dodecylbenzenesulfonate were used as surfactants. And add 0.2wt% butyl carbitol and 0.1wt% sodium dodecylbenzenesulfonate in the graphite slurry at the same time as surfactants, complete the graphite, silver paste, complete the welding of the lead frame, and complete the bonding of the resin layer packaged to form an electrolytic capacitor.

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Abstract

The invention relates to a solid electrolytic capacitor and the method for preparing the solid electrolytic capacitor, wherein the solid electrolytic capacitor takes solid conducting high molecular polymer as electrolyte and takes valve metals, such as tantalum, niobium, titanium, aluminum and the like as an anode. The solid electrolytic capacitor is characterized by sufficiently explaining the techniques for the design of the anode, the function assignment, the chemical oxidative in-situ polymerization, the dip-coating graphite silver paste, the making of bottom extraction electrode and the like, with the technical proposal of the invention, a high polymer film, a graphite layer and a silver layer can be compactly combined, the manufactured electrolytic capacitor can be provided with very low equivalent series resistance (ESR), very high volumetric efficiency and good impedance frequency characteristic, the ESR value can be stable in the range of 10KHz-1000KHz, and the requirements of the frequency of a modern electronic equipment can be satisfied.

Description

Technical field: [0001] The invention relates to a solid electrolytic capacitor and its manufacturing method, especially a cube with valve metals such as tantalum, niobium, titanium, and aluminum as the anode, conductive polymer as the electrolyte, the outer surface is packaged with insulating materials, and the lead-out terminals are drawn out from the bottom surface A solid electrolytic capacitor having an ultra-low equivalent series resistance (ESR) and a method of manufacturing the same. Background technique: [0002] With the development of multimedia information processing equipment in the direction of miniaturization, high-speed processing and low power consumption, small components, highly integrated LSIC (high frequency, low voltage) circuits are required, and circuits are required to work intermittently. Therefore, electrolytic capacitors are proposed. A series of new requirements, especially for tantalum electrolytic capacitors, put forward the requirements of lar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/15H01G9/14H01G9/025H01G9/04H01G9/042H01G9/008
Inventor 陆胜方鸣梁正书李仁海黄波
Owner CHINA ZHENHUA GRP XINYUN ELECTRONICS COMP ANDDEV CO LTD
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