Preparation method for first cathode layer of solid electrolyte capacitor

A technology of capacitor electrodes and solid electrolysis, which is applied in the direction of solid electrolytic capacitors, electrolytic capacitors, capacitors, etc., can solve the problems of poor heat resistance, large contact resistance, weak bonding force between carbon layer and contact layer, etc., and achieve reduction Increased contact resistance and heat resistance, suitable for large-scale application

Active Publication Date: 2009-04-15
福建国光新业科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Carbon paste or graphite milk uses a mixture of graphite and carbon as a conductive metal, water as a solvent, sodium silicate as a binder, ammonia as a suspending agent, and other dispersants, and the bonding between the carbon layer and the contact layer will be weak phenomenon, leading to large contact resistance and poor heat resistance

Method used

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  • Preparation method for first cathode layer of solid electrolyte capacitor

Examples

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Comparison scheme
Effect test

Embodiment 1

[0020] Raw materials: in parts by mass: 30-40 parts of other resin adhesives; 40-50 parts of viscose solvent; 8% by mass of conductive non-metal.

[0021] The conductive non-metal is a mixture of graphite flakes and carbon powder, the weight ratio of graphite flakes to carbon powder in the mixture is 1:8-8:1, wherein the particle diameter of graphite flakes is ≤10 μm, and the particle diameter of carbon powder is ≤5 μm.

[0022] The resin adhesive is a resin with strong bonding force with the conductive polymer layer and the silver paste layer, and may be one or more of epoxy resin, acrylic resin, polymethyl methacrylate or polyurethane resin.

[0023] The viscous solvent is an organic solvent having the same polarity as the conductive polymer film, and the organic solvent may be one or more of cyclohexanone, butyl acetate or butyl carbitol acetate.

[0024] Mix the raw materials uniformly according to the weight ratio to make graphite milk; cover the electrode that needs to p...

Embodiment 2

[0026] The mass content of conductive non-metal is 15%, and the remaining steps are as in Example 1.

Embodiment 3

[0028] The mass content of conductive non-metal is 30%, and the remaining steps are according to Example 1.

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Abstract

The invention aims at providing a preparation method of a first cathode layer of an electrode of a solid electrolytic capacitor; the preparation raw materials of a cathode consist of a conductive non-metal, a resin adhesive and an adhesive solvent; the preparation steps are as follows: the raw materials are evenly mixed to prepare preparation emulsion of the cathode layer; the electrode which needs to prepare the first cathode layer adopts the impregnation method in the preparation emulsion to cover a first cathode carbon layer, the air drying at the room temperature, the drying and the curing are carried out to prepare the first cathode layer; the method adopts resin as the adhesive and adopts the organic solvent as the solvent, thereby improving the binding force between the carbon layer and a polymer layer and between the carbon layer and a silver paste layer, reducing the contact resistance and increasing the heat resistance; furthermore, the raw materials are reasonable, and the preparation steps are simple, thereby being suitable for large-scale popularization and application.

Description

technical field [0001] The invention belongs to the field of preparation of solid electrolytic capacitors, and more specifically relates to a method for preparing a first cathode layer of an electrode of a solid electrolytic capacitor. Background technique [0002] The valve metal of solid capacitors is generally made of aluminum, niobium, titanium, tantalum, etc., niobium, etc., the carbon layer is used as the first cathode layer, and the silver layer is used as the second cathode layer. One function of the carbon layer is to prevent the direct contact between the silver paste and the polymer, resulting in silver migration and increasing the leakage current; on the other hand, as a transition layer, it can not only reduce the direct contact resistance between the silver layer and the polymer, thereby reducing the ESR of the capacitor , It can also prevent the silver from being oxidized by the oxide in the conductive polymer layer, thereby reducing the ESR of the capacitor. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/042H01G9/048H01G9/15
Inventor 陈素晶张易宁
Owner 福建国光新业科技股份有限公司
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