Preparation method for first cathode layer of solid electrolyte capacitor

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. ...

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

Images