A kind of preparation method of cathode layer of solid polymer electrolytic capacitor

Abstract

The invention discloses a method for preparing a cathode layer of a solid polymer electrolytic capacitor. The anode body of a solid polymer electrolytic capacitor is alternately immersed in a monomer liquid and an oxidizing liquid. The solvent in the monomer liquid can dissolve the oxidizing agent in the oxidizing liquid, and the oxidizing liquid The solvent in the monomer solution can dissolve the monomer in the monomer liquid. The anode body includes the anode base and the anode lead-out end drawn from the anode base. On the anode lead-out end, the distance from the shoulder of the anode base ≤ 0.5mm is coated or worn with a barrier material; Each dip in the oxidizing solution is dipped twice, and the part is dried after the first immersion. When dipping the monomer solution each time, the anode body is partially immersed, taken out from the monomer solution and then dipped in the oxidizing solution or taken out from the oxidizing solution and then dipped in the monolithic solution. Before removing body fluid, the anode body is dried at a stepwise gradient temperature and then cooled to room temperature. The method can greatly reduce the cross-contamination that exists when immersing the oxidizing solution and the monomer solution, solves the problem of uneven thickness of the polymer film, and can effectively reduce the ESR of the product.

Description

technical field [0001] The invention relates to a method for manufacturing a solid polymer electrolytic capacitor, in particular to a method for preparing a cathode layer of a solid polymer electrolytic capacitor. Background technique [0002] With the rapid development of technology, people have higher and higher requirements for the safety of capacitors. Traditional solid electrolytic capacitors use semiconductor materials (such as manganese dioxide) as cathode materials. The failure mechanism is: due to the large equivalent series resistance of traditional solid electrolytic capacitors, when the leakage current increases, the capacitor generates a lot of heat, resulting in two Manganese oxide degrades to release oxygen, which burns in contact with tantalum metal, which may easily cause flash fire or explosion of the product. However, when conductive polymers such as polythiophene, polypyrrole, polyaniline and their derivatives are used as cathode materials, a large amoun...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to make up for the deficiencies of the above-mentioned prior art, and propose a method for preparing the cathode layer of a solid polymer electrolytic capacitor, which can greatly reduce the cross-contamination that exists in the process of immersing the oxidizing solution and the monomer solution And it solves the problem of different thickness of the polymer film, which can effectively reduce the equivalent series resistance of the solid polymer electrolytic capacitor