Method for manufacturing polymer ethylenedioxythiophene (PEDT) cathode plate type tantalum electrolytic capacitor by two-step method

Abstract

The invention discloses a method for manufacturing a polymer ethylenedioxythiophene (PEDT) cathode plate type tantalum electrolytic capacitor by a two-step method. The cathode plate type tantalum electrolytic capacitor is manufactured by adopting the two-step method. The two-step method is a method which comprises the following steps of: impregnating an oxidizing agent at the first time, impregnating a monomer at the second time, and polymerizing the oxidizing agent and the monomer to prepare PEDT so as to manufacture the cathode plate type tantalum electrolysis capacitor, wherein the whole process is performed under normal temperature. The manufacturing method comprises the following steps of: A, adding a certain amount of adhesive agent into tantalum powder, and stamping and molding themixture, sintering the treated mixture at high temperature to volatilize the adhesive agent and effectively adhere the tantalum powder so as to form a multi-hole tantalum anode plate, and applying direct-current voltage in acidic solution, so that the surface of the tantalum powder is oxidized to generate an amorphous dielectric layer Ta2O5; B, repeatedly immersing the anode plate with the dielectric layer in the oxidizing agent and monomer solution for reaction so as to form a conducting polymer PEDT layer with a certain thickness, namely a cathode; and C, immersing the anode block with the PEDT layer in graphite and silver slurry respectively, curing respectively at high temperature, and performing assembly, plastic package, aging test and labeling to package a capacitor product.

Description

technical field [0001] The invention relates to a method for manufacturing a tantalum capacitor, in particular to a method for manufacturing an ultra-low ESR value PEDT cathode chip tantalum electrolytic capacitor; it belongs to the technical field of power electronic devices. Background technique [0002] Capacitors are generally devices that store charge and electrical energy consisting of electrodes made of two conductors that are close to each other and insulated from each other. It is widely used in DC blocking, coupling, bypass, filtering, tuning loop, energy conversion, control circuit and so on. [0003] Chip solid tantalum electrolytic capacitors use the valve metal T tantalum as the positive electrode, and form an amorphous structure on the surface of the tantalum through anodic oxidation. 2 o 5 layer as a dielectric, plus a negative electrode layer. At present, domestic chip tantalum electrolytic capacitors are all made of MnO 2 As the negative electrode, the ...

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problem that the existing tantalum capacitor has a high ESR and the negative electrode contains high oxygen, which will cause the entire capacitor to catch fire and burn when it fails to break down, and proposes a new manufacturing method for tantalum electrolytic capacitors. The tantalum electrolytic capacitor fabrication method can reduce the need for Ta 2 o 5 The destruction of the dielectric layer can significantly reduce the ESR of the capacitor (minimum up to 4mΩ), and improve the high frequency characteristics of the capacitor

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