Macromolecular polymerization tantalum capacitor cathode preparation method

Abstract

The invention discloses a macromolecular polymerization tantalum capacitor cathode preparation method, and aims at providing a method for carrying surface pretreatment on anode tantalum blocks before the preparation of conducting macromolecular polymerization layers for improving the quality of PEDOT (poly(3,4-ethylenedioxythiophene)) conducting films. The method adopts the technical scheme that the anode tantalum blocks attached with Ta2O5 dielectric oxide films on the surfaces are soaked into pretreatment liquid with the conductivity being 30 to 100 muS / cm, and are taken out at a speed being 1 to 2mm / min after being soaked for 5 to 15 minutes; the pretreatment liquid is prepared from the following ingredients in percentage by volume: 1 to 10 percent of silane coupling agents, 0.5 to 5 percent of glacial acetic acid and 85 to 98.5 percent of water. The method has the advantages that the bonding performance between electric dielectric films and polymerization layers is enhanced, in addition, the uniformity and the compactness of the PEDOT conducting films are improved, and the contact resistance among interfaces is reduced. A capacitor manufactured by adopting the method has low ESR (efficient serial connection resistance) and small leakage current.

Description

technical field [0001] The invention relates to a preparation method of a solid electrolytic tantalum capacitor, in particular to a preparation method of a conductive polymer polymer tantalum capacitor cathode. Background technique [0002] At present, one-step or two-step methods are usually used to prepare polymer tantalum capacitor cathodes. The former is to attach Ta 2 o 5 The anode tantalum block of the dielectric oxide film is immersed in the polymerization solution formed by mixing the conductive polymer monomer, dopant, oxidizing agent and solvent, and then polymerized to form a conductive polymer film; the latter is the anode tantalum block Immerse in a solution containing a conductive polymer monomer and an oxidizing agent respectively, and then polymerize to form a conductive polymer film. Whether it is a one-step method or a two-step method, it must go through the impregnation process of the solution; and Ta 2 o 5 The dielectric oxide film is hydrophobic, so...

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Problems solved by technology

Whether it is a one-step method or a two-step method, it must go through the impregnation process of the solution; and Ta 2 o 5 The dielectric oxide film is hydrophobic, so when the anode tantalum block is directly immersed in the polymerization solution, it is difficult to form a dense conductive polymer layer on its surface; Large contact resistance makes the equivalent series resistance (ESR) of the product larger

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