A kind of preparation method of solid aluminum electrolytic capacitor with high electrostatic capacity

Abstract

A preparation method of a solid aluminum electrolytic capacitor with high electrostatic capacity, comprising the following steps: 1) winding an anode foil, an electrolytic paper and a cathode foil into a core package; 2) dissolving a conductive high molecular polymer in a first solvent or dispersing After being in the first dispersion liquid, the core pack is impregnated in the first solvent or the first dispersion liquid; 3) the upper part of the core pack is removed in step 2) the impregnated first solvent or the first dispersion liquid; 4) the core contains Immersion in a second solvent compatible with the first solvent or the first dispersion; 5) drying. In the present invention, by impregnating the core pack in the second solvent, the conductive polymer formed on the core pack is more uniform, thereby improving the conductivity of the solid electrolyte and reducing the ESR value of the core pack; When the two solvents are used, the conductive polymer can further penetrate into the core package, thereby increasing the electrostatic capacity of the solid aluminum electrolytic capacitor.

Description

technical field [0001] The invention relates to an aluminum electrolytic capacitor, in particular to a preparation method of a solid aluminum electrolytic capacitor with high electrostatic capacity. Background technique [0002] With the digitization of electronic instruments, the miniaturization of electronic components has been paid more and more attention; as far as capacitors are concerned, it is mainly characterized by small size and large capacity. At present, in order to obtain low ESR in solid aluminum electrolytic capacitors, conductive polymers such as polypyrrole, polythiophene, and polyaniline and their derivatives are generally used as electrolytes. The traditional practice is that the core contains a dispersion of immersed conductive high molecular polymer or the polymerization reaction of conductive high molecular monomer is carried out on the core package. [0003] At present, the polymerization reaction on the core pack is rarely used, because the impuritie...

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Problems solved by technology

[0003] At present, the polymerization reaction on the core pack is relatively seldom, because the impurities introduced by the polymerization reaction, such as oxidants, are difficult to remove; in addition, the addition of oxidants has a greater impact on the dielectric on the surface of the anode foil, which is easy to damage the dielectric and cause leakage current. happened

However, the method of impregnating the dispersion liquid of the conductive polymer is relatively difficult to impregnate due to the relatively large molecular weight of the conductive polymer, and it is difficult to form a homogeneous conductive polymer film in the depth of the core package, making The capacity of solid aluminum electrolytic capacitors is low. In order to meet the capacity requirements, manufacturers can only achieve the goal by increasing the size of the capacitor; thus affecting the miniaturization of electronic components