Conductive high polymer, oxidizer for synthesis thereof and solid capacitor

Abstract

The invention provides an oxidizer solution for conductive high polymer synthesis. The oxidizer solution for conductive high polymer synthesis can be mixed with a polymerized monomer and is used for impregnating a capacitor core package to generate a conductive high polymer through reaction so as to be used for producing a high-performance solid electrolytic capacitor. The oxidizer solution for conductive high polymer synthesis comprises iron sulfonate and solvent, wherein the solvent is lower alcohol and cyclic ether, and the lower alcohol is selected from one or some of monobasic alcohol of which the carbon atom number is 1-4; and the number of oxygen groups of an ether bond in the cyclic ether is 1 or 2, and the ring containing the ether bond is a five-membered one or six-membered one. By using the oxidizer to synthesize a conductive high molecular polymer, the conductivity of the conductive polymer can be improved, thereby reducing the ESR (equivalent series resistance) value of a capacitor.

Description

technical field [0001] The present invention relates to a solid electrolytic capacitor, a conductive polymer used as the electrolyte of the solid electrolytic capacitor, and an oxidant solution used for synthesizing the conductive polymer. Background technique [0002] At present, the oxidants used to polymerize conductive polymers are mainly alkylaromatic sulfonate iron salts, which have good effects in polymerizing monomers such as pyrrole, aniline, and thiophene, and the obtained conductive polymers are widely used. Used in solid electrolytic capacitors, anti-static coatings, LEDs, printed circuit boards and other fields. In particular, PEDOT obtained by oxidatively polymerizing 3,4-ethylenedioxythiophene (EDOT) with ferric p-toluenesulfonate has attracted much attention in the industry because of its high conductivity and high stability. [0003] However, the polymerization reaction speed of alkyl aromatic sulfonic acid iron salt and EDOT is too fast, which is not condu...

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Problems solved by technology

The polymerization speed of EDOT is too fast, which is not conducive to the crystallization of PEDOT, resulting in loose polymer and poor structural regularity, which is not conducive to improving the conductivity

[0004] U.S. Patent US4910645 uses a large amount of solvent to dilute the conductive polymer monomer, so that the monomer concentration is lower than 10wt%. The capacitor core can be wrapped in the mixed solution of oxidant and monomer and directly impregnated to realize in-situ polymerization, but only A very small amount of conductive high molecular polymer needs to be impregnated repeatedly 16 times to produce enough conductive high molecular polymer, so the manufacturing process of capacitors will be very complicated

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