Novel dispersion liquid for solid capacitor, capacitor and preparation method thereof

Abstract

The invention discloses a novel dispersion liquid for a solid capacitor, a capacitor and a preparation method thereof. The present invention selects polyanions such as sulfonated polystyrene block copolymers, acidified polystyrene block copolymers, and sulfonated polystyrene graft copolymers to replace polystyrene sulfonic acid, and improves the rigid structure of PSS through modification. Endows the PEDOT structure with a certain degree of flexibility, thereby improving the performance of the PEDOT / PSS film, and solving the problems of the high temperature resistance, low temperature resistance, and repeated charge and discharge resistance of the capacitor caused by the PSS structure. Polyanions such as polystyrene block copolymers, acidified polystyrene block copolymers, and sulfonated polystyrene graft copolymers have better emulsification effects, smaller emulsion droplets, and the particle size of the prepared PEDOT dispersion It is smaller and has higher conductivity, which makes it easier to extract the capacitor capacity, and the ESR value of the prepared capacitor is lower.

Description

technical field [0001] The invention relates to the technical field of capacitors, in particular to a novel dispersion liquid for solid capacitors, a capacitor and a preparation method thereof. Background technique [0002] An electrolytic capacitor generally consists of a porous metal electrode, an oxide layer on the surface of the metal serving as a dielectric, a conductive material introduced into the porous structure, and the like. Commonly used electrolytic capacitors include tantalum electrolytic capacitors, niobium electrolytic capacitors, aluminum electrolytic capacitors, etc., the anode of which is formed by anodic oxidation to have a uniform oxide dielectric layer; a liquid or solid electrolyte forms the cathode of the capacitor. In addition, aluminum capacitors in which the anode electrode is made of valve metal aluminum on which a uniform and electrically insulating aluminum oxide layer is formed as a dielectric by anodization are also commonly used, and a liquid...

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Problems solved by technology

However, the current capacitors prepared with PEDOT / PSS dispersion also have major disadvantages: (1) The long-term high-temperature stability of the capacitor is poor (poor high-temperature resistance), especially the capacitance and the equivalent series resistance (ESR) change significantly at high temperatures. Poor; (2) Affected by the particle size, the lead-out rate of capacitor capacity is lower than that of liquid capacitors; (3) Low temperature resistance and repeated charge and discharge resistance are worse than in-situ polymerization methods

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