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 method is characterized in that the polystyrolsulfon acid is replaced with polyanions such as sulfonated polystyrene block copolymer, acidified polystyrene block copolymer or sulfonated polystyrene graft copolymer, the rigid structure of PSS is improved through modification, the PEDOT structure is granted with a certain flexibility, so performance of a PEDOT / PSS film is improved, a problem that high-temperature resistance, low-temperature resistance and repeated charge anddischarge resistance of the capacitor due to the PSS structure are inferior to the in-situ polymerization method is solved, the polyanions such as the sulfonated polystyrene block copolymer, the acidified polystyrene block copolymer or the sulfonated polystyrene graft copolymer are added simultaneously, the emulsification effect is better, formed milk droplets are smaller, the prepared PEDOT dispersion has a smaller particle size and higher electrical conductivity, triggering the capacitor capacity is made to be easier, and an ESR value of the prepared capacitor is smaller.

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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