Solid capacitor carbon foil nano conductive carbon paste and preparation method thereof

Abstract

The invention relates to solid capacitor carbon foil nano conductive carbon paste and a preparation method thereof. The solid capacitor carbon foil nano conductive carbon paste comprises a polymer carrier and a nano conductive carbon fiber system dispersed in the polymer carrier, wherein the polymer carrier is formed by mixing an adhesive, a polymer solvent and a processing aid; the nano conductive carbon fiber system comprises a carbon nano tube and an acidified carbon nano tube acidified by a mixed solution of concentrated nitric acid and concentrated sulfuric acid; the adhesive is one or more of polyester acrylic resin, waterborne polyurethane resin, epoxy acrylic resin and polyurethane resin; the polymer solvent is several in butyl cellosolve, polyoxyethylene alkyl phenyl ether, methylbenzyl alcohol, N, N-dimethylformamide and terpilenol. The nano conductive carbon fiber system is dispersed in the polymer carrier, so that the microscopic coverage compactness of a carbon layer is improved; and the solid capacitor carbon foil nano conductive carbon paste is suitable for a solid capacitor carbon foil, protects a current collector, prevents the surface of the aluminum foil from being oxidized or corroded, and greatly reduces the ESR of a solid capacitor.

Description

technical field [0001] The invention relates to a solid capacitor carbon foil nano conductive carbon paste and a preparation method thereof, belonging to the technical field of solid capacitor carbon foil. Background technique [0002] Solid capacitors are also called solid aluminum electrolytic capacitors. The biggest difference between them and ordinary liquid aluminum electrolytic capacitors is that they use different dielectric materials. The dielectric material of liquid aluminum capacitors is electrolyte, while the dielectric material of solid capacitors is conductive. Permanent polymer, will not interact with alumina, will not explode after electrification, has low ESR and high rated ripple current and is widely used. The solid capacitor cathode foil is made of conductive paste attached to the surface of corroded aluminum foil. Therefore, the uniformity, stability and continuity of the conductive paste are directly related to the surface quality of the finished carbon...

AI Technical Summary

Problems solved by technology

[0003] The conductive carbon paste in the prior art generally uses non-metallic conductor carbon stream particles to be distributed in thermoplastic dispersant solvents. When the proportion of non-conductive components in the matrix of conductive particles reaches a predetermined limit, the conductive particles contact each other to form conductive channels, rubbing resistance The rate drops suddenly, and with the increase of conductive particles, the distance between particles is further reduced to form a conductive network. Since the slurry layer particles spread by point-like carbon particles are close to a single layer, the carbon slurry is easy to agglomerate, and there is insufficient compactness, which makes it difficult to cover continuously. Insufficient affinity with aluminum foil, resulting in rough interface bonding and easy to appear microscopic cracks, which increases the difficulty of the process and limits the acid resistance and oxidation resistance

Images