Ionic liquid coated paper of thin-walled carbon nanotube and preparation method of ionic liquid coated paper

Abstract

The invention belongs to the technical field of conducting materials and discloses an ionic liquid coated paper of a thin-walled carbon nanotube and a preparation method of the ionic liquid coated paper. An ionic liquid in the paper of carbon nanotubes is evenly coated on the outer surfaces of the carbon nanotubes to form a coaxial structure, and then the carbon nanotubes are mutually lapped to form a net structure. The paper of the carbon nanotubes is prepared by the steps that firstly 15wt% to 30wt% of ionic liquid and the thin-walled carbon nanotube are subjected to dispersion mill, and then are compacted. The ionic liquid can have functions of dispersing the thin-walled carbon nanotube, opening tube bundles of the thin-walled carbon nanotube and serving as an adhesive. Compared with resistance of papers of thin-walled carbon nanotubes, which are directly compacted without using the ionic liquid, the resistance of the prepared paper of the thin-walled carbon nanotube is reduced by 20-40%, when the paper is used as an electrode material of a supercapacitor at a voltage of 4-6.5 volts, the performances of the supercapacitor are improved by 20-100%, and when the paper is used as a strength material, the tensile strength is improved by 20-100%. Besides, the preparation method has the advantages of being low in cost and easy to repeat and amplify.

Description

technical field [0001] The invention belongs to the technical field of conductive materials, and in particular relates to a thin-walled carbon nanotube paper wrapped in ionic liquid and a preparation method thereof. Background technique [0002] Thin-walled carbon nanotubes have recently been gradually used as electrode materials for supercapacitors due to their perfect structure, high chemical stability, large specific surface area, good electrical conductivity, and large aspect ratio. Compared with the porous inner surface characteristics of traditional activated carbon electrode materials, the surface of thin-walled carbon nanotubes presents an outer cage structure, which is especially suitable for the diffusion of electrolyte ions. This feature makes it more suitable for high-voltage capacitor systems with larger plasma sizes such as organic electrolytes or ionic liquid electrolytes. For example, when the thin-walled carbon nanotubes are made into a gel with a mass frac...

AI Technical Summary

Problems solved by technology

However, due to the small diameter of the thin-walled carbon nanotubes, the van der Waals force between the tubes is very strong, and the densely packed thin-walled carbon nanotubes will cause them to attract each other into bundles, thereby reducing the pore size, making it difficult for the electrolyte ion to diffuse, and its surface area utilization efficiency. reduced, the capacitive performance degrades

In addition, the density of thin-walled carbon nanotubes is small, and it is not easy to compact during direct compaction, and a small amount of thin-walled carbon nanotubes will fly into the air, which not only causes material loss, but also may pollute the environment or harm human health.