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

A technology of carbon nanotubes and ionic liquids, applied in the direction of nanotechnology, nanotechnology, nanotechnology, etc. for materials and surface science, can solve the problems of reduced surface area utilization efficiency, reduced capacitance performance, material loss, etc., and achieve preparation costs effect of decrease, increase in tensile strength, and simplification of the compaction process

Active Publication Date: 2012-09-19
TSINGHUA UNIV
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  • Summary
  • Abstract
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  • Application Information

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 utilizati

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] After mixing 1wt% of single-walled carbon nanotubes, 80wt% of double-walled carbon nanotubes and 19wt% of triple-walled carbon nanotubes, they were added to N-methylbutylpyrrolidine bistrifluoromethanesulfonyl Amine salt ionic liquid, wherein the ionic liquid accounts for 15% of the total mass of the mixture. After grinding for 24 hours, compact it to a bulk density of 280kg / m 3 of paper. The resistance of the paper of the above-mentioned carbon nanotubes is 20% lower than that of the paper of carbon nanotubes directly compacted without ionic liquid wrapping; The capacitance value and energy density of the directly compacted carbon nanotube paper are 35% higher; when used in strength materials, the tensile strength is 45% higher than that of the directly compacted carbon nanotube paper without ionic liquid wrapping.

Embodiment 2

[0017] The single-walled carbon nanotubes were added to the N-methylbutylpiperidine bistrifluoromethanesulfonimide ionic liquid at 40°C, wherein the ionic liquid accounted for 19% of the total mass of the mixture. After grinding for 24 hours, compact it to a bulk density of 320kg / m 3 of paper. The resistance of the paper of the above-mentioned carbon nanotubes is 40% lower than that of the paper of carbon nanotubes directly compacted without ionic liquid wrapping; The capacitance value and energy density of the directly compacted carbon nanotube paper are 45% higher; when used in strength materials, the tensile strength is 100% higher than that of the directly compacted carbon nanotube paper without ionic liquid wrapping.

Embodiment 3

[0019] The double-walled carbon nanotubes were added to 1-ethyl-3-methylimidazolium tetrafluoroborate ionic liquid at 80°C, wherein the ionic liquid accounted for 25% of the total mass of the mixture. After grinding for 2 hours, compact it to a bulk density of 380kg / m 3 of paper. The resistance of the paper of the above-mentioned carbon nanotubes is 30% lower than that of the paper of carbon nanotubes directly compacted without ionic liquid wrapping; The capacitance value and energy density of the compacted carbon nanotube paper are both 28% higher; when used in strength materials, the tensile strength is 30% higher than that of the carbon nanotube paper directly compacted without ionic liquid wrapping.

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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...

Claims

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Application Information

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IPC IPC(8): D21H27/18H01G9/042B82Y30/00
CPCY02E60/13
Inventor 骞伟中郑超余云涛崔超婕魏飞
Owner TSINGHUA UNIV
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