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Carbon nanometer electrode material for super capacitor and preparation method thereof

A technology for supercapacitors and electrode materials, applied in capacitors, electrolytic capacitors, circuits, etc., can solve problems such as poor dispersion effect, long processing steps, and high cost, and achieve the effects of shortened, simplified, and low-cost preparation steps

Active Publication Date: 2014-09-24
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the effect of high temperature leads to the agglomeration of the obtained structure, and the dispersion effect in the ionic liquid electrolyte is not good. At the same time, this method has long processing steps, low yield and high cost.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] 1 wt% of single-walled carbon nanotubes (0.8 nm to 1.2 nm in outer diameter and 50 nm in length), 80 wt% of double-walled carbon nanotubes (1.8 nm to 4 nm in outer diameter and 100 μm in length) and 19 wt% single-layer graphene (with a size of 3300 nm 2 ) was added to the N-methylbutylpyrrolidine bistrifluoromethanesulfonimide salt ionic liquid at 60 °C, and the total weight of all carbon nanometer electrode materials was controlled to be 20% of the ionic liquid. In an environment with an oxygen content of 0.1 ppm and a water content of 0.1 ppm, mechanical stirring at a rate of 100 rpm for 24 hours is sufficient. A supercapacitor is prepared by scraping the mixture of carbon nanometer electrode material and ionic liquid. When operating at 6.5 V, the energy density based on carbon nanoelectrode material is 200 Wh / kg.

Embodiment 2

[0017] 10 wt% of single-walled carbon nanotubes (0.8 nm to 2.3 nm in outer diameter and 100 μm in length) and 70 wt% of double-walled carbon nanotubes (3 nm to 6 nm in outer diameter and 50 μm in length) and 20 wt% bilayer graphene (with a size of 900 μm 2 ) was added to the N-methylbutylpiperidine bistrifluoromethanesulfonimide salt ionic liquid at 40 °C, and the total weight of all carbon nanometer electrode materials was controlled to be 1% of the ionic liquid. In an environment with an oxygen content of 0.3 ppm and a water content of 0.3 ppm, grind for 14 hours and extrude with a screw extruder. A supercapacitor is prepared by scraping the mixture of carbon nanometer electrode material and ionic liquid. When operating at 5.5 V, the energy density based on carbon nanoelectrode material is 145 Wh / kg.

Embodiment 3

[0019] 49 wt% of single-walled carbon nanotubes (0.8 nm-1.2 nm in outer diameter, 30 μm in length), 1 wt% of double-walled carbon nanotubes (2 nm-5 nm in outer diameter, 30 μm in length) and 50 wt% single-layer graphene (with a size of 9 μm 2 ) was added to the 1-ethyl-3-methylimidazolium tetrafluoroborate ionic liquid at 80 °C, and the total weight of all carbon nanoelectrode materials was controlled to be 13% of the ionic liquid. In an environment with an oxygen content of 0.2 ppm and a water content of 0.3 ppm, mechanically stir at a rate of 4000 rpm for 6 hours, and then extrude through a screw extruder. A supercapacitor is prepared by scraping the mixture of carbon nanometer electrode material and ionic liquid. When working at 4.2 V, the energy density based on carbon nanoelectrode material is 96 Wh / kg.

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Abstract

The invention discloses a carbon nanometer electrode material for a super capacitor and a preparation method thereof. The carbon nanometer electrode material is formed by hybridization of a single-wall carbon nanometer tube or a double-wall carbon nanometer tube and 1-3 layers of graphene. The carbon nanometer electrode material is prepared by placing the single-wall carbon nanometer tube or the double-wall carbon nanometer tube and 1-3 layers of graphene in ionic liquid and performing stirring, ultrasound or squeezing on the liquid. The preparation method is few in procedures, free of impurities, small in loss, high in purity and low in cost and can prepare the high-performance nanometer electrode material for the super capacitor in batch mode. The manufactured super capacitor can work under the voltage of 4v-6.5v, and energy density based on the carbon nanometer electrode material can reach as high as 220Wh / kg.

Description

technical field [0001] The invention belongs to the technical field of conductive materials, and in particular relates to a carbon nanometer electrode material used for a supercapacitor and a preparation method thereof. Background technique [0002] A supercapacitor is a device that uses the principle of electrochemical capacitance to store electrical energy. It has the advantages of high power density and long service life. ships or airplanes), backup lighting power supply, etc. However, compared with lithium-ion batteries, the energy density of supercapacitors is relatively low, and its application in vehicles and mobile electronic devices is limited to a certain extent. [0003] The current commercial electrode material is mainly activated carbon, but activated carbon can only be used in capacitors with an operating voltage of less than 3 V. Single-walled carbon nanotubes, double-walled carbon nanotubes, and 1-3-layer graphene have stable chemical structures, large spec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G9/042
Inventor 骞伟中余云涛郑超孔垂岩崔超婕许骛然魏飞
Owner TSINGHUA UNIV
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