Carbon nanometer material based supercapacitor and fabrication method thereof

A technology of carbon nanomaterials and supercapacitors, which is applied in the manufacture of hybrid/electric double layer capacitors, hybrid capacitor electrodes, hybrid capacitor collectors, etc. Advanced problems, to achieve the effect of increasing available types, reducing cost and weight, and increasing volumetric energy density

Active Publication Date: 2016-08-17
JIANGSU ZHONGTIAN TECH CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the pores of this type of current collector are still too large, the amount of liquid absorption is large, the volume energy is not high, and the disadvantages of easy expansion. At the same time, many carbon nanomaterials with large specific areas have poor film-forming properties, which limits their use.
This is not conducive to further improving the performance of related lithium-ion batteries

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Using carbon nanotubes with a diameter of 0.6nm and an aspect ratio of 500 as the electrode material, in an aqueous electrolyte (such as 1mol / L KOH solution), ultrasonication at 20°C and 3kW for 1 minute forms a viscosity of 60,000 centipoise of slurry. The above slurry was vacuumed (10 -2 Pa) to make it enter the current collector (three-dimensional graphene with a porosity of 98%, and a specific surface area of ​​2600m 2 / g. In the pores with a thickness of 40 μm), a composite structure of the electrode material and the current collector is formed. Part of the electrolyte solution in the composite structure was extruded by rolling to make the thickness of the composite structure 20 μm. Fix the above composite structure with the tabs and weld them. Separated by a diaphragm, assembled in multiple pieces, packaged and molded, leaving only one liquid injection port. The above-mentioned formed capacitor is subjected to traditional steps such as degassing and aging, an...

Embodiment 2

[0027] With a thickness of 0.4nm and a sheet area of ​​0.001μm 2 Graphene is used as the electrode material. In an organic liquid electrolyte (acetonitrile solution of tetraethylammonium tetrafluoroborate), ultrasonication is performed at 30°C and 1kW for 10 minutes to form a slurry with a viscosity of 100,000 centipoise. The above slurry was vacuumed (10 -1 Pa) to make it enter the current collector (a carbon nanotube network with a porosity of 95% and a specific surface area of ​​1200m 2 / g. In the pores with a thickness of 600 μm), a composite structure of the electrode material and the current collector is formed. Part of the electrolyte solution in the composite structure was extruded by rolling to make the thickness of the composite structure 400 μm. Fix the above composite structure with the tabs and weld them. Separated by a diaphragm, assembled in multiple pieces, packaged and molded, leaving only one liquid injection port. The above-mentioned formed capacitor is...

Embodiment 3

[0029] With a thickness of 5nm and a sheet area of ​​50μm 2 The mixture of graphene with a diameter of 300nm and carbon nanotubes with an aspect ratio of 0.5 is the electrode material, and the mass ratio of the two is 1:1. In the ionic liquid electrolyte (1-ethyl-3-methyltetrafluoro In imidazole borate), ultrasonication was performed at 60° C. and 0.8 kW for 20 minutes to form a slurry with a viscosity of 300,000 centipoise. The above-mentioned slurry is extruded into a current collector (a carbon nanotube network with a porosity of 70% and a specific surface area of ​​200 m 2 / g. In the pores with a thickness of 100 μm), a composite structure of the electrode material and the current collector is formed. Part of the electrolyte solution in the composite structure was extruded by rolling to make the thickness of the composite structure 70 μm. Fix the above composite structure with the tabs and weld them. Separated by a diaphragm, assembled in multiple pieces, packaged and ...

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Abstract

The invention relates to a carbon nanometer material based supercapacitor and a fabrication method thereof. An electrode material and a current collector of the supercapacitor are both made of carbon nanometer material, and the mass percent of the carbon nanometer material in the supercapacitor accounts for 20-38%. The invention also discloses a fabrication method of the carbon nanometer material based supercapacitor. The fabrication method comprises the following steps of firstly, dispersing the carbon nanometer electrode material in an electrolyte to form paste; secondly, pressing a carbon nanotube network or a three-dimensional graphene material to the porous current collector; thirdly, extruding the paste into the porous current collector in a vacuumizing condition or a pressurizing condition to form a combination structure of the electrode and the current collector; and finally, fixing the carbon material current collector with a tab, separating the combination structure of the electrode and the current collector by a separator, and packaging and forming the supercapacitor. The supercapacitor product obtained by the method has the advantages of high active ingredient content and high volume energy density, is suitably used for a water-based electrolyte, an organic electrolyte and an ionic liquid electrode, and can operate in 1-5V.

Description

technical field [0001] The invention belongs to the technical field of supercapacitor preparation, and in particular relates to a carbon nanomaterial-based supercapacitor and a preparation method thereof. Background technique [0002] Electric double-layer supercapacitors have the advantages of fast charging, long life, and high power density. They play an irreplaceable role in the energy recovery of heavy-duty locomotives and large-scale machinery starting and braking. The recent development trend is to use carbon nanomaterials as electrode materials to replace activated carbon electrode materials, and to operate at higher voltages (3V) in order to obtain higher energy densities and expand the application fields of supercapacitors. [0003] The most traditional capacitor structure is that the electrode material is attached to the metal plate current collector, and then the tabs are welded, and separated by a diaphragm, and the electrolyte is injected to form a capacitive sy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/68H01G11/36H01G11/70H01G11/28H01G11/84
CPCY02E60/13H01G11/68H01G11/28H01G11/36H01G11/70H01G11/84
Inventor 骞伟中田佳瑞余云涛
Owner JIANGSU ZHONGTIAN TECH CO LTD
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