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Super capacitor and preparation method thereof

A supercapacitor and electrolyte technology, applied in the manufacture of hybrid/electric double-layer capacitors, hybrid capacitor electrodes, hybrid capacitor current collectors, etc., can solve the problems of poor film-forming performance, low volume energy, and large liquid absorption , to achieve the effect of increasing the available species, increasing the volumetric energy density, and increasing the 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.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Using carbon nanotubes with a diameter of 0.6nm and an aspect ratio of 1000 as the electrode material, in an aqueous electrolyte (such as 6mol / L KOH solution), ultrasonication at 20°C and 1kW for 30 minutes forms a viscosity of 15,000 centipoise of slurry. The above slurry was vacuumed (10 -1 Pa) to make it enter the carbon-coated foam silver current collector (the mass fraction of carbon is 0.1%, and the structure is Sp 2 hybridization. The porosity of the current collector is 96%, and the composite structure of the electrode material and the current collector is formed in the pores with a thickness of 500 μm. Part of the electrolyte solution in the composite structure was extruded by rolling to make the thickness of the composite structure 400 μm. The above composite structure is welded to the aluminum lug. Separated by a diaphragm, assembled in multiple pieces, packaged and molded, leaving only one liquid injection port. The above-mentioned formed capacitor is s...

Embodiment 2

[0029] With a thickness of 0.35nm 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 50°C and 1kW for 10 minutes to form a slurry with a viscosity of 20,000 centipoise. The above slurry was vacuumed (10 -1 Pa) to make it enter the pores of the carbon-coated nickel foam current collector (the mass fraction of carbon is 5%, and the structure is Sp2 hybridization. The porosity of the current collector is 70%, and the thickness is 300 μm) to form an electrode Composite structure of materials and current collectors. Part of the electrolyte solution in the composite structure was extruded by rolling to make the thickness of the composite structure 250 μm. The above-mentioned composite structure is welded with silver tabs. Separated by a diaphragm, assembled in multiple pieces, packaged and molded, leaving only one liquid inject...

Embodiment 3

[0031] With a thickness of 2nm and a sheet area of ​​25μm 2 The mixture of graphene with a diameter of 200nm and carbon nanotubes with an aspect ratio of 1 is the electrode material, and the mass ratio of the two is 1:1. In the ionic liquid electrolyte (1-ethyl-3-methylimidazole bis Trifluoromethanesulfonimide salt) was ultrasonicated at 60° C. and 0.8 kW for 20 minutes to form a slurry with a viscosity of 340,000 centipoise. The above-mentioned slurry is extruded (1MPa) to make it enter the carbon-coated copper foam current collector (the mass fraction of carbon is 1.5%, and the structure is Sp2 hybridization. The porosity of the current collector is 90%, In the pores with a thickness of 300 μm), a composite structure of the electrode material and the current collector is formed. Part of the electrolyte in the composite structure was extruded by rolling to make the thickness of the composite structure 220 μm. The above composite structure is welded with copper lugs. Separa...

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Abstract

The invention provides a super capacitor and a preparation method thereof. An electrode material for the super capacitor is a carbon nanoelectrode material; a current collector is carbon-coated porous metal; and the mass fraction of a carbon nano-material in the super capacitor is 20%-35%. The invention further discloses the preparation method. The preparation method comprises the following steps: dispersing the carbon nanoelectrode material into an electrolyte to form slurry; extruding the slurry into the porous current collector in a vacuum supply condition or a pressurized condition to form a composite structure of an electrode and the current collector; and finally welding the current collector and a metal tab, partitioning the composite structure of the electrode and the current collector by a diaphragm and carrying out packaging and molding. The super capacitor product obtained by the method has the advantages of being high in effective ingredient content, high in volume energy density and suitable for an aqueous electrolyte, an organic electrolyte and an ionic liquid electrolyte, and can be operated at 1-5V.

Description

technical field [0001] The invention belongs to the technical field of supercapacitor preparation, and in particular relates to a supercapacitor with a carbon nanometer electrode and a carbon nanometer current collector 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 th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/36H01G11/68H01G11/86H01G11/84B82Y30/00B82Y40/00
CPCY02E60/13H01G11/36B82Y30/00B82Y40/00H01G11/68H01G11/84H01G11/86
Inventor 骞伟中田佳瑞余云涛
Owner JIANGSU ZHONGTIAN TECH CO LTD
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