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Fluorine-containing surfactant modified graphene preparation method for electrode of electric double-layer capacitor

An electric double layer capacitor and surfactant technology, which is applied in the field of preparation of graphene for fluorine-containing surfactant modified electric double layer capacitor electrodes, can solve the problem of hindering the migration rate of electrolyte ions, failing to effectively improve energy density, stearin Acid electrochemical stability is low and other problems, to achieve the effect of reducing equivalent series internal resistance, good interface compatibility, and cheap raw materials

Inactive Publication Date: 2012-09-26
BOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Its disadvantages are: the electrochemical stability of stearic acid is low, and it is easy to decompose under the operating voltage of the electric double layer capacitor, resulting in a reduction in the service life of the capacitor
The disadvantages are: dendritic compounds are not conducive to the wetting of the graphene surface by the organic electrolyte, and the huge dendritic structure also hinders the migration rate of electrolyte ions between the graphene layers, so it cannot be effectively used as an active material of an electric double layer capacitor. Improve its energy density and reduce the equivalent series internal resistance

Method used

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  • Fluorine-containing surfactant modified graphene preparation method for electrode of electric double-layer capacitor
  • Fluorine-containing surfactant modified graphene preparation method for electrode of electric double-layer capacitor
  • Fluorine-containing surfactant modified graphene preparation method for electrode of electric double-layer capacitor

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Experimental program
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Effect test

Embodiment 1

[0037] Preparation of fluorosurfactant-modified graphene:

[0038] 1. Preparation of graphene oxide dispersion and fluorine-containing surfactant solution

[0039] Add 50mg of graphene oxide powder into 100mL of deionized water, and disperse ultrasonically at a frequency of 20kHz for 48h to obtain a graphene oxide dispersion; add 5mg of sodium perfluorooctanesulfonate (infrared spectrum as figure 1 As shown in c) was added to 10mL of deionized water, and ultrasonically dispersed at a frequency of 20kHz for 6h to obtain a sodium perfluorooctane sulfonate solution;

[0040] 2. Surface modification of graphene oxide

[0041]Add the sodium perfluorooctane sulfonate solution prepared in step 1 into the graphene oxide dispersion, stir at 20°C and 500 rpm for 12 hours, filter with suction, keep the filter cake, and dry it in vacuum at 180°C for 24 hours to obtain perfluorooctane Sodium sulfonate modified graphene oxide powder;

[0042] 3. Reduction of surface-modified graphene ox...

Embodiment 2

[0047] Preparation of fluorosurfactant-modified graphene:

[0048] 1. Preparation of graphene oxide dispersion and fluorine-containing surfactant solution

[0049] Add 50mg of graphene oxide powder into 50mL of deionized water, and disperse ultrasonically at a frequency of 100kHz for 6h to obtain a graphene oxide dispersion; add 10mg of perfluoroalkyl ethoxy ether alcohol to 10mL of deionized water, and Ultrasonic dispersion for 12 hours to obtain perfluoroalkyl ethoxy ether alcohol solution;

[0050] 2. Surface modification of graphene oxide

[0051] Add the perfluoroalkyl ethoxy ether alcohol solution prepared in step 1 into the graphene oxide dispersion, stir at 50°C and 1000rpm for 12h, filter with suction, keep the filter cake, and dry it in vacuum at 160°C for 6h to obtain the complete Fluoroalkyl ethoxy ether alcohol modified graphene oxide powder;

[0052] 3. Reduction of surface-modified graphene oxide

[0053] Wrap the perfluoroalkyl ethoxy ether alcohol-modified...

Embodiment 3

[0056] Preparation of fluorosurfactant-modified graphene:

[0057] 1. Preparation of graphene oxide dispersion and fluorine-containing surfactant solution

[0058] Add 50mg of graphene oxide powder into 25mL of deionized water, and disperse it by ball milling for 12h to obtain a graphene oxide dispersion; add 50mg of perfluorooctyl quaternary ammonium salt into 100mL of deionized water, and disperse with ultrasonic waves at a frequency of 100kHz for 6h, Obtain perfluorooctyl quaternary ammonium salt solution;

[0059] 2. Surface modification of graphene oxide

[0060] Add the perfluorooctyl quaternary ammonium salt solution prepared in step 1 into the graphene oxide dispersion, stir at 100°C and 2000rpm for 6h, filter with suction, keep the filter cake, and vacuum dry at 170°C for 12h to obtain perfluorooctyl quaternary ammonium Salt-modified graphene oxide powder;

[0061] 3. Reduction of surface-modified graphene oxide

[0062] Wrap the perfluorooctyl quaternary ammonium...

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Abstract

The invention discloses a fluorine-containing surfactant modified graphene preparation method for an electrode of an electric double-layer capacitor. The method comprises the following steps of: uniformly dispersing a graphene oxide and a fluorine-containing surfactant into de-ionized water respectively, mixing graphene oxide dispersion and a fluorine-containing surfactant solution, which are obtained by the dispersion, performing modification and suction filtration with stirring, vacuum-drying a filter cake to obtain fluorine-containing surfactant modified graphene oxide powder, adding the fluorine-containing surfactant modified graphene oxide powder into a gaseous reducing agent, and performing reduction reaction to obtain the fluorine-containing surfactant modified graphene. The method has the advantages that a process is simple, raw materials are low in cost and readily available, production cost is low, and the method is suitable for industrial production; by the fluorine-containing surfactant modified graphene, the specific surface area of graphene is enlarged; the prepared fluorine-containing surfactant modified graphene has high electrochemical stability and high fluorine-containing organic electrolyte wettability; and when the fluorine-containing surfactant modified graphene is used for an electrode of a super capacitor, the energy density of the capacitor can be improved, equivalent series resistance can be reduced, and the capacitor has the characteristics of high capacity, low internal resistance and long service life.

Description

technical field [0001] The invention relates to a preparation method of graphene used in electrodes of electric double layer capacitors modified by fluorine-containing surfactant. Background technique [0002] Graphene is a new type of two-dimensional planar nanomaterial with high electrical conductivity and large specific surface area. It is a new type of electrode active material for electric double layer capacitors. However, when graphene is used as an electrode active material of an electric double layer capacitor, due to the strong intermolecular force between graphenes, graphene is prone to recombination, reducing its specific surface area. At the same time, the inert surface structure of graphene hinders the wettability of the electrolyte and the migration rate of conductive ions, resulting in a decrease in the formation efficiency of the electric double layer on the graphene surface and an increase in the equivalent series internal resistance of the electric double l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/058C01B31/04C01B32/184H01G11/86
CPCY02E60/13
Inventor 何铁石金振兴王道林刘国成
Owner BOHAI UNIV
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