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Double electric layer capacitor electrolytic solution

A technology of electric double-layer capacitors and electrolytes, applied in the field of electrolytes, can solve the problems of low capacitance of pure ionic liquids, increased flammable and explosive risk factors, etc.

Inactive Publication Date: 2013-10-30
OCEANS KING LIGHTING SCI&TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ionic liquids have good development prospects as the electrolyte of electric double layer capacitors, however, the capacitance of pure ionic liquids at room temperature is not high
The purpose of increasing the capacitance is achieved by adding organic solvents (acetonitrile, propylene carbonate, 1-butyrolactone), but the risk factor of flammability and explosion is increased during the use of the capacitor.

Method used

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  • Double electric layer capacitor electrolytic solution
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  • Double electric layer capacitor electrolytic solution

Examples

Experimental program
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Effect test

Embodiment 1

[0028] In a glove box, mix 1-butyl-3-methylimidazolium tetrafluoroboric acid and single-walled carbon nanotube powder at a mass ratio of 1:0.1. After stirring for 30 minutes, the carbon nanotube powder was dispersed in 1-butyl-3-methylimidazolium tetrafluoroboric acid to obtain an electrolyte solution for an electric double layer capacitor.

[0029] figure 1 For the electric double layer capacitor electrolyte that embodiment 1 makes and pure ionic liquid 1-butyl-3-methylimidazolium tetrafluoroboric acid record as the charge-discharge curve contrast figure of electrolyte; Wherein, abscissa is time, vertical Coordinate is voltage, and solid line is the charging and discharging curve of pure ionic liquid 1-butyl-3-methylimidazolium tetrafluoroboric acid as electrolyte, and dotted line is the charging and discharging curve of the electric double layer capacitor electrolyte that embodiment 1 makes as electrolyte. Discharge curve; window voltage is 0-3v, constant current 1A / g;

[...

Embodiment 2

[0032] In a glove box, butylmethylpyrrole tetrafluoroboric acid and multi-walled carbon nanotube powder were mixed in a mass ratio of 1:0.01. After stirring for 10 minutes, the carbon nanotube powder was dispersed in butylmethylpyrrole tetrafluoroboric acid to obtain an electrolyte solution for an electric double layer capacitor.

[0033] The specific capacitance of the electric double layer capacitor electrolyte of the present embodiment as the electrolyte is 69F / g, and the specific capacitance of the pure ionic liquid butylmethylpyrrole tetrafluoroboric acid as the electrolyte is 53F / g; therefore, the specific capacitance ratio under the same conditions 30.1% higher.

Embodiment 3

[0035] In the glove box, the mass ratio of 1-propyl-3-methylimidazolium hexafluorophosphoric acid and carbon nanotube powder (that is, the mass ratio of 1:1 single-walled tube and multi-walled tube mixed carbon nanotube powder) mixed. After stirring for 20 minutes, the carbon nanotube powder was dispersed in 1-propyl-3-methylimidazolium hexafluorophosphoric acid to obtain an electrolyte solution for an electric double layer capacitor.

[0036] The specific capacitance of the electric double layer capacitor electrolyte of this embodiment as the electrolyte is 62F / g, and the specific capacitance of the pure ionic liquid 1-propyl-3-methylimidazolium hexafluorophosphate as the electrolyte is 47.2F / g; Therefore, the specific capacitance is 31.3% higher than that under the same conditions.

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Abstract

The invention belongs to the field of electrolytic solutions, and discloses a double electric layer capacitor electrolytic solution which is characterized by comprising ionic liquid and carbon nano tube powder with the mass ratio of 1:0.001-0.1. The ionic liquid is formed by any one negative ion of imidazolium cation or a pyrrole positive ion and fluoboric acid positive ion, a fluorophosphoric acid negative ion, a diimine (fluoroform sulfonyl) negative ion, an acetic acid negative ion, a methyl organosulfate positive ion, a trifluoroacetic acid negative ion, a trifluoromethane sulfonic acid negative ion, a dicyandiamide negative ion and a trifluoroacetyl trifluoromethanesulfonamide negative ion. The double electric layer capacitor electrolytic solution is formed by the ionic liquid and the carbon nano tube powder in a mixed mode, the negative ions of the ionic liquid can be adsorbed by carbon nano tubes, the carbon nano tubes can promote efficient dissociation of the ionic liquid, the transference number of the ionic liquid is increased, and thus equivalent internal resistance of a double electric layer capacitor is greatly reduced; the carbon nano tubes do not volatilize, so flammable and combustible danger coefficients cannot be increased.

Description

technical field [0001] The invention relates to the field of electrolytes, in particular to an electrolyte for an electric double layer capacitor. Background technique [0002] Electric double layer capacitor is a new type of energy storage device, which has the advantages of high power density, high cycle life, and fast charge and discharge performance. It is widely used in military fields, mobile communication devices, computers, and hybrid power supplies for electric vehicles. As an important part of electric double layer capacitors, the electrolyte has a great influence on the storage performance of electric double layer capacitors, which determines the equivalent internal resistance, working voltage range, storage capacity, working temperature and working environment of the capacitor. [0003] Ionic liquids are organic liquid substances composed entirely of ions at or near room temperature. As a new type of electrolyte, the emergence of ionic liquids has greatly expand...

Claims

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Application Information

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IPC IPC(8): H01G11/64H01G11/62
CPCY02E60/13
Inventor 周明杰邓惠仁王要兵
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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