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Electrolyte for high-voltage super-capacitor and preparation method of electrolyte

A supercapacitor and electrolyte technology, applied in hybrid capacitor electrolyte, hybrid/electric double-layer capacitor manufacturing, etc., can solve problems affecting commercial application and amplification, unobtainable cycle life, unfavorable power density, etc., to achieve low loss, Effects of increased power density and increased usable life

Active Publication Date: 2013-04-03
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the conductivity of organic electrolytes and ionic liquid electrolytes is significantly lower than that of aqueous electrolytes, and the high internal resistance is not conducive to obtaining higher power density, but also cannot obtain good cycle life.
These shortcomings have affected its commercial application and scale-up

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] In an environment with an oxygen content of 0.3PPM and a water content of 0.7PPM, carbon nanotubes with a mass fraction of 1%, a diameter of 0.4nm, and a length of 20nm were added to tetraethylammonium tetrafluoroborate / propylene carbonate , treated in an ultrasonic generator with a power of 30W at 20°C for 50 hours to obtain a new electrolyte whose conductivity is 100% higher than that of pure tetraethylammonium tetrafluoroborate / propylene carbonate. After assembling the capacitor (using single-walled carbon nanotube electrode material, and using PTFE adhesive), the same quality of pure tetraethylammonium tetrafluoroborate / propylene carbonate electrolyte was used in the capacitor (using the same electrode Materials) compared with 4V, when working at 4V, the specific capacitance of the capacitor is increased by 50%, the energy density is increased by 50%, the power density is increased by 100%, the usable power density range is expanded by 100%, and the cycle life is inc...

Embodiment 2

[0022] In an environment with an oxygen content of 0.3PPM and a water content of 0.5PPM, carbon nanotubes with a mass fraction of 0.2%, a diameter of 1-2 nm, and a length of 100 μm were added to N-methylbutylpyrrolidine bistrione In the fluoromethanesulfonimide salt, treat it in an ultrasonic generator with a power of 3000W at 60°C for 5 hours to obtain a new electrolyte whose conductivity is 35% higher than that of pure tetraethylammonium tetrafluoroborate / propylene carbonate . After assembling a capacitor (using double-walled carbon nanotube electrode material), compared with a capacitor using the same mass of pure N-methylbutylpyrrolidine bistrifluoromethanesulfonimide salt electrolyte (using the same electrode material) , When working at 5V, the specific capacitance of the capacitor is increased by 100%, the energy density is increased by 100%, the power density is increased by 100%, the usable power density range is expanded by 100%, and the cycle life is increased by 100...

Embodiment 3

[0024] In an environment with an oxygen content of 0.3PPM and a water content of 0.3PPM, carbon nanotubes with a mass fraction of 0.05%, a diameter of 1-2 nm, and a length of 20 μm were added to 3-ethyl-1-methylimidazole Onium tetrafluoroborate, treated at 40°C for 30 hours in an ultrasonic generator with a power of 800W, a new electrolyte solution was obtained, and its conductivity was higher than that of pure 3-ethyl-1-methylimidazolium tetrafluoroborate Salt increased by 100%. After assembling a capacitor (using double-walled carbon nanotube electrode material), compared with a capacitor using the same mass of pure N-methylbutylpyrrolidine bistrifluoromethanesulfonimide salt electrolyte (using the same electrode material) , When working at 4V, the specific capacitance of the capacitor is increased by 50%, the energy density is increased by 50%, the power density is increased by 200%, the usable power density range is expanded by 100%, and the cycle life is increased by 100%...

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Abstract

The invention discloses an electrolyte for a high-voltage super-capacitor and a preparation method of the electrolyte and belongs to the technical field of super-capacitors. The electrolyte is composed of a traditional electrolyte and a carbon nano-material, and the mass fraction of the carbon nano-material is 0.01%-1%; and the traditional electrolyte is selected from an organic electrolyte or an ionic liquid, and the carbon nano-material is one or more of a carbon nano-tube, nano-graphite and nano-carbon granules. The preparation method of the electrolyte includes in the environments with the oxygen content of 0.1-1 PPM and the water content of 0.1-1 PPM, subjecting the carbon nano-material to ultrasound treatment for 2-50 hours at the temperature of 20-60 DEG C under the power of 30-3000W or stirring the carbon nano-material for 2-50 hours at the rotation speed of 300-40000 revolutions per minute, so that the carbon nano-material can be dispersed in the traditional electrolyte. The electric conductivity of the electrolyte is 1.3-2 times that of the traditional electrolyte, the service life of the capacitor is prolonged, costs are saved, and application ranges of the capacitor are broadened.

Description

technical field [0001] The invention belongs to the technical field of supercapacitors, in particular to an electrolyte solution for high-voltage supercapacitors and a preparation method thereof. Background technique [0002] A supercapacitor is a device that uses the principle of electrochemical capacitance to store energy. It has the advantages of high power density and long service life. or aircraft) backup lighting power supply, and can also be used as a peak-shaving function of the battery. However, compared with lithium-ion batteries, the energy density of supercapacitors is relatively low, and its application in some small and heavyweight vehicles and mobile electronic devices is limited. [0003] Supercapacitors are mainly composed of electrode materials, electrolytes, diaphragms, collective flow, and packaging shells. Although electrode materials are the only substance that produces capacitance, they must be in a certain electrolyte and under a certain voltage. Io...

Claims

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Application Information

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IPC IPC(8): H01G11/64H01G11/84
CPCY02E60/13
Inventor 骞伟中孔垂岩崔超婕余云涛魏飞
Owner TSINGHUA UNIV
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