Electrolyte of supercapacitor, preparation method and performance

A technology for supercapacitors and electrolytes, applied in the manufacture of hybrid capacitor electrolytes, hybrid/electric double layer capacitors, etc., can solve the problems of not being able to improve the high temperature performance of supercapacitors, and take into account difficulties, so as to save purification time and cost, and reduce production costs , The effect of saving environmental protection costs

Active Publication Date: 2020-06-02
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, low boiling point esters cannot improve the high temperature performance of supercapacitors
In practical applications, the low temperature performance is related to whether it can be started smoothly, while the high temperature performance is related to whether the gas is produced and the safety of the device. It is difficult to balance the two

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Tetraethylammonium tetrafluoroborate with a water content of 3%, and high-boiling hydrocarbons (the mass ratio of α-methylnaphthalene to β-methylnaphthalene is 1:4), in a mass ratio of 1:9, at 20 Mechanically mix for 1 minute at ℃, then add a low boiling point compound (toluene and benzene, mass ratio 1:1) in the mixed solution that is 100 times the total mass of water, stir for 60 minutes, then distill at 40℃, absolute pressure 50kPa for 24 hours . Then it was distilled at 140° C. and an absolute pressure of 10 kPa for 24 hours. When the mass concentration of the low-boiling point compound in the electrolyte is less than 10PPm, it is cooled to normal temperature under the protection of nitrogen to obtain the electrolyte of the supercapacitor, which is sealed and stored in an environment isolated from water and oxygen.

[0024] When the electrolyte solution obtained in this example is used in a supercapacitor, it is used at -40 to 120°C and 4V. At -40°C, the capacitan...

Embodiment 2

[0026] The N-methylbutylpyrrolidine bistrifluoromethanesulfonimide salt with a water content of 0.01% and the trimethylpropylammonium bistrifluoromethanesulfonimide salt with a water content of 0.01% are firstly mixed in a mass ratio of 1 : 1 mixed, and then with high boiling point hydrocarbons (50% α-methylnaphthalene, 19% β-methylnaphthalene, 1% quinoline, 4% isoquinoline, 3% indole, 3% biphenyl, 10% Dimethylnaphthalene, 0.5% acenaphthene, 5.5% oxyfluorene and 4% fluorene), mechanically mixed at 50° C. for 30 minutes at a mass ratio of 1:1, and then added 10 times the total mass of water in the mixed solution. The boiling point compound (methanol and ethanol, mixed in a mass ratio of 3:1), after stirring for 1 minute, was distilled at 50°C and an absolute pressure of 50kPa for 8 hours. Then it was distilled at 100° C. and an absolute pressure of 80 kPa for 8 hours. When the mass concentration in the electrolyte is less than 10PPm, it is cooled to normal temperature under th...

Embodiment 3

[0029] 3-ethyl-1-methylimidazolium tetrafluoroborate with a water content of 1%, tetraethylammonium tetrafluoroborate with a water content of 1%, tetramethylammonium tetrafluoroborate with a water content of 0.5% Ammonium, mixed with the mass ratio of the three substances at a ratio of 2:1:1, and then mixed with high-boiling point hydrocarbons (76% α-methylnaphthalene, 19% β-methylnaphthalene, 5% biphenyl) at 50 ° C mechanically Mix for 20 minutes, then add low-boiling compound (ethanol) 20 times the total mass of water in the mixed solution, stir for 10 minutes, then distill for 1 hour at 50° C. and an absolute pressure of 50 kPa. Then it was distilled at 100°C and absolute pressure 10kPa for 1 hour. When the mass concentration of the low-boiling point compound in the electrolyte is less than 10PPm, it is cooled to normal temperature under the protection of argon to obtain the electrolyte of the supercapacitor, which is sealed and stored in an environment isolated from water ...

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PUM

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Abstract

The invention discloses an electrolyte of a supercapacitor, a preparation method and performance, the electrolyte is composed of an ionic liquid and high boiling point hydrocarbons, and the mass ratioof the ionic liquid to the electrolyte is 10%-50%; according to the method, the ionic liquid with high water content can be used for directly preparing the high-purity electrolyte. The electrolyte has the characteristics of low cost, wide voltage window, excellent low-temperature performance and high-temperature performance and the like.

Description

technical field [0001] The invention belongs to the technical field of supercapacitors, and in particular relates to an electrolyte solution, a preparation method and properties of a supercapacitor. Background technique [0002] An electric double layer capacitor is a device that utilizes the directional movement of charges under voltage to store energy. It has the advantages of high power density, long service life, and safety. It can be used as a storage of unstable currents (such as wind energy and tidal energy), and large-scale The backup lighting power supply of vehicles (such as ships or airplanes) can also be used as the peak-shaving function of the battery. However, compared with lithium-ion batteries, the energy density of capacitors is relatively low, and its application in some small and heavyweight vehicles and mobile electronic devices is limited. [0003] Increasing the operating voltage of a capacitor can significantly increase its operating density, but the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/58H01G11/62H01G11/84
CPCH01G11/58H01G11/62H01G11/84Y02E60/13
Inventor 金鹰骞伟中崔超婕魏少鑫于翔
Owner TSINGHUA UNIV
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