Electrolyte and double-electric-layer capacitor

A technology of electrolyte and ionic liquid, which is applied in the field of electrochemistry, can solve the problems of large equivalent internal resistance, increased cost, and low capacitance, and achieve the effects of improving conductivity, saving dosage cost, and reducing equivalent internal resistance

Inactive Publication Date: 2013-03-06
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, resulting in the equivalent internal resistance of electric double-layer capacitors using pure ionic liquids as electrolytes. Big
Hexafluorophosphonate ionic liquid is currently one of the most commonly used ionic liquid electrolytes because of its easy synthe

Method used

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  • Electrolyte and double-electric-layer capacitor
  • Electrolyte and double-electric-layer capacitor
  • Electrolyte and double-electric-layer capacitor

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0017] Example 1

[0018] In the glove box, 1-butyl-3-methylimidazolium hexafluorophosphonate and (C 6 h 3 F)O 2 B(C 6 h 3 f 2 ) mixed, after stirring for 20 minutes, (C 6 h 3 F)O 2 B(C 6 h 3 f 2 ) is dissolved in 1-butyl-3-methylimidazolium hexafluorophosphonate; at this time, an electrolyte for an electric double layer capacitor is obtained, which contains (C 6 h 3 F)O 2 B(C 6 h 3 f 2 ) of 1-butyl-3-methylimidazolium hexafluorophosphonate electrolyte.

[0019] In this embodiment, the test of equivalent internal resistance: use graphene as the electrode material, use each embodiment as the electrolyte, assemble into a capacitor, in this embodiment it is a button battery, and use CHI660A electrochemical workstation to conduct AC impedance Test, directly read the equivalent internal resistance from the AC impedance spectrum.

[0020] figure 1 It is the AC impedance spectrum of the capacitor that adopts the electrolytic solution in the embodiment 1 to make; Wh...

Example

[0021] Embodiment 2~24 see following table 1

[0022]

[0023]

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Abstract

The invention belongs to the field of electrochemistry and discloses electrolyte and a double-electric-layer capacitor. The electrolyte comprises hexafluorophosphate ionic liquid and fluorinated alkyl boride in the molar ratio of 1:0.001-1:0.05. The electrolyte for the double-electric-layer capacitor is obtained by mixing the hexafluorophosphate ionic liquid with the fluorinated alkyl boride, and the fluorinated alkyl boride and PF6- can form a complex, so that the dissociation degree of the hexafluorophosphate ionic liquid is increased, conductivity of the electrolyte is increased greatly, and equivalent internal resistance of the double-electric-layer capacitor is lowered greatly. The fluorinated alkyl boride is used as additives, the conductivity of the electrolyte is increased greatly only with the fluorinated alkyl boride accounting for not more than 5% of the total mass of the electrolyte, and if organic solvents are added to increase the conductivity, a great amount of organic liquid is needed to dissolve the hexafluorophosphate ionic liquid low in dissolvability, so that consumption cost of the electrolyte is saved greatly.

Description

technical field [0001] The invention relates to the field of electrochemistry, in particular to an electrolyte. The invention also relates to an electric double layer capacitor using the electrolytic solution. 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 the electric double layer capacitor, the electrolyte has a great influence on the storage performance of the electric double layer capacitor, which determines the 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 emergen...

Claims

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Application Information

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