Electrolyte and electrical double-layer capacitor

A technology of electric double-layer capacitors and electrolytes, applied in the field of electrochemistry, can solve problems such as large equivalent internal resistance, low capacitance, and limitations, and achieve the goals of saving consumption costs, reducing equivalent internal resistance, and improving conductivity Effect

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 electrical double-layer capacitor
  • Electrolyte and electrical double-layer capacitor
  • Electrolyte and electrical double-layer capacitor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] In the glove box, 1-butyl-3-methylimidazolium hexafluorophosphonate and [(CF 3 ) 2 CHO] 3 N mixed, after stirring for 15 minutes, [(CF 3 ) 2 CHO] 3 N is dissolved in 1-butyl-3-methylimidazolium hexafluorophosphonate; at this time, an electrolytic solution for an electric double layer capacitor is obtained, which contains [(CF 3 ) 2 CHO] 3 N's 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; Wherein, the abscissa is the real part, and the ordinat...

Embodiment 2～24

[0021] Examples 2-24 following table 1

[0022]

[0023]

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Abstract

The invention belongs to the field of electrochemistry, and discloses an electrolyte and a capacitor using the electrolyte. The electrolyte comprises hexafluorophosphate ionic liquid and an aza-ether compound with a molar ratio of 1:(0.001-1):0.05. The invention further provides the electrolyte used for the double-layer capacitor, the electrolyte is formed by mixing the hexafluorophosphate ionic liquid with the aza-ether compound, the aza-ether compound can form a coordination compound with PF6-, and accordingly dissociation level of the hexafluorophosphate ionic liquid is increased, conductivity of the hexafluorophosphate ionic liquid is greatly increased, and equivalent internal resistance of the double-layer capacitor is greatly lowered. The aza-ether compound is used as addictive, the conductivity of the hexafluorophosphate ionic liquid can be improved greatly by only needing less than 5% of the total mass of the hexafluorophosphate ionic liquid, the conductivity of the hexafluorophosphate ionic liquid is improved by adding organic solvent so that the hexafluorophosphate ionic liquid which is low in solubility and is dissolved by a great quantity of organic liquid is dissolved, and usage cost of the electrolyte is greatly saved.

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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