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Electrolyte for capacitor and capacitor using electrolyte

An electrolyte and capacitor technology, applied in the field of electrochemistry, can solve the problems of increasing the risk factor of flammable and explosive, low capacitance of pure ionic liquid, etc. Effect

Active Publication Date: 2012-10-31
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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  • Electrolyte for capacitor and capacitor using electrolyte
  • Electrolyte for capacitor and capacitor using electrolyte
  • Electrolyte for capacitor and capacitor using electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] In a glove box, mix 1-butyl-3-methylimidazolium tetrafluoroborate and silver nanoparticles at a mass ratio of 1:0.01. After stirring for a period of time for 10 minutes, the silver nanoparticles were dissolved in 1-butyl-3-methylimidazolium tetrafluoroborate to obtain an electrolyte solution for an electric double layer capacitor.

[0023] The test shows that the equivalent internal resistance of the electric double layer capacitor using the electrolyte in this embodiment is 28Ω, which is higher than that of the pure ionic liquid measured under the same conditions, i.e. 1-butyl-3-methylimidazolium tetrafluoroboric acid The equivalent internal resistance of the electric double layer capacitor with salt as the electrolyte is 72.5% lower.

[0024] figure 1 For the AC impedance spectrum of the capacitor that adopts the electrolytic solution in the embodiment 1 to make; Wherein, the abscissa is the imaginary part, and the ordinate is the real part; As can be seen from the f...

Embodiment 2~56

[0025] Embodiment 2~56 see following form:

[0026]

[0027]

[0028]

[0029]

[0030]

[0031] Note: In the table,

[0032] 1. A means ionic liquid, B means silver nanoparticles;

[0033] 2. The equivalent internal resistance reduction ratio is the equivalent internal resistance of the electric double layer capacitor using the electrolyte of the corresponding embodiment in the corresponding embodiment compared to the equivalent internal resistance of the electric double layer capacitor using the pure ionic liquid measured under the same conditions the percentage of reduction;

[0034] 3. In Examples 2-56, various preparation process and test conditions are the same as those in Example 1.

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PUM

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Abstract

The invention belongs to the field of electrochemistry and discloses an electrolyte for a capacitor and the capacitor using the electrolyte. The electrolyte comprises ionic liquid and nano-silver particles in a mass ratio of (1:0.001)-(1:0.01). The electrolyte has the following beneficial effects that the electrolyte is prepared through the mixture and reaction of the ionic liquid and the nano-silver particles; and after the ionic liquid and the nano-silver particles are mixed, the internal resistance of the electrolyte is reduced in the presence of silver ions, and the silver ions are partially reduced to silver simple substances in the charge-discharge process and the silver simple substances are relatively stable and can uniformly attach to the gaps of electrode materials to reduce the internal resistance of the electrode materials, thus greatly reducing the equivalent internal resistance of the electrical double layer capacitor.

Description

technical field [0001] The invention relates to the field of electrochemistry, in particular to a capacitor electrolyte. The invention also relates to a 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 emergence of ionic li...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/038H01G9/155
CPCY02E60/13
Inventor 周明杰邓惠仁王要兵
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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