Electrolyte and preparation method thereof

An electrolyte and ionic liquid technology, applied in the field of electrolytes, can solve the problems of reduced stability of electric double-layer capacitors, corrosion of aluminum foil of double-layer capacitors, etc., and achieve the effects of increasing stability, improving stability and reducing costs.

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

Tetrafluoroborate ionic liquids are one of the more promising ionic liquid electrolytes because of the low cost of raw materials. However, tetrafluoroborate ionic liquids are very hygroscopic. During the electrochemical cycle, tetrafluoroborate The water absorbed by the ionic liquid will participate in the motor reaction to generate acid, and the acid will corrode the aluminum foil of the double-layer capacitor, resulting in a decrease in the stability of the electric double-layer capacitor using tetrafluoroborate ionic liquid as the electrolyte

Method used

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  • Electrolyte and preparation method thereof
  • Electrolyte and preparation method thereof
  • Electrolyte and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0058] The alkyldiimine compound is added into the tetrafluoroborate ionic liquid, and stirred until dissolved to obtain an electrolytic solution.

[0059] In this embodiment, the alkyldiimine compound is N,N'-dicyclohexylcarbodiimide, the tetrafluoroborate ionic liquid is 1-ethyl-3-methylimidazolium tetrafluoroborate, The mass ratio of the tetrafluoroborate ionic liquid to the alkyldiimine compound is 1:0.05.

[0060] In this embodiment, when preparing the electrolyte, it is carried out in a glove box, and N, N'-dicyclohexylcarbodiimide is added to 1-ethyl-3-methylimidazolium tetrafluoroborate and stirred for 10-60 Minutes to dissolve N,N'-dicyclohexylcarbodiimide in 1-ethyl-3-methylimidazolium tetrafluoroborate.

[0061] The above electrolytic solution was applied to a double layer capacitor and the stability of the double layer capacitor was measured.

[0062] When testing the stability, use graphene as the electrode material, use the electrolyte prepared in Example 1, as...

Embodiment 2 18

[0065] In Embodiments 2 to 18, the alkyldiimine compound is added into the tetrafluoroborate ionic liquid, and stirred until dissolved to obtain an electrolyte solution. When preparing the electrolyte, it was carried out in a glove box.

[0066] In Examples 2 to 18, alkyldiimine compounds, tetrafluoroborate ionic liquids, ratios of tetrafluoroborate ionic liquids and alkyldiimine compounds, stirring time, and after 1000 cycles See Table 1 for the specific capacitance retention rate and the ratio of specific capacitance retention rate improvement.

[0067] Formulation and test data of electrolyte in table 1 embodiment two to eighteen

[0068]

[0069]

[0070] In embodiment two to eighteen, the specific capacitance retention ratio measurement condition is identical with embodiment one; The obtained use of the corresponding tetrafluoroborate ionic liquid without adding the alkyldiimine compound as the percentage of the increase in the specific capacitance retention rate ...

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Abstract

An electrolyte comprises tetrafluoroborate ionic liquid and an alkyl diimine compound dissolved in the tetrafluoroborate ionic liquid. The mass ratio of the tetrafluoroborate ionic liquid and the alkyl diimine compound is 1 :( 0.001-1):0.05. In the electrolyte, the added alkyl diimine compound can be combined with an H bondof water molecules, and accordingly water is prevented from participating in an electrode reaction so as not to produce acid to corrode aluminum foil of a double-layer capacitor, stability of the double-layer capacitor using the tetrafluoroborate ionic liquid as the electrolyte can be greatly improved, the stability of the double-layer capacitor using the electrolyte can be greatly improved by adding the alkyl diimine compound, and cost is lowered.

Description

【Technical field】 [0001] The invention relates to an electrolytic solution, in particular to an electrolytic solution containing tetrafluoroborate ionic liquid and a preparation method thereof. 【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 electric double layer capacitors, the electrolyte has a great influence on the storage performance of electric double layer capacitors, which determines the equivalent internal resistance, 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. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/64H01G11/84
CPCY02E60/13
Inventor 周明杰邓惠仁王要兵
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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