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Electrolyte and preparation method thereof

A preparation method and electrolyte technology, applied in the electrolyte field, can solve the problems of easy pyrolysis, reduced stability of electric double layer capacitors, unstable acetate, etc.

Inactive Publication Date: 2015-10-28
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

However, during the electrochemical cycle of acetate-based ionic liquids, the acetate group is unstable and easily pyrolyzed, resulting in a decrease in the stability of electric double-layer capacitors using acetate-based ionic liquids as electrolytes.

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] The electrolyte solution can be obtained by adding the fluoroalkyl phosphite into the acetate-based ionic liquid and stirring until dissolved.

[0059] In this embodiment, the fluoroalkyl phosphite is tris(2,2,2-trifluoroethyl) phosphite, and the acetate-based ionic liquid is 1-ethyl-3-methylimidazole acetate, The mass ratio of acetate-based ionic liquid to tris(2,2,2-trifluoroethyl)phosphite is 1:0.03.

[0060] In this embodiment, when preparing the electrolyte, it is carried out in a glove box, adding tris(2,2,2-trifluoroethyl) phosphite into 1-ethyl-3-methylimidazole acetate and stirring for 10 ~60 minutes to dissolve tris(2,2,2-trifluoroethyl)phosphite in 1-ethyl-3-methylimidazole acetate.

[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, assemble it into...

Embodiment 2 18

[0065] In Examples 2 to 18, the fluoroalkyl phosphite is added into the acetate-based ionic liquid, and stirred until dissolved to obtain an electrolyte. When preparing the electrolyte, it was carried out in a glove box.

[0066] In Examples 2 to 18, the ratio of fluoroalkyl phosphite, acetate ionic liquid, acetate ionic liquid to fluoroalkyl phosphite, stirring time, and specific capacitance retention after 1000 cycles See Table 1 for the rate and ratio of specific capacitance retention.

[0067] Electrolyte formula and test data in table 1 embodiment two to eighteen

[0068]

[0069]

[0070]

[0071] In embodiment two to eighteen, the specific capacitance retention ratio measurement condition is identical with embodiment one; The obtained use of the corresponding acetate-based ionic liquid without adding fluoroalkyl phosphite as the percentage of the increase in the specific capacitance retention of the double-layer capacitor as the electrolyte.

[0072] As can ...

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Abstract

An electrolyte comprises acetate ionic liquid and fluoroalkane phosphate dissolved in the acetate ionic liquid. The mass ratio of the acetate ionic liquid and the fluoroalkane phosphite is 1:(0.001-1):0.05. In the electrolyte, the added fluoroalkane phosphite can form a coordination compound with acetate through an electron pair, thermal decomposition reaction of the acetic radical is suppressed, and accordingly stability of a double-layer capacitor using the acetate ionic liquid as the electrolyte can be improved, the stability of the double-layer capacitor using the electrolyte can be improved by adding the fluoroalkane phosphite, and cost is lowered.

Description

【Technical field】 [0001] The invention relates to an electrolytic solution, in particular to an electrolytic solution containing an acetate 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. As an ...

Claims

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Application Information

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Patent Type & Authority Patents(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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