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Mixed-type ionic liquid electrolyte as well as preparation method and application thereof

A technology of ionic liquids and electrolytes, applied in liquid electrolytic capacitors, electrolytic capacitors, circuits, etc., can solve the problems of low conductivity and solubility, high cost, and limitations, and achieve strong ion migration performance, strong electrochemical window, and improved electrical conductivity. The effect of capacity

Inactive Publication Date: 2011-05-25
苏州方光电装备技术 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Solid electrolytes and gel electrolytes have good reliability and no electrolyte leakage, high specific energy, and wide cycle voltage, but most solid electrolytes have low conductivity and solubility at room temperature, which will cause polarization when the capacitor is charged Crystallization of electrolyte salt occurs near the electrodes, therefore, solid electrolytes are limited in electric double layer capacitors
Moreover, the performance of the existing electrolytes in the market is difficult to meet the requirements of high-performance supercapacitors, especially high-voltage and large-capacity capacitors, or most of them are imported, which are expensive and have low market application value.

Method used

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  • Mixed-type ionic liquid electrolyte as well as preparation method and application thereof
  • Mixed-type ionic liquid electrolyte as well as preparation method and application thereof
  • Mixed-type ionic liquid electrolyte as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0034] (1) Ionic liquid BmimPF 6 preparation method

[0035] Ionic liquid BmimPF 6 It has excellent electrochemical performance, its electrochemical window is above 3.5V, and its viscosity is low, it has strong solubility for organic compounds and has hydrophobic characteristics. It is a very ideal new type of "green" solvent that can be used as an electrolyte by itself. . Its synthesis method is as follows:

[0036] 1. Synthesis of intermediate [Bmim]Br

[0037] (1) Add 100ml of refined N-methylimidazole and 160ml of n-butane bromide into a 500ml single-necked bottle, control the reflux temperature of the oil bath to 100°C, and after reflux for 36 hours, cool down and crystallize;

[0038] (2) Add 60ml of acetonitrile and 120ml of ethyl acetate to the crystals after suction filtration, heat in an oil bath (80°C), and reflux for 20min to completely dissolve the white precipitate, filter while it is hot, and cool down to crystallize;

[0039] (3) After repeating the second...

Embodiment 2

[0061] After the preparation of the mixed electrolyte in Example 1 above was completed, five mixed electrolytes with different composition were assembled into simulated supercapacitors. The activated carbon electrode (75mm×12.5m×100μm, the current collector is aluminum foil) is used as the working electrode, the activated carbon electrode (95m×12.5m×100μm, the current collector is aluminum foil) is used as the auxiliary electrode, and the Ag wire electrode is used as the reference electrode. Among them, the activated carbon working electrode is the positive electrode in the actual capacitor product; the auxiliary activated carbon electrode is the negative electrode in the product, and the reference electrode does not appear in the product. Put the activated carbon electrode pole piece and the reference Ag wire electrode into a vacuum drying oven at 140 ° C for 6 hours to dry, then stack the working electrode, auxiliary electrode (positive and negative electrode pieces) and sepa...

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PUM

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Abstract

The invention discloses a mixed-type ionic liquid electrolyte as well as a preparation method and application thereof. The mixed-type ionic liquid electrolyte is prepared by mixing hydrophobic ionic liquid 1-methyl-3-butylimidazolium hexafluorophosphate [BmimPF6] with solid organic electrolyte salt spirocyclic quaternary ammonium tetrafluoroborate (C8H16NBF4) according to the mol ratio of 9:1, 8:2, 7:3, 6:4 or 5:5 and has the advantages of broad electrochemical window, higher electrical conductivity, smaller internal resistance, high cycle efficiency and the like, the hydrophobic performance is excellent, and the performance is outstanding particularly when the proportion is 6:4. The electrolyte disclosed by the invention overcomes the defects of traditional organic electrolytes and other solid electrolytes in application from composition and is an electrolyte which has great development potential and is applicable to super capacitors.

Description

technical field [0001] The invention relates to a mixed type ionic liquid electrolyte, in particular to an ionic liquid electrolyte which can be used for a supercapacitor. Background technique [0002] With its excellent physical and chemical properties, ionic liquids (also known as room temperature ionic liquids), as ideal "green" solvents, new reaction media and "soft" functional materials, have become the most active frontier research field of green chemistry with interdisciplinary fields. one. The excellent electrochemical properties of ionic liquids make them have extremely high application potential in the field of electrochemical research. Supercapacitor is a hot application research hotspot that has risen rapidly in recent years. It is a new type of energy storage element between capacitors and batteries. The main factors that determine the performance of supercapacitors are electrolytes and electrodes, and ionic liquids have a wide electrochemical window. Due to t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/035H01G9/04H01G9/145
CPCY02E60/13
Inventor 魏颖张庆国王道林康振辉蔡克迪金振兴
Owner 苏州方光电装备技术
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