Preparing method of thiocyanate functionalized ionic liquid electrolyte

A technology of ionic liquid and thiocyanate, applied in electrolytic capacitors, hybrid capacitor electrolytes, circuits, etc., can solve the problems of organic electrolytes such as flammability, low conductivity, and high viscosity, and achieve low cost, low viscosity, and equipment requirements low effect

Inactive Publication Date: 2014-12-10
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the working voltage of the aqueous electrolyte cannot exceed 1V, and it has the disadvantages of being corrosive and volatile; the organic electrolyte has the disadvantage of being flammable; the ionic liquid [Bmim] BF4, which is commonly used in the electrolyte, has high viscosity and low conductivity. Its conductivity is only 2.94mS / cm at room temperature

Method used

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  • Preparing method of thiocyanate functionalized ionic liquid electrolyte
  • Preparing method of thiocyanate functionalized ionic liquid electrolyte
  • Preparing method of thiocyanate functionalized ionic liquid electrolyte

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preparation example Construction

[0042] The invention is a preparation method of a thiocyanate-functionalized ionic liquid electrolyte, comprising:

[0043] Step 1: Under the protection of nitrogen environment, take amines or phosphorus monomers and add them to the flask, add halogenated alkyl hydrocarbons to the flask dropwise, heat the mixture in the flask after the addition is completed, and raise the temperature to 60-110°C Reflux for another 4-10 hours, cool to room temperature after the reaction, wash with an organic solvent for 3 times to remove unreacted substances, remove the organic solvent by rotary evaporation, heat the product obtained above to 60-80°C and depressurize to 0.1MPa vacuum Dry for 8-12h to obtain the halide ionic liquid intermediate;

[0044] Step 2: Take the halide ionic liquid intermediate prepared above and sodium thiocyanate (NaSCN), mix according to the ratio of molar ratio 1:1-1:5, add molar amount after mixing is 2-10 times of sodium thiocyanate In the acetone solvent, stir m...

Embodiment 1

[0074] Under the protection of nitrogen environment, N-methylimidazole and n-bromoethane were added into the flask according to the molar ratio of 1:1 for mixing, and the mixture was heated to 60°C and then refluxed for 4h. After the reaction was completed, it was cooled to At room temperature, white crystals were obtained. The white crystals were washed 3 times with an organic solvent mixed with acetone and ethyl acetate in a molar ratio of 1:1-1:5 to remove unreacted substances, and then the organic solvent was removed by rotary evaporation, and the obtained The white crystals were heated to 60° C. and dried under reduced pressure to 0.1 MPa in vacuo for 10 h to obtain a white solid, the halide ionic liquid intermediate 1-ethyl-3-methylimidazolium bromide (EmimBr), with a yield of 91%.

[0075] 1-ethyl-3-methylimidazolium bromide and sodium thiocyanate (NaSCN) are mixed according to the ratio of 1:2 according to the molar ratio, after mixing, add molar weight in the acetone ...

Embodiment 2

[0077] Under the protection of nitrogen environment, N-methylimidazole and n-bromoethane were added into the flask according to the molar ratio of 1:1 for mixing, and the mixture was heated to 60°C and then refluxed for 10h. After the reaction was completed, it was cooled to At room temperature, white crystals were obtained. The white crystals were washed 3 times with an organic solvent mixed with acetone and ethyl acetate in a molar ratio of 1:1-1:5 to remove unreacted substances, and then the organic solvent was removed by rotary evaporation, and the obtained The white crystals were heated to 60° C. and dried under reduced pressure to 0.1 MPa for 10 h in vacuum to obtain a white solid, namely the halide ionic liquid intermediate 1-ethyl-3-methylimidazolium bromide (EmimBr), with a yield of 94%.

[0078] Mix 1-ethyl-3-methylimidazolium bromide and sodium thiocyanate according to the ratio of 1:2 in molar ratio, after mixing, add in acetone solvent whose molar weight is 5 time...

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Abstract

A preparing method of a thiocyanate functionalized ionic liquid electrolyte is provided. The method includes: under the protection of a nitrogen atmosphere, mixing an amine or phosphorus monomer and a halogenated alkyl hydrocarbon, heating, refluxing, cooling, drying under vacuum to obtain a halogenated ionic liquid intermediate, adding sodium thiocyanate into the halogenated ionic liquid intermediate, mixing, removing precipitate and a sodium salt respectively by using an acetone solvent and a dichloromethane organic solvent, performing rotary evaporation to remove the acetone solvent and the dichloromethane organic solvent, heating the obtained mixed solution, and drying under vacuum to obtain the thiocyanate functionalized ionic liquid. A room-temperature melt salt comprising an organic cation and the thiocyanate anion, which is synthesized by a two-step synthesis method, is adopted as the electrolyte. The method is characterized by simple operation, low cost, low equipment requirements and capability of large-scale production. The electrolyte is characterized by being non-volatile, non-flammable, low in viscosity, high in conductivity, and adjustable.

Description

technical field [0001] The invention relates to the technical field of ionic liquids, in particular to a preparation method of a thiocyanate-functionalized ionic liquid electrolyte. Background technique [0002] In today's society, a global problem caused by the burning of fossil fuels and global warming - energy storage. Currently developed energy storage technologies that are socially and environmentally friendly include solar cells, lithium-ion batteries, and supercapacitors in the photovoltaic industry. Supercapacitors are new energy storage devices between traditional capacitors and chemical energy storage batteries. Supercapacitors have the characteristics of high specific power density, short charge and discharge time, long cycle life, long energy storage time, and no memory function. Due to the low specific energy density of traditional capacitors and the low specific power density of lithium-ion batteries, supercapacitors have become a research hotspot in high-pow...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D233/58C07D233/06H01G9/035
CPCY02E60/13C07D233/58C07D233/06H01G11/62
Inventor 张利锋宋巧兰刘毅郭守武
Owner SHAANXI UNIV OF SCI & TECH
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