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Imidazole ionic liquid as well as preparation method and application thereof

A technology of imidazolium ionic liquid and ionic liquid, applied in electrochemical generators, electrical components, organic electrolytes, etc., can solve the problems of insufficient electrochemical performance of ionic liquids, achieve excellent electrochemical performance, improve electrical conductivity, and facilitate reaction The effect of control

Pending Publication Date: 2020-09-04
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, in the battery, there are still big problems in the compatibility and stability of the electrode materials, mainly because the electrochemical performance of the currently used ionic liquids is not excellent enough.

Method used

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  • Imidazole ionic liquid as well as preparation method and application thereof
  • Imidazole ionic liquid as well as preparation method and application thereof
  • Imidazole ionic liquid as well as preparation method and application thereof

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preparation example Construction

[0052] In addition, this implementation also provides a kind of preparation method of imidazole ionic liquid, comprises the steps:

[0053] Under the protective gas nitrogen atmosphere, dry the reactant before the reaction to remove impurities. First, put 1-vinylimidazole in a drying oven at 60°C for 12 hours, and then dissolve 1-vinylimidazole and chloroalkyl ester in the solvent. , do multiple sets of experiments, the ratio is 1:1.1~1:1.3, and then stir and reflux reaction at 65℃~80℃ for 30~48 hours to obtain the reactant, stop the reaction, rotary evaporate, and the reacted The reaction product was vacuum-dried at 50°C-65°C for 20-30 hours to obtain a yellow transparent viscous liquid and 1-vinyl-3-ester imidazole halide with the following structural formula. Obtain the following structural formula 1-vinyl-3-ester imidazole halide:

[0054]

[0055] R is CH 2 (CH 2 ) a COO(CH 2 ) b CH 3 , a is 0 or 1, b is 0 or 1; Y - for halogen.

[0056] In other preferred em...

Embodiment 1

[0074] Under the protection of nitrogen atmosphere, 0.1 mol of 1-vinylimidazole, 0.1 mol of methyl chloroacetate and 30 ml of acetonitrile were added to a 100 ml three-necked flask, and then stirred and refluxed at 70 ° C for 48 hours to obtain the reactant. After the reaction was stopped, spin Unreacted acetonitrile and methyl chloroacetate were removed by evaporation, and the reacted reaction product was vacuum-dried at 60°C for 24 hours to obtain a yellow transparent liquid: 1-vinyl-3-acetate methyl imidazole chloride.

[0075] In the experiment, the inventor found that after the product (1-vinyl-3-acetate imidazole chloride) was left standing at room temperature for 3 hours, the liquid began to gradually transform into a solid, and the color changed from obvious yellow to off-white solid , if this solid is directly used for the second step of anion exchange, it will be completely insoluble after stirring for 24 hours at room temperature. So need to improve. In the improve...

Embodiment 2

[0087] Under the protection of nitrogen atmosphere, 0.1mol 1-vinylimidazole, 0.11mol methyl chloroacetate and 30ml acetonitrile were added to a 100ml three-necked flask, and then stirred and refluxed at 70°C for 48 hours to obtain the reactant. After the reaction was stopped, spin Unreacted acetonitrile and methyl chloroacetate were removed by evaporation, and the reacted reaction product was vacuum-dried at 60°C for 24 hours to obtain a yellow transparent liquid: 1-vinyl-3-acetate methyl imidazole chloride. In the experiment, it was found that after the product was left standing at room temperature for 3 hours, the liquid began to gradually transform into a solid, and the color changed from obvious yellow to off-white solid. If this solid is directly used for the second step of anion exchange, at room temperature, Complete insolubility was apparent upon stirring for 24 hours. So need to improve. In the improvement measures, the problem of product purification was considered....

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Abstract

The invention relates to imidazole ionic liquid as well as a preparation method and application thereof. The structural formula of the ionic liquid is shown in the specification; R1 is CHCH2, R2 is CH2 (CH2) aCOO (CH2) bCH3, a is 0 or 1, and b is 0 or 1; Y <-> is BF4 <->, PF6 <->, TFSI <->, N (CN) 2 <->, FSI <-> or (FSO2) 2N <->. Functional groups in the imidazole ionic liquid are alkenyl and ester groups, and the alkenyl is introduced to improve the compatibility and stability of an electrolyte and an electrode material. In the preparation process, proper parameters are selected to introducethe ester groups, so that the electrochemical window and electrochemical stability of the ionic liquid are improved, and the conductivity can also be improved. The ionic liquid obtained by the invention is applied to a high-voltage lithium ion battery taking LiNi0.5Mn1.5O4 as a positive electrode material, and the safety, the stability and the electrochemical performance of the lithium ion batterycan be improved.

Description

technical field [0001] The invention relates to the technical field of ionic liquids, and mainly studies functionalized ionic liquids and their application in lithium-ion battery electrolytes. Background technique [0002] Today, energy issues such as energy supply and energy acquisition have become hot topics in today's society. At the same time, fossil fuels represented by burning coal, oil, natural gas and other thermal energy sources also bring about global problems such as air pollution and environmental pollution. Electrochemical energy storage systems, namely batteries, can store chemical energy conveniently and quickly, and can convert the stored energy into devices that can store electrical energy in an efficient and pollution-free manner. [0003] Lithium-ion batteries have become an important part of our lives. Rechargeable lithium-ion batteries have been widely used in electric vehicles, hybrid electric vehicles and consumer electronics due to their advantages ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D233/60C07D233/56H01M10/0568H01M10/0569H01M10/0525
CPCC07D233/60C07D233/56H01M10/0568H01M10/0569H01M10/0525H01M2300/0028H01M2300/0045Y02E60/10
Inventor 张文林马青查刘雪娇张永康杨双丞李春利
Owner HEBEI UNIV OF TECH
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