Imidazoles ionic liquid and ionic liquid electrolytic solution, and preparation methods and applications thereof

A technology of ionic liquids and imidazoles, which is applied in the manufacture of electrolyte batteries, sulfonate salts, sulfonic acid amides, etc., can solve the problems of low specific capacity and conductivity of ionic liquids, limited applications, etc., and achieve excellent electrochemical performance. , the reaction is easy to control, the effect of safety is good

Inactive Publication Date: 2014-05-14
OCEANS KING LIGHTING SCI&TECH CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Traditional ionic liquids used in the field of electrochemistry generally have low specific capacity and low conductivity, which limits their further application.

Method used

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  • Imidazoles ionic liquid and ionic liquid electrolytic solution, and preparation methods and applications thereof
  • Imidazoles ionic liquid and ionic liquid electrolytic solution, and preparation methods and applications thereof
  • Imidazoles ionic liquid and ionic liquid electrolytic solution, and preparation methods and applications thereof

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preparation example Construction

[0049] In addition, this embodiment also provides a preparation method of imidazole ionic liquid, such as figure 1 shown, including the following steps:

[0050] Step S110, under a protective gas atmosphere, according to the molar ratio of 3-methylimidazole and haloalkane in the ratio of 1:1.05 to 1:1.2, stirring and reacting 3-methylimidazole and haloalkane at 60-80°C to obtain 1-methoxyalkyl 3-methylimidazolium halides of the following structural formula:

[0051]

[0052] Among them, RX is haloalkane, R is CH 3 O(CH 2 ) n , n is 2, 3 or 4, X is halogen.

[0053] The obtained product containing 1-methoxyalkyl 3-methylimidazole halide can be washed with ethyl acetate for 2 to 3 times, and then dried under vacuum at 80°C to obtain purified 1-methoxyalkyl-3-methylimidazole imidazolium halides.

[0054] In other preferred embodiments, the molar ratio of 3-methylimidazole to alkyl halide is 1:1.2.

[0055] Step S120, stirring and reacting 1-methoxyalkyl 3-methylimidazol...

Embodiment 1

[0073] Add 1mol 3-methylimidazole and 1.1mol methoxyl ethyl chloride respectively in the flask of 250mL, obtain mixture; 2Under the protection of the atmosphere, the above mixture was stirred and reacted at 70°C for 40 hours to obtain a reaction product; the above reaction product was left to cool to room temperature, and then washed three times with ethyl acetate; the reaction product washed with ethyl acetate Place it at 80°C and dry it under vacuum to obtain a light yellow solid, which is 1-methoxyethyl 3-methylimidazolium chloride salt. Calculate the yield, and the yield is 82%.

[0074] Add 0.53mol NaBF to a 250mL flask 4 , 130 mL of deionized water and 0.5 mol of the 1-methoxyethyl 3-methylimidazolium chloride salt prepared above to obtain a mixed solution; the above mixed solution was stirred and reversed at room temperature for 8 hours to obtain a reacted solution; Extract the reacted solution with 250 mL of dichloromethane three times, combine the extract phases, an...

Embodiment 2

[0077] In a 250mL flask, 1mol 3-methylimidazole and 1.05mol methoxybromopropane were respectively added to obtain a mixture; under the protection of Ar atmosphere, the above mixture was stirred and reacted at 60°C for 60 hours to obtain a reaction product; The above reaction product was left to cool to room temperature, and then washed three times with ethyl acetate; the reaction product washed with ethyl acetate was vacuum-dried at 80°C to obtain a light yellow solid, namely 1-methoxypropyl 3-Methylimidazolium bromide; calculated yield, the yield was 80%.

[0078] Add 0.5mol KPF to a 250mL flask 6 , 100 mL of deionized water and 0.5 mol of the 1-methoxypropyl 3-methylimidazolium bromide prepared above to obtain a mixed solution; stirring the above mixed solution at room temperature for 20 hours to obtain a reacted solution; Extract the reacted solution with 250 mL of dichloromethane three times, combine the extract phases, and then back-extract with 60 mL of deionized water ...

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Abstract

The invention relates to an imidazoles ionic liquid having the following structural formula defined in the description, wherein R represents CH3O(CH2)n, n is 2, 3 or 4, and Y<-> represents BF4<->, PF6<->, (CF3SO2)2N<-> or CF3SO3<->. The imidazoles ionic liquid has lower melting point than a traditional alkyl imidazoles ionic liquid; moreover, introduction of methoxy alkyl allows the imidazoles ionic liquid to have a functionalizated ether bond, and the ability of the imidazoles ionic liquid to dissolve corresponding substances can be increased; at the same time, the imidazoles ionic liquid also has common advantages of ionic liquids. The invention also provides a preparation method of the imidazoles ionic liquid. The preparation method has the advantages of simple process, easily controlled reaction and higher product yield, and is suitable for industrialized production. In addition, the imidazoles ionic liquid has excellent electrochemical performance, and can be used for preparation of an electrolytic solution of a lithium ion battery.

Description

technical field [0001] The invention relates to the technical field of ionic liquids, in particular to an imidazole ionic liquid, an ionic liquid electrolyte, a preparation method and an application. Background technique [0002] Ionic liquids (Ionic liquids) refer to ionic compounds that are liquid at room temperature (generally below 100°C) and composed of organic cations and inorganic anions. As early as 1914, people discovered the first ionic liquid, nitroethylamine, but the research progress of ionic liquids was slow. Until 1992, the research team led by Wikes synthesized a ionic liquid with low melting point, hydrolysis resistance and stability. Ionic liquids with strong and other advantages—1-ethyl-3-methylimidazolium tetrafluoroborate ([EMIM]BF 4 ), the research on ionic liquids developed rapidly, and a series of ionic liquid systems were subsequently developed. [0003] Ionic liquids have a series of outstanding advantages: (1) The melting point is lower than or c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D233/60C07C309/06C07C303/32C07C303/40C07C311/48H01M10/0568H01M10/058
CPCC07D233/60H01M10/0568H01M10/058Y02E60/10Y02P70/50
Inventor 周明杰刘大喜王要兵钟辉
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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