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Ionic liquid with high electrochemical stability and preparing method thereof

An ionic liquid and electrochemical technology, applied in the direction of organic chemistry, can solve the problems of low electrochemical stability and hinder the application of ionic liquid, and achieve the effect of good electrochemical stability, high refractive index, and wide electrochemical window

Inactive Publication Date: 2008-07-02
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the low electrochemical stability of ionic liquids (electrochemical window <4V) has become a major obstacle to the further application of ionic liquids in the field of electrochemistry.

Method used

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  • Ionic liquid with high electrochemical stability and preparing method thereof
  • Ionic liquid with high electrochemical stability and preparing method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0038] Synthesis of N-methyl-N-butyronitrile pyrrolidine chloride salt

[0039] Weigh 21.30g (0.25mol) of N-methylpyrrolidine and dissolve it in 50ml of absolute ethanol. After stirring at room temperature to make it fully mixed, add 31.1g of chlorobutyronitrile (0.30mol) to the above solution, and at 70°C The reaction was continued for 48 h under magnetic stirring, the solvent ethanol and other volatile components were removed by rotary evaporation, 40 ml of ethyl acetate was added for recrystallization, the resulting white solid was washed three times with anhydrous ether, filtered with suction, and the solid was evacuated at 100 °C for 8 Hours, the ionic liquid N-methyl-N-butyronitrile pyrrolidinium chloride was obtained with a yield of 88.4%.

Embodiment 2

[0041] Synthesis of N-methyl-N-butyronitrile pyrrolidine bis(perfluoroalkylsulfonyl)imide salt

[0042] Weigh 18.9 g (0.1 mol) of N-methyl-N-butyronitrile pyrrolidinium chloride salt and dissolve it in 50 ml of distilled water, and add 43.0 g (0.15 mol) of bis(perfluoroalkylsulfonyl)imide lithium salt under stirring at room temperature , after reacting for 4 hours, let it stand, separate layers, separate the lower oil phase with a separatory funnel, wash with distilled water for 3 times, and vacuumize at 100 ° C for 4 hours to obtain a colorless liquid N-methyl-N-butyronitrile Pyrrolidine bis(perfluoroalkylsulfonyl)imide salt, the yield is 78.2%, and the electrochemical window is 5.4V.

Embodiment 3

[0044] Synthesis of N-methyl-N-butyronitrile pyrrolidine tetrafluoroborate

[0045]Weigh 18.9 g (0.1 mol) of N-methyl-N-butyronitrile pyrrolidine chloride salt and dissolve it in 50 ml of absolute ethanol, add 16.5 g (0.15 mol) of sodium tetrafluoroborate under stirring at room temperature, and continue stirring for 48 hours. After aging and filtering, the filtrate was evaporated to dryness to obtain white solid N-methyl-N-butyronitrile pyrrolidine tetrafluoroborate with a yield of 86.1% and an electrochemical window of 5.3V.

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Abstract

The invention discloses a functional ionic liquid that has high electrochemical stability and a preparation method thereof. Positive ion of the ionic liquid is selected from nitrile-functionalized quaternary ammonium positive ion and negative ion thereof from one of chlorine, bromine, iodine, fluoborate, fluorophosphates, sulfate radical, nitrate radical, trifluoroacetic radical, trifluorochloromethane sulfonic acid group, bi (perfluoroalkyl group sulfonyl) imino negative ion, dinitrile amic radical and saccharin acid radical. Nitrile functional ionic liquid, the negative ion of which is halogen negative ion, is firstly prepared through reaction of pentagons or hexatomic tertiary amine with the alkyl halide that has nitrile functional groups, then ionic liquid that contains different negative ions is prepared by exchange of the negative ions. The ionic liquid has very low melting temperature, can bear the high temperature of 150 DEG C and be stable to water, hardly has vapor pressure but has good electrochemical stability, thereby the invention can be taken as solvent, catalyst ligand, electrochemical electrolyte, etc. that are applied in the fields of organic synthesis, catalytic reaction and lithium-ion battery, etc.

Description

technical field [0001] The invention relates to a functionalized ionic liquid with high electrochemical stability and a preparation method thereof, belonging to the technical field of new chemical materials and their preparation. Background technique [0002] Ionic liquids generally refer to substances that are liquid at room temperature or near room temperature and are composed of relatively large organic cations and relatively small inorganic or organic anions. They are also commonly referred to as room temperature ionic liquids. Compared with traditional molecular media, ionic liquids have many distinct physical and chemical properties, such as low melting point, wide liquid range, no vapor pressure, high conductivity, wide electrochemical window, designability, etc. These unique properties that other traditional media do not have make ionic liquids become "solid" liquids with dual functions and characteristics of liquid and solid, thus showing great potential and applica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D295/15
Inventor 邓友全张庆华陈正件王瑞峰杨静
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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