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Pyrrole ionic liquid, and preparation method and application thereof

A technology of ionic liquid and pyrrole, which is applied in the field of supercapacitors, pyrrole-based ionic liquids and their preparation, can solve problems such as easy decomposition, reduced capacitance, and increased internal resistance of capacitors, achieving good thermal stability, high decomposition voltage, The effect of high conductivity

Inactive Publication Date: 2013-03-06
OCEANS KING LIGHTING SCI&TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, under high voltage conditions, the traditional aqueous electrolyte is easy to decompose, causing the internal resistance of the capacitor to increase sharply and the capacitance to decrease rapidly

Method used

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  • Pyrrole ionic liquid, and preparation method and application thereof
  • Pyrrole ionic liquid, and preparation method and application thereof
  • Pyrrole ionic liquid, and preparation method and application thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0039] A preparation method of the above-mentioned pyrrole-based ionic liquid, the preparation process is as follows:

[0040] N-Methylpyrrole→N-Alkyl-N-Methylpyrrole Halide→Pyrrole Cationic Ionic Liquid

[0041]

[0042] where RX represents haloalkane or In the inorganic salt MY containing an organic anion, the cation M + Can be Na + 、K+ and NH 4 + etc.; anion Y - Can be BF 4 - 、PF 6 - , (CF 3 SO 2 ) 2 N - 、CF 3 SO 3 - or (FSO 2 ) 2 N - Wait.

[0043] Specifically include the following steps:

[0044] Step S1: react N-methylpyrrole with methoxyethoxyhalomethane in a molar ratio of 1:1 to 1:1.2 to generate N-methoxyethoxymethyl-N-methylpyrrole halide Salt.

[0045] The details are as follows: mix N-methylpyrrole and methoxyethoxyhalomethane in a molar ratio of 1:1 to 1:1.2, under the protection of an inert gas, heat up to 60-80°C, stir and react, then cool to room temperature , washed with ethyl acetate and dried in vacuo to give N-methoxyethoxymet...

Embodiment 1

[0063] Example 1: Synthesis of N-methoxyethoxymethyl-N-methylpyrrole tetrafluoroborate

[0064] 81g, 1mol of N-methylpyrrole and 136.4g, 1.1mol of methoxyethoxymethane chloride were respectively added into a 250mL flask, and the temperature was raised to 60°C under a nitrogen atmosphere, and the reaction was stirred for 72 hours. Let stand to cool, and wash three times with ethyl acetate. Vacuum drying at 80° C. gave a pale yellow solid, namely N-methoxyethoxymethyl-N-methylpyrrole chloride, with a yield of 83%.

[0065] Add 102.5g, 0.5mol of N-methoxyethoxymethyl-N-methylpyrrole chloride, 55g, 0.5mol of NaBF to a 500mL flask 4 and 100 mL of deionized water, stirred at room temperature for 8 hours. After the reaction was completed, the mixture was extracted three times with 250 mL of dichloromethane, and the extracts were combined. Then back-extracted with 60 mL deionized water each time until saturated with AgNO 3 The aqueous solution was titrated until no precipitation o...

Embodiment 2

[0067] Example 2: Synthesis of N-methoxyethoxymethyl-N-methylpyrrole hexafluorophosphate

[0068] 81g, 1mol of N-methylpyrrole and 184.8g, 1.1mol of methoxyethoxymethyl bromide were respectively added into a 250mL flask. Under an argon atmosphere, the temperature was raised to 80°C, and the reaction was stirred for 48 hours. Let stand to cool, and wash three times with ethyl acetate. Vacuum drying at 80° C. gave a pale yellow solid, N-methoxyethoxymethyl-N-methylpyrrole bromide, with a yield of 86%.

[0069] Add 0.5mol N-methoxyethoxymethyl-N-methylpyrrole bromide, 92g, 0.5mol KPF to a 500mL flask 6 and 125 mL of deionized water, stirred at room temperature for 16 hours. After the reaction was completed, the mixture was extracted three times with 250 mL of dichloromethane, and the extracts were combined. Then back-extracted with 60 mL deionized water each time until saturated with AgNO 3 The aqueous solution was titrated until no precipitation occurred in the aqueous phase...

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Abstract

The invention relates to a pyrrole ionic liquid of which the chemical structural formula is disclosed in the specification, wherein Y- is BF4-, PF6-, (CF3SO2)2N-, (FSO2)2N- or CF3SO3-. The pyrrole ionic liquid is completely composed of ions at room temperature or approximate room temperature, has the advantages of high electric conductivity, low melting point, wide electrochemical window, heat stability and no toxicity, and is non-volatile and non-flammable; and the pyrrole ionic liquid has especially high decomposition voltage, can not be easily decomposed under high-voltage conditions, and thus, can be applied to the field of manufacturing of high-specific-capacity supercapacitors or lithium ion batteries. In addition, the invention also relates to a preparation method and application of the pyrrole ionic liquid.

Description

【Technical field】 [0001] The invention relates to the field of capacitor electrolyte, in particular to a pyrrole-based ionic liquid and a preparation method thereof, and also relates to an electrolyte using the pyrrole-based ionic liquid, a preparation method thereof, and a supercapacitor. 【Background technique】 [0002] Supercapacitor is a new type of energy device between rechargeable batteries and capacitors. It has the advantages of small size, large capacity, fast charging speed, long cycle life, high discharge efficiency, wide operating temperature range, good reliability, pollution-free and maintenance-free It is a new type, efficient and practical energy storage device, so it is widely used in military fields, mobile communication devices, computers, and hybrid power sources for electric vehicles. The energy stored in a supercapacitor is proportional to the square of the applied voltage, therefore, increasing the applied voltage can greatly increase the specific ener...

Claims

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Application Information

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IPC IPC(8): C07D295/088C07C303/32C07C303/40C07C309/06C07C311/48H01G9/035
CPCH01G11/62Y02E60/13
Inventor 周明杰刘大喜王要兵
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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