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Pyrrolidine ionic liquid, and preparation method, electrolyte and capacitor thereof

A technology of ionic liquid and pyrrolidine, which is applied in the field of pyrrolidine ionic liquid and its preparation, can solve the problems of stability, safety and electrochemical performance to be improved, and achieve the effect of improving excellent electrochemical performance, stability and safety performance

Inactive Publication Date: 2014-08-06
OCEANS KING LIGHTING SCI&TECH CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its stability, safety and electrochemical performance when applied to capacitors need to be improved.

Method used

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  • Pyrrolidine ionic liquid, and preparation method, electrolyte and capacitor thereof
  • Pyrrolidine ionic liquid, and preparation method, electrolyte and capacitor thereof
  • Pyrrolidine ionic liquid, and preparation method, electrolyte and capacitor thereof

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preparation example Construction

[0035] The preparation process of the pyrrolidine ionic liquid electrolyte of the present invention can be roughly divided into the following three steps:

[0036] Methyl pyrrolidine→alkylpyrrolidine halide→pyrrolidine ionic liquid→pyrrolidine ionic liquid electrolyte

[0037] The first step is to prepare alkylpyrrolidine halides through the reaction of methylpyrrolidine and haloalkane RX;

[0038] The reaction formula is as follows:

[0039]

[0040] Among them, X is a halogen, preferably chlorine, bromine or iodine atom; R is a methoxyalkyl group with the following general formula (II): CH 3 O(CH 2 ) n (II), wherein n is 2, 3 or 4;

[0041] The haloalkane RX here is more precisely a methoxy haloalkane, and the oxygen in the chemical formula is connected to the carbon in the form of an ether bond.

[0042] The second step is to prepare pyrrolidine ionic liquid through ion exchange carried out by inorganic salt MY and alkylpyrrolidine halide;

[0043] The reaction for...

Embodiment 1

[0061] The pyrrolidine ionic liquid provided in Example 1 is specifically: N-methoxyethyl-N-methylpyrrolidine tetrafluoroborate liquid ionic liquid, and its structural formula is:

[0062]

[0063] The preparation method of above-mentioned ionic liquid, comprises the following steps:

[0064] (a) Preparation of alkylpyrrolidine halides

[0065] Add 85g (1mol) of methylpyrrolidine and 104.0g (1.1mol) of methoxychloroethane into a 250ml flask respectively. in N 2 Under the protection of the atmosphere, the temperature was raised to 70° C., and the reaction was stirred for 40 h. Let stand to cool, and wash three times with ethyl acetate. Vacuum drying at 80° C. for 24 h gave a light yellow solid as N-methoxyethyl-N-methylpyrrolidine chloride salt with a yield of 80%.

[0066] (b) Preparation of pyrrolidine ionic liquid

[0067] Add 94.8g (0.5mol) N-methoxyethyl-N-methylpyrrolidine chloride salt, 57.8g (0.53mol) NaBF in 250ml flask 4 and 130ml of deionized water (that is,...

Embodiment 2

[0071] The pyrrolidine ionic liquid provided in Example 2 is specifically: N-methoxypropyl-N-methylpyrrolidine hexafluorophosphate ionic liquid, and its structural formula is:

[0072]

[0073] The preparation method of above-mentioned ionic liquid, comprises the following steps:

[0074] (a) Preparation of alkylpyrrolidine halides

[0075] Add 85g (1mol) of methylpyrrolidine and 160.7g (1.05mol) of methoxybromopropane into a 250ml flask respectively. in Ar 2 Under the protection of atmosphere, the temperature was raised to 60° C., and the reaction was stirred for 60 h. Let stand to cool, and wash three times with ethyl acetate. Vacuum drying at 80°C for 36 h gave N-methoxypropyl-N-methylpyrrolidine bromide as a light yellow solid with a yield of 81%.

[0076] (b) Preparation of pyrrolidine ionic liquid

[0077] In the 250ml flask, add 124.1g (0.5mol) N-methoxypropyl-N-methylpyrrolidine bromide, 92g (0.5mol) KPF 6 and 100ml of deionized water (that is, the molar volum...

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Abstract

The invention relates to a pyrrolidine ionic liquid and a preparation method thereof. The preparation method comprises: 1, preparing alkyl pyrrolidine halide; and 2, preparing the pyrrolidine ionic liquid. The pyrrolidine ionic liquid has a general formula (IV); in the formula (IV), Y<-> is tetrafluoroborate anion, hexafluorophosphate anion, trifluoromethylsulfonylimide anion or trifluoromethylsulfonic acid anion; and R is methoxy alkyl group represented by formula (III) of CH3O(CH2)n, and n is 2, 3 or 4. The invention also relates to an ionic liquid electrolyte prepared by using the pyrrolidine ionic liquid and, and an application of the ionic liquid electrolyte in a capacitor. The pyrrolidine ionic liquid electrolyte has substantially better stability and safety than present commercial electrolytes due to the addition of a large amount of the ionic liquid, and super capacitors using the pyrrolidine ionic liquid electrolyte have excellent electrochemical performances.

Description

technical field [0001] The invention relates to the field of capacitor electrolytes, in particular to a pyrrolidine ionic liquid and a preparation method thereof. The invention also relates to an electrolyte prepared from the pyrrolidine ionic liquid and its application in capacitors. Background technique [0002] Ionic liquids (Ionic liquids) are liquid at room temperature (generally below 100°C), and are composed of organic cations and inorganic anions (or organic anions). Ionic liquids are adjustable, and their anion and cation structures can be changed according to different needs, so as to achieve the designer's purpose, so ionic liquids are called the designer's solvent. [0003] The first ionic liquid, nitroethylamine, was discovered as early as 1914, but the research progress in this field has been slow since then. Until 1992, the research group led by Wikes synthesized 1-ethyl-3-methylimidazolium tetrafluoroborate ionic liquid ([EMIM]BF 4 ), the research on ionic...

Claims

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Application Information

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IPC IPC(8): C07D295/088C07C311/48C07C303/40C07C309/06C07C303/32H01G11/62
CPCY02E60/13C07D295/088H01G11/62
Inventor 周明杰刘大喜王要兵钟玲珑
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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