High-capacity imidazole ionic liquid as well as preparation method and application thereof

A technology of imidazole ionic liquid and ionic liquid, which is applied in the application field of new imidazole ionic liquid and lithium-ion battery electrolyte, and can solve the problems that pure ionic liquid electrolyte cannot achieve electrochemical effect, poor cycle stability, and poor rate performance. , to achieve good cycle performance and electrochemical stability, high stability, and wide electrochemical window

Pending Publication Date: 2020-06-05
HEBEI UNIV OF TECH
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  • Description
  • Claims
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Problems solved by technology

However, electrolytes using ionic liquids alone have poor cycle stability and poor rate performance with

Method used

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  • High-capacity imidazole ionic liquid as well as preparation method and application thereof
  • High-capacity imidazole ionic liquid as well as preparation method and application thereof
  • High-capacity imidazole ionic liquid as well as preparation method and application thereof

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preparation example Construction

[0056] In addition, this embodiment also provides a preparation method of imidazolium ionic liquid, comprising the following steps:

[0057] In step S110, according to the molar ratio of 2-methylimidazole and brominated alkyl ether being 1:1 to 1:1.1, 2-methylimidazole and brominated alkyl ether are dissolved in a solvent at 100 to 150 Reaction at ℃ for 24-48 hours; after the reaction, extract with a mixed solution of absolute ethanol and absolute ether for 2-3 times, and then add triethylamine in an equimolar amount to 2-methylimidazole in the organic phase, at 100-130 Reaction at ℃ for 16 to 24 hours to obtain 1-alkoxyalkyl-2-methylimidazole of the following structural formula:

[0058]

[0059] Among them, R 1 for CH 2 (CH 2 ) a O(CH 2 ) b CH 3 , a is 0 or 1, b is 0 or 1;

[0060] The obtained product contains 1-alkoxyalkyl-2-methylimidazole, and the white salt impurities generated by the reaction are removed by suction filtration, the filtrate is collected, and...

Embodiment 1

[0085] Take 0.1mol 2-methylimidazole, 0.105mol 2-bromoethyl methyl ether and 20mL of absolute ethanol, mix and dissolve, transfer to a 250ml reaction kettle, and react at 140°C for 48 hours; then use 10ml of absolute ethanol and The mixed solution of anhydrous ether (1:4, v / v) extracted the brown solution generated by the reaction three times, kept the organic phase solution, then mixed with 0.1mol triethylamine and transferred to a 250mL reactor, and reacted at 130°C for 16 hours; remove the white salts of the reaction product by suction filtration, collect the filtrate and carry out vacuum distillation, and collect the fractions to obtain 1-methoxyethyl-2-methylimidazole.

[0086]

[0087] Among them, R 1 for CH 2 (CH 2 ) a O(CH 2 ) b CH 3 , a is 1, b is 0;

[0088] Under nitrogen protection gas atmosphere, dissolve 0.083mol 1-methoxyethyl-2-methylimidazole in 15mL dichloromethane, then mix and dissolve with 0.087mol methyl chloroacetate, and then put the above mi...

Embodiment 2

[0104] Take 0.1mol 2-methylimidazole, 0.105mol 2-bromoethyl ethyl ether and 20mL of absolute ethanol, mix and dissolve, transfer to a 250ml reaction kettle, and react at 140°C for 48 hours; then use 10ml of absolute ethanol and anhydrous A mixed solution of water and ether (1:4, v / v) washed the brown solution generated by the reaction three times, then mixed with 0.1mol triethylamine and transferred to a 250mL reactor, and reacted at 130°C for 16 hours; the reaction solution was removed by suction filtration. The product is a white salt substance, the filtrate is collected and distilled under reduced pressure, and the fraction is collected to obtain 1-ethoxyethyl-2-methylimidazole.

[0105] Under nitrogen protection gas atmosphere, dissolve 0.083mol 1-ethoxyethyl-2-methylimidazole in 15mL dichloromethane, then mix and dissolve with 0.087mol methyl chloroacetate, then react the above mixture at 60°C After 48 hours, the reaction product was obtained; the product was distilled un...

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Abstract

The invention relates to high-capacity imidazole ionic liquid as well as a preparation method and an application thereof. The structural formula of the ionic liquid is shown in the specification, in the formula, R1 is CH2(CH2)aO(CH2)bCH3, a is 0 or 1, and b is 0 or 1; R2 is CH2(CH2)cCOO(CH2)dCH3, c is 0 or 1, and d is 0 or 1; Y<-> is BF4<->, PF6<->, TFSI<->, FSI<-> or N(CN) 2<->. In the preparation of the imidazole ionic liquid, through ternary substitution, ether groups are introduced to the N-1 site of an imidazole ring, so that the viscosity of the ionic liquid is reduced; an ester group isintroduced to the N-3 site of the imidazole ring, so that the electrochemical window and the electrochemical stability of the ionic liquid are improved. The imidazole ionic liquid is used as an electrolyte additive, is applied to a lithium ion battery taking a ternary material (NCM523) as a positive electrode material, and has good safety performance and electrochemical performance.

Description

technical field [0001] The invention relates to the technical field of ionic liquids, and mainly studies novel imidazole ionic liquids, ionic liquid electrolytes and their application in lithium-ion battery electrolytes. Background technique [0002] Since 2012, the smoggy weather has continued, and the PM2.5 index has been condescending. Environmental pollution has been widely discussed and concerned by public opinion from all walks of life. Air pollution has had a serious impact on people's life and travel, and it has once again sounded the alarm on China's environmental problems. The current unreasonable energy structure in China and a large number of urban motor vehicle exhaust emissions are the main culprits. Automobiles emit more than 90% of PM and more than 70% of CO. In order to avoid excessive deterioration of the environment, new energy vehicles are gradually developed. However, as far as the current development trend of my country's new energy vehicles is concer...

Claims

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Application Information

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IPC IPC(8): C07D233/60H01M10/0567H01M10/0525
CPCC07D233/60H01M10/0567H01M10/0525H01M2300/0025Y02E60/10
Inventor 张文林刘雪娇马青查张永康杨双丞李春利
Owner HEBEI UNIV OF TECH
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