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Imidazole ionic liquid, ionic liquid electrolyte as well as preparation method and application thereof

A technology of ionic liquids and imidazoles, which is applied in the electrolyte of high-voltage lithium-ion batteries. In the field of imidazoles ionic liquids, it can solve the problems of deteriorating battery performance and increasing interface impedance, achieving good safety, improving cycle performance, and wide range. The effect of the electrochemical window

Inactive Publication Date: 2018-09-14
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the battery voltage reaches 4.5V (vs.Li / Li + ) or so, the electrolyte begins to undergo a violent oxidation and decomposition reaction, resulting in an increase in the interface impedance between the electrode / electrolyte, thereby deteriorating the performance of the battery

Method used

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  • Imidazole ionic liquid, ionic liquid electrolyte as well as preparation method and application thereof
  • Imidazole ionic liquid, ionic liquid electrolyte as well as preparation method and application thereof
  • Imidazole ionic liquid, ionic liquid electrolyte as well as preparation method and application thereof

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preparation example Construction

[0057] In addition, this embodiment also provides a method for preparing an imidazole-based ionic liquid, comprising the following steps:

[0058] Step S110, according to the molar ratio of 2-methylimidazole and chloroalkyl ether in the ratio of 1:1 to 1:1.1, react 2-methylimidazole and chloroalkyl ether at 100-150°C for 24~ After washing, add triethylamine in an equimolar amount to 2-methylimidazole, and react at 100-130°C for 16-24 hours to obtain 1-alkoxyalkyl-2-methylimidazole with the following structural formula:

[0059]

[0060] Among them, R 1 for CH 2 (CH 2 ) a O(CH 2 ) b CH 3 , a is 0 or 1, and b is 0 or 1.

[0061] The obtained product containing 1-alkoxyalkyl-2-methylimidazole was washed 2 to 3 times with absolute ethanol, then subjected to vacuum distillation and collected fractions to obtain purified 1-alkoxyalkyl-2 - Methylimidazole.

[0062] In other preferred embodiments, the molar ratio of 2-methylimidazole to chloroalkyl ether is 1:1.05.

[006...

Embodiment 1

[0087] Get 0.5mol 2-methylimidazole, 0.525mol 2-chloroethyl methyl ether (structural formula is ) and 80ml of absolute ethanol, mixed and dissolved, and transferred into a 250ml hydrothermal kettle to react for 48h at 140°C; then use 100ml of absolute ethanol and anhydrous ether (1:4, v / v) mixed solvent to dissolve the reaction generated The brown oil was washed three times, then mixed with 0.5mol triethylamine and transferred into a 250ml hydrothermal kettle to react at 130°C for 16h; the white salt impurities generated by the reaction were removed by suction filtration, the filtrate was collected, and the filtrate was distilled under reduced pressure , Collect the fraction ie 1-methoxyethyl-2-methylimidazole. The yield was 82%.

[0088] Add 0.35mol 1-methoxyethyl-2-methylimidazole and 0.385mol chloropropene to a 100ml flask respectively to obtain a mixture; under the protection of nitrogen atmosphere, stir the above mixture at 60°C for 8h to obtain the reaction Product; w...

Embodiment 2

[0094] Take 0.5mol 2-methylimidazole, 0.525mol 2-chloroethyl ethyl ether and 80ml of absolute ethanol, mix and dissolve, transfer to a 250ml hydrothermal kettle and react at 140°C for 54h; then use 100ml of absolute ethanol and absolute Diethyl ether (1:4, v / v) mixed solvent to wash the brown oil produced by the reaction three times, then mix it with 0.5mol triethylamine and transfer it into a 250ml hydrothermal kettle to react at 130°C for 20h; remove the reaction product by suction filtration white salt impurities, the filtrate was collected, and the filtrate was distilled under reduced pressure, and the collected fraction was 1-ethoxyethyl-2-methylimidazole. The yield was 81%.

[0095] Add 0.35mol 1-ethoxyethyl-2-methylimidazole and 0.385mol vinyl chloride to a 100ml flask respectively to obtain a mixture; under the protection of nitrogen atmosphere, stir the above mixture at 60°C for 10h to obtain the reaction The product; washed three times with ether, and the reaction p...

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Abstract

The invention provides imidazole ionic liquid. The structural formula of the ionic liquid is as follows: a formula is as shown in the description, wherein R1 is CH2(CH2)aO(CH2)bCH3; a is 0 or 1; b is0 or 1; R2 is CnH2n-1; n is 2 or 3; Y- is selected from one of BF4<->, PF6<->, TFSI<-> or (FSO2)2N<->. The imidazole ionic liquid is subjected to triple substitution; meanwhile, different types of electron contributing groups are introduced into the imidazole ionic liquid, so that a saturated ether group structure and an unsaturated alkenyl structure are arranged at a site N-1 and a site N-3 of the imidazole ring; the ether group is introduced by selecting suitable parameters in the preparation process; when the ionic liquid is used as lithium-ion battery electrolyte, the electrochemical window of the electrolyte can be improved; when the ionic liquid is applied to high-voltage lithium-ion batteries taking LiNi0.5Mn1.5O4 as positive electrode materials, the safety and the electrochemical performance of the lithium-ion batteries can be improved. (The formula is shown in the description.).

Description

technical field [0001] The invention relates to the technical field of ionic liquids, in particular to imidazole ionic liquids, ionic liquid electrolytes and their application in high-voltage lithium-ion battery electrolytes. Background technique [0002] Ionic liquids are salts composed of anions and cations that are liquid at room temperature (generally below 100°C), and are also called room temperature molten salts. Generally composed of organic cations and inorganic anions, it is a new type of "soft" functional material or medium. Different combinations of cations and anions can be changed to design different ionic liquids. An ionic liquid of ethylamine nitrate was reported in 1914, but its explosive properties were quickly forgotten. In the 1990s, dialkylimidazole-based ionic liquids were produced. This type of ionic liquid has good stability and has become the most intensively studied type of ionic liquid that is still being studied until now. Since 2000, researchers...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D233/60H01M10/0566
CPCC07D233/60H01M10/0566Y02E60/10
Inventor 张文林赵勇琪霍宇兰晓燕史紫微孙腾飞李功伟李春利
Owner HEBEI UNIV OF TECH
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