A kind of novel ionic liquid and preparation method thereof

A technology for ionic liquids and lithium-ion batteries, applied in the chemical industry, can solve problems such as poor solubility of lithium salts and hinder the application of ionic liquids, and achieve excellent wettability of polyimide, good solubility of lithium salts, and high thermal stability Effect

Inactive Publication Date: 2017-09-29
SHANGHAI APPLIED TECHNOLOGIES COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the above-mentioned technical problems in the prior art, the present invention provides a novel ionic liquid and a preparation method thereof. The novel ionic liquid and the preparation method thereof solve the problem of dissolving the lithium salt by the ionic liquid in the prior art. Poor performance, technical problems hindering the application of ionic liquids in lithium-ion batteries

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  • A kind of novel ionic liquid and preparation method thereof
  • A kind of novel ionic liquid and preparation method thereof
  • A kind of novel ionic liquid and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Add 0.001 mol redistilled PEG (average molecular weight 200) into the three-necked flask. Then, take 50mL of thionyl chloride and place it in a constant pressure dropping funnel. Subsequently, thionyl chloride was added dropwise into polyethylene glycol at 20°C. After the dropwise addition of thionyl chloride was completed, the reaction was maintained for 12 hours. Next, vacuum distillation was carried out to remove the remaining thionyl chloride. The obtained light yellow liquid was put into a vacuum drying oven and dried at 40° C. for 12 h. Finally, the resulting product is stored in a vacuum desiccator for future use.

[0030]Under nitrogen protection, 0.001 mol of chlorinated PEG (the average molecular weight of PEG is 200) was added into the three-necked flask. The temperature was raised to 60 °C, and then 0.5 mL of redistilled 1-methylimidazole was slowly added with stirring. After 24 h of reaction, the reaction was stopped and the temperature was lowered to ...

Embodiment 2

[0034] Add 0.01 mol of redistilled PEG (average molecular weight: 300) into the three-necked flask. Then, take 60 mL of thionyl chloride and place it in a constant pressure dropping funnel. Subsequently, thionyl chloride was added dropwise into polyethylene glycol at 40°C. After the dropwise addition of thionyl chloride was completed, the reaction was maintained at 80°C for 8h. Next, vacuum distillation was carried out to remove the remaining thionyl chloride. The obtained light yellow liquid was put into a vacuum drying oven and dried at 50° C. for 12 h. Finally, the resulting product is stored in a vacuum desiccator for future use.

[0035] Under the protection of nitrogen, 0.01 mol of chlorinated PEG (the average molecular weight of PEG is 300) was added into the three-necked flask. The temperature was raised to 80 °C, and then 1.2 mL of redistilled 1-methylimidazole was slowly added with stirring. After 20 h of reaction, the reaction was stopped and the temperature wa...

Embodiment 3

[0039] Add 0.01 mol redistilled PEG (average molecular weight 400) into the three-neck flask. Then, take 60 mL of thionyl chloride and place it in a constant pressure dropping funnel. Subsequently, thionyl chloride was added dropwise into polyethylene glycol at 40°C. After the dropwise addition of thionyl chloride was completed, the reaction was maintained at 80°C for 8h. Then, vacuum distillation was carried out to remove the remaining thionyl chloride. The obtained light yellow liquid was put into a vacuum drying oven and dried at 50° C. for 12 h. Finally, the resulting product is stored in a vacuum desiccator for future use.

[0040] Under the protection of nitrogen, 0.01 mol of chlorinated PEG (the average molecular weight of PEG is 400) was added into the three-necked flask. The temperature was raised to 80 °C, and then 1.2 mL of redistilled 1-methylimidazole was slowly added with stirring. After 20 h of reaction, the reaction was stopped and the temperature was lowe...

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Abstract

The invention discloses a novel ionic liquid. A structural formula of the novel ionic liquid is as shown in the specification. The invention further provides a preparation method of the novel ionic liquid. The method comprises the following steps: reacting polyethylene glycol with thionyl chloride to obtain chlorinated polyethylene glycol; heating the chlorinated polyethylene glycol under nitrogen protection; adding 1-methylimidazole, washing, drying, purifying and discoloring the chlorinated polyethylene glycol after the reaction is ended, so as to obtain a chlorinated bis-imidazole ionic liquid; and dissolving the chlorinated bis-imidazole ionic liquid into deionized water, adding a saline solution containing required anions, stirring and standing the deionized water, separating out lower oily matters, and washing and drying the solution to obtain the novel ionic liquid. The novel ionic liquid obtained by the method disclosed by the invention has the advantages of relatively high conductivity, high heat stability, relatively wide electrochemical stability window and good solubility to a lithium salt, and can be used as a lithium-ion battery electrolyte.

Description

technical field [0001] The invention belongs to the field of chemical industry, and relates to a lithium-ion battery electrolyte, in particular to a novel ionic liquid and a preparation method thereof. Background technique [0002] Due to the advantages of high specific energy, long cycle life, high single-cell voltage, low self-discharge rate, wide operating temperature range, and environmental friendliness, pure electric vehicles powered by lithium-ion batteries have become a new energy vehicle field. important direction of development. However, pure electric vehicles currently using lithium-ion batteries as power sources are still at the level of concept cars and cannot be popularized and applied on a large scale. The main reason is that the safety of batteries does not meet the requirements for actual use. There are many factors that affect the safety performance of lithium-ion batteries. Research results in recent years have shown that separators and liquid electrolyte...

Claims

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Application Information

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IPC IPC(8): H01M10/0565C07D233/60C08G65/48
CPCC07D233/60C08G65/48H01M10/0565Y02E60/10
Inventor 康诗钊杨会杰李向清秦利霞穆劲
Owner SHANGHAI APPLIED TECHNOLOGIES COLLEGE
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