A kind of preparation method of semi-solid polyionic liquid electrolyte for lithium battery

A technology of polyionic liquids and electrolytes, which is applied in the field of electrolytes, can solve problems such as easy leakage of electrolytes, achieve the effects of improving safety, reducing packaging requirements, and improving performance

Active Publication Date: 2022-08-02
宁波世贤科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the ionic liquid electrolyte is still a liquid at room temperature, and it is easy to leak as an electrolyte.

Method used

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  • A kind of preparation method of semi-solid polyionic liquid electrolyte for lithium battery
  • A kind of preparation method of semi-solid polyionic liquid electrolyte for lithium battery
  • A kind of preparation method of semi-solid polyionic liquid electrolyte for lithium battery

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Effect test

Embodiment 1

[0059] A preparation method of semi-solid polyionic liquid electrolyte for lithium battery. Specific steps are as follows:

[0060] 1. Ionic liquid monomer prepared by chemical synthesis method: vinylimidazole reacts with n-butane bromide in an oil bath at 50°C to generate 1-butyl-3-vinylimidazolium bromide (intermediate 1), which is at room temperature It is a viscous solid, and its reaction structure is as follows figure 1 shown;

[0061] 2. After reacting equimolar intermediate 1 with sodium hexafluorophosphate (NaPF6) in an aqueous solution for 8 hours, the lower layer was taken out, purified, and the yield was 90% to obtain a liquid 1-butyl-3- Vinylimidazole hexafluorophosphoric acid (ionic liquid monomer 1), its structural formula is as figure 2 shown (Y - For: PF6 - );

[0062] 3. Mix the ionic liquid monomer 1 with lithium hexafluorophosphate to form an electrolyte (electrolyte monomer 1) with a concentration of 1M lithium hexafluorophosphate;

[0063] 4. Add 1...

Embodiment 2

[0067] A preparation method of semi-solid polyionic liquid electrolyte for lithium battery. Specific steps are as follows:

[0068] 1. Ionic liquid monomer prepared by chemical synthesis method: vinylimidazole reacts with n-butane bromide in an oil bath at 50°C to generate 1-butyl-3-vinylimidazolium bromide (intermediate 1), which is at room temperature It is a viscous solid, and its reaction structure is as follows figure 1 shown;

[0069] 2. After an equimolar amount of intermediate 1 was reacted with lithium bisfluorosulfonimide (LiFSI) in an aqueous solution for 8 hours, the lower layer was taken out, purified, and the yield was 85% to obtain a liquid 1-butyl at room temperature -3-vinylimidazole bisfluorosulfonimide (ionic liquid monomer 2), its structural formula is as follows figure 2 Shown (Y- is: FSI - );

[0070] 3. Mix the ionic liquid monomer 2 with lithium bisfluorosulfonimide to form an electrolyte (electrolyte monomer 2) with a concentration of 1M lithium ...

Embodiment 3

[0075] A preparation method of semi-solid polyionic liquid electrolyte for lithium battery. Specific steps are as follows:

[0076] 1. Ionic liquid monomer prepared by chemical synthesis method: vinylimidazole reacts with n-butane bromide in an oil bath at 50°C to generate 1-butyl-3-vinylimidazolium bromide (intermediate 1), which is at room temperature It is a viscous solid, and its reaction structure is as follows figure 1 shown;

[0077] 2. After an equimolar amount of intermediate 1 was reacted with lithium bistrifluoromethanesulfonimide (LiTFSI) in an aqueous solution for 4 hours, the subnatant was taken out, purified, and the yield was 90% to obtain 1 that was a liquid at room temperature. -Butyl-3-vinylimidazole bis-trifluoromethylsulfonimide ionic liquid (ionic liquid monomer 3), its structural formula is as follows figure 2 Shown (Y- is: TFSI - );

[0078] 3. Mix the ionic liquid monomer 3 with lithium bis-trifluoromethylsulfonimide to form an electrolyte (elect...

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Abstract

The invention relates to a preparation method of a semi-solid polyionic liquid electrolyte for lithium batteries. The traditional organic electrolyte containing lithium hexafluorophosphate is replaced with a gel-like polyionic liquid electrolyte. Specifically, based on the ionic liquid as a matrix, it is polymerized at a higher temperature using an initiator, thereby forming a colloidal non-flowable electrolyte. Therefore, while having high safety, it solves the problem of easy leakage of the electrolyte, and greatly reduces the packaging requirements of the battery.

Description

technical field [0001] The invention belongs to the field of electrolytes and relates to a lithium battery electrolyte, in particular to a semi-solid polyionic liquid electrolyte for lithium batteries and a preparation method thereof. Background technique [0002] The current energy supply mainly relies on non-renewable fossil energy. With the over-exploitation and utilization of fossil energy such as coal, the ecological environment on which human beings depends is deteriorating day by day. The development of high-performance energy storage devices presents an urgent requirement. As a new generation of energy storage and conversion devices, lithium-ion batteries have the advantages of high energy density, long cycle life, high discharge voltage, no memory effect, low self-discharge rate and low environmental pollution. They are widely used in portable electronic equipment, static energy storage, etc. systems and electric / hybrid vehicles. However, the quality indicators of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F126/06H01M10/0565H01M10/052H01M10/0525
CPCC08F126/06H01M10/0565H01M10/052H01M10/0525H01M2300/0085Y02E60/10
Inventor 陈正飞高瑞芹武玉学
Owner 宁波世贤科技有限公司
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