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Ionic supramolecular binder, preparation method and application

A binder and supramolecular technology, applied in the field of lithium-ion battery preparation, can solve the problems of limited improvement of positive and negative electrode material cycle performance, inability to apply positive and negative electrode materials at the same time, poor conductivity, etc., to improve electrochemical performance, Overcome the effect of active material separation and high electrical conductivity

Active Publication Date: 2021-08-17
SHENZHEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Therefore, the technical problem to be solved in the present invention is to overcome the poor conductivity of the binder used for lithium ion electrode materials in the prior art, which cannot be applied to positive and negative electrode materials at the same time, and has limited improvement in the cycle performance of positive and negative electrode materials. , thereby providing an ionic supramolecular binder, preparation method and application

Method used

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  • Ionic supramolecular binder, preparation method and application
  • Ionic supramolecular binder, preparation method and application
  • Ionic supramolecular binder, preparation method and application

Examples

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Embodiment 1

[0052] The present embodiment provides a kind of ionic supramolecular binder, and its preparation method is:

[0053] First, add 0.1mol 1-vinyl-3-ethylimidazole hexafluorophosphate, 0.1mol vinylpyridine butyrate (pyridinecarboxylate betaine) and 0.5mol acrylic acid to 44g DMF solvent, then add 1-hydroxy Cyclohexyl phenyl ketone (184) 0.4g, fully stirred for 1 hour at a stirring speed of 200 rpm, placed under a UV lamp at a temperature of 70°C, polymerized for 1 hour, and then fully reacted to obtain an ion with a solid content of 65%. supramolecular binders.

Embodiment 2

[0055] The present embodiment provides a kind of ionic supramolecular binder, and its preparation method is:

[0056] First, add 0.1mol 1-vinyl-3-ethylimidazolium hexafluorophosphate, 0.1mol pyridinecarboxylate betaine and 0.4mol methacrylic acid into 80g DMF solvent, then add photoinitiator 1173 0.4g, stir well 0.2h, the stirring speed is 500 rev / min, placed under a UV lamp at a temperature of 50°C, and polymerized for 5h, after fully reacting, an ionic supramolecular binder with a solid content of 50% is obtained.

Embodiment 3

[0058] The present embodiment provides a kind of ionic supramolecular binder, and its preparation method is:

[0059] First, add 0.3mol 1-vinyl-3-ethylimidazolium bromide, 0.2mol pyridinecarboxybetaine and 0.1mol acrylic acid into 425g of DMF solvent, then add 1.6g of photoinitiator 184, stir well for 0.5h, Stirring speed is 300 rev / min, placed under UV light at 25°C, polymerized for 12 hours, after full reaction, an ionic supramolecular binder with a solid content of 20% is obtained.

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Abstract

The invention belongs to the technical field of lithium ion battery preparation, and particularly relates to an ionic supramolecular binder, a preparation method and application. The molecular structure of the binder provided by the invention contains an ionic liquid unit, a pyridine structural unit and an acrylic acid structural unit, and the ionic liquid structure is introduced into the adhesive for the first time, so that the same structural unit simultaneously contains cations and anions capable of freely moving, thereby being beneficial to improving the conductivity of supramolecules; and the acrylic acid structural unit is introduced, so that the interaction among the binder, an electrode material and a current collector is improved, the bonding strength is further improved, the stability and completeness of an electrode are maintained, and the electrochemical performance is improved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery preparation, and in particular relates to an ionic supramolecular binder, a preparation method and an application. Background technique [0002] Lithium-ion batteries are widely used in aerospace, tablet computers and electric vehicles due to their high capacity, long cycle life, high energy density, environmental protection, wide temperature range and safety. However, the practical application of lithium-ion batteries as power batteries in electric vehicles still has problems such as safety, high-rate charge-discharge performance, and cycle life. [0003] Binder is an important part of the positive and negative electrodes of lithium-ion batteries, which has an important impact on the performance of the battery. The binder has poor electrical conductivity due to its polymer structure, so if it is added in a large amount, the resistance will be large, which will affect the electrochemi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/13H01M10/0525C08F220/06C08F226/06
CPCH01M4/622H01M4/13H01M10/0525C08F220/06C08F226/06Y02E60/10
Inventor 陈少军黄书卓海涛
Owner SHENZHEN UNIV