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A kind of ionic supramolecular binder, preparation method and application

A binder and supramolecular technology, which is applied in the field of lithium ion battery preparation, can solve the problems of not being able to apply positive and negative electrode materials at the same time, limited cycle performance improvement of positive and negative electrode materials, and poor conductivity, etc., so as to improve electrochemical performance, Overcome the effect of active material separation and high electrical conductivity

Active Publication Date: 2022-03-08
SHENZHEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A kind of ionic supramolecular binder, preparation method and application
  • A kind of ionic supramolecular binder, preparation method and application
  • A kind of 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 in particular relates to an ionic supramolecular binder, a preparation method and an application. The molecular structure of the binder provided by the present invention contains ionic liquid units, pyridine structural units and acrylic structural units. The present invention introduces an ionic liquid structure into the binder for the first time, so that the same structural unit contains both cations and freely movable Anions are beneficial to improve the conductivity of supramolecules, and the introduction of acrylic acid structural units is beneficial to improve the interaction between the binder and the electrode material and the current collector, thereby improving the bonding strength and maintaining the stability and integrity of the electrode, thereby improving the electrical conductivity. chemical properties.

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 Patents(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