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Preparation method of positive electrode composite conductive binding agent for lithium ion battery

A lithium-ion battery and composite conductive technology, which is applied to battery electrodes, circuits, electrical components, etc., can solve the problems of reduced electrode cycle life, poor chemical stability of conductive adhesives, and large attenuation, and achieve improved adhesion and mechanical properties And the effect of good electrochemical stability and reducing the degree of polarization

Active Publication Date: 2019-05-14
SHANDONG HUAXIA SHENZHOU NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the chemical stability of the conductive binder is poor, which leads to a large attenuation in the charge and discharge process and reduces the cycle life of the electrode.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The preparation method of positive electrode composite conductive binder for lithium ion battery described in embodiment 1 may further comprise the steps:

[0038] (1) Weigh 10 g of multi-walled carbon nanotubes in 200 g of mixed acid (a mixture of concentrated sulfuric acid and concentrated nitric acid, with a volume ratio of 3:1) and ultrasonically disperse it for 1 h, then add it to a three-necked flask, and place it in a constant temperature cooling bath at 70 ° C. Cool and reflux for 8 hours to obtain carboxylated carbon nanotubes, then wash the carboxylated carbon nanotubes to neutrality, dry them for later use, and measure the prepared carboxylated carbon nanotubes, wherein the molar fraction of carboxyl groups is 10%.

[0039] (2) Add 2g of carboxylated carbon nanotubes (MWCNTs) and 10g of polyvinylidene fluoride (PVDF) (weight-average molecular weight of 800,000, rotational viscosity of 8500mPa·s) to 200ml of HCl solution with a concentration of 1.0mol / L , form...

Embodiment 2

[0042] The preparation method of positive composite conductive binder for lithium ion battery described in embodiment 2 may further comprise the steps:

[0043](1) Weigh 7g of multi-walled carbon nanotubes in 200g of mixed acid (a mixture of concentrated sulfuric acid and concentrated nitric acid, with a volume ratio of 3:1) and ultrasonically disperse it for 1.5h, then add it to a three-necked flask, and place it in a constant temperature cooling bath at 80°C Cooling in reflux for 7 hours to obtain carboxylated carbon nanotubes, then washing the carboxylated carbon nanotubes to neutrality, drying them for later use, and measuring the prepared carboxylated carbon nanotubes, wherein the carboxyl mole fraction accounts for 7% .

[0044] (2) Add 5g of carboxylated carbon nanotubes (MWCNTs) and 10g of polyvinylidene fluoride (PVDF) (weight average molecular weight is 1 million, rotational viscosity 16000mPa·s) to 200ml of HCl solution with a concentration of 1.5mol / L , form a sta...

Embodiment 3

[0047] The preparation method of positive composite conductive binder for lithium ion battery described in embodiment 3 may further comprise the steps:

[0048] (1) Weigh 4g of single-walled carbon nanotubes in 200g of mixed acid (a mixture of concentrated sulfuric acid and concentrated nitric acid, with a volume ratio of 3:1) and ultrasonically disperse them for 2 hours, then add them to a three-necked flask, and place them in a constant temperature cooling bath at 90°C Cool and reflux for 6 hours, and finally wash the carboxylated carbon nanotubes to neutrality, dry them for later use, and measure the prepared carboxylated carbon nanotubes, wherein the molar fraction of carboxyl groups is 3%.

[0049] (2) Add 10g of carboxylated carbon nanotubes (MWCNTs) and 10g of polyvinylidene fluoride (PVDF) (weight average molecular weight is 1.2 million, rotational viscosity 21000mPa·s) to 200ml of HCl solution with a concentration of 0.8mol / L , form a stable suspension under mechanica...

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Abstract

The invention belongs to the technical field of a conductive binding agent, and particularly relates to a preparation method of a positive electrode composite conductive binding agent for a lithium ion battery. The method comprises the steps of firstly, taking polyvinylidene fluoride as a matrix, and forming a MWCNTs / PVDF composite suspension liquid from a carboxylation carbon nanotube by solutionmixing; secondly, polymerizing a conductive polymer monomer on a surface of the composite suspension liquid; and finally, performing drying and smashing to prepare a composite binding agent material.According to the preparation method of the positive electrode composite conductive binding agent for the lithium ion battery, the carboxylation carbon nanotube and the polyvinylidene fluoride are mixed, the carboxylation of the carbon nanotube accounts for 3-10%, carboxyl can be introduced on the premise that a network structure of the carbon nanotube is not damaged and favorable mechanical property is maintained, and the adhesion performance of the composite conductive binding agent is improved.

Description

technical field [0001] The invention belongs to the technical field of conductive binders, and in particular relates to a preparation method of anode composite conductive binders for lithium ion batteries. Background technique [0002] Lithium-ion batteries have been widely used as power sources for mobile devices such as mobile phones, computers, and electric vehicles due to their high operating voltage, high specific energy, fast charging, and long cycle life. It is mainly composed of positive and negative electrodes, electrolyte, diaphragm and shell. The electrodes are mainly composed of active materials, conductive agents, binders and current collectors. The performance of lithium-ion batteries has a great relationship with the electrode manufacturing process, such as the performance of the binder and the ratio of active materials, conductive agents, and binders. [0003] Lithium-ion battery binder is a kind of polymer material with binding effect. Throughout the elec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62
CPCY02E60/10
Inventor 王军许克唐妮杜延华李秀芬韩瑞芹陈鲁昌
Owner SHANDONG HUAXIA SHENZHOU NEW MATERIAL
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