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A kind of composite conductive agent, its preparation method and electrode material containing it

A composite conductive agent, graphene technology, applied in battery electrodes, circuits, electrical components and other directions, can solve the problems of weakening the conductivity of graphene lithium ion steric hindrance effect, etc., to improve the electron transport capacity, the preparation method is simple and easy Operation, the effect of improving the electron transfer rate

Active Publication Date: 2021-08-27
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above method cannot take into account the two aspects of weakening the lithium ion steric effect of graphene and improving the conductivity.

Method used

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  • A kind of composite conductive agent, its preparation method and electrode material containing it
  • A kind of composite conductive agent, its preparation method and electrode material containing it
  • A kind of composite conductive agent, its preparation method and electrode material containing it

Examples

Experimental program
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Effect test

Embodiment 1

[0055] This embodiment provides a composite conductive agent and a preparation method thereof.

[0056] The preparation method of the composite conductive agent of the present embodiment is as follows:

[0057] (1) 9 g of oxide oxide is dispersed in 1.8 kg of tetrahydrofuran to obtain a graphene dispene, wherein the oxide oxide has a diameter of 0.05 μm.

[0058] (2) 1 g of carbon nanotubes were added to 20 mL of concentrated nitric acid, and heat refluxed at 75 ° C for 4 h, and then filtered, washed twice with deionized water, centrifuged, at 80 ° C for 6 h, redistributed in tetrahydrofuran, obtained Carbon oxide nanotube dispersion, wherein the carbon nanotubes have a diameter of 50 nm and a length of 5 μm.

[0059] (3) Mix the oxide nanotube dispersion obtained by step (1) and the carbon oxide nanotube dispersion obtained by step (2), adding 0.1 g of 1- (3-dimethylaminopropyl) -3-B Mixed solution of base carbon diimide hydrochloride (EDC) and 0.1 g of N-hydroxybutyimide (NHS), ...

Embodiment 2

[0065] This embodiment provides a composite conductive agent and a preparation method thereof.

[0066] The preparation method of the composite conductive agent of the present embodiment is as follows:

[0067] (1) 5 g of oxide oxide is dispersed in 1.5 kg of tetrahydrofuran to obtain a graphene dispene dispersion, wherein the oxide oxide has a diameter of 0.5 μm.

[0068] (2) 1 g of carbon nanotubes were added to 20 mL of concentrated nitric acid, and the heat reflux was 0.5 h at 90 ° C, and then filtered, washed twice with deionized water, centrifuged at 80 ° C for 6 h, and redistributed in tetrahydrofuran. The carbon oxide nanotube dispersion is obtained, wherein the carbon nanotube has a diameter of 500 nm and a length of 0.5 μm.

[0069] (3) Mix the oxide nanotube dispersion obtained by step (1) and the carbon oxide nanotube dispersion obtained by step (2), adding 0.1 g of 1- (3-dimethylaminopropyl) -3-B Mixed solution of carbon diimide hydrochloride (EDC) and 0.1 g of N-hydr...

Embodiment 3

[0071] This embodiment provides a composite conductive agent and a preparation method thereof.

[0072] The preparation method of the composite conductive agent of the present embodiment is as follows:

[0073] (1) 15 g of oxide oxide is dispersed in 2 kg of tetrahydrofuran to obtain a graphene dispene, wherein the oxide oxide has a diameter of 1 μm.

[0074] (2) 1 g of carbon nanotubes were added to 20 mL of concentrated nitric acid, and heat reflux at 60 ° C for 12 h, and then filtered, washed twice with deionized water, centrifuged, 120 ° C for 2 h, and reissue in tetrahydrofuran. Carbon oxide nanotube dispersion, wherein the carbon nanotubes have a diameter of 100 nm and a length of 1 μm.

[0075] (3) Mix the oxide nanotube dispersion obtained by step (1) and the carbon oxide nanotube dispersion obtained by step (2), adding 0.1 g of 1- (3-dimethylaminopropyl) -3-B Mixed solution of base carbon diamine hydrochloride (EDC) and 0.1 g of N-hydroxybutyimide (NHS), at 150 ° C temper...

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Abstract

The invention relates to a composite conductive agent, a preparation method thereof and an electrode material containing the same. The composite conductive agent includes graphene and carbon nanotubes, and the graphene and carbon nanotubes are connected by chemical bonds. In the present invention, graphene and carbon nanotubes are bridged by chemical bonds, which enhances the electron transfer between the two conductive agents, takes into account the surface contact with the active material and the long-range conductivity of the conductive agent, and at the same time reduces the resistance of graphene to lithium ions. The steric hindrance effect improves the dispersion ability in the electrode material, so that the conductivity of the pole piece containing the composite conductive agent is as high as 0.5-1.1S / cm, and the internal resistance of the battery containing it is as low as 20-65Ω. The preparation method of the present invention is simple and easy to operate. It not only realizes the chemical bond connection between graphene and carbon nanotubes, but also makes the conductive agent doped with nitrogen atoms through NHS treatment, so that it can effectively increase the electron density inside the electrode after it is added to the electrode. The transfer rate and conductivity are further enhanced.

Description

Technical field [0001] The present invention belongs to the field of lithium ion batteries, and more particularly to a composite conductive agent, a preparation method thereof, and an electrode material comprising therethrough. Background technique [0002] The conductive agent material is an important part of the lithium ion battery, which plays an important role in electrochemical properties of the lithium ion battery. After the appropriate amount of conductive agent is added to the electrode, the electron transfer rate inside the electrode can be effectively improved. Excellent conductive agents should have the following characteristics: 1, higher electrical conductivity, improve the electron migration rate; 2, high ratio surface area, easy to contact the active material; 3, easy to disperse, can be better during the slurry configuration It is mixed with positive and negative electrode materials. [0003] The grapher conductive agent is a new type of conductive agent developed...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M10/0525
CPCH01M4/625H01M10/0525Y02E60/10
Inventor 谭强强王鹏飞
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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