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Composite conductive agent and preparation method thereof and electrode material containing composite conductive agent

A technology of composite conductive agent and electrode material, applied in battery electrodes, circuits, electrical components, etc., can solve the problem of weakening the conductivity of graphene lithium ion steric hindrance effect, etc., to improve the electron transport ability and electron transport performance. , the effect of reducing the demand

Active Publication Date: 2020-01-31
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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  • Composite conductive agent and preparation method thereof and electrode material containing composite conductive agent
  • Composite conductive agent and preparation method thereof and electrode material containing composite conductive agent
  • Composite conductive agent and preparation method thereof and electrode material containing composite conductive agent

Examples

Experimental program
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Effect test

Embodiment 1

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

[0056] The preparation method of composite conductive agent described in this embodiment is as follows:

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

[0058] (2) Add 1 g of carbon nanotubes to 20 mL of concentrated nitric acid, heat to reflux at 75 °C for 4 h, filter after cooling, wash twice with deionized water, centrifuge, dry at 80 °C for 6 h, and redisperse in tetrahydrofuran to obtain Oxidized carbon nanotube dispersion, wherein the carbon nanotubes have a diameter of 50 nm and a length of 5 μm.

[0059] (3) Mix the graphene oxide dispersion obtained in step (1) with the carbon dioxide nanotube dispersion obtained in step (2), then add 0.1 g of 1-(3-dimethylaminopropyl)-3-ethane A mixed solution of carbodiimide hydrochloride (EDC) and 0.1 g of N-hydroxysuccinim...

Embodiment 2

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

[0066] The preparation method of composite conductive agent described in this embodiment is as follows:

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

[0068] (2) Add 1 g of carbon nanotubes to 20 mL of concentrated nitric acid, heat to reflux at 90°C for 0.5h, filter after cooling, wash twice with deionized water, centrifuge, dry at 80°C for 6h, and redisperse in tetrahydrofuran, A dispersion of oxidized carbon nanotubes was obtained, wherein the carbon nanotubes had a diameter of 500 nm and a length of 0.5 μm.

[0069] (3) Mix the graphene oxide dispersion obtained in step (1) with the carbon dioxide nanotube dispersion obtained in step (2), then add 0.1 g of 1-(3-dimethylaminopropyl)-3-ethane A mixed solution of carbodiimide hydrochloride (EDC) and 0.1 g of N-hydroxy...

Embodiment 3

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

[0072] The preparation method of composite conductive agent described in this embodiment is as follows:

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

[0074] (2) Add 1 g of carbon nanotubes to 20 mL of concentrated nitric acid, heat and reflux at 60°C for 12h, filter after cooling, wash twice with deionized water, centrifuge, dry at 120°C for 2h, and redisperse in tetrahydrofuran to obtain Oxidized carbon nanotube dispersion, wherein the carbon nanotubes have a diameter of 100 nm and a length of 1 μm.

[0075] (3) Mix the graphene oxide dispersion obtained in step (1) with the carbon dioxide nanotube dispersion obtained in step (2), then add 0.1 g of 1-(3-dimethylaminopropyl)-3-ethane A mixed solution of carbodiimide hydrochloride (EDC) and 0.1g of N-hydroxysuccinimide (N...

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Abstract

The invention relates to a composite conductive agent and a preparation method thereof and an electrode material containing the composite conductive agent. The composite conductive agent comprises graphene and carbon nanotubes. The graphene and the carbon nanotubes are connected through chemical bonds. The graphene and the carbon nanotubes are bridged by the chemical bonds so that the electron transfer between the two conductive agents can be enhanced, the surface contact with the active material and the long-range conductive capability of the conductive agent are both considered, the steric hindrance effect of the graphene on lithium ions can also be reduced, the dispersion capability in the electrode material can be improved and the conductivity of the electrode piece containing the composite conductive agent is enabled to be as high as 0.5-1.1 S / cm and the internal resistance of the battery containing the composite conductive agent is enabled to be as low as 20-65ohm. The preparation method is simple and easy to operate and realizes the chemical bond connection between the graphene and the carbon nanotubes and dopes nitrogen atoms in the conductive agent through NHS treatment sothat the electron transfer rate inside the electrode can be effectively improved after the conductive agent is added into the electrode and the electrical conductivity is further enhanced.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a composite conductive agent, a preparation method thereof and an electrode material containing the same. Background technique [0002] Conductive agent materials are an important part of lithium-ion batteries and play an important role in the electrochemical performance of lithium-ion batteries. After an appropriate amount of conductive agent is added to the electrode, the electron transfer rate inside the electrode can be effectively improved. An excellent conductive agent should have the following characteristics: 1. High electrical conductivity, which can increase the electron migration rate; 2. High specific surface area, easy to contact active materials; 3. Easy to disperse, and can be better in the slurry preparation process Mixed with positive and negative materials. [0003] Graphene conductive agent is a new type of conductive agent developed in the pa...

Claims

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Application Information

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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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