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A preparation method of a modified carbon nanotube negative electrode material

A negative electrode material and carbon nanotube technology, applied in negative electrodes, active material electrodes, battery electrodes, etc., can solve problems affecting uniform dispersion, stability, and poor compatibility, and achieve good electrical conductivity and mechanical strength. Reunion, beneficial to the effect of dispersion

Active Publication Date: 2018-12-18
NANTONG BAICHUAN NEW MATERIAL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Since the diameter of carbon nanotubes is generally between a few nanometers and tens of nanometers, and the thickness of the tube wall is only a few nanometers, it has a large specific surface area and surface energy. Therefore, carbon nanotubes are prone to agglomeration, which affects the Its uniform dispersion and stability lead to poor compatibility with the modified composite material, so that carbon nanotubes are uniformly dispersed in the composite material, and its surface modification is very necessary

Method used

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  • A preparation method of a modified carbon nanotube negative electrode material

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Embodiment 1

[0021] The preparation method of the modified carbon nanotube negative electrode material in this embodiment, the preparation method comprises the following steps:

[0022] (1) Mix 2g polyethylene glycol and 10g carbon nanotube material in 20g water to obtain mixture A;

[0023] (2) Mixture A was stirred at 20°C for 2 hours and then filtered to obtain mixture B;

[0024] (3) centrifuging the mixture B to obtain the modified carbon nanotube material;

[0025] (4) Prepare the modified carbon nanotube material and the graphite negative electrode material according to the ratio of 1:30 to form a mixed solution of ethanol with a solid content of 25%;

[0026] (5) After the mixed solution was centrifuged, the solid was dried at 50°C for 5 hours and used as the negative electrode material of the battery.

Embodiment 2

[0028] The preparation method of the modified carbon nanotube negative electrode material in this embodiment, the preparation method comprises the following steps:

[0029] (1) Mix 0.2g polyethylene glycol and 20g carbon nanotube material in 50g water to obtain mixture A;

[0030] (2) Mixture A was stirred at 90°C for 1 hour and then filtered to obtain mixture B;

[0031] (3) centrifuging the mixture B to obtain the modified carbon nanotube material;

[0032] (4) Prepare the modified carbon nanotube material and the graphite negative electrode material according to the ratio of 1:4 to form an ethanol mixed solution with a solid content of 25%;

[0033] (5) After centrifuging the mixed solution, take the solid and dry it at 300°C for 1 hour and use it as the negative electrode material of the battery.

Embodiment 3

[0035] The preparation method of the modified carbon nanotube negative electrode material in this embodiment, the preparation method comprises the following steps:

[0036] (1) Mix 1g polyethylene glycol and 10g carbon nanotube material in 30g water to obtain mixture A;

[0037] (2) Mixture A was stirred at 50°C for 1.5h and then filtered to obtain mixture B;

[0038] (3) centrifuging the mixture B to obtain the modified carbon nanotube material;

[0039] (4) Prepare the modified carbon nanotube material and the graphite negative electrode material according to the ratio of 1:10 to form a mixed solution of ethanol with a solid content of 25%;

[0040] (5) After the mixed solution was centrifuged, the solid was dried at 200°C for 2 hours and used as the negative electrode material of the battery.

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Abstract

The invention relates to a preparation method of a modified carbon nanotube negative electrode material, comprising the following steps: (1) mixing polyethylene glycol and carbon nanotube material inwater to obtain a mixture A; (2) stirring and filtering mixture A to obtain mixture B; 3) centrifuge that mixture B to obtain modified carbon nanotube material; (4) preparing 25% ethanol mixed solution of modified carbon nanotube material and graphite negative electrode material according to proportion; (5) centrifugal separation of the mixed solution and drying of the solid to be used as the negative electrode material of the battery. The invention has the advantages that after the carbon nanotube material is processed, the specific surface area and the surface energy of the carbon nanotube material are changed, thereby being more conducive to the dispersion of the carbon nanotube, and the carbon nanotube is not easy to agglomerate; In addition, polyethylene glycol (PEG) can cross-link carbon nanotubes and graphite to form carbon nanotubes after graphite is mixed and cured. Carbon network structure, so that the negative electrode material has better conductivity and mechanical strength, prolonging the service life of the battery.

Description

technical field [0001] The invention belongs to the field of new energy battery materials, and in particular relates to a preparation method of a modified carbon nanotube negative electrode material of a lithium ion battery. Background technique [0002] Large-scale energy storage, electric tools, electric vehicles, and portable electronic devices have put forward higher and higher requirements for the specific energy, specific power, safety, and cycle life of lithium-ion batteries. Although the performance of lithium-ion batteries is affected by many factors such as positive and negative electrode materials, electrolytes, binders, current collectors, and separators, the key to affecting its electrochemical performance lies in the performance of the electrolyte and positive and negative electrode materials that make up the battery. The negative electrode materials are It is one of the keys that affect the electrochemical performance of lithium-ion batteries. [0003] Carbon...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/587H01M4/62H01M10/0525
CPCH01M4/364H01M4/587H01M4/625H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 郑铁江蒋国强曹圣平赵跃马俊华强国俊姜伟伟
Owner NANTONG BAICHUAN NEW MATERIAL CO LTD
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