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One-dimensional carbon fiber/carbon nanotube composite material, its preparation method and application

A carbon nanotube, composite material technology, used in structural parts, electrical components, battery electrodes, etc.

Active Publication Date: 2021-02-05
哈尔滨万鑫石墨谷科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the above-mentioned invention has limited improvement on the ionic conductivity of carbon fiber, and the application of lithium batteries has limited improvement on the rate performance, which is difficult to meet the needs of practical applications. Therefore, it is necessary to provide a one-dimensional carbon composite material with high ionic conductivity and excellent strength. In order to improve the rate performance of lithium-ion batteries, and then meet the needs of practical applications

Method used

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  • One-dimensional carbon fiber/carbon nanotube composite material, its preparation method and application
  • One-dimensional carbon fiber/carbon nanotube composite material, its preparation method and application
  • One-dimensional carbon fiber/carbon nanotube composite material, its preparation method and application

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] (1) Add the organic high molecular polymer PVP into the solvent NMP to obtain a dispersion liquid with a solid content of 1%.

[0068] (2) Mix the powders of carbon nanotubes (CNT) and carbon fibers (CF) according to the mass ratio of 0.1:99.9, so that the two are uniformly dispersed to obtain a mixed powder, and the mixed powder is mixed with the dispersion liquid of step (1) , so that the solid content of the resulting conductive paste was 3%.

[0069] (3) The conductive paste of step (2) is first passed through low-energy ball milling. The equipment used in low-energy ball milling is a vertical ball mill, and the grinding balls are zirconium balls and ceramic balls with a size of 5mm-6mm. Ball milling time 4h.

[0070] (4) Then undergo shear dispersion, the shear speed is 1500 rpm, and the shear dispersion time is 1 h.

[0071] (5) After high-energy ball milling, the equipment used in high-energy ball milling is a horizontal fine mill, and the grinding balls are zi...

Embodiment 2

[0078] (1) The mixture of organic high molecular polymer PVP and PVDF is added to solvent H 2 O, a dispersion with a solid content of 5% was obtained.

[0079] (2) Putting carbon nanotubes (CNTs) into a part of the dispersion in step (1) to obtain a slurry of carbon nanotubes with a solid content of 5%.

[0080] (3) The slurry of the carbon nanotubes in step (2) is first passed through low-energy ball milling. The equipment used in low-energy ball milling is a vertical ball mill, and the grinding balls are zirconium balls and ceramic balls with a size of 10mm-20mm. 70Hz, low-energy ball milling time 8h; then after shear dispersion, the shear speed is 4000rpm, and the shear dispersion time is 1h; after high-energy ball milling, the equipment used for high-energy ball milling is a horizontal fine mill, and the size of the grinding balls is 0.4 mm-0.6mm zirconium balls and ceramic balls, etc., the speed of high-energy ball milling is 1000rpm, and the time of high-energy ball mil...

Embodiment 3

[0086] (1) Add the organic high molecular polymer PE into the solvent NMP to obtain a dispersion liquid with a solid content of 0.1%.

[0087] (2) Mix the powder of carbon nanotube (CNT) and carbon fiber (CF) according to the mass ratio of 1:99, make the two disperse evenly to obtain mixed powder, mix the mixed powder with the dispersion liquid of step (1) , so that the solid content of the resulting conductive paste was 16%.

[0088] (3) The conductive paste of step (2) is first passed through low-energy ball milling. The equipment used in low-energy ball milling is a vertical ball mill, and the grinding balls are zirconium balls and ceramic balls with a size of 8mm-10mm. Ball milling time 12.5h.

[0089] (4) Then undergo shear dispersion, the shear speed is 1300rpm, and the shear dispersion time is 1.5h.

[0090] (5) After high-energy ball milling, the equipment used in high-energy ball milling is a horizontal fine mill, and the grinding balls are zirconium balls and ceram...

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Abstract

The invention relates to a one-dimensional carbon fiber / carbon nanotube composite material, its preparation method and application. The method of the present invention comprises the steps of sequentially performing low-energy ball milling, shear dispersion, high-energy ball milling and high-energy nanometerization on the conductive slurry, wherein the conductive slurry is a mixed slurry of carbon fibers and carbon nanotubes, or a slurry of carbon fibers material, or a slurry of carbon nanotubes. Adopting the method of the present invention can not only solve the problem that carbon nanotubes and carbon fibers are easy to agglomerate, obtain a one-dimensional carbon fiber / carbon nanotube composite material with good dispersion and stability, but also improve the strength of carbon fibers and improve antistatic properties. Improve the safety performance of the prepared battery, and use the one-dimensional carbon fiber / carbon nanotube composite material of the present invention to prepare a lithium battery, which can greatly improve the rate performance of the lithium battery, and the 30C capacity is more than 76.4% of the 1C capacity.

Description

technical field [0001] The invention belongs to the field of new energy materials such as lithium batteries, and relates to a carbon fiber / carbon nanotube composite material, its preparation method and application, in particular to a one-dimensional carbon fiber / carbon nanotube composite material, its preparation method and its application in lithium ion batteries the use of. Background technique [0002] Carbon fiber is a one-dimensional carbon material. It was used as a negative electrode material in early lithium batteries. However, due to its low ion mobility in the length direction, the rate performance is not very good. It is gradually replaced by spherical natural graphite and artificial graphite. replace. [0003] In recent years, various methods have been used to improve its conductivity in order to be well applied in lithium batteries. CN104779378A provides a kind of preparation method of germanium-mesoporous carbon fiber composite lithium battery negative electr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/133
CPCH01M4/133H01M4/362Y02E60/10
Inventor 李然袁国辉方振辉杨斌冯晓彤杜新伟
Owner 哈尔滨万鑫石墨谷科技有限公司
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