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Carbon nano tube electric conduction slurry and preparation method and application thereof

A technology of carbon nanotubes and conductive pastes, applied in the direction of nanotechnology, nanotechnology, conductive materials dispersed in non-conductive inorganic materials, etc., can solve the problem of affecting the conductivity of lithium-ion batteries, affecting the physical properties of carbon nanotubes, and agglomeration Settlement and other problems, to achieve the effect of easy implementation and large-scale popularization and application, low production cost, and energy saving

Active Publication Date: 2014-06-25
SHENZHEN NANOTECH PORT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the strong van der Waals force between carbon nanotubes, the carbon nanotubes are entangled with each other, making it difficult to disperse uniformly into the material, thus affecting the physical performance of the carbon nanotubes themselves.
[0004] At present, in the carbon nanotube conductive paste used in the production of lithium batteries, the content of carbon nanotubes is about 2 to 5%, and the grinding time needs to be more than 6 hours, which is prone to agglomeration and sedimentation, and has a short shelf life.
The content of carbon nanotubes added to the positive and negative electrode material slurry of lithium-ion batteries is about 0.5-2%. Since carbon nanotubes are in the form of fibers, while the positive electrode materials are in the form of particles, this difference makes carbon nanotubes and positive electrode materials It exists in a point contact state, which affects the conductivity of lithium-ion batteries

Method used

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  • Carbon nano tube electric conduction slurry and preparation method and application thereof
  • Carbon nano tube electric conduction slurry and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 500 g of carbon nanotube groups prepared from multi-walled carbon nanotubes, 100 g of polyvinylpyrrolidone and 9.4 kg of N-methylpyrrolidone were stirred and mixed for 5 minutes, and then ground for 20 minutes in a grinder with grinding media , wherein, the linear velocity of the grinding machine dispersing disc is 10 meters per second, and the grinding medium is a zirconium bead of 1mm, and after grinding, stable carbon nanotube conductive paste containing spherical carbon nanotube groups is obtained. In the present embodiment, the conductive The carbon nanotube group in the slurry is in the shape of an ellipsoid, and its scanning image is as follows figure 1 shown.

Embodiment 2

[0030] 500 g of carbon nanotube aggregates prepared from multi-walled carbon nanotubes, 100 g of polyvinylpyrrolidone, and 9.4 kg of N-methylpyrrolidone were stirred and mixed for 5 minutes, and then ground for 5 seconds in a media-free sand mill clock, wherein, the sand mill dispersing disc linear velocity is 50 m / s, obtains the stable carbon nanotube conductive paste containing spherical carbon nanotube groups, in the present embodiment, the carbon nanotube group in the conductive paste It is ellipsoidal, and its scanning image is as follows figure 2 shown.

Embodiment 3

[0032] 500 grams of multi-walled carbon nanotubes are used to prepare carbon nanotube aggregates, 50 grams of sodium carboxymethylcellulose and 9.45 kilograms of water and stir and mix for 5 minutes, then grind for 20 minutes in a grinder with grinding media, wherein, The linear speed of the dispersion disc of the grinder is 10 m / s, and the medium is a zirconium bead of 1 mm, so as to obtain a stable carbon nanotube conductive paste containing spherical carbon nanotube groups. In this embodiment, the carbon nanotube in the conductive paste The group is ellipsoidal.

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Abstract

The invention discloses carbon nano tube electric conduction slurry and a preparation method and the application of the carbon nano tube electric conduction slurry. The carbon nano tube electric conduction slurry is composed of, by mass, 2% to 10% of electric conduction function body, 0.2% to 5% of dispersing agent and 85% to 97.8% of solvent. The electric conduction function body is spherical carbon nano tube groups or spherical carbon nano tube aggregates or the combination between the spherical carbon nano tube groups or the spherical carbon nano tube aggregates and one or more of carbon black, acetylene black, carbon fibers, conductive graphite and grapheme. The preparation method comprises the steps that the electric conduction function body and the dispersing agent are added into the solvent according to the percentage to be mixed, premix is obtained, the premix is ground in a grinding machine, and the electric conduction slurry containing a plurality of spherical carbon nano tube groups with the grain size ranging from 0.1 micron to 3 microns is formed. The carbon nano tube electric conduction slurry can be used as electric conduction agents of positive electrode and negative electrode materials of a lithium battery. According to the electric conduction slurry, an electric conduction network coating base materials is easily formed, the preparation technology is simple, production efficiency is high, and the obtained carbon nano tube slurry is good in stability and long in shelf life.

Description

【Technical field】 [0001] The invention relates to a carbon nanotube conductive material, in particular to a carbon nanotube conductive paste and its preparation method and application. 【Background technique】 [0002] Carbon nanotubes are excellent conductive agents, their size is generally 2-100 nanometers, and their length can reach 10-50 microns. Carbon nanotubes can not only play the role of wires in the conductive network, but also have the electric double layer effect and high rate characteristics of supercapacitors. At the same time, the good thermal conductivity of carbon nanotubes is beneficial to the heat dissipation of the battery during charging and discharging, reducing the polarization of the battery, improving the high and low temperature performance of the battery, and prolonging the life of the battery. [0003] Sheem et al. (Journal of Power Sources2006, 158, 1425-1430) compared the effects of multi-walled carbon nanotubes and traditional conductive carbon ...

Claims

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Application Information

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IPC IPC(8): H01B1/24H01M4/62H01B13/00B82Y30/00
CPCY02E60/10
Inventor 郜天宇赵红娟梁颖
Owner SHENZHEN NANOTECH PORT
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