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Carbon nanotube conductive composite and preparation method thereof

A technology of carbon nanotubes and composites, which is applied in the manufacture of cables/conductors, conductive materials dispersed in non-conductive inorganic materials, circuits, etc., can solve the problem of difficulty in preparing conductive paste with high carbon nanotube content and poor storage stability Good and other problems, to achieve good storage stability, good performance, good dispersion effect

Active Publication Date: 2020-07-17
内蒙古骏成新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention aims at the poor storage stability of the carbon nanotube slurry obtained by chemically or physically modifying the surface of the carbon nanotube at present, and it is difficult to prepare a high carbon nanotube content conductive material by using a gel-state carbon nanotube dispersion system. For the problem of slurry, a carbon nanotube conductive compound and its preparation method are provided

Method used

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  • Carbon nanotube conductive composite and preparation method thereof
  • Carbon nanotube conductive composite and preparation method thereof
  • Carbon nanotube conductive composite and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] 1) Dissolve 1 part of polyvinylpyrrolidone and 0.5 part of pyrazine in 94.5 parts of N-methylpyrrolidone, and then add 4 parts of carbon nanotubes (outer diameter 8nm to 12nm, specific surface area 265m 2 / g) stirring to obtain a predispersion;

[0038] 2) Add the pre-dispersion to a sand mill for rough grinding for 1 hour, and the rough grinding line speed is 7m / s;

[0039] 3) Finely grind for 3 hours after coarse grinding, the fine grinding line speed is 9m / s, and finely grind until the slurry composite fineness is ≤10μm and the viscosity is 1698mPa·s.

[0040] Detect the properties of the prepared slurry composite:

[0041] 1. Observe the appearance and viscosity changes of the prepared slurry composite within 360 days. The test results are shown in Table 1. figure 1 and figure 2 .

[0042] 2. Volume resistivity of lithium iron phosphate positive electrode sheet containing 1% carbon nanotubes: at the end of sand milling, take the prepared slurry compound and mi...

Embodiment 2

[0044] 1) Dissolve 0.8 parts of polyvinylpyrrolidone and 0.12 parts of pyrazine in 98.08 parts of N-methylpyrrolidone, and then add 1 part of carbon nanotubes (outer diameter 4nm to 6nm, specific surface area 496m 2 / g) stirring to obtain a predispersion;

[0045] 2) Add the pre-dispersion to a sand mill for rough grinding for 1 hour, and the rough grinding line speed is 6m / s;

[0046] 3) Finely grind for 3 hours after coarse grinding, the fine grinding line speed is 9.5m / s, and finely grind until the slurry composite fineness is ≤10μm and the viscosity is 4294mPa·s.

[0047] The performance of the prepared slurry composite is detected with reference to the method in Example 1, and the detection results are shown in Table 1, figure 2 and image 3 .

Embodiment 3

[0049] 1) Dissolve 1 part of polyvinylpyrrolidone in 95.5 parts of N-methylpyrrolidone, and then add 3 parts of carbon nanotubes (outer diameter 6nm ~ 10nm, specific surface area 327m 2 / g) stirring to obtain a predispersion;

[0050] 2) Add the pre-dispersion liquid and 0.5 parts of pyridine into the sand mill for rough grinding for 1.5 hours, and the rough grinding line speed is 6m / s;

[0051] 3) Fine grinding for 3.5 hours after coarse grinding, the fine grinding line speed is 9.5m / s, until the fineness of the slurry composite is ≤10μm and the viscosity is 2672mPa·s.

[0052] The performance of the prepared slurry composite is detected with reference to the method in Example 1, and the detection results are shown in Table 1, figure 2 and image 3 .

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Abstract

The invention discloses a carbon nanotube conductive composite and a preparation method thereof. The carbon nanotube conductive composite comprises, by mass percentage, at least 1% of carbon nanotubes, 0.1%-1.0% of a pi-pi action control agent, a dispersant and a dispersion medium, wherein the pi-pi action control agent is a nitrogen-containing heterocyclic organic matter. According to the preparation method, a kinetic method is adopted, pi-pi interaction among the carbon nanotubes is utilized, and the conductive composite can form a reversible gel system on the basis of ensuring that the system has high carbon nanotube content by controlling the pi-pi action among the carbon nanotubes in the system so that the conductive composite has good dispersion and stable storage performance and good use performance as conductive paste.

Description

technical field [0001] The invention relates to the application field of carbon nanotubes, in particular to a carbon nanotube conductive composite and a preparation method thereof. Background technique [0002] Carbon nanotubes have excellent electrical conductivity and electrochemical stability, and conductive pastes prepared with them as conductive agents are widely used in the field of lithium-ion batteries. In order to meet the increasingly high conductivity requirements of the conductive agent in the lithium battery field, the carbon nanotubes in the conductive paste continue to develop in the direction of finer diameter and higher aspect ratio. However, the smaller the diameter of the carbon nanotubes in the conductive paste and the larger the aspect ratio, the easier it is for the carbon nanotubes to agglomerate, resulting in a more unstable conductive paste. This instability is manifested in two aspects: on the one hand, the viscosity of the newly produced slurry is...

Claims

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Application Information

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IPC IPC(8): H01B1/24H01B13/00H01M4/62H01M10/052
CPCH01B1/24H01B13/00H01M4/625H01M10/052Y02E60/10
Inventor 周平杨兆锞陈思贝沈跃成
Owner 内蒙古骏成新能源科技有限公司
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