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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AI-Extracted Technical Summary

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 prep...

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.

Application Domain

Cell electrodesNon-conductive material with dispersed conductive material +2

Technology Topic

ChemistryElectrically conductive +5

Image

Examples

Experimental program(4)
Comparison scheme(3)

Example Embodiment

[0036] Example 1

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

[0038] 2) Add the pre-dispersed liquid to the sand mill for rough grinding for 1 hour, and the linear speed of rough grinding is 7m/s;

[0039] 3) After rough grinding, fine grinding is performed for 3 hours, the linear speed of fine grinding is 9m/s, and the fineness of slurry composite is ≤10μm and the viscosity is 1698mPa·s.

[0040] Test the performance of the prepared slurry compound:

[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. The volume resistivity of lithium iron phosphate positive pole piece containing 1% carbon nanotubes: At the end of sanding, take the prepared slurry composite and mix it according to lithium iron phosphate: carbon nanotubes: PVDF = 95.5: 1.0: 3.5, After 1h of ball milling, the positive electrode slurry was obtained; the positive electrode slurry was coated on the PET film with an automatic film coating machine, and the dried pole piece was made into a 15mm diameter disc with a smooth and uniform surface using a punching machine. The needle tester measures the volume resistivity of the pole piece; subsequently, the conductive composite prepared above is taken every certain time interval to measure the volume resistivity of the pole piece according to the above method. See the test results image 3

Example Embodiment

[0043] Example 2

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

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

[0046] 3) After rough grinding, fine grinding is performed for 3h, the linear speed of fine grinding is 9.5m/s, and the fineness of slurry composite is ≤10μm and the viscosity is 4294mPa·s.

[0047] Refer to the method in Example 1 to test the properties of the prepared slurry composite. The test results are shown in Table 1. figure 2 and image 3.

Example Embodiment

[0048] Example 3

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

[0050] 2) Add the pre-dispersed liquid and 0.5 parts of pyrimidine to the sand mill for coarse grinding for 1.5 hours, and the linear speed of coarse grinding is 6m/s;

[0051] 3) After rough grinding, fine grinding is carried out for 3.5h, the linear speed of fine grinding is 9.5m/s, and the fineness of slurry composite is ≤10μm and the viscosity is 2672mPa·s.

[0052] Refer to the method in Example 1 to test the properties of the prepared slurry composite. The test results are shown in Table 1. figure 2 and image 3.

PUM

Property	Measurement	Unit
Diameter	1.0 ~ 20.0	nm
Specific surface area	>= 150.0	m²/g
Outer diameter	8.0 ~ 12.0	nm

Description & Claims & Application Information

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Classification and recommendation of technical efficacy words

good storage stability
well dispersed

Polyester resin for rapid curing of weather-durable powdery paint by beta-hydroxyalkylamide and preparation method thereof

InactiveCN102443148Ahigh glass transition temperaturegood storage stability

Owner:GUANGZHOU QINGTIAN INDAL

Carbon nanotube conductive composite and preparation method thereof

AI-Extracted Technical Summary

Problems solved by technology

Abstract

Image

Examples

Example Embodiment

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

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