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Carbon nanotube conductive paste and preparation method thereof

A carbon nanotube, conductive paste technology, applied in conductive materials dispersed in non-conductive inorganic materials, cable/conductor manufacturing, circuits, etc., can solve the problems of reduced conductivity, difficult dispersion, low conductivity, etc. The effect of preventing collision and aggregation, weakening action energy, and enhancing electrical conductivity

Active Publication Date: 2020-07-10
深圳市金百纳纳米科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the anode materials of lithium-ion batteries are generally transition metal oxides or phosphates of transition metals, which have low conductivity and are generally semiconductors or insulators. In order to improve the conductivity of lithium-ion batteries, the charging and discharging efficiency of electrode materials Comprehensive performance, so as to improve the comprehensive performance of battery charging and discharging, the conductive paste must be added in the process of battery preparation
[0003] Carbon nanotube slurry products have excellent properties such as high electrical conductivity, high thermal conductivity, easy lubrication, corrosion resistance, thin sheets, and large aspect ratio. They are easy to disperse into a variety of material matrices and are suitable for batteries. Slurries usually use carbon nanotubes with a small aspect ratio to obtain better dispersion, but this will lose the physical properties of carbon nanotubes to a certain extent and reduce electrical conductivity
However, carbon nanotubes with a high aspect ratio have a large specific surface area and are difficult to disperse, and the higher the concentration, the greater the viscosity of the prepared slurry, the worse the fluidity, and it is difficult to disperse, which is inconvenient for the preparation of conductive paste and subsequent production and processing. or pipeline metering

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A carbon nanotube conductive paste, the conductive paste is composed of the following components in weight percentage: 0.8 parts of carbon nanotubes with a length of 10 μm and a diameter of 5 nm; 0.5 parts of montmorillonite / nano-silver composite; polyvinylpyrrolidone 0.3 parts; 39.4 parts of water, 59 parts of N,N-dimethylformamide.

[0028] Mix the above-mentioned montmorillonite / nano-silver composite with water, and magnetically stir for 2 hours at a speed of 200rpm to obtain a montmorillonite / nano-silver composite solution; add the above-mentioned carbon nanotubes to the montmorillonite / nano-silver composite solution , disperse at 150W ultrasonic power for 0.5h to obtain a mixed solution, add the mixed solution to N,N-dimethylformamide, add polyvinylpyrrolidone, perform ultrasonic treatment again, and disperse at 200W ultrasonic power for 1h to obtain carbon nano Tube of conductive paste.

Embodiment 2

[0030] A carbon nanotube conductive paste, the conductive paste is composed of the following components in weight percentage: 1 part of carbon nanotube with a length of 28 μm and a diameter of 11 nm; 1.2 parts of montmorillonite / nano-silver composite; polyethylene glycol 2.6 parts of alcohol; 31.7 parts of water, 63.5 parts of N,N-dimethylacetamide.

[0031] Mix the above-mentioned montmorillonite / nano-silver composite with water, and magnetically stir for 2.5 hours at a speed of 320rpm to obtain a montmorillonite / nano-silver composite solution; add the above-mentioned carbon nanotubes to the montmorillonite / nano-silver composite solution , disperse at 350W ultrasonic power for 1h to obtain a mixed solution, add the mixed solution to N,N-dimethylacetamide, add polyethylene glycol, perform ultrasonic treatment again, and disperse at 400W ultrasonic power for 1.5h to obtain Carbon nanotube conductive paste.

Embodiment 3

[0033] A carbon nanotube conductive paste, the conductive paste is composed of the following components in weight percentage: 6.5 parts of carbon nanotubes with a length of 50 μm and a diameter of 15 nm; 2 parts of kaolinite / nano-silver composite; polyvinyl alcohol 5 parts; 30.9 parts of water, 55.6 parts of N,N-dimethylacetamide.

[0034] The above-mentioned montmorillonite / nano-silver composite was mixed with water, and magnetically stirred at a speed of 600rpm for 3h to obtain a kaolinite / nano-silver composite solution; the above-mentioned carbon nanotubes were added to the kaolinite / nano-silver composite solution, Disperse at 500W ultrasonic power for 1.5h to obtain a mixed solution, add the mixed solution to N,N-dimethylformamide, add polyvinyl alcohol, perform ultrasonic treatment again, and disperse at 600W ultrasonic power for 2h to obtain carbon nanotubes Conductive paste.

[0035] Because layered silicate minerals are widely distributed in nature and low in price, t...

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Abstract

The invention discloses carbon nanotube conductive paste and a preparation method thereof. The conductive paste is composed of the following components in parts by weight: 0.8-6.5 parts of carbon nanotubes, 0.5-2 parts of a layered silicate / nano-silver compound, 0.3-5 parts of a dispersing agent and 86.5-98.4 parts of a solvent. The length of the carbon nanotubes is 10-50 [mu]m, and the diameter of the carbon nanotubes is 5-15 nm. According to the technical scheme, the layered silicate / nano-silver compound is mixed with water to obtain a layered silicate solution; carbon nanotubes are added into the layered silicate solution, and ultrasonic treatment is carried out to disperse the carbon nanotubes; and the carbon nanotubes can be easily dispersed as slurry on the premise of not influencingthe conductivity of the carbon nanotubes.

Description

technical field [0001] The invention relates to the technical field of conductive paste, in particular to a carbon nanotube conductive paste and a preparation method thereof. Background technique [0002] With the increasingly prominent energy and environmental issues, the development of electric vehicles is imperative. Among them, lithium-ion batteries have high energy density and high specific power, and are recognized as the most potential electric vehicle power batteries. However, the anode materials of lithium-ion batteries are generally transition metal oxides or phosphates of transition metals, which have low conductivity and are generally semiconductors or insulators. In order to improve the conductivity of lithium-ion batteries, the charging and discharging efficiency of electrode materials Comprehensive performance, so as to improve the comprehensive performance of battery charging and discharging, the conductive paste must be added in the process of battery prepa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/24H01B13/00H01M4/62H01M10/0525
CPCH01B1/24H01B13/00H01M4/625H01M10/0525Y02E60/10
Inventor 赵起超王蓓陈龙增
Owner 深圳市金百纳纳米科技有限公司