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Carbon nanotube conductive slurry and preparation method and application thereof

A carbon nanotube, conductive paste technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the influence of conductive paste conductivity, carbon nanotube structure damage, carbon tube damage problems such as large degree of dispersion, to achieve good dispersion effect, improve electrical conductivity, and ensure the effect of dispersion degree

Active Publication Date: 2019-08-02
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

However, the high-pressure dispersing device described in this method has a greater degree of damage to the carbon tubes, and the structural damage of the carbon nanotubes under high pressure is more serious, which has a certain impact on the conductivity of the conductive paste.

Method used

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  • Carbon nanotube conductive slurry and preparation method and application thereof

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Embodiment 1

[0060] This embodiment provides a method for preparing a carbon nanotube conductive paste, the preparation method comprising the following steps:

[0061] (1) Mix carboxymethyl cellulose and N-methylpyrrolidone at a mass ratio of 1:95, carry out vacuum dispersion at an absolute pressure of 0.01MPa, with a rotation speed of 1200r / min, a flow rate of 400L / min, a time of 40min, and a low temperature At 70°C, a mixed solution was obtained;

[0062] (2) Under the absolute pressure of 0.01MPa, the pipe diameter is 5-15nm and the specific surface area is 300m 2 After the carbon nanotube of / g is dispersed into mist, add in the mixed solution of step (1) gained, mixed solution circulates, and flow rate is 400L / min, and the mass ratio of carbon nanotube and mixed solution is 1:24, carries out centrifugal dispersion, The rotation speed is 1600r / min, the time is 60min, and the temperature is not higher than 70°C to obtain a mixed slurry;

[0063] (3) In the mixed slurry obtained in ste...

Embodiment 2

[0065] This embodiment provides a method for preparing a carbon nanotube conductive paste, the preparation method comprising the following steps:

[0066] (1) Mix polyvinylpyrrolidone and N-methylpyrrolidone at a mass ratio of 1:94, and carry out vacuum dispersion at an absolute pressure of 0.012MPa, with a rotation speed of 1500r / min, a flow rate of 600L / min, a time of 60min, and a temperature not exceeding 70°C , to obtain a mixed solution;

[0067] (2) Under the absolute pressure of 0.012MPa, the pipe diameter is 5-15nm and the specific surface area is 300m 2 After the carbon nanotube of / g is dispersed into mist, add in the mixed solution of step (1) gained, mixed solution circulates, and flow rate is 600L / min, and the mass ratio of carbon nanotube and mixed solution is 1:20, carries out centrifugal dispersion, The rotation speed is 1800r / min, the time is 70min, and the temperature does not exceed 70°C to obtain a mixed slurry;

[0068] (3) In the mixed slurry obtained i...

Embodiment 3

[0070] This embodiment provides a method for preparing a carbon nanotube conductive paste, the preparation method comprising the following steps:

[0071] (1) Mix carboxymethyl cellulose and N-cyclohexanepyrrolidone according to the mass ratio of 1:96, carry out vacuum dispersion under the absolute pressure of 0.015MPa, the rotation speed is 1000r / min, the flow rate is 200L / min, the time is 15min, and the temperature is constant Over 70°C, a mixed solution is obtained;

[0072] (2) Under the absolute pressure of 0.015MPa, the pipe diameter is 5-15nm and the specific surface area is 300m 2 After the carbon nanotube of / g is dispersed into mist, add in the mixed solution of step (1) gained, mixed solution circulates, and flow rate is 200L / min, and the mass ratio of carbon nanotube and mixed solution is 1:30, carries out centrifugal dispersion, The rotation speed is 1200r / min, the time is 50min, and the temperature does not exceed 70°C to obtain a mixed slurry;

[0073] (3) In ...

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Abstract

The invention relates to carbon nanotube conductive slurry and a preparation method and an application thereof. The preparation method comprises the steps of (1) mixing a surfactant and a solvent, andcarrying out preliminary pre-mixing dispersion to obtain a mixed solution; (2) adding nanotubes into the mixed solution obtained in the step (1) under a vacuum condition, and carrying out deep pre-mixing dispersion to obtain mixed slurry; and (3) carry out high-speed centrifugal dispersion on the mixed slurry obtained in the step (2) to obtain the carbon nanotube conductive slurry. Through the mutual cooperation of preliminary pre-mixing dispersion, deep pre-mixing dispersion and high-speed centrifugal dispersion, the dispersion effect of the carbon nanotubes is improved, and the viscosity ofthe conductive slurry is reduced, thereby improving the conductivity of the conductive slurry, and being conducive to the subsequent application of the conductive slurry. In addition, the conductiveslurry prepared according to the preparation method provided by the invention has the advantages of low viscosity, high solid content and excellent conductivity.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and relates to a conductive paste for lithium-ion batteries and a preparation method and use thereof, in particular to a carbon nanotube conductive paste and a preparation method and use thereof. Background technique [0002] Lithium-ion batteries have the characteristics of high specific energy, high specific power, long service life, and wide operating range. Lithium-ion batteries include positive electrode materials, negative electrode materials, separators, and electrolytes. Conductive paste is an important part of positive electrode materials. , The conductive paste has an important influence on the cycle performance, capacity and rate performance of the battery. Commonly used conductive agents in conductive pastes are granular conductive agents, such as acetylene black, carbon black, artificial graphite and natural graphite, etc.; fibrous conductive agents such as metal fibers...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/36H01M10/0525H01M4/13B82Y30/00
CPCH01M4/364H01M4/625H01M4/13H01M10/0525B82Y30/00H01M2004/028H01M2004/021Y02E60/10
Inventor 冯晓彤何斌杜新伟张广明贾玉成
Owner 哈尔滨万鑫石墨谷科技有限公司
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