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Preparation method of aqueous composite carbon nanotube conductive slurry

A carbon nanotube, conductive paste technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of pollution, high cost of carbon nanotube conductive paste, reduce pollution, Low cost and uniform slurry effect

Pending Publication Date: 2020-05-08
哈尔滨万鑫石墨谷科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The invention solves the problems of high cost of carbon nanotube conductive paste produced in factories, water and soil pollution by oil-based solvents, etc. The preparation method has simple process, sufficient raw materials, low cost, is suitable for industrial production, and achieves the preparation of a water system with high cost performance Requirements for the preparation of composite conductive paste, which has better performance as a positive electrode material or negative electrode material for lithium-ion batteries

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Embodiment 1

[0045] This embodiment provides a water-based composite carbon nanotube conductive paste and a preparation method thereof, the method comprising the following steps:

[0046] (1) The powdered multi-walled carbon nanotubes, polyvinylpyrrolidone and water are ball milled in a ball mill, and the powdered multi-walled carbon nanotubes, polyvinylpyrrolidone and water are calculated as 100% by weight, The mass proportion of the dispersant is 4%, the mass proportion of the dispersant is 0.6%, the ball milling frequency is 40HZ, the time is 2h, and the particle size D50 is 10 μm, and then the obtained slurry is put into a sand mill for sand milling. The milling speed is 1500r / min, and the particle size D50 is 3.724μm (see figure 1 ), to obtain carbon nanotube slurry, the slurry solid content is 4.6%;

[0047] (2) Powdery graphite, polyvinylpyrrolidone and water are ball-milled in a ball mill, and the total mass of powdery graphite, polyvinylpyrrolidone and water is 100%, and the mass...

Embodiment 2

[0050] This embodiment provides a water-based composite carbon nanotube conductive paste and a preparation method thereof, the method comprising the following steps:

[0051] (1) The powdered multi-walled carbon nanotubes, polyvinylpyrrolidone and water are ball milled in a ball mill, and the powdered multi-walled carbon nanotubes, polyvinylpyrrolidone and water are calculated as 100% by weight, The mass proportion of the dispersant is 5%, the mass proportion of the dispersant is 1.0%, the ball milling frequency is 50HZ, and the time is 2h, until the particle size D50 is 11.10 μm, and then the obtained slurry is put into a sand mill for sand milling, The sanding speed is 1250r / min, until the particle size D50 is 3.880 μm, and the carbon nanotube slurry is obtained, and the solid content of the slurry is 5.0%;

[0052] (2) Powdery graphite, polyvinylpyrrolidone and water are ball-milled in a ball mill, and the total mass of powdery graphite, polyvinylpyrrolidone and water is 10...

Embodiment 3

[0055] This embodiment provides a water-based composite carbon nanotube conductive paste and a preparation method thereof, the method comprising the following steps:

[0056] (1) The powdered multi-walled carbon nanotubes, polyvinylpyrrolidone and water are ball milled in a ball mill, and the powdered multi-walled carbon nanotubes, polyvinylpyrrolidone and water are calculated as 100% by weight, The mass proportion of the dispersant is 3.3%, the mass proportion of the dispersant is 1.2%, the ball mill frequency is 45HZ, the time is 1.5h, and the particle size D50 is 12.01 μm, and then the obtained slurry is put into a sand mill for sand milling , the sand milling speed is 1800r / min, until the particle size D50 is 4.09 μm, the carbon nanotube slurry is obtained, and the solid content of the slurry is 4.2%;

[0057] (2) Powdery graphite, polyvinylpyrrolidone and water are ball-milled in a ball mill, and the total mass of powdery graphite, polyvinylpyrrolidone and water is 100%, ...

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Abstract

The invention discloses a preparation method of aqueous composite carbon nanotube conductive slurry. The preparation method comprises the following steps: (1) carrying out ball milling on powdered carbon nanotubes, a dispersing agent and a water-based solvent in a ball mill until the particle size D50 is 10-15 microns, and then putting the obtained slurry into a sand mill for sand milling until the particle size D50 is 3.5-4 microns to obtain carbon nanotube slurry; 2) carrying out ball milling on powdered graphite, a dispersant and an aqueous solvent in a ball mill until the particle size D50is less than 50 microns, and putting the obtained slurry into a grinding device for treatment until the particle size D50 is less than 2 microns to obtain graphene slurry; 3) carrying out high-speedstirring on the carbon nanotube slurry and the graphene slurry to obtain the aqueous composite carbon nanotube conductive slurry. The preparation method solves the problems of high cost of carbon nanotube conductive slurry produced in factories, water and soil pollution caused by oil solvents and the like, and is simple in process, sufficient in raw materials, low in cost and suitable for industrial production.

Description

technical field [0001] The invention belongs to the field of preparation methods and applications of composite materials, and relates to a preparation method of water-based composite carbon nanotube conductive paste. Background technique [0002] With the development of industrial technology, new environmentally friendly energy materials have attracted more and more attention. Lithium-ion batteries, as the current green energy, have been widely used in mobile phone batteries because of their high capacity, light weight, safety, and long cycle life. New energy vehicles, computers, small and medium energy storage systems and other fields. Adding carbon nanotubes to lithium-ion batteries can increase their cycle life and effectively improve battery performance. Carbon nanotubes have the following advantages: (1) Carbon nanotubes have good electronic conductivity, and the fibrous structure can form a continuous conductive network in the electrode active material; (2) After addi...

Claims

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Application Information

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IPC IPC(8): H01M4/62B82Y40/00B82Y30/00
CPCH01M4/625B82Y30/00B82Y40/00Y02E60/10
Inventor 姜鹏何斌冯晓彤张广明马洪伟张荻霍美婷刘博宇
Owner 哈尔滨万鑫石墨谷科技有限公司
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