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High-dispersity carbon nanotube, preparation method thereof and secondary battery

A technology of carbon nanotubes and high dispersibility, which is applied in the field of carbon nanotubes with high dispersibility and its preparation, can solve the problems of poor dispersibility and stability of carbon nanotubes, high cost, unfriendly environment, etc., and achieves excellent electrical conductivity. Effect

Active Publication Date: 2022-07-26
广东一纳科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 1. N-methylpyrrolidone (NMP) organic solvents are generally used as solvents for conductive pastes, which are costly and environmentally unfriendly;
[0006] 2. If the solvent of the conductive paste uses deionized water, the dispersion and stability of carbon nanotubes in the conductive paste are poor

Method used

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  • High-dispersity carbon nanotube, preparation method thereof and secondary battery
  • High-dispersity carbon nanotube, preparation method thereof and secondary battery
  • High-dispersity carbon nanotube, preparation method thereof and secondary battery

Examples

Experimental program
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Effect test

Embodiment 1

[0091] Weigh 1g of single-walled carbon nanotubes, 30g of multi-walled carbon nanotubes, 2g of polyvinylpyrrolidone, 1g of cetyltrimethylammonium bromide and 495g of deionized water, and then place the above components in Mix well in a beaker to form a premix slurry. Then, the premixed slurry was poured into the feed cup of the high-pressure homogenizer, and the slurry was homogenized and dispersed at a pressure of 800 bar. The particle size of the slurry was D50<20 μm. The slurry was spray-dried at a feed temperature of 210°C and a discharge temperature of 130°C to obtain black powder. The powder was placed in a tube furnace, and nitrogen was passed through. The heating rate of the tube furnace was controlled at 10°C / min, the temperature was raised to 500°C, and the temperature was lowered to normal temperature after holding for 6 hours. The inert gas was stopped, and the black powder was taken out. Carbon nanotubes with high dispersibility are obtained.

Embodiment 2

[0093] Weigh 1g of single-walled carbon nanotubes, 50g of multi-walled carbon nanotubes, 1g of polyvinylpyrrolidone, 3g of octadecyltrimethylammonium chloride and 479g of deionized water, and then place the above components in Mix well in a beaker to form a premix slurry. Then, the premixed slurry was poured into the feed cup of the high-pressure homogenizer, and the slurry was homogenized and dispersed at a pressure of 800 bar. The particle size of the slurry was D50<20 μm. The slurry was spray-dried at a feed temperature of 210°C and a discharge temperature of 130°C to obtain black powder. The powder was placed in a tube furnace, passed nitrogen, the heating rate of the tube furnace was controlled at 10°C / min, the temperature was raised to 600°C, and the temperature was lowered to normal temperature after holding for 8 hours, the inert gas was stopped, and the black powder was taken out. Carbon nanotubes with high dispersibility are obtained.

Embodiment 3

[0095] Weigh 1 g of single-walled carbon nanotubes, 40 g of multi-walled carbon nanotubes, 4 g of polyvinyl alcohol, 3 g of cetyltrimethylammonium chloride and 473 g of deionized water, and then place the above components in a Mix well in a beaker to form a premix slurry. Then, the premixed slurry was poured into the feed cup of the high-pressure homogenizer, and the slurry was homogenized and dispersed at a pressure of 800 bar. The particle size of the slurry was D50<20 μm. The slurry was spray-dried at a feed temperature of 210°C and a discharge temperature of 130°C to obtain black powder. The powder was placed in a tube furnace, and nitrogen was passed through. The heating rate of the tube furnace was controlled at 10°C / min, the temperature was raised to 500°C, and the temperature was lowered to normal temperature after holding for 7 hours. The inert gas was stopped, and the black powder was taken out. Carbon nanotubes with high dispersibility are obtained.

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Abstract

The invention relates to a high-dispersity carbon nano tube which meets the following conditions (1), (2) and (3): (1) the high-dispersity carbon nano tube comprises a single-walled carbon nano tube and a multi-walled carbon nano tube, and the mass ratio of the single-walled carbon nano tube to the multi-walled carbon nano tube is 1: (30-50); (2) the average outer diameter of the multi-walled carbon nanotubes is 40 nm or less, and the standard deviation of the outer diameter of the multi-walled carbon nanotubes is 4 nm or less; and (3) the length-diameter ratio of the multi-walled carbon nanotube is not less than 2000. The invention also relates to a method for preparing the high-dispersity carbon nanotube. The invention also relates to a secondary battery, the secondary battery comprises a positive pole piece and a negative pole piece, and both the positive pole piece and the negative pole piece contain the high-dispersity carbon nanotube.

Description

technical field [0001] The invention relates to a carbon nanotube with high dispersibility and a preparation method thereof. More specifically, it relates to a carbon nanotube with high dispersibility, and a secondary battery using the carbon nanotube with high dispersibility. Background technique [0002] Carbon nanotubes are cylindrical carbon materials with an outer diameter of several nanometers to several tens of nanometers. Carbon nanotubes have high electrical conductivity and mechanical strength. Therefore, carbon nanotubes are used as functional materials in a wide range of fields including electronic engineering and energy engineering. Examples of functional materials include fuel cells, electrodes, electromagnetic wave shielding materials, conductive resins, members for Field Emission Displays (FEDs), absorbing materials for various gases including hydrogen, and the like. [0003] As a development example of the functional material, carbon nanotubes can be used...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/168H01M4/62H01M10/0525
CPCC01B32/168H01M4/625H01M10/0525Y02E60/10
Inventor 王建兴曹礼洪方波谢冬冬肖敏
Owner 广东一纳科技有限公司
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