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Method for purifying carbon nanotubes and method for preparing carbon nanotube slurry

A carbon nanotube and purification method technology, applied in the directions of carbon nanotubes, nanocarbons, structural parts, etc., can solve the problems of small removal effect of metal impurities, long reaction time, complicated process, etc. Low pollution and high purification efficiency

Pending Publication Date: 2022-06-07
诺瑞(深圳)新技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When treated with acid, only the metal impurities exposed on the surface of the carbon nanotubes can be removed, and the removal effect on the metal impurities inside the ports and cavities of the carbon nanotubes is very small, and the purification effect is limited. At the same time, there will be waste acid pollution and waste acid pollution. Dealing with problems; when using complexation reaction, although this method will not cause damage to the structure of carbon nanotubes, the cost of complexing agent is high, and the process is complicated, which is not suitable for industrial mass production; it can also be purified by high temperature vacuum, but the energy consumption High, the response time is long, and it cannot run continuously, which has great limitations

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  • Method for purifying carbon nanotubes and method for preparing carbon nanotube slurry
  • Method for purifying carbon nanotubes and method for preparing carbon nanotube slurry

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Effect test

Embodiment 1

[0038] The present embodiment provides a method for purifying carbon nanotubes, comprising the following steps:

[0039] (1) Put the original carbon nanotube powder into a twin-screw extruder, compress and granulate, and the size of the compressed carbon nanotube particles is: length 5mm, diameter 5mm.

[0040] (2) Take 50g of compressed carbon nanotube particles and put them on the high-temperature non-metallic filter element of the high-temperature furnace in the vertical quartz reactor, connect the chlorine gas cylinder and the nitrogen gas cylinder, and feed 1000sccm from the bottom of the quartz reactor. N 2 , hold for 15min to exhaust the air in the device. Then the temperature of the high-temperature furnace was raised from room temperature to 1000°C, and 500sccm Cl was introduced at this time. 2 , hold for 120 min, then turn off Cl 2 , lower the temperature of the high temperature furnace to room temperature. Among them, in the whole process of purification, 1000 scc...

Embodiment 2

[0044] The present embodiment provides a method for purifying carbon nanotubes, comprising the following steps:

[0045] (1) Put the original carbon nanotube powder into a twin-screw extruder, compress and granulate, and the size of the compressed carbon nanotube particles is: length 5mm, diameter 5mm.

[0046] (2) Take 50g of compressed carbon nanotube particles and put them on the high-temperature non-metallic filter element of the high-temperature furnace in the vertical quartz reactor, connect the chlorine gas cylinder and the nitrogen gas cylinder, and feed 1000sccm from the bottom of the quartz reactor. N 2 , hold for 15min to exhaust the air in the device. Then the temperature of the high-temperature furnace was raised from room temperature to 1000°C, and 200sccm Cl was introduced at this time. 2 , hold for 120 min, then turn off Cl 2 , lower the temperature of the high temperature furnace to room temperature. Among them, in the whole process of purification, 1000 s...

Embodiment 3

[0050] The present embodiment provides a method for purifying carbon nanotubes, comprising the following steps:

[0051] (1) Put the original carbon nanotube powder into a twin-screw extruder, compress and granulate, and the size of the compressed carbon nanotube particles is: length 5mm, diameter 5mm.

[0052] (2) Take 50g of compressed carbon nanotube particles and put them on the high-temperature non-metallic filter element of the high-temperature furnace in the vertical quartz reactor, connect the chlorine gas cylinder and the nitrogen gas cylinder, and feed 1000sccm from the bottom of the quartz reactor. N 2 , hold for 15min to exhaust the air in the device. Then the temperature of the high-temperature furnace was raised from room temperature to 1000°C, and 800sccm Cl was introduced at this time. 2 , keep for 120min, then turn off Cl 2 , lower the temperature of the high temperature furnace to room temperature. Among them, in the whole process of purification, always ...

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Abstract

The invention discloses a purification method of a carbon nano tube and a preparation method of carbon nano tube slurry. On the first aspect, the invention provides a purification method of the carbon nano tube, and the purification method comprises the following steps: at the temperature of 950-1050 DEG C, the carbon nano tube and chlorine are subjected to a contact reaction. The purification method provided by the embodiment of the invention at least has the following beneficial effects that the temperature of the reaction environment is directly increased to 950-1050 DEG C before purification, under the condition, the reaction of metal impurities in the carbon nanotubes and chlorine and the discharge of low-boiling-point metal chlorides after the reaction are carried out at the same time, the purification effect is greatly improved, and the method is suitable for industrial production. The highest purity of the carbon nanotubes can reach 99.999 +%, compared with an existing purification method, the purification efficiency is higher, the cost is lower, operation is easy and convenient, and continuous operation can be achieved.

Description

technical field [0001] The present application relates to the technical field of carbon nanotubes, in particular to a method for purifying carbon nanotubes and a method for preparing carbon nanotube slurry. Background technique [0002] In recent years, people's demand for lithium-ion batteries is increasing, especially for high-power, high-energy density lithium-ion batteries. Compared with traditional conductive agents such as Super P and graphite, carbon nanotubes have the advantages of ultra-high aspect ratio and high conductivity. Only a very small amount of addition can be used to form an efficient three-dimensional high-conductivity network in the electrode to improve the battery. purpose of energy density. Carbon nanotubes have been recognized as the best conductive agent for improving the high rate and long cycle performance of Li-ion batteries. However, in the preparation process of carbon nanotubes, excessive metal impurities are often left, and there are safety...

Claims

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Application Information

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IPC IPC(8): C01B32/17H01M4/62
CPCC01B32/17H01M4/62H01M4/625Y02E60/10
Inventor 张新杰鲜丰莲
Owner 诺瑞(深圳)新技术有限公司
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