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Preparation method of high-purity graphene-CNT (carbon nano tube) composite powder

A nanotube composite, high-purity graphite technology, applied in the field of nanostructure production, can solve the problems of self-discharge of lithium batteries, affecting the safety and service life of lithium batteries, and achieve the effect of improving electrical conductivity and increasing rate cycle life.

Inactive Publication Date: 2018-04-13
SHENZHEN GUOCHUANG JIAWEI GRAPHENE TECH CO LTD
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

As a metal catalyst as a magnetic substance, when used in a lithium battery, it will cause the self-discharge phenomenon of the lithium battery, thereby affecting the safety and service life of the lithium battery

Method used

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  • Preparation method of high-purity graphene-CNT (carbon nano tube) composite powder
  • Preparation method of high-purity graphene-CNT (carbon nano tube) composite powder

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Embodiment Construction

[0023] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0024] The present invention proposes a method for preparing high-purity graphene and carbon nanotube composite powder in one step using an explosive reaction method, that is, the chlorosulfonic acid method for preparing high-purity graphene / carbon nanotube composite powder. This method can prepare high-quality graphene and remove the metal catalyst in the carbon nanotubes at the same time, which not only avoids the pollution of the environment caused by acid gas and the waste of lye, but also avoids the waste of heat, and realizes the use of the reaction to the reaction liquid itself. Heating is performed to prepare high-purity graphene / carbon nanotube composite powder with a purity of more than 99.5% in one step.

[0025] The specific method is as follows: firstly mix graphite powder and carbon nanotubes in solid state, then inject a certain amount of chlorosulfoni...

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Abstract

The invention provides a preparation method of a high-purity graphene-CNT (carbon nano tube) composite powder. The preparation method comprises the following steps: Step 1: performing solid phase mixing on a graphite powder and a CNT and prepare a chlorosulfonic acid liquid at a mass ratio of graphite and chlorosulfonic acid of 1-25 to 1-300; Step 2: injecting a certain amount of the chlorosulfonic acid liquid into a pressure reaction kettle, opening the reaction kettle, stirring the mixture so that the graphite powder and the chlorosulfonic acid liquid are uniformly mixed and fully infiltrated, and dropping a H2O2 solution into the mixture; Step 3: performing a reaction on H2O2 and the chlorosulfonic acid to generate a large number of gas in an instant, inserting the gas between graphitelayers in a wedge form, and forming a breaking point with the increase of the quantity of the gas, so that the graphite is peeled off quickly, so as to obtain the graphene; Step 4: rapidly releasing released gas and conveying acid gas generated by a reflux condenser into the reaction kettle device again.

Description

technical field [0001] The invention relates to a method for making a nanostructure, in particular to a method for making a graphene carbon nanotube composite powder. Background technique [0002] In the preparation methods of graphene, there are mainly the following conventional methods: redox method, liquid phase mechanical stripping method, chemical vapor deposition method, etc. Another document reports that graphene can be exfoliated by using a composite system of superacid chlorosulfonic acid and hydrogen peroxide. The whole reaction is explosive, and chlorosulfonic acid reacts violently with water, and the resulting gas explosion rapidly exfoliates graphite to form graphene. . However, when this method prepares graphene, a large amount of strong acidic toxic gases are produced, such as HCl, SO2, etc., and the general method is to absorb and neutralize these acid gases through alkaline recovery liquid, which consumes lye on the one hand, and causes waste of acid gas. ...

Claims

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Application Information

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IPC IPC(8): C01B32/19C01B32/168H01M4/62
CPCH01M4/625Y02E60/10
Inventor 王东卫丁显波
Owner SHENZHEN GUOCHUANG JIAWEI GRAPHENE TECH CO LTD