Graphene physical stripping production method and graphene produced through method

A technology of physical exfoliation and production methods, applied in the field of graphene, can solve the problems of unfavorable graphene popularization, high production cost, high production difficulty, etc., and achieve the effects of low production cost, long service life and good fluidity

Pending Publication Date: 2018-04-20
李文辉
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] But the method that prior art can industrialized production mainly still realizes by CVD (chemical vapor deposition method), by chemical vapor deposition method, can make the few-layer graphene film of large area, continuous, transparent, high conductivity, mainly It is used in the anode of photovoltaic devices, and the energy conversion efficiency is as high as 1.71%. Compared with the components made of indium tin oxide materials, it is about 55.2% of its energy conversion efficiency. The disadvantage is that the production is difficult and the production cost is high. It is difficult to make graphene widely used, and it is of revolutionary significance to study the low-cost physical method to produce graphene
[0004] Graphene is obtained by repeated sticking and tearing with tape, from the friction method to the CVD method, all of which have either low efficiency or high production costs, which is not conducive to the popularization of graphene applications.

Method used

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  • Graphene physical stripping production method and graphene produced through method
  • Graphene physical stripping production method and graphene produced through method
  • Graphene physical stripping production method and graphene produced through method

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Experimental program
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Effect test

Embodiment 1

[0025] The average particle size D50 is 6-8 μm, D10099.5% flake graphite, spherical zinc-magnesium alloy powder from 9 μm-11 μm (in zinc-magnesium alloy, zinc content 70wt%, magnesium content 30wt%) Add the ball milling medium composed of stainless steel balls with a diameter of 0.6mm-0.8mm into the ball mill. The weight ratio of stainless steel balls and zinc-magnesium alloy powder is shown in Table 1 below. The sum of the ball and the zinc-magnesium alloy powder) is 4.5%, the speed of the ball mill is 50-55 rpm, the temperature is 120-150°C, the ball mill stripping is carried out in a nitrogen atmosphere with an oxygen content of less than 0.8%, and the nitrogen pressure is 6-10kPa , The ball milling stripping time is 200-300 hours. After the ball milling stripping, the graphene flakes after ball milling stripping are separated by airflow classification under the protection of inert gas, and then accurately classified by airflow for many times. The classification system is a ...

Embodiment 2

[0030] Exfoliate flake graphite with average particle size D50 of 6-8μm, D10099.5%, spherical zinc-magnesium alloy powder of 9μm-11μm and stainless steel ball with diameter of 0.6mm-0.8mm The medium is added into the ball mill, wherein relative to the total weight of the ball milling medium, the weight of the steel ball is 20%, the weight of the zinc-magnesium alloy powder is 80%, and the ratio of zinc and magnesium in the zinc-magnesium alloy powder is: the mass ratio of zinc is 70%, The mass ratio of magnesium is 30%.

[0031] The weight of flaky graphite and the weight ratio of ball milling exfoliation medium (the sum of steel ball and zinc-magnesium alloy powder) are as shown in Table 2. The rotating speed of ball mill is 50-55 rev / min, temperature 120-150 ℃, ball mill exfoliation is in atmospheric oxygen It is carried out in a nitrogen atmosphere with a content of less than 0.8%, the nitrogen pressure is 6-10kPa, and the ball milling stripping time is 200-300 hours. After...

Embodiment 3

[0036]The ball milling medium consists of flake graphite with an average particle size D50 of 6-8 μm, D10099.5%, spherical zinc-magnesium alloy powder of 9 μm-11 μm and stainless steel balls with a diameter of 0.6mm-0.8mm Add it into the ball mill, wherein, relative to the total weight of the ball milling medium, the weight of the steel ball is 20%, the weight of the zinc-magnesium alloy powder is 80%, and the mass ratio of zinc and magnesium in the zinc-magnesium alloy powder is shown in Table 3 below. The weight of the graphite is about 4.5% of the ball milling exfoliation medium (the sum of steel balls and zinc-magnesium alloy powder), the speed of the ball mill is 50-55 rpm, and the temperature is 120-150°C. % nitrogen atmosphere, the nitrogen pressure is 6-10kPa, the ball milling stripping time is 200-300 hours, after the ball milling stripping is completed, the graphene flakes after the ball milling stripping are separated by airflow classification under the protection of...

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Abstract

The invention provides a production method of graphene physical exfoliation and graphene produced by the method. The method comprises using high-purity flake graphite as a raw material for producing graphene, using steel balls and zinc-magnesium alloy powder as a ball milling exfoliation medium, Put the flake graphite and the ball milling exfoliation medium into the ball mill, and perform the ball milling exfoliation under the protection of nitrogen. After the exfoliation, the graphene flakes after ball milling and exfoliation are separated by airflow classification under the protection of inert gas. The whole production process is easy to operate and produces no pollutants.

Description

technical field [0001] The invention relates to a production method of graphene physical exfoliation and graphene produced by the method. Background technique [0002] Graphene is a two-dimensional crystal, which is composed of carbon atoms arranged in a hexagonal shape and connected to each other to form a carbon molecule with a very stable structure; as the number of connected carbon atoms continues to increase, this two-dimensional carbon molecule The plane keeps expanding, and the molecules keep getting bigger. Single-layer graphene is only as thick as one carbon atom, that is, 0.335 nanometers, which is equivalent to 1 / 200,000th the thickness of a hair. There are nearly 1.5 million layers of graphene in graphite with a thickness of 1 mm. Graphene is the thinnest material known, and has the advantages of extremely high specific surface area, super-strong electrical conductivity and strength. The existence of the above advantages means that it has a good market prospect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B02C17/10B02C17/18B02C23/06C01B32/19
CPCB02C17/10B02C17/18B02C23/06C01B2204/04C01B2204/32
Inventor 李文辉
Owner 李文辉
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