Full-solid preparation method of graphene uniformly coated on surface of irregular micro-nanoparticles

A technology with micro-nano particles and uniform surface, applied in the field of new energy material preparation, can solve the problems such as the inability to distribute graphene evenly, performance loss, size limitation, etc., and achieve the effects of low cost, small investment and high production efficiency

Active Publication Date: 2019-01-25
西安一九零八新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There are also people who add PVP, PVAc, PVP/PVAc to the water/DMF dispersion of graphene oxide, and prepare graphene/polymer doped materials by heating reduction, but the polymer matrix material will be degraded after high temperature treatment, resulting in loss of performance
Moreover, the coating of graphene in the materials prepared by the above methods cannot be evenly distributed, and there are a large amount of free graphene, which poses great challenges to subsequent processing.
[0005] Solid phase compounding can avoid the deterioration of the above materials, but the traditional solid state compounding is often just a si

Method used

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  • Full-solid preparation method of graphene uniformly coated on surface of irregular micro-nanoparticles
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  • Full-solid preparation method of graphene uniformly coated on surface of irregular micro-nanoparticles

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preparation example Construction

[0037] An all-solid-state preparation method for uniformly coating graphene on the surface of irregular micro-nano particles, comprising the following steps:

[0038] Step 1, preparing graphene-coated microsphere shell-core structure;

[0039] Step 2, transfer of the graphene-coated microsphere shell-core structure to the surface of the irregular micro-nano particles to form graphene-coated irregular micro-nano particles.

[0040] Step 1 specifically includes the following steps:

[0041] 1) mixing flake graphite powder and coated hard microspheres to obtain mixture A;

[0042] 2) Put the mixture A into the agate ball mill jar, during the ball milling process, the graphite flakes rub against the microspheres, and the graphene with different thicknesses is transferred and coated on the surface of the hard microspheres to obtain the mixture B;

[0043] 3) The graphite powder in the mixture B is sieved out to obtain a microsphere shell-core structure C coated with graphene of d...

Embodiment 1

[0068] a) Weigh 30 g of flake graphite (16 mesh, carbon content ≥ 99%), and 60 g of copper balls (diameter 400 μm) and mix evenly;

[0069] b) Put the above mixture into an agate ball mill jar, and mix it with a ball mill in an air atmosphere, set the rotation speed to 250rpm, and mill for 10 hours;

[0070] c) sieve out residual flake graphite in b) the resulting mixture (the aperture of the sieve is 0.03mm), leaving copper balls coated with graphene of different thicknesses;

[0071] d) Place the coated copper balls obtained in c) in a clean agate ball mill jar, add 120 g of clean copper balls of the same specification (400 μm in diameter) and mix evenly;

[0072] e) Set the ball milling parameters to a rotating speed of 250 rpm and a time of 12 hours to obtain a uniform thin-layer graphene-coated copper ball product.

Embodiment 2

[0074] a) Weigh 50g of the obtained graphene-copper spherical shell-core coating sample in Example 1 and place it in a stainless steel ball mill jar;

[0075] b) In a glove box (inert atmosphere), add 2 g of lithium aluminum hydride powder into the ball milling jar, seal the ball milling jar, and fill the jar with argon. Set the ball milling parameters as a rotating speed of 450rpm and a time of 12h;

[0076] c) Sieve the mixture obtained in b) in a glove box (the sieve aperture is 0.02 mm), remove the copper balls, and obtain a graphene-coated lithium aluminum hydride composite.

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Abstract

The invention discloses an all-solid-state material preparation method for uniformly coating dense graphene on the surface of irregular micro-nano particles, belonging to the technical field of new energy materials and preparation thereof. The graphite powder layers are separated from each other and adhered to the surface of the coated microspheres during the friction process by the shear force generated during the ball milling process, and the graphite layers are continuously thinned under the continuous physical friction, and finally the thin graphene coated microspheres shell is formed. Thesize difference between the coated product and graphite powder was used to screen the coated product. Furthermore, the transfer graphene can be obtained by mixing the microsphere-coated product withother irregular nanoparticle solid powder samples to form grapheme-Solid powder composites for use in various fields. The whole process does not involve any chemical reaction, simple process, low cost, green environmental protection, high product purity and simple post-treatment, raw materials can be used repeatedly, suitable for industrial production.

Description

technical field [0001] The invention belongs to the technical field of preparation of new energy materials, in particular to an all-solid-state preparation method for uniformly coating graphene on the surface of irregular micro-nano particles. Background technique [0002] Since 2004, physicists Andre Geim and Konstantin Novoselov of the University of Manchester successfully separated graphene from graphite by micromechanical exfoliation, due to its high strength, low density and high conductivity , high thermal conductivity, high stability, anti-corrosion, anti-wear and other excellent properties are favored by all walks of life. Graphene is used as a conductive, thermally conductive framework, and anti-corrosion medium to compound various materials to improve the performance of the material and expand the scope of use of the material. [0003] There are four types of graphene composite structures: (a) graphene-supported composites; (b) graphene-coated composites; (c) grap...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/583H01M4/48H01M10/052H01G11/32H01G11/46C01B32/19C01B3/02B82Y30/00
CPCB82Y30/00C01B3/02C01B32/19H01G11/32H01G11/46H01M4/366H01M4/48H01M4/583H01M10/052Y02E60/10
Inventor 张锦英杨娜赵雪雯傅成程黄家良成永红
Owner 西安一九零八新能源科技有限公司
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