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Preparation method of graphene composite material

A composite material, graphene technology, applied in nanotechnology, structural parts, electrical components and other directions for materials and surface science, can solve the problem of uncontrollable material morphology, thermal conductivity, electrical conductivity, strength, energy density and other properties of composite materials Poor, low graphene yield and other issues

Active Publication Date: 2015-04-29
深圳特新界面科技有限公司
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Problems solved by technology

However, the following disadvantages still exist in the production process: a large number of graphene agglomerates, the yield is low, the shape of the material cannot be adjusted, and the thermal conductivity, electrical conductivity, strength, energy density and other properties of the composite material are poor.

Method used

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Embodiment 1

[0014] Take graphite powder, sodium nitrate and concentrated sulfuric acid and mix them according to a certain volume ratio. Potassium permanganate was first reacted at 10°C for 1.5h, and then reacted at 25°C for 2h to prepare graphene oxide slurry. The aforementioned slurry was washed to neutrality and dried to obtain graphene oxide. The graphene oxide was formulated into 8mg / mL Graphene oxide aqueous solution: Add polyethylene glycol monoperfluorononenyl ether to the above graphene oxide aqueous solution and mix well, then add hydrazine hydrate and stir at 90°C for 3 hours; after the reaction, wash and filter to obtain modified graphene, Dosing 0.25g polyethylene glycol monoperfluorononenyl ether and 4.5g hydrazine hydrate per liter of graphene oxide aqueous solution; adding modified graphene to distilled water for ultrasonic dispersion, ultrasonic power 180W, duration 1.5h, prepared into 45g / The aqueous dispersion of L modified graphene;

[0015] Heat sulfur, lithium sulf...

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Abstract

The invention relates to a preparation method of a graphene composite material. The preparation method comprises the following steps: adding polyethylene glycol monoperfluorononylene ether to prepare modified aqueous dispersion of graphene; preparing a graphene composite film from a sulfur-containing solution and a carbon nano tube; and carrying out gradient crystallization treatment on the graphene composite film. In the technical scheme, the graphene aqueous dispersion is good in stability and high in yield by adding the polyethylene glycol monoperfluorononylene ether; nano sulfur particles are evenly dispersed on the surface of the reduced graphene; full play of high electrical conductivity and stability of the graphene when the graphene composite material is used as a lithium battery anode material is facilitated; the energy density property of the graphene composite material as the anode of the lithium battery is improved; the power characteristics of the battery are improved; and in addition, the heat-conducting property, the conductivity and the strength performance of the graphene composite material can be improved by doping the carbon nano tube.

Description

technical field [0001] The invention relates to the field of new material production, in particular to a method for preparing a graphene composite material. Background technique [0002] Graphene is one of the stiffest materials known, with a Young's modulus of 1TPa, making it an ideal candidate for use as a reinforcement for high-performance composites. Compared with other commonly used secondary batteries, lithium-ion batteries have attracted extensive attention because of their high mass-specific energy and volume-specific energy. The composite material of sulfur and graphene is used to produce lithium positive electrode, which is used to solve the dissolution problem of lithium battery charging and discharging intermediate products and improve the cycle performance of the battery. However, there are still some disadvantages in the production process, such as large agglomeration of graphene, low yield, uncontrollable material morphology, and poor thermal conductivity, el...

Claims

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Application Information

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IPC IPC(8): H01M4/587H01M4/62B82Y30/00
CPCB82Y30/00H01M4/1393H01M4/362H01M4/583Y02E60/10
Inventor 王月兰
Owner 深圳特新界面科技有限公司
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