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A kind of preparation method of graphene powder and supercapacitor

A graphene powder and graphene technology, applied in graphene, hybrid capacitor electrodes, nano-carbon, etc., can solve the problems of high equipment requirements, reduced graphene powder density, low powder density, etc., and achieve control of powder accumulation The effect of density, increased contact surface, and rapid heat transfer

Active Publication Date: 2019-06-28
NINGBO GRAPHENE INNOVATION CENT CO LTD
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these methods easily lead to a reduction in the density of graphene powders, which makes the bulk density of the final powder material too low, which greatly affects its application in electrode materials for electrochemical energy storage devices.
The preparation of graphene powder by the spray drying method disclosed by Zangmeister et al. (Nano Lett.2012, 12, 486-489) has high requirements for equipment, and the prepared powder has a low density, which cannot meet the needs of high-volume capacity supercapacitors. requirements

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  • A kind of preparation method of graphene powder and supercapacitor
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  • A kind of preparation method of graphene powder and supercapacitor

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preparation example Construction

[0046] The invention provides a kind of preparation method of graphene powder, comprises the following steps:

[0047] 1) After mixing the graphene oxide aqueous solution, medium and emulsifier, obtain the graphene oxide emulsion;

[0048] 2) after reacting the graphene oxide emulsion obtained in the above steps with a reducing agent, obtain a partially reduced graphene oxide emulsion;

[0049] 3) adding the partially reduced graphene oxide emulsion obtained in the above steps into a hot medium to obtain a turbid solution;

[0050] 4) The turbid liquid obtained in the above steps is subjected to solid-liquid separation, and then heat-treated to obtain graphene powder.

[0051] In the present invention, firstly, the graphene oxide aqueous solution, the medium and the emulsifier are mixed to obtain the graphene oxide emulsion, that is, the mixed solution of the graphene oxide emulsion and the medium.

[0052] The present invention has no special limitation on the graphene oxide ...

Embodiment 1

[0095] The mass ratio of the graphene oxide to the emulsifier is 1:0.007. The mixed emulsion was stirred under a high-shear homogeneous emulsifier for 30 minutes to obtain a uniformly mixed graphene oxide water-in-oil structure emulsion.

[0096] Configure 2mg / ml graphene oxide aqueous solution, with a volume ratio of 1:2, add 100ml of silicone oil to 50ml of graphene oxide solution and mix, then according to the mass ratio of graphene oxide and emulsifier is 1:0.007 ratio, Add emulsifier Hypermer 2296 and stir at high speed to make it fully mixed to obtain graphene oxide emulsion.

[0097] The above mixed solution of graphene oxide emulsion and silicone oil was placed in a beaker, and 50% hydrazine hydrate was added at 25°C at a mass ratio of 1:15 to mix and react for 1 hour to form a partially reduced graphene oxide water-in-oil emulsion. The XPS test ensures that the carbon-to-oxygen ratio is maintained at 3.3:1.

[0098] The emulsion of the partially reduced graphene oxi...

Embodiment 2

[0115] Configure 2mg / ml graphene oxide aqueous solution, add 100ml of silicone oil to 50ml of graphene oxide solution, then add emulsifier Hypermer 2524 and stir at a high speed according to the ratio of graphene oxide to emulsifier mass ratio of 1:0.003 Mix well; place the mixed solution of graphene oxide and silicone oil in a beaker, add 50% hydrazine hydrate at 25°C to mix and react for 1 hour at a mass ratio of 1:10, and ensure that the carbon-oxygen ratio is maintained at 4 by XPS test :1. Then it is added to the high-temperature silicone oil stirred at 175°C to quickly evaporate the water, so that the graphene powder particles shrink rapidly, fix the spherical shape of the powder particles and increase the degree of densification.

[0116] Utilize scanning electron microscope to analyze the graphene powder particle that obtains in embodiment 2 and know, the size of the graphene powder particle that obtains in embodiment 1 is 20~30 μ m, and the powder body tap density tha...

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Abstract

The invention provides a preparation method of graphene powder. The preparation method comprises the following steps: firstly mixing a graphene oxide water solution, a medium and an emulgator to obtain graphene oxide emulsion; then reacting the graphene oxide emulsion obtained by the previous step and a reducer, so as to obtain the partially reduced graphene oxide emulsion; afterwards, adding the partially reduced graphene oxide emulsion obtained by the previous step into a hot medium, so as to obtain a turbid solution; finally, performing solid-liquid separation on the turbid solution obtained by the previous step, and performing thermal treatment to obtain the graphene powder. The emulsion of a water in oil structure is formed from the graphene oxide water solution, and then liquid drop size of the emulsion is regulated and controlled, thus effective control on the size and shape of final graphene powder particles is achieved, and later stacking density of the powder can be effectively controlled by combining a step-by-step reduction process, so that a final powder material is uniform in size and high in compaction degree.

Description

technical field [0001] The invention belongs to the technical field of supercapacitor electrode materials, and relates to a preparation method of graphene powder and a supercapacitor, in particular to a graphene powder, a preparation method thereof, and a supercapacitor. Background technique [0002] Graphene is a new material with a single-layer sheet structure composed of carbon atoms. It is a planar film composed of carbon atoms with sp2 hybrid orbitals forming a hexagonal honeycomb lattice, a two-dimensional material with a thickness of only one carbon atom. As a two-dimensional crystal composed of carbon atoms with only one layer of atomic thickness, it is the thinnest material and the strongest material currently in the application field, and its fracture strength is 200 times higher than that of steel, and it is also very good Excellent elasticity, the stretching range can reach 20% of its own size; at the same time, graphene has a huge theoretical specific surface a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/19H01G11/32
CPCY02E60/13
Inventor 张筱喆周旭峰刘兆平
Owner NINGBO GRAPHENE INNOVATION CENT CO LTD