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Preparation method and application of graphene slurry

A graphene and slurry technology, applied in the field of preparation of sulfur-free graphene slurry, can solve the problem of high sulfur content in graphene products, improve the rate charge-discharge performance and cycle performance, good electrical conductivity, and reduce the amount of addition. Effect

Inactive Publication Date: 2015-11-18
SHENZHEN SSZK NEW MATERIALS CO LTD
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0005] The embodiment of the present invention provides a method for preparing graphene slurry, the purpose of which is to overcome the problems of high sulfur content in graphene products prepared by the existing redox method and intercalation exfoliation method

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  • Preparation method and application of graphene slurry

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[0020] The embodiment of the present invention provides a kind of preparation method of graphene slurry, the preparation method of this graphene slurry comprises the following steps:

[0021] A. Weigh the reaction material according to the ratio of graphite: intercalant: oxidizing agent: 1g: (3-30) mL: (0.1-3.0) g, then carry out the mixing reaction treatment of the weighed reaction material, and then Washing and drying treatment to obtain graphite intercalation compound;

[0022] B. Expanding the graphite interlayer compound to obtain expanded graphite;

[0023] C. Perform mixing and dissociation treatment of the graphite expanded body according to the mass percentage of graphite expanded body: dispersing aid: solvent (1.0-10.0): (0.1-2.0): 100.0, to obtain graphene slurry.

[0024] Wherein, in one embodiment, the graphite in step A is natural flake graphite. Natural flake graphite is a hexagonal crystal system with a layered structure, which is convenient for oxidation int...

Embodiment 1

[0045] A. Preparation of graphite interlayer compound: according to natural flake graphite: nitric acid: KMnO 4 =1g: 20mL: 0.8g, weigh a certain amount of natural flake graphite, nitric acid and potassium permanganate respectively, wherein the carbon content of the weighed natural flake graphite is 99.9%, 30 mesh. Put the weighed natural flake graphite into a dry and clean reaction kettle, then add the weighed nitric acid with a mass concentration of 98%, and stir and mix evenly. Gradually add the weighed KMnO to the kettle in batches 4 , and control the reaction temperature at 25°C, and stir the reaction for 60min. Finally, deionized water is slowly added to the reaction system, wherein the volume of deionized water added is 2 times the volume of the intercalation agent (nitric acid). °C drying to obtain graphite intercalation compound.

[0046] B. Preparation of graphite extruded body: place the dried graphite interlayer compound in a muffle furnace for heat treatment at ...

Embodiment 2

[0049] A. Preparation of graphite interlayer compound: according to natural flake graphite: a mixture of nitric acid and acetic acid: K 2 Cr 2 o 7 =1g: 3mL: 0.1g, take a certain amount of natural flake graphite, the mixture of nitric acid and acetic acid and potassium dichromate respectively, wherein, the carbon content of the natural flake graphite taken by weighing is 90%, 1000 mesh, the nitric acid In the mixture of nitric acid and acetic acid, the mass concentration of nitric acid is 65%, and the mass ratio of nitric acid to acetic acid is 1:1. Put the weighed natural flake graphite into a dry and clean reaction kettle, then add the weighed mixture of nitric acid and acetic acid into it, and stir and mix evenly. Gradually add the weighed potassium dichromate into the kettle in batches, control the reaction temperature at 60°C, and stir for 100 minutes. Finally, deionized water is slowly added to the reaction system, wherein the volume of deionized water added is twice t...

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Abstract

The invention relates to the graphene technical field, and specifically discloses a preparation method and an application of a graphene slurry. The preparation method of the graphene slurry includes the following steps of preparation of a graphite intercalated compound, preparation of a graphite expansion body and preparation of the graphene slurry, wherein an intercalator is any one of nitric acid with the mass concentration of 65%-98%, a mixture of nitric acid with the mass concentration of 65%-98% and an organic acid, and a mixture of nitric acid with the mass concentration of 65%-98% and phosphoric acid with the mass concentration of 80%-98%. The preparation of the graphene slurry has no need of concentrated sulfuric acid as a reaction medium, and the prepared graphene slurry does not contain sulfur and has less layer number. The graphene slurry can greatly increase multiplying power capability and cycle performance of lithium ion batteries when used in the lithium ion batteries, and can overcome defects of a conventional sulfur-containing graphene material in anticorrosive coatings when used in a graphene anticorrosive coating. The preparation method of the graphene slurry provides a good route for production and application of sulfur-free graphene and is suitable for realizing industrialization.

Description

technical field [0001] The invention relates to the technical field of graphene materials, in particular to a preparation method and application of a sulfur-free graphene slurry. Background technique [0002] Since the preparation of graphene materials by Professor Andre K. Geim of the University of Manchester in 2004, because of its unique structure, excellent electricity, mechanics, optics, chemistry and heat, etc. Performance has become a hot topic of research for many people, and two scientists, Andre K. Geim (AndreK. Work and outstanding contributions jointly won the 2010 Nobel Prize in Physics. [0003] At present, the large-scale preparation of graphene powder materials mainly adopts the "top-down" preparation method, which mainly includes two methods: redox and intercalation. The redox method is to react natural flake graphite with strong acid and strong oxide to form graphite oxide (GO), which is dispersed into graphene oxide (single-layer graphite oxide) by ultra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04H01M4/62C09D7/12C09D5/08
CPCY02E60/10
Inventor 谢书云谢洪超刘大喜张伟
Owner SHENZHEN SSZK NEW MATERIALS CO LTD
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