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Porous graphene powder as well as preparation method and application thereof

A porous graphene and powder technology, applied in graphene, chemical instruments and methods, nanotechnology for materials and surface science, etc., can solve the problem of uncontrollable pore size, and achieve simple preparation method and good process stability , the effect of good magnification performance

Pending Publication Date: 2022-01-18
天津艾克凯胜石墨烯科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the existing preparation methods of porous graphene, the pore size cannot be controlled, and the control of pore size is of great significance for the application of porous graphene

Method used

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  • Porous graphene powder as well as preparation method and application thereof
  • Porous graphene powder as well as preparation method and application thereof
  • Porous graphene powder as well as preparation method and application thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0030] The invention provides a kind of preparation method of porous graphene powder, comprises the following steps:

[0031] S1. Dissolve the expanded graphite in deionized water, stir in the reaction kettle evenly to obtain a dispersion;

[0032] Among them, the D50 of expanded graphite is 40-100μm, and the specific surface area is 30-50m 2 / g, the bulk density is 0.02-0.04g / cm 3 , the magnetic foreign matter is less than 1000ppb, the stirring speed of the reactor is 80-100r / min, the rotating speed of the dispersing plate of the reactor is 1200-1500r / min, stirring and dispersing for 1-2h, the content of expanded graphite is 1-2.5wt of the mixed solution %;

[0033] S2. The dispersion liquid obtained in step S1 is sent into the micro-jet equipment for processing through the diaphragm pump, the flow rate of the diaphragm pump is 20-30 / min, the micro-jet pressure is 1000-1200MPa, and the above steps are repeated 3-5 times;

[0034] S3. Freeze-drying or microwave-drying the s...

Embodiment 1

[0042] The invention provides a kind of preparation method of porous graphene powder, comprises the following steps:

[0043] S1. Dissolve the expanded graphite in deionized water, stir in the reaction kettle evenly to obtain a dispersion;

[0044] Among them, the D50 of expanded graphite is 40μm, and the specific surface area is 30m 2 / g, bulk density is 0.04g / cm 3 , the magnetic foreign matter is less than 800ppb, the stirring speed of the reactor is 80r / min, the rotating speed of the dispersing plate of the reactor is 1500r / min, stirring and dispersing for 1h, the content of expanded graphite is 1wt% of the mixed solution;

[0045]S2. The dispersion liquid obtained in step S1 is sent into the micro-jet equipment for processing through the diaphragm pump, the flow rate of the diaphragm pump is 20 / min, the micro-jet pressure is 1000MPa, and the above-mentioned steps are repeated 3 times;

[0046] S3. Freeze-drying the solution obtained in step S2 to prepare a powder;

[00...

Embodiment 2

[0051] Specifically with embodiment 1, the difference is:

[0052] In this example, in step S1, the D50 of expanded graphite is 100 μm, and the specific surface area is 35 m 2 / g, bulk density is 0.02g / cm 3 , the magnetic foreign matter is less than 700ppb, the stirring speed of the reactor is 85r / min, the rotating speed of the dispersing plate of the reactor is 1200r / min, stirring and dispersing for 2h, the content of expanded graphite is 1.5wt% of the mixed solution;

[0053] In step S2, the flow rate of the diaphragm pump is 25 / min, the microjet pressure is 1200MPa, and the above steps are repeated 4 times;

[0054] In step S4, the activation temperature is 1100° C. for 5 hours at a constant temperature, and the amount of carbon dioxide introduced is 2.5 L / min;

[0055] In step S5, the activation temperature is 1100° C. for 5 hours at a constant temperature, and the amount of water vapor introduced is 2.5 L / min.

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Abstract

The invention discloses porous graphene powder as well as a preparation method and application thereof, belonging to the technical field of graphene material preparation. The preparation method for the porous graphene powder comprises the following steps: S1, dissolving expanded graphite in deionized water, and carrying out uniform stirring in a reaction kettle to obtain a dispersion liquid; S2, feeding the dispersion liquid obtained in the step S1 into micro-jet equipment for treatment, and repeating the above steps 3-5 times; S3, subjecting the solution obtained in the step S2 to freeze drying or microwave drying treatment so as to prepare powder; S4, introducing carbon dioxide into the powder obtained in the step S3 for activating treatment; and S5, continuously introducing water vapor into the powder obtained in the step S4 for activation to obtain the porous graphene powder. The preparation method is simple in process, friendly to environment and good in process stability, the pore diameter of the porous graphene powder can be regulated and controlled, and when the prepared porous graphene powder is used as a lithium ion battery positive electrode conductive agent, a lithium ion battery shows excellent rate capability.

Description

technical field [0001] The invention relates to a porous graphene powder and its preparation method and application, belonging to the technical field of graphene material preparation. Background technique [0002] Graphene has an ideal two-dimensional crystal structure of single atomic layer, which is composed of hexagonal lattice. This special structure endows graphene materials with unique thermal, mechanical and electrical properties. At present, graphene has been widely used in lithium-ion battery electrode materials, supercapacitors, solar cell electrode materials, hydrogen storage materials, sensors, optical materials, drug carriers, etc., and the application prospects of graphene are very broad. [0003] Porous graphene, as a new type of graphene-based material, not only retains the excellent properties of graphene itself, but compared with the inert graphene surface, the introduction of pores can effectively open the energy band gap of graphene, greatly improving the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/19C01B32/194H01M4/62B82Y30/00B82Y40/00
CPCC01B32/19C01B32/194H01M4/625B82Y30/00B82Y40/00C01B2204/32C01B2204/22Y02E60/10
Inventor 韩双超欧阳再国吕茂有耿玉东
Owner 天津艾克凯胜石墨烯科技有限公司
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