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Graphene preparation process on the basis of dry ice

A preparation process, graphene technology, applied in the direction of graphene, inorganic chemistry, electrical components, etc., can solve the problem of poor suspension effect, and achieve the effect of easy production and good suspension effect

Inactive Publication Date: 2018-04-06
CHENGDU GELAIFEI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] When the common graphene is now prepared, the graphene powder is usually placed in deionized water, or in a mixture of deionized water and ethanol, and the graphene powder is suspended in deionized water, or by stirring or ultrasonic waves. In the mixture of deionized water and ethanol, but this can only suspend a part of the graphene powder, and there are quite a lot of powders that are not suspended, and the suspension effect is poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Graphene preparation process based on dry ice, it comprises the following steps:

[0018] S1, mixing, put high-purity expanded graphite, anionic related surfactants, dispersants, defoamers and solvents in the reactor and mechanically stir for 30 minutes to form a mixed slurry;

[0019] S2, pulverizing, putting the above mixed slurry in an oven for drying at a drying temperature of 100° C., forming a solid after drying, and pulverizing the above solid to form pulverized particles with a particle size of less than 100 μm;

[0020] S3, remixing, in a low temperature environment of 66°C, add pulverized particles into liquid carbon dioxide and stir, put the mixture in an environment of -80°C and let it solidify to form a dry ice-like solid, put the dry ice in a low temperature environment Cut into chunks;

[0021] S4, forming, the mixture of deionized water and ethanol at normal temperature is placed in the container, the bottom of the container is provided with an injectio...

Embodiment 2

[0026] Graphene preparation process based on dry ice, it comprises the following steps:

[0027] S1, mixing, put high-purity expanded graphite, anionic related surfactants, dispersants, defoamers and solvents in the reactor and mechanically stir for 30-120 minutes to form a mixed slurry;

[0028] S2. Pulverizing, putting the above mixed slurry in an oven for drying at a drying temperature of 150° C., forming a solid after drying, and pulverizing the above solid to form pulverized particles with a particle size of less than 100 μm;

[0029] S3. Mix again. Add pulverized particles to the liquid carbon dioxide in a low temperature environment of -76°C and stir. Put the mixture in an environment of -110°C and allow it to solidify to form a dry ice-like solid. Put the dry ice in a low temperature environment Cut into chunks;

[0030] S4, forming, the mixture of deionized water and ethanol at normal temperature is placed in the container, an injection mechanism is arranged at the b...

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Abstract

The invention discloses a graphene preparation process on the basis of dry ice, which includes the steps of: 1) mechanically stirring high-purity expanded graphite, a related anionic-type surfactant,a dispersant, a defoamer, and a solvent, and drying and crushing stirred slurry; 2) mixing the crushed granules with liquid CO2, and solidifying the mixture to form dry ice; and 3) injecting the dry ice, which contains the granules, to the bottom of a mixture of deionized water and ethanol, so that the crushed granules are carried to the surface of the mixture of deionized water and ethanol by means of surging of the melting dry ice, and finally filtering and quickly drying the mixture to obtain graphene powder. The graphene preparation process has good powder suspension effect.

Description

technical field [0001] The invention relates to the technical field of energy and new materials, in particular to a graphene preparation process based on dry ice. Background technique [0002] The charging and discharging process of lithium-ion batteries is the process of reversible intercalation and deintercalation of Li+ between the positive and negative electrode materials. [0003] When charging, Li+ in the positive electrode material leaves the positive electrode, enters the electrolyte, migrates to the negative electrode through the diaphragm, captures electrons on the negative electrode and is reduced, and is stored in the layered structure material; when discharging, the lithium in the negative electrode will lose electrons and die Li+ is formed, enters the electrolyte, migrates through the separator to the positive electrode, and is stored in the positive electrode material. An ideal lithium-ion battery should have high specific capacity, high density, high energy ...

Claims

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Application Information

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IPC IPC(8): C01B32/184H01M4/587H01M10/0525
CPCC01B2204/22H01M4/587H01M10/0525Y02E60/10
Inventor 刘兴翀魏欣魏泽忠
Owner CHENGDU GELAIFEI TECH
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