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Hollow graphene ball and preparation method and application thereof

A graphene sphere and hollow technology, applied in the field of hollow graphene sphere and its preparation, can solve the problems of low yield, complex preparation process, poor electrochemical performance, etc., and achieve high yield, good controllability, excellent The effect of electrochemical performance

Active Publication Date: 2014-08-27
SHANGHAI SINOPOLY JIAHUA BATTERY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem solved by the present invention is to overcome the defects of existing graphene materials such as complex preparation process, low yield, and poor electrochemical performance, and provide a hollow graphene sphere and its preparation method and use

Method used

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  • Hollow graphene ball and preparation method and application thereof
  • Hollow graphene ball and preparation method and application thereof
  • Hollow graphene ball and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] A preparation method of hollow graphene spheres, comprising the steps of:

[0056] (1) 0.4g SiO 2 Powder (average particle size 15nm) and 0.1g graphene oxide were dispersed in 200mL deionized water, and ultrasonically dispersed for 30min to obtain a dispersed suspension;

[0057] (2) Spray-dry the dispersed suspension with an inlet temperature of 200°C and an outlet temperature of 110°C to obtain a precursor; the precursor is graphene oxide-wrapped SiO 2 powder compound;

[0058] (3) Place the precursor in a high-temperature furnace, feed a mixed gas of ammonia and argon, the volume content of ammonia in the mixed gas of ammonia and argon is 10%, and the temperature is 10°C min -1 The heating rate is increased to 1100°C for reduction treatment, and then directly cooled to room temperature without heat preservation to obtain the reduced product;

[0059] (4) Mix the reducing substance with hydrofluoric acid to SiO 2 Dissolve completely; collect the solid matter remai...

Embodiment 2

[0065] A preparation method of hollow graphene spheres, comprising the steps of:

[0066] (1) Add 0.1g Fe 2 o 3 Disperse the powder (particle size 50-100nm) and 0.1g graphene oxide in 100mL methanol, and ultrasonically disperse for 60min to obtain a dispersed suspension;

[0067] (2) Spray-dry the dispersed suspension with an inlet temperature of 220°C and an outlet temperature of 140°C to remove methanol to obtain a precursor, which is graphene oxide-wrapped Fe 2 o 3 powder compound;

[0068] (3) Put the precursor in a high-temperature furnace, feed a mixed gas of hydrogen and argon, the volume content of hydrogen in the mixed gas of hydrogen and argon is 5%, raise the temperature to 300° C. for reduction treatment, keep the temperature for 5 hours, and then Cool naturally to room temperature to obtain the reduced product;

[0069] (4) Mix the reducing substance with concentrated hydrochloric acid until Fe 2 o 3 Dissolve completely, collect the solid matter remaining a...

Embodiment 3～ Embodiment 5

[0075] Each step in the preparation method of Examples 3 to 5 is the same as that of Example 1, wherein different process conditions are listed in Table 1, and other conditions not listed are the same as Example 1.

[0076] Process condition in table 1 embodiment 3~5

[0077]

[0078] The hollow graphene spheres obtained in Examples 3 to 5 have similar morphology and electrochemical properties to the samples in Examples 1 and 2.

[0079] It can be seen from the above examples that the present invention uses a simple method of atomization drying combined with etching technology to prepare hollow graphene spheres as the positive electrode material for lithium-air batteries. The surface and interior of the product obtained by this method have different levels of pores, and the pore size ratio can be controlled and adjusted through the particle size and dispersion state of the powder. The porous surface and hollow structure facilitates the entry of oxygen into the air electrod...

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Abstract

The invention discloses a hollow graphene ball and a preparation method and application of the hollow graphene ball. The preparation method of the hollow graphene ball includes the steps that powder and oxidized graphene are dispersed in liquid at the weight ratio ranging from 1 : 0.01 to 1 : 20, and dispersed suspension liquid is obtained, wherein powder is nanometer powder and / or micrometer powder; spray drying is conducted on the dispersed suspension liquid, and a precursor is obtained; in protective gas, reduction treatment is conducted on the precursor at the temperature ranging from 200 DEG C to 1100 DEG C, the precursor is cooled to the room temperature after being treated, and then reduzate is obtained, wherein reduzate contains powder or reactant of powder; the reduzate is mixed with a solvent to make powder or the reactant of powder dissolved, and then the hollow graphene ball is obtained after solids are separated. The preparation method is simple in operation, environment friendliness is achieved, the yield is high, cost is low, and the preparation method is suitable for industrialized mass production. The hollow graphene ball has excellent electrochemical performance, and can be used as a positive electrode material of a lithium air cell.

Description

technical field [0001] The invention relates to a hollow graphene sphere, a preparation method and application thereof. Background technique [0002] With the gradual depletion of fossil energy such as oil, coal, and natural gas, and the increasing severity of environmental problems such as climate anomalies, it is increasingly urgent to develop clean energy and its application technologies. The development of clean energy electric vehicles and hybrid vehicles to reduce greenhouse gas emissions such as carbon dioxide has become an inevitable direction for the development of the automotive industry today. However, the current battery system is still difficult to fully meet the strict requirements of high energy and power density, low price, high safety, long life, and no pollution. Lead-acid, nickel-hydrogen, and nickel-cadmium batteries have large mass and small specific energy (<50Wh kg -1 ); the cost of fuel cells is high, and there are still hidden dangers in safety;...

Claims

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Application Information

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IPC IPC(8): H01M4/133H01M4/1393
CPCY02E60/122C01B32/184H01M4/587H01M12/06Y02E60/10
Inventor 袁涛李文婷马紫峰何雨石廖小珍
Owner SHANGHAI SINOPOLY JIAHUA BATTERY TECH
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