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Preparation method of graphene/activated carbon microsphere

A technology of activated carbon microspheres and graphene, which is applied in the direction of graphene, electrical components, battery electrodes, etc., can solve the uneven discharge capacity and cycle efficiency of lithium-sulfur batteries, and it is difficult to ensure the high quality of lithium-sulfur batteries, and it is difficult to ensure consistency In order to improve the electrochemical performance, good application prospects, excellent appearance and performance

Inactive Publication Date: 2018-08-10
HUNAN GUOSHENG GRAPHITE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] After searching the existing technology, the discharge capacity and cycle efficiency of lithium-sulfur batteries prepared by using carbon materials are uneven, and it is difficult to ensure the high quality of lithium-sulfur batteries. many
The prepared activated carbon materials have different shapes, and it is difficult to ensure consistency

Method used

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  • Preparation method of graphene/activated carbon microsphere

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preparation example Construction

[0029] The method for preparing graphene / activated carbon microspheres of the present invention includes the following steps:

[0030] S1. Mix sucrose and carbon fiber in a deionized aqueous solution, stir at room temperature for 4-6 hours, and then use an electromagnetic ultrasonic device for ultrasonic dispersion. The ultrasonic dispersion power is 350-550W; the ultrasonic dispersion time is 0.5-1h to obtain a mixed solution ;

[0031] S2. The mixed solution of step S1 is atomized by an ultrasonic atomizer, and the flow rate of the atomization is 350-380cc / min. The atomized mixed solution is passed into a vacuum tube furnace pre-passed with inert gas for constant temperature treatment. Raise the temperature to 500~550℃, keep the temperature for 28~30h; keep the constant temperature until the spraying ends and continue for 1h. After the reaction furnace is cooled to room temperature, collect the product deposited in the tube;

[0032] S3. Mix the product described in step S2 with t...

Embodiment 1

[0037] (1) Preparation method of graphene / activated carbon microspheres

[0038] The preparation method of graphene / activated carbon microspheres of this embodiment includes the following steps:

[0039] S1. Mix sucrose with a mass ratio of 1:2 and carbon fiber sucrose in a deionized aqueous solution. The total mass of sucrose and carbon fiber and the mass ratio of deionized water are 1:25. After stirring for 4 hours at room temperature, use an electromagnetic ultrasonic device Carry out ultrasonic dispersion, the power of ultrasonic dispersion is 550W; the time of ultrasonic dispersion is 1h to obtain a mixed solution;

[0040] S2. The mixed solution of step S1 is atomized by an ultrasonic atomizer, and the flow rate of the atomization is 350cc / min. The atomized mixed solution is passed into a vacuum tube furnace pre-passed with inert gas for constant temperature treatment. The heating rate of the furnace is 5~10℃ / min, the temperature is raised to 550℃, and the temperature is kept ...

Embodiment 2

[0048] (1) Preparation method of graphene / activated carbon microspheres

[0049] The preparation method of graphene / activated carbon microspheres of this embodiment includes the following steps:

[0050] S1. Mix sucrose with a mass ratio of 1:2 and carbon fiber sucrose in a deionized water solution. The total mass of sucrose and carbon fiber and the mass ratio of deionized water are 1:25. After stirring for 6 hours at room temperature, use an electromagnetic ultrasonic device Carry out ultrasonic dispersion, the power of ultrasonic dispersion is 350W; the time of ultrasonic dispersion is 0.5h to obtain a mixed solution;

[0051] S2. The mixed solution of step S1 is atomized by an ultrasonic sprayer, and the flow rate of the atomization is 380cc / min. The atomized mixed solution is passed into a vacuum tube furnace pre-passed with inert gas for constant temperature treatment. The furnace heating rate is 5-10°C / min, the temperature is raised to 500°C, and the temperature is kept for 30...

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Abstract

The invention discloses a preparation method of a graphene / activated carbon microsphere. The graphene / activated carbon microsphere prepared by the method has the characteristics of spherical structure, large specific surface area and good dispersion, and effectively improves the electrochemical performance of cathode materials. The preparation method of the graphene / activated carbon microsphere includes ultrasonic dispersion, atomization pyrolysis, atomization drying and carbonization, integrates the whole production process, effectively controls the molding of the graphene / activated carbon microsphere, and ensures the material quality. The preparation method has the advantages of simple operation, low cost, energy saving and environmental protection. The prepared graphene / activated carbonmicrosphere has a large specific surface area, not only can be used for electrode materials, and also can be applied to catalyst carriers, water treatment, sewage purification, solvent adsorption andrecovery and other related fields, and has great application prospects.

Description

Technical field [0001] The invention relates to the field of material preparation, in particular to a method for preparing graphene / activated carbon microspheres. Background technique [0002] Lithium-ion batteries use graphite materials as the negative electrode, lithium iron phosphate, lithium cobalt oxide, lithium manganate and other lithium-containing metal oxides as the positive electrode, and use the "rocking chair effect" of lithium ions between the positive and negative electrodes to contribute capacity. The theoretical specific capacity of the secondary lithium ion battery is close to 300mAh / g. Even so, it is difficult to meet the requirements of the secondary battery that people need. At the same time, the fuel cell is difficult to be practical in a short time, so it has a theoretical ratio of 1650mAh / g. High-capacity lithium matte batteries have become the most attractive secondary battery system at present. [0003] Lithium matte batteries use elemental sulfur as the p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/184H01M4/36H01G11/24
CPCC01B32/184H01G11/24H01M4/362Y02E60/10
Inventor 林前锋
Owner HUNAN GUOSHENG GRAPHITE TECH CO LTD
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