Porous carbon-graphene composite material and preparation method thereof

A composite material and graphene technology, which is applied in the direction of electrical components, electrochemical generators, battery electrodes, etc., can solve the problems of easy collapse of structural junctions and unfavorable use, and achieve improved cycle performance, increased conductivity and specific surface area, and preparation Effects in simple steps

Inactive Publication Date: 2020-11-06
GUANGDONG UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The invention provides a porous carbon-graphene composite material and a preparation method thereof in order to solve the technical problem that the structure junction of the existing lithium battery negative electrode material is easy to collapse during the carbonization process, which is not conducive to use

Method used

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  • Porous carbon-graphene composite material and preparation method thereof

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preparation example Construction

[0026] The embodiment of the present invention provides a kind of preparation method of porous carbon-graphene composite material, comprises the following steps:

[0027] S1, adding the superabsorbent resin into the graphene oxide solution treated with ultrasound, and freeze forming;

[0028] S2. Freeze-drying in a vacuum environment to obtain a superabsorbent resin-graphene oxide composite material;

[0029] S3. Under a protective atmosphere, the obtained composite material is sequentially carbonized at 500-1000° C., washed, dried to constant weight, and the porous carbon-graphene composite material is ground.

[0030] The embodiment of the present invention uses superabsorbent resin, water and a small amount of graphene oxide as raw materials, and the cost is relatively low. The graphene oxide solution will fill the superabsorbent resin, and the structure of the porous carbon-graphene composite material obtained after carbonization will not collapse. Moreover, graphene oxid...

Embodiment 1

[0041] Prepare a graphene oxide solution with a concentration of 0.5g / L and ultrasonicate for 30 minutes, take 1g of sodium polyacrylate and add it to 100ml of the intrinsic graphene oxide solution and stir. Dry to constant weight, and heat at 800° C. for 120 min under a nitrogen atmosphere. After carbonization is completed, wash, dry to constant weight, and grind to obtain a porous carbon-graphene composite material.

[0042] Making Porous Carbon-Graphene Composites into Button Cells. After the electrochemical performance test, when the current density is 0.1C, the first discharge specific capacity is 353.81mAh / g, after 100 cycles, the discharge specific capacity is 383.90mAh / g, the capacity retention rate is 108.50%, and the cycle performance is excellent.

[0043] figure 1 Obtain the SEM figure of graphene after graphene oxide reduction in the present embodiment, from figure 1 It can be seen that graphene oxide has good dispersion and is a single layer, which can give ful...

Embodiment 2

[0045] A nitrogen-doped graphene oxide solution with a concentration of 0.5g / L was ultrasonicated for 30min, and 1g of sodium polyacrylate was added to 100ml of graphene oxide solution and stirred to make it evenly distributed, and freeze-dried to constant weight. Heating at 500°C for 30 minutes, after carbonization, washing to remove salt ions therein, drying to constant weight, and grinding to obtain a porous carbon-graphene composite material.

[0046] Porous carbon-graphene composites are used as anode materials for lithium-ion batteries to make button batteries. After the electrochemical performance test, when the current density is 0.1C, the first discharge specific capacity is 334.29mAh / g, after 100 cycles, the discharge specific capacity is 340.28 mAh / g, the capacity retention rate is 101.79%, and the cycle performance is better.

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Abstract

The embodiment of the invention provides a porous carbon-graphene composite material and a preparation method thereof. The preparation method comprises the following steps: adding super absorbent resin into a graphene oxide solution subjected to ultrasonic treatment, and conducting freezing forming; performing freeze drying in a vacuum environment to obtain a super absorbent resin-graphene oxide composite material; and in a protective atmosphere, sequentially carbonizing, washing and drying the obtained composite material to constant weight at 500-1000 DEG C, and grinding to obtain the porouscarbon-graphene composite material. According to the embodiment of the invention, super absorbent resin, water and a small amount of graphene oxide are used as raw materials; the cost is low, the super absorbent resin is filled with the graphene oxide solution, the structure of the porous carbon-graphene composite material obtained after carbonization cannot collapse, the graphene oxide has excellent conductivity after thermal reduction, the porous carbon is filled with the graphene oxide, the conductivity and the specific surface area of the porous carbon are greatly increased, and the reaction activity and the reaction rate are improved. The method is simple in preparation steps, free of toxic and harmful solvents, environment-friendly and efficient.

Description

technical field [0001] The invention relates to the field of new energy, in particular to a porous carbon-graphene composite material and a preparation method thereof. Background technique [0002] The positive and negative electrodes of lithium-ion batteries are the basis of battery performance, which directly determine various performance indicators such as specific energy, specific power, cycle stability and safety of the battery. At present, carbon materials are commonly used in negative electrodes, and among them, porous carbon materials are the most widely used due to their excellent electrical conductivity, low cost, and simple preparation process. The superabsorbent resin can absorb water hundreds of times the volume of the resin, and can effectively expand its volume. After absorbing water and drying, it will form a large number of channels and holes in the water-absorbent resin. After carbonization, it can form a carbon material with a high specific surface area. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/583H01M4/62H01M10/0525
CPCH01M4/362H01M4/583H01M4/62H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 闵永刚朋小康张诗洋刘屹东廖松义刘荣涛黄兴文
Owner GUANGDONG UNIV OF TECH
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