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A kind of graphene coated carbon composite material and preparation method thereof

A carbon composite material and graphene coating technology, applied in structural parts, electrical components, battery electrodes, etc., can solve the problem of uneven discharge capacity and cycle efficiency of lithium-sulfur batteries, difficulty in ensuring high quality of lithium-sulfur batteries, and hindering materials. Follow-up use and other issues, to achieve the effect of improving electrochemical performance, low cost, and inhibiting dissolution

Inactive Publication Date: 2020-11-06
HUNAN GUOSHENG GRAPHITE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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, which hinders the subsequent use of materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The preparation method of the graphene-coated carbon composite material provided in this embodiment, the specific steps are as follows:

[0027] S1. Mix sucrose and carbon fiber at a mass ratio of 1:2, and then add deionized water for ultrasonic dispersion. The ultrasonic dispersion time is 1 hour, and a uniformly mixed solution is obtained;

[0028] S2. Using the spray pyrolysis method to prepare the mixed solution obtained in step S1 to obtain carbon microspheres, and then carry out carbonization treatment under an inert gas atmosphere to obtain spherical carbon microspheres; wherein, the spray pyrolysis method is: firstly prepare the carbon microspheres described in step S1 The mixed solution is atomized by an ultrasonic nebulizer at a flow rate of 350cc / min. The atomized mixed solution is passed into a vacuum tube furnace with nitrogen gas in advance, and subjected to constant temperature treatment. The temperature is raised to 500°C and kept for 28 hours; Keep the ...

Embodiment 2

[0033] The preparation method of the graphene-coated carbon composite material provided in this embodiment, the specific steps are as follows:

[0034] S1. Mix sucrose and carbon fiber at a mass ratio of 1:2, and then add deionized water for ultrasonic dispersion. The ultrasonic dispersion time is 3 hours to obtain a uniformly mixed solution;

[0035] S2. Using the spray pyrolysis method to prepare the mixed solution obtained in step S1 to obtain carbon microspheres, and then carry out carbonization treatment under an inert gas atmosphere to obtain spherical carbon microspheres; wherein, the spray pyrolysis method is: first mix the solution in step S1 , atomized by an ultrasonic nebulizer, the atomized flow rate is 380cc / min, and the atomized mixed solution is passed into a vacuum tube furnace with argon gas in advance, and subjected to constant temperature treatment, and the temperature is raised to 550°C and kept for 28h; constant temperature Continue for another 1 hour unti...

Embodiment 3

[0039] The preparation method of the graphene-coated carbon composite material provided in this embodiment, the specific steps are as follows:

[0040] S1. Mix sucrose and carbon fiber at a mass ratio of 1:2, and then add deionized water for ultrasonic dispersion. The ultrasonic dispersion time is 3 hours to obtain a uniformly mixed solution;

[0041] S2. Using the spray pyrolysis method to prepare the mixed solution obtained in step S1 to obtain carbon microspheres, and then carry out carbonization treatment under an inert gas atmosphere to obtain spherical carbon microspheres; wherein, the spray pyrolysis method is: first mix the solution in step S1 , atomized by an ultrasonic atomizer, the flow rate of atomization is 360cc / min, the mixed solution after atomization is passed into a vacuum tube furnace with nitrogen gas in advance, and the temperature is raised to 550°C and kept for 30h; the temperature is kept until Continue for 1 hour after the spraying is over, and collect...

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Abstract

The invention discloses a preparation method of a graphene coated carbon composite material. The method adopts sucrose, carbon fiber and graphene as the raw materials, and carries out ultrasonic dispersion, ultrasonic sprayer atomization and carbonization to effectively control the structural morphology of the composite material. The preparation method enables graphene to coat the carbon compositematerial so as to form a core-shell structure conductive network. On the one hand, the conductive network can better provide a channel for migration of ions and electrons, and improves the conductivity of positive electrode materials; and on the other hand, coating of the composite material surface with graphene can further inhibit the dissolution of a reduction product and improve the cycle performance of positive electrode materials. The graphene coated carbon composite material prepared by the method can load more elemental sulfur and hinder the dissolution of a polysulfide in an electrolyte solution when used for preparation of lithium-sulfur batteries, and then can reduce the "shuttle flying effect" of lithium-sulfur batteries, thereby improving the electrochemical performance of positive electrode materials.

Description

technical field [0001] The invention belongs to the technical field of electrode materials, and more specifically relates to a graphene-coated carbon composite material and a preparation method thereof. Background technique [0002] With the increasing demand for energy consumption in the world, the oil resources that can be developed and utilized are increasingly depleted, while the environmental pollution is becoming more and more serious. Therefore, the use of electrochemical energy storage technology to store and reuse clean solar energy and wind energy is undoubtedly the solution to this problem in the 21st century. In addition, mobile electronic devices and electric vehicles that affect people's lives also put forward higher requirements for future electrochemical energy storage technology. All of these require safe, low-cost, high-energy-density and long-life secondary batteries to be realized. Among many energy storage methods, lithium-ion batteries occupy a core po...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/587H01M4/62H01M10/0525
CPCH01M4/366H01M4/587H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 林前锋
Owner HUNAN GUOSHENG GRAPHITE TECH CO LTD
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