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Three dimensional graphene/hollow carbon sphere/sulfur composite material, preparation method thereof, and application in lithium-sulfur batteries

A hollow carbon sphere, composite material technology, applied in nanotechnology for materials and surface science, battery electrodes, secondary batteries, etc., can solve the problem that graphene pore structure is not as rich as hollow carbon spheres, and hollow carbon spheres have electronic conductivity. It is not as good as graphene, reducing the battery rate performance of sulfur utilization rate, etc., to achieve the effects of flexible and controllable mechanical flexibility, inhibition of dissolution flying shuttle, and good chemical stability

Active Publication Date: 2015-09-16
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the main problems that restrict the practical application of lithium-sulfur batteries are as follows: (1) The conductivity of sulfur element is poor (only 5×10 -30 S / cm), it needs to be mixed with a large amount of conductive agent, which seriously reduces the utilization rate of sulfur and the rate performance of the battery; (2) the long-chain polysulfide lithium (Li 2 S x , x=3~8) dissolved in the electrolyte, and "shuttle" back and forth between the positive and negative electrodes, resulting in low Coulombic efficiency and reversible capacity; (3) short-chain polysulfide lithium (Li 2 S. Li 2 S 2 ) Form insoluble deposits on the surface of the positive electrode material, resulting in a decrease in electrochemical activity and a decrease in cycle performance; (4) Large volume changes during the cycle cause the pulverization and shedding of the active material
They are all good carriers for lithium-sulfur battery cathode materials with important application prospects, but each has its own shortcomings: the electronic conductivity of hollow carbon spheres is not as good as that of graphene, the pore structure of graphene is not as rich as that of hollow carbon spheres, and graphene has excellent electrical conductivity but There are problems of dissolution and shuttling of lithium polysulfide when it is used alone as a positive electrode material

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  • Three dimensional graphene/hollow carbon sphere/sulfur composite material, preparation method thereof, and application in lithium-sulfur batteries
  • Three dimensional graphene/hollow carbon sphere/sulfur composite material, preparation method thereof, and application in lithium-sulfur batteries
  • Three dimensional graphene/hollow carbon sphere/sulfur composite material, preparation method thereof, and application in lithium-sulfur batteries

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Embodiment 1

[0043] A three-dimensional graphene-hollow carbon sphere / sulfur composite material of the present invention, the three-dimensional graphene-hollow carbon sphere / sulfur composite material includes nano elemental sulfur and a three-dimensional graphene-hollow carbon sphere nanocomposite, and the nanometer elemental sulfur is evenly distributed In 3D graphene-hollow carbon sphere nanocomposites.

[0044] In the three-dimensional graphene-hollow carbon sphere / sulfur composite material of this embodiment, the three-dimensional graphene-hollow carbon sphere nanocomposite is composed of hollow carbon spheres and graphene, and the hollow carbon spheres are evenly distributed in the three-dimensional network structure formed by graphene middle. The mass ratio of the hollow carbon spheres to the graphene is 7:3, the particle size of the hollow carbon spheres is in the range of 140nm-160nm, and the average particle size is 150nm.

[0045] In the three-dimensional graphene-hollow carbon ...

Embodiment 2

[0062]A three-dimensional graphene-hollow carbon sphere / sulfur composite material of the present invention, the three-dimensional graphene-hollow carbon sphere / sulfur composite material includes nano elemental sulfur and a three-dimensional graphene-hollow carbon sphere nanocomposite, and the nanometer elemental sulfur is evenly distributed In 3D graphene-hollow carbon sphere nanocomposites.

[0063] In the three-dimensional graphene-hollow carbon sphere / sulfur composite material of this embodiment, the three-dimensional graphene-hollow carbon sphere nanocomposite is composed of hollow carbon spheres and graphene, and the hollow carbon spheres are evenly distributed in the three-dimensional network structure formed by graphene middle. The mass ratio of the hollow carbon sphere to the graphene is 8:1, the particle diameter of the hollow carbon sphere is in the range of 140nm-160nm, and the average particle diameter is 150nm.

[0064] In the three-dimensional graphene-hollow ca...

Embodiment 3

[0073] A three-dimensional graphene-hollow carbon sphere / sulfur composite material of the present invention, the three-dimensional graphene-hollow carbon sphere / sulfur composite material includes nano elemental sulfur and a three-dimensional graphene-hollow carbon sphere nanocomposite, and the nanometer elemental sulfur is evenly distributed In 3D graphene-hollow carbon sphere nanocomposites.

[0074] In the three-dimensional graphene-hollow carbon sphere / sulfur composite material of this embodiment, the three-dimensional graphene-hollow carbon sphere nanocomposite is composed of hollow carbon spheres and graphene, and the hollow carbon spheres are evenly distributed in the three-dimensional network structure formed by graphene middle. The mass ratio of the hollow carbon spheres to the graphene is 8:2, the particle diameter of the hollow carbon spheres is in the range of 180nm-220nm, and the average particle diameter is 200nm.

[0075] In the three-dimensional graphene-hollow...

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Abstract

The invention discloses a three dimensional graphene / hollow carbon sphere / sulfur composite material, a preparation method thereof, and an application in lithium-sulfur batteries. The three dimensional graphene / hollow carbon sphere / sulfur composite material comprises nanometer elemental sulfur and a three dimensional graphene-hollow carbon sphere nano-compound, and the nanometer elemental sulfur is distributed in the three dimensional graphene-hollow carbon sphere nano-compound. The preparation method comprises the following steps: dispersing the three dimensional graphene-hollow carbon sphere nano-compound in an alcohol and water mixed solvent to obtain a suspension; and adding an aqueous solution of Na2S.9H2O and Na2SO3 into the suspension, adding an acidic solution, and reacting to obtain the three dimensional graphene / hollow carbon sphere / sulfur composite material. The composite material has the advantages of high specific capacity, stable cycle performances, and excellent rate performance and coulombic efficiency, the preparation method has the advantages of simplicity, convenience and good effect, and the composite material can be applied in the preparation of lithium-sulfur battery positive electrode materials.

Description

technical field [0001] The invention relates to the field of nano-carbon materials and their preparation, in particular to a three-dimensional graphene-hollow carbon sphere / sulfur composite material, its preparation method and its application in lithium-sulfur batteries. Background technique [0002] Secondary batteries with high energy density and low cost have promising applications in portable electronic devices, electric vehicles, and smart grids. Lithium-sulfur batteries have high theoretical specific capacity (1672mAh / g) and energy density (2600Wh / kg), which are several times that of ordinary lithium-ion batteries. In addition, sulfur elemental resources are abundant, cheap, and environmentally friendly. These remarkable advantages make lithium-sulfur batteries regarded as one of the most promising power sources for next-generation electric vehicles. [0003] At present, the main problems that restrict the practical application of lithium-sulfur batteries are as foll...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/38H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 洪晓斌谢凯刘双科许静郑春满周亮君熊仕昭袁骏飞
Owner NAT UNIV OF DEFENSE TECH
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