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Carbon sphere/sulfur/reduced and oxidized graphene composite material for lithium sulfur battery and preparation method of carbon sphere/sulfur/reduced and oxidized graphene composite material

A composite material, lithium-sulfur battery technology, applied in lithium batteries, battery electrodes, non-aqueous electrolyte batteries, etc., can solve the problems of lithium-sulfur battery capacity and energy decline, achieve good application prospects, enhance rate performance and cycle stability performance , the effect of regulating the thickness of the pole piece

Active Publication Date: 2018-03-06
SHANDONG UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, the elemental sulfur prepared by the above method is only distributed on the surface of the conductive additive, and cannot completely bind the elemental sulfur and the polysulfides generated during charging and discharging. The polysulfides lost on the surface of the conductive additive will still produce a "shuttle effect". Lithium-sulfur batteries The capacity and energy of the

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Embodiment 1

[0037] A method for preparing a reduced graphene oxide / sulfur / carbon sphere composite material for lithium-sulfur batteries, the steps are as follows:

[0038] 1. Take 200ml of graphene oxide aqueous solution with a concentration of 5mg / ml, add 0.5g of conductive carbon black, ultrasonically disperse for 2 hours, and spray dry. The temperature is set at 150°C to obtain carbon spheres containing graphene oxide. After drying, place In a tube furnace, under argon protection, heat treatment at 500°C for 2 hours to obtain carbon spheres containing reduced graphene oxide.

[0039] 2. Weigh 1g of the above-mentioned carbon spheres and mix them with 5g of sublimated sulfur, add a small amount of ethanol to disperse, ball mill for 1h, and vacuum dry at 55°C for 6h to obtain a sulfur / carbon sphere mixture. The scanning electron microscope of the sulfur / carbon sphere mixture is as follows: figure 2 shown by figure 2 It can be seen that sulfur is uniformly stored in the surface folds a...

Embodiment 2

[0046] A method for preparing a reduced graphene oxide / sulfur / carbon sphere composite material for lithium-sulfur batteries, the steps are as follows:

[0047] 1. Take 200ml of graphene oxide aqueous solution with a concentration of 5mg / ml, add 1.0g of conductive carbon black, ultrasonically disperse for 2 hours, and spray dry. The temperature is set at 155°C to obtain carbon spheres containing graphene oxide. After drying, place In a tube furnace, under argon protection, heat treatment at 500°C for 1 h to obtain carbon spheres containing reduced graphene oxide.

[0048] 2. Weigh 5g of sulfur powder, dissolve it in 500ml of carbon tetrachloride solution, and ultrasonicate for 2 hours to dissolve completely.

[0049] 3. Add 1 g of the above-prepared carbon spheres to the carbon tetrachloride solution, and rotatively evaporate at room temperature. After the carbon tetrachloride is naturally evaporated to dryness, the sulfur / carbon sphere composite is obtained, and dried in a vac...

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Abstract

The invention relates to a carbon sphere / sulfur / reduced and oxidized graphene composite material for a lithium sulfur battery and a preparation method of the carbon sphere / sulfur / reduced and oxidizedgraphene composite material. The preparation method comprises the following steps: firstly, performing the heat treatment or solution soaking sulfur precipitation compounding for sulfur and carbon spheres, then mixing and stirring a sulfur / carbon sphere complex and a binder to form slurry, smearing the slurry onto an aluminum foil, drying the aluminum foil, then placing the aluminum foil in graphene oxide dispersion liquid, depositing and reducing the graphene oxide by virtue of electrochemical reduction, and thus obtaining the reduced graphene oxide-sealed sulfur / carbon sphere composite anodematerial. The carbon sphere prepared by the method of the invention has rich surface creases and inner porous structure and higher specific surface area (1000m<2> / g), and can load more sulfur, wherein the content of the solid sulfur reaches up to 80 percent. The reduced graphene oxide layer has higher conductivity and rich porous structure, facilitates the passing of lithium ions, can effectivelyinhibit the loss of sulfur and poly-sulfide, can improve the conductivity and cycling stability of the sulfur / carbon sphere composite material, and has a higher practical prospect.

Description

technical field [0001] The invention relates to a carbon sphere / sulfur / reduced graphene oxide composite material for lithium-sulfur batteries and a preparation method thereof, belonging to the technical field of lithium-sulfur batteries. Background technique [0002] In recent years, energy and environmental issues have become increasingly prominent. With the rapid development of electronic equipment, especially electric vehicles, traditional lithium-ion batteries have been unable to meet market needs. Therefore, seeking a new high-energy battery system has become a research hotspot in the field of energy storage. The lithium-sulfur battery is a battery system with sulfur as the positive electrode and metal lithium as the negative electrode. It has a high theoretical specific capacity (1675mAh / g), a theoretical specific energy of 2600Wh / kg, and has the advantages of high energy density, low cost, and low pollution. , is considered to be one of the most promising next-generat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052
CPCH01M4/366H01M4/38H01M4/625H01M10/052Y02E60/10
Inventor 侯士峰张军峰刘靓蕾郑逸群王华
Owner SHANDONG UNIV
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