A kind of preparation method of graphene carbon nanotube composite conductive framework for lithium-sulfur battery

Abstract

The invention discloses a method for preparing a graphene carbon nanotube composite conductive framework for a lithium-sulfur battery. The method comprises the following steps: S1, preparing mixed slurry from graphene oxide and carbon nanotue powder; S2, adding a surfactant, mixing, and dispersing so as to obtain a graphene oxide carbon nanotube dispersant; S3, adding an adhesive and a curing agent, mixing, and dispersing so as to obtain a precursor solution; S4, evaporating the solution of the precursor solution, and performing curing treatment so as to obtain graphene oxide carbon nanotube composite precursor powder; and S5, performing high-temperature carbonization reduction, thereby obtaining a graphene oxide carbon nanotube three-dimensional composite conductive framework. The methodis simple and efficient in process step, low in cost and easy in industrial application, the microstructure carbon nanotubes of the prepared graphene oxide carbon nanotube composite powder are dispersed on the surface of graphene, a single-layer dispersion structure of the graphene is maintained, a good synergetic effect between the graphene and the carbon nanotubes is achieved, and the frameworkis an efficient three-dimensional conductive framework.

Description

technical field [0001] The invention relates to the field of graphene composite materials, in particular to a method for preparing a graphene carbon nanotube composite conductive framework for lithium-sulfur batteries. Background technique [0002] Lithium-sulfur batteries use elemental sulfur as the cathode and metal lithium as the anode. Its theoretical energy density can reach 2600Wh / kg, which is 6 to 7 times the energy density of current lithium-ion batteries. Lithium-sulfur batteries have rich sources of raw materials, large reserves, and low prices. Low cost, environment-friendly and other characteristics, it is a new generation of energy storage system with great development potential after lithium-ion batteries. However, the energy density of commercial lithium-sulfur batteries is only 300Wh / kg, which is far from its theoretical energy density. This is mainly because sulfur materials and their discharge products, lithium sulfide and lithium disulfide, are poor conduc...

AI Technical Summary

Problems solved by technology

However, due to the large specific surface area of ​​single-layer graphene, there is a strong van der Waals force between the sheets, which makes the sheet-folding and agglomeration effect easily occur between the exfoliated graphene sheets, and cannot effectively develop the two-dimensional graphene. The conductive advantage of the skeleton

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