Method of preparing graphene-sulfur nanocomposites for rechargeable lithium-sulfur battery electrodes

摘要

A method of preparing a graphene-sulfur nanocomposite for a cathode in a rechargeable lithium-sulfur battery comprising thermally expanding graphite oxide to yield graphene layers, mixing the graphene layers with a first solution comprising sulfur and carbon disulfide, evaporating the carbon disulfide to yield a solid nanocomposite, and grinding the solid nanocomposite to yield the graphene-sulfur nanocomposite. Rechargeable-lithium-sulfur batteries having a cathode that includes a graphene-sulfur nanocomposite can exhibit improved characteristics. The graphene-sulfur nanocomposite can be characterized by graphene sheets with particles of sulfur adsorbed to the graphene sheets. The sulfur particles have an average diameter of less than 50 nm.

主权项

1. A method of preparing a graphene-sulfur nanocomposite for a cathode in a rechargeable lithium-sulfur battery, the graphene-sulfur nanocomposite comprising graphene layers, wherein the graphene layers have thicknesses of equal to or less than about 10 nm, and with particles comprising sulfur adsorbed to the graphene layers, the method comprising:
thermally expanding graphite oxide to yield graphene layers; mixing the graphene layers with a first solution comprising sulfur and carbon disulfide; evaporating the carbon disulfide to yield a solid nanocomposite; and grinding the solid nanocomposite to yield the graphene-sulfur nanocomposite having sulfur particles with an average diameter less than approximately 50 nm.