Method for making sulfur-graphene composite material

A method for making a sulfur-graphene composite material comprising:

• providing an elemental sulfur solution and a graphene oxide dispersion, the elemental sulfur solution comprising a first solvent and an elemental sulfur dissolved in the first solvent, the graphene dispersion comprising a second solvent and a plurality of graphene oxide sheets dispersed in the second solvent;
• the elemental sulfur being insoluble in the second solvent;
• adding the elemental sulfur solution in the graphene oxide dispersion to form a mixed solution, a plurality of elemental sulfur particles being precipitated from the second solvent and attracted to a surface of the plurality of graphene oxide sheets to form the sulfur-graphene oxide composite material;
• adding a reducing agent to the mixed solution to reduce the graphene oxide sheets to the graphene sheets to form the sulfur-graphene composite material;
• and
• separating the sulfur-graphene composite material from the mixed solution.