CR2032 coin cells, containing the composite sulfur-graphene cathode, a separator, lithium metal, and a spring, were assembled after drying in a glovebox (<0.1 ppm O2). The separators were Whatman ® glass microfiber filters (Grade GF/B) punched into 18 mm discs in diameter, and the lithium metal discs (15 mm in diameter) were purchased from S4R, France. 80 μL of 1 M LiTFSI in 1,3-dioxolane (DOL)/dimethoxy ethane (DME) (1:1) as an electrolyte was used in all of the experiments (Sigma-Aldrich). The cells were kept at a constant temperature of 25 °C throughout all the experiments.