The electrochemical performance of the graphene-sulfur composite cathodes was evaluated using a CR2025 coin-cell configuration. Batteries were assembled in an inert glovebox (<0.1 ppm O2) using the pre-made cathodes, separator, and lithium metal as the counter-electrode. The electrolyte used in all experiments was 80 μL of 1 M LiTFSI in 1:1 DOL:DME. The separator used was cut from Whatman® glass microfiber filters (Grade GF/B) and the lithium metal discs (15 mm in diameter) were purchased from S4R, France. All the assembled cells were kept at 30 °C throughout their cycling. Electrochemical measurements were conducted using a Bio-Logic BCS battery cycler.