To ensure homogeneous mixture preparationa slurry consisting of 10mL of phenol formaldehyde resin and Sulfur at a desired wt/wt % content were mixed in an ice-bath using an ultrasonicator for 5 minutes at a frequency of 15 kHz. Thin layers of said slurry were spin-coated at 3000 RPM for 30 seconds onto a standard stainless steel (316L/304) current collector (15 mm diameter, 0.5 mm thickness.