A novel porous nanocomposite of sulfur/carbon obtained from fish scales for lithium–sulfur batteries

A novel porous sulfur/carbon nanocomposite was prepared as the cathode material for lithium–sulfur batteries. The porous nanostructure of the composite is beneficial for enhancing the cycle life by accommodating the volume expansion of sulfur particles and adsorbing the polysulfide produced during the electrochemical reaction. The resulting nanocomposite shows a high capacity of 1039 mA h g−1 at 1C (1C = 1675 mA g−1) in the first cycle and the reversible capacity remains high at up to 1023 mA h g−1 even after 70 cycles.