Preparation and electrochemical characterization of the porous sulfur cathode using a gelatin binder

A novel porous sulfur cathode in which a gelatin was used as the binder was prepared by using a freeze–drying method at −58 °C. The porous structure provides channels for electrolyte infiltration and then facilitates ion diffusion. This porous sulfur cathode has a high initial capacity of 1235 mAh g−1 and a high reversible capacity of 626 mAh g−1 after 50 cycles, both of which are higher than that of the normal cathodes with compact structures.