Hierarchically-porous carbon nano sheets were prepared as a conductive additive for sulfur/polyacrylonitrile(S/PAN)composite cathodes using a simple heat treatment.In this study,kombucha(that was derived from symbioti...Hierarchically-porous carbon nano sheets were prepared as a conductive additive for sulfur/polyacrylonitrile(S/PAN)composite cathodes using a simple heat treatment.In this study,kombucha(that was derived from symbiotic culture of bacteria and yeast)carbon(KC)and graphene oxide(GO)were used as a carbon host matrix.These rational-designed S/PAN/KC/GO hybrid composites greatly suppress the diffusion of polysulfides by providing strong physical and chemical adsorption.The cathode delivered an initial discharge capacity of 1652 mAh·g^-1 at a 0.1 C rate and a 100th cycle capacity of 1193 mAh·g^-1.The nano sheets with embedded hierarchical pores create a conductive network that provide effective electron transfer and fast electrochemical kinetics.Further,the nitrogen component of PAN can raise the affinity/interaction of the carbon host with lithium polysulfides,supporting the cyclic performance.The results exploit the cumulative contribution of both the conductive carbon matrix and PAN in the enhanced performance of the positive electrode.展开更多
基金All the authors from Alagappa University acknowledge the financial support by DST-SERB,New Delhi under the Physical sciences,grant sanctioned vide EMR/2016/006302
文摘Hierarchically-porous carbon nano sheets were prepared as a conductive additive for sulfur/polyacrylonitrile(S/PAN)composite cathodes using a simple heat treatment.In this study,kombucha(that was derived from symbiotic culture of bacteria and yeast)carbon(KC)and graphene oxide(GO)were used as a carbon host matrix.These rational-designed S/PAN/KC/GO hybrid composites greatly suppress the diffusion of polysulfides by providing strong physical and chemical adsorption.The cathode delivered an initial discharge capacity of 1652 mAh·g^-1 at a 0.1 C rate and a 100th cycle capacity of 1193 mAh·g^-1.The nano sheets with embedded hierarchical pores create a conductive network that provide effective electron transfer and fast electrochemical kinetics.Further,the nitrogen component of PAN can raise the affinity/interaction of the carbon host with lithium polysulfides,supporting the cyclic performance.The results exploit the cumulative contribution of both the conductive carbon matrix and PAN in the enhanced performance of the positive electrode.
