▎ 摘　　要

Separator modified with graphene/carbon nanotube composite (G/CNT) is introduced into lithium-sulfur (Li-S) battery to trap and activate the soluble polysulfides. The Li-S battery based on a novel separator allows sulfur cathode to reach a high initial discharge capacity of 1200 mAh. g(-1) at 0.2 C and a reversible capacity of 815 mAh.g(-1) after 100 cycles at 0.5 C, which led to an excellent rate capability (up to 2 C rate) and a high Coulombic efficiency of 99%. In this study, the role of separator modified with G/CNT in the electrochemistry of Li-S batteries was also systematically explored. The electrical conductivity and the special leaf stack structure of G/CNT layer have a synergistic effect in controlling the shuttle effect of polysulfides. Moreover, the G/CNT layer can compensate for the effects of deterioration of the morphology of sulfur cathode.