Conductive WO3-x@CNT networks for efficient Li-S batteries

Abstract

Oxygen-vacancy-containing WO3-x nanodots homogeneously decorated on conductive CNT networks (WO3-x@CNT) have been synthesized by a simple and industrial spray-drying approach followed by annealing. Benefiting from the enhanced conductivity of CNT networks and the effective absorption for polysulfides by ultra-small polar WO3-x nanodots, the designed WO3-x@CNT/S cathode demonstrates excellent electrochemical performance, with an excellent rate capability (1000.1 and 518.2 mAh g -1 at 0.2 and 3 C, respectively), a high reversible specific capacity of 754.1 mAh g-1 at 1 C after 50 cycles.