▎ 摘　　要

Lithium-sulfur batteries have attracted wide research interest due to their high specific capacity (1675 mA h g(-1)) and high specific energy (2500 W h kg(-1)). Herein, the two-dimensional nitrogen/sulfur synchronous-doped few-layer graphene (N, S-FLG) was prepared by a simple calcination route at 900 degrees C under an argon atmosphere with g-C3N4 as a structural template. The calcination temperature favorably adjusted the doping levels and surface texture of the as-obtained samples. Relying on the synergistic interaction of the structural traits, as the reservoir of sulfur, NS-FLG-900 (calcination temperature 900 degrees C) can maintain a reversible capacity of 602 mA h g(-1) after 300 cycles at a current density of 0.8 A g(-1) and 506.4 mA h g(-1) after 500 cycles at a current density of 1.6 A g(-1). The outstanding performance is obtained due to the synergistic effect of the introduction of N and S into the carbon lattice, the high pore volume (1.31 cm(3) g(-1)) and large specific surface area (460.9 m(2) g(-1)).