▎ 摘　　要

In this work, a three-dimensional porous composite (S/RGO@NPC) is prepared by graphene (RGO) coated nitrogen-rich porous carbon (NPC) and combined with sulfur. The doping of nitrogen and porous structure can alleviate the shuttling effect through chemical and physical double adsorption of polysulfide, respectively. RGO coating restricts the movement of polysulfide, further alleviates the shuttling effect, and also improves the electrical conductivity. Our results show when the sulfur content is 70% with a loading up to 3 mg/cm(2), the Li-S battery with S/RGO@NPC as cathode still shows good capacity (880.8mAh/g at 0.5C), and superior cycle stability (capacity retention of 68.1% after 400 cycles at 0.5C).