Heteroatom dopings and hierarchical pores of graphene for synergistic improvement of lithium–sulfur battery performance

摘要: Lithium–sulfur batteries have attracted wide research interest due to their high specific capacity (1675 mA h g−1) and energy (2500 W 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 °C under an argon atmosphere with g-C3N4 as structural template. The temperature favorably adjusted doping levels surface texture of as-obtained samples. Relying on synergistic interaction traits, reservoir sulfur, NS-FLG-900 (calcination °C) can maintain reversible 602 g−1 after 300 cycles current density 0.8 A 506.4 500 1.6 g−1. outstanding performance is obtained effect introduction N S into carbon lattice, pore volume (1.31 cm3 large area (460.9 m2 g−1).