Spatially Interlinked Graphene with Uniformly Loaded Sulfur for High Performance Li‐S Batteries

Lithium‐sulfur (Li‐S) batteries have drawn extensive attentions due to their high energy density, environmental friendliness and low cost. In this study, three‐dimensional (3D) graphene/S hybrid (G/S) is prepared by a one‐pot hydrothermal method together with redox reaction between S‐based compound and graphene oxide (GO). G/S has a three dimensional porous structure, where graphene is interconnected with each other forming a 3D conductive network. It demonstrates that the pore structure of G/S can be well controlled by optimizing the drying method of the 3D graphene‐based materials. Freeze drying and evaporation‐induced drying can induce different density and pore structure of G/S. Electrochemical tests illustrate that the resulting hybrid can deliver a specific capacity of 891 mAh·g−1 and 575 mAh·g−1 for the 1st and 100th cycle at a current density of 500 mAh·g−1.