▎ 摘　　要

Sulfur-functionalized graphene monoliths with a high sulfur fraction (16.8 wt%) were prepared to demonstrate a high capacity (similar to 400 mA h g(-1) at 0.1 A g(-1)) and ultrafast (similar to 120 mA h g(-1) at 5 A g(-1)) sodium ion storage. The reversible reaction of -C-S-x-C- with sodium ions contributes to the extra capacity while a 3D graphene network guarantees high rate capability.