Sulfur-doped honeycomb-like carbon with outstanding electrochemical performance as an anode material for lithium and sodium ion batteries

Sulfur-doped honeycomb-like 3D porous carbon (SHC) from bagasse waste is efficiently synthesized using a simple, economically feasible and environmentally friendly approach. SHC, which has a unique porous structure with the coexistence of macro-, meso- and micropore structures, affords facile storage and transport channels for both Li+ and Na+. As an anode material for lithium ion batteries (LIBs), SHC provides a superior electrochemical reversible specific capacity (690.9 mAh g-1 at 0.1 A g-1 after 100 cycles and 229 mAh g-1 after 500 cycles at 5 A g-1). When used as an anode for sodium ion batteries (SIBs), SHC exhibits an excellent reversible specific capacity of 505.8 mAh g-1 at 0.1 A g-1 after 100 cycles and 108 mAh g-1 after 500 cycles at 5 A g-1. This study demonstrates a simple strategy to synthesize SHC with excellent electrochemical performance for LIBs and SIBs from natural waste materials.