Encapsulation of FeO Nanoparticles into N, S co-Doped Graphene Sheets with Greatly Enhanced Electrochemical Performance

Particular N, S co-doped graphene/FeO hybrids have been successfully synthesized by the combination of a simple hydrothermal process and a subsequent carbonization heat treatment. The nanostructures exhibit a unique composite architecture, with uniformly dispersed FeO nanoparticles and N, S co-doped graphene encapsulant. The particular porous characteristics with many meso/micro holes/pores, the highly conductive N, S co-doped graphene, as well as the encapsulating N, S co-doped graphene with the high-level nitrogen and sulfur doping, lead to excellent electrochemical performance of the electrode. The N-S-G/FeO composite electrode exhibits a high initial reversible capacity of 1362.2 mAh, a high reversible specific capacity of 1055.20 mAh after 100 cycles, and excellent cycling stability and rate capability, with specific capacity of 556.69 mAh when cycled at the current density of 1000 mA, indicating that the N-S-G/FeO composite is a promising anode candidate for Li-ion batteries.