Abstract
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Particular N, S co-doped graphene/Fe3O4 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 Fe3O4 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/Fe3O4 composite electrode exhibits a high initial reversible capacity of
1362.2 mAhg−1, a high reversible specific capacity of 1055.20 mAhg−1 after 100 cycles, and excellent
cycling stability and rate capability, with specific capacity of 556.69 mAhg−1 when cycled at the current
density of 1000 mAg−1, indicating that the N-S-G/Fe3O4 composite is a promising anode candidate for
Li-ion batteries.