Porous α-Fe2O3 nanoparticles encapsulated within reduced graphene oxide as superior anode for lithium-ion battery

Abstract

A facile route for the controllable synthesis of porous α-Fe₂O₃ supported by three-dimensional reduced graphene oxide (rGO) is presented. The synergistic effect between α-Fe₂O₃ and rGO can increase the electrolyte infiltration and improve lithium ion diffusion as well. Moreover, the combination of rGO nanosheets can increase the available surface area to provide more active sites and prevent α-Fe₂O₃ nanoparticles from agglomeration during the cycling process to ensure its long-term cycle performance. Consequently, the α-Fe₂O₃/rGO nanocomposites exhibit higher reversible specific capacity (1418.2 mAh g^-1 at 0.1 A g^-1), better rate capability (kept 804.5 mAh g^-1 at 5.0 A g^-1) and cycling stability than the α-Fe₂O₃ nanoparticles. Owing to the superior electrochemical performance, the α-Fe₂O₃/rGO nanocomposites might have a great potential as anode for lithium-ion batteries.