Coupling transition metal oxides with nanocarbonaceous materials is an effective approach to construct high-efficiency anode materials for lithium-ion batteries (LIBs). In the present study, we demonstrate a novel in-situ redox strategy for facile and cost-effective synthesis of Fe3O4/reduced graphene oxide (Fe3O4/rGO) composites as LIBs anodes. Fe3O4/rGO composites are facilely obtained through redox reaction between highly-oxidized graphene oxide and ferrous salt under basic atmosphere, followed by stabilization treatment ranging from 5 min to 5 h. Well crystallized Fe3O4 nanoparticles with diameters of 10-30 nm are tightly and homogeneously anchored on the flexible graphene substrate. Owing to the distinctive composite nanostructure, including strong integration, homogeneous distribution and surface modification effect, the as-prepared Fe3O4/rGO composites exhibit superior electrochemical lithium-storage performance, especially at high current densities. The Fe3O4/rGO-2h composite delivers a remarkable reversible capacity of 1024 mA h g(-1) at the current density of 1000 mA g(-1), and retains 584 mA h g(-1) at 5000 mA g(-1) even after 450 cycles. It is believed that the study will provide a feasible strategy to facilely produce transition metal oxide/carbon composite electrodes with superior electrochemical performance for LIBs. (C) 2018 Elsevier Ltd. All rights reserved.