High-Performance Anode Materials with Superior Structure of Fe3O4/FeS/rGO Composite for Lithium Ion Batteries

In this work, we developed a simple one-step hydrothermal method to successfully prepare Fe 3 O 4 /FeS-reduced graphene oxide (Fe 3 O 4 /FeS/rGO) composite directly, which is a novel Lithium-ion batteries (LIBs) anode material. The characterization of Fe 3 O 4 /FeS/rGO composite demonstrates that octahedral Fe 3 O 4 /FeS particles are uniformly deposited on the rGO, leading to a strong synergy between them. The excellent structural design can make Fe 3 O 4 /FeS/rGO composite to have higher reversible capacity (744.7[Formula: see text]mAh/g at 0.1[Formula: see text]C after 50 cycles), excellent cycling performance and superior rate capability. This outstanding electrochemical behavior can be attributed to the conductivity network of rGO, which improves the composite electrode conductivity, facilitates the diffusion and transfer of ions and prevents the aggregation and pulverization of Fe 3 O 4 /FeS particles during the charging and discharging processes. Moreover, the Fe 3 O 4 /FeS/rGO electrode surface is covered with a thin solid-electrolyte interface (SEI) film and the octahedral structure of Fe 3 O 4 /FeS particles is still clearly visible, which indicates that composite electrode has excellent interface stability. We believe that the design of this composite structure will provide a new perspective for the further study of other transition metal oxides for LIBs.