Ultrafine hollow Fe3O4 anode material modified with reduced graphene oxides for high-power lithium-ion batteries

In this work, a composite material consisting of ultrafine Fe3O4 with (ca. 15 nm) uniformly anchored in reduced graphene oxides (rGO) is synthesized and reported to be applied in anodes for lithium-ion battery. The obtained hollow Fe3O4 /rGO composites (H-Fe3O4/rGO) (827.3 mA h g(-1)) has much superior specific capacity than that of the solid Fe3O4/rGO composites (S-Fe3O4/rGO) (654.9 mA h g(-1)) after 550 cycles of the coin cell at 0.5 A g(-1). Even if the cells are tested at 1 A g(-1), H-Fe3O4/rGO displays a remarkable specific capacity of 917.4 mA h g(-1) as well as the capacity retention rate of 56.7%, compared with S-Fe3O4/rGO (573.9 mA h g(-1), the capacity retention rate of 37.7%). Such a sufficient cyclic stability and rate capability in the H-Fe3O4/rGO composite is mainly attributed to the ultrafine hollow structure for shortening Li+ diffusion path and conductive rGO beneficial to rapid electron transfer. (C) 2021 Elsevier B.V. All rights reserved.