A novel Fe 3O 4–SnO 2–graphene ternary nanocomposite as an anode material for lithium-ion batteries

Abstract

Fe 3O 4–SnO 2–graphene ternary nanocomposite was firstly synthesized by using a gas–liquid interfacial synthesis approach. The as-prepared nanocomposite was characterized by X-ray diffraction, field emission scanning electron microscopy, and transmission electron microscopy. The scanning electron microscopy and transmission electron microscopy characterization results indicate that Fe 3O 4–SnO 2 nanoparticles were successfully deposited onto the surfaces of graphene sheets during the gas–liquid interfacial reaction process. The electrochemical performances were evaluated by using coin-type cells vs. metallic lithium. The Fe 3O 4–SnO 2–graphene nanocomposite exhibits a high reversible specific capacity of 1198 mAh g −1 in the 115th cycle at a specific current of 100 mA g −1 and good rate capability, even at a high specific current of 2000 mA g −1, the reversible capacity is still as high as 521 mAh g −1. The good electrochemical performance of the Fe 3O 4–SnO 2–graphene nanocomposite can be attributed to the synergistic effect existing not only between the graphene and metal oxides but also between the Fe 3O 4 and SnO 2.