Tin oxide-titanium oxide/graphene composited as anode materials for lithium-ion batteries

A tin oxide-titanium oxide/graphene (SnO2-TiO2/G) ternary nanocomposite as high-performance anode for Li-ion batteries was prepared via a simple reflux method. The graphite oxide (GO) was reduced to graphene nanosheet, and the SnO2-TiO2 nanocomposites were evenly distributed on the graphene matrix in the SnO2-TiO2/G nanocomposite. The as-prepared SnO2-TiO2/G nanocomposites were employed as anode materials for lithium-ion batteries, showing an outstanding performance with high reversible capacity and long cycle life. The composite delivered a superior initial discharge capacity of 1,594.6 mAh g(-1) and a reversible specific capacity of 1,500.3 mAh g(-1) at a current density of 100 mA g(-1). After 100 cycles, the reversible discharge capacity was still maintained at 1,177.4 mAh g(-1) at a current density of 100 mA g(-1) with a high retained rate of reversible capacity of 73.8 %. The addition of small amount of TiO2 nanoparticles improved the cycling stability and specific capacity of SnO2-TiO2/G nanocomposite, obviously. The results demonstrate that the SnO2-TiO2/G nanocomposite is a promising alternative anode material for practical Li-ion batteries.