Synthesis and electrochemical performance of SnO2-Fe2O3 composite as an anode material for Na-ion and Li-ion batteries

The SnO2-Fe2O3 composite is synthesized by a hydrothermal method in ethanol-water solution. When evaluated as anode materials for Na-ion battery, the SnO2-Fe2O3 composite sample obtained at 400 degrees C could deliver a discharge capacity of 313.1 mAh g(-1) after the 30th cycle at 25 mA g(-1), which corresponds to 104.5% of the 2nd discharge capacity. Coulombic efficiency is 95% in the 30th cycle. At the same time, SnO2-Fe2O3 composite is also an excellent anode material for Li-ion battery, which can deliver initial discharge and charge capacities of 1643 and 1120 mAh g(-1) at 200 mA g(-1), respectively. Such excellent performance is a result of the formation of mesopores and large specific surface area of the SnO2-Fe2O3 composite. (C) 2015 Elsevier B.V. All rights reserved.