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

Abstract

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°C could deliver a discharge capacity of 313.1mAhg−1 after the 30th cycle at 25mAg−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 1120mAhg−1 at 200mAg−1, respectively. Such excellent performance is a result of the formation of mesopores and large specific surface area of the SnO2–Fe2O3 composite.