Two-Dimensional Layered BiOX (X = Cl, Br) Compounds as Anode Materials for Lithium-Ion Batteries

Many layered structure nanomaterials have been suggested as promising electrode materials for lithium-ion batteries. Ternary layered compounds, BiOX (X=Cl, Br) are usually used as photocatalysts for energy generation and environmental protection. However, there has not been a report of BiOX as electrode materials for lithium-ion batteries to this point. In this study, two-dimensional BiOX nanosheets are synthesized using a hydrothermal method, and electrochemical measurements show that layered BiOX can display remarkable electrochemical performance for use as an anode in lithium-ion batteries. Capacities of approximately 254 and 230 mAhg(-1) are maintained after 15 cycles at a current density of 500 mAg(-1) for BiOCl and BiOBr, respectively. The electrochemical properties are much better than that of BiOI (137 mAhg(-1)). Study of the mechanism reveals that Li3OX (X=Cl, Br) and Li3Bi are formed after the lithium ions become embedded in the layered BiOX.