Composite FeF ₃·3H ₂O/C cathode material for lithium ion battery

Composite FeF ₃·3H ₂O/C was prepared by mixing FeF ₃·3H ₂O with acetylene black through high-energy milling, and used as cathode material for Li-ion battery. The structure and the morphology of the as-prepared composite FeF ₃·3H ₂O/C were investigated by X-ray diffraction (XRD) and scanning electron microscopy (SEM). When compared with FeF ₃·3H ₂O synthesized by a liquid-phase method, the composite FeF ₃·3H ₂O/C had no distinct difference in crystal structure, but shows that a well distributed particle size of 100∼1000nm. The electrochemical performances of FeF ₃·3H ₂O/C composite were evaluated by charge-discharge test and cyclic voltammetery (CV). With a current density of 23.7mAg ^-1 in the voltage range of 2.0∼4.5V at room temperature, the FeF ₃·3H ₂O/C composite achieved a maximum discharge capacity of 112 mAhg ^-1, as well as a good cycling performance.