Effects of MoS2 doping on the electrochemical performance of FeF3 cathode materials for lithium-ion batteries

Orthorhombic structure FeF3 was synthesized by a liquid-phase method. The FeF3/MoS2 for the application of cathode material of lithium-ion battery was prepared through mechanical milling with molybdenum bisulfide. The structure and morphology of the FeF3/MoS2 were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The electrochemical behavior of FeF3/MoS2 was studied by charge/ discharge, cyclic voltammetry and electrochemical impedance spectra measurements. The results show that the prepared FeF3/MoS2 was typical orthorhombic structure, uniform surface morphology, better particle-size distribution and excellent electrochemical performances. The initial discharge capacity of FeF3/MoS2 was 169.6 mAh.g(-1) in the voltage range of 2.0-4.5 V, at room temperature and 0.1 C charge-discharge rate. After 30 cycles, the capacity retention is still 83.1%. (C) 2009 Elsevier B.V. All rights reserved.