One-step Liquid Phase Synthesis of LiFePO4@C Composite as High Performance Cathode Material for Lithium-ion Batteries

A novel and economical one-step liquid phase route combining the liquid phase reaction with rotary evaporation is successfully adopted to prepare LiFePO 4 @C composite materials using iron phosphate dihydrate as iron source and phosphorus source. High temperature sintering was used to complete carbonization and control the size of precursor particles. X-ray diffraction (XRD) shows that all diffraction peaks are consistent of the standard pattern of FePO 4 2H 2 O and orthorhombic LiFePO 4 . The structural characterization and micro-morphology of FePO 4 2H 2 O and as-prepared LiFePO 4 @C are performed by the scanning electron microscopy (SEM) and transmission electron microscopy (TEM) images. The FePO 4 2H 2 O has the morphology of nano-flake particles with good dispersion. After carbon coating, LiFePO 4 @C composite with mean carbon thickness of about 3[Formula: see text]nm exhibits a high discharge capacity of [Formula: see text] at 0.2[Formula: see text]C and [Formula: see text] at 10[Formula: see text]C. This method provides a simple, economic and environmentally friendly way to prepare LiFePO 4 @C cathode material for lithium-ion battery.