Effect of Fe2P in LiFePO4/Fe2P composite on electrochemical properties synthesized by MA and control of heat condition

In order to control the size and distribution of the high conductive Fe2P in LiFePO4/Fe2P composite, two different cooling rates (Fast: 15 °C·min−1, Slow: 2 °C·min−1) were employed after mechanical alloying. The discharge capacity of the fast cooled was 83 mAh·g−1 and the slow cooled 121 mAh·g−1. The particle size of the synthesized powder was examined by transmission electron microscopy and distribution of Fe2P was characterized using scanning electron microscopy (SEM). In addition, two-step heat treatment was carried out for better distribution of Fe2P. X-ray diffraction (XRD) and Rietveld refinement reveal that LiFePO4/Fe2P composite consists of 95.77% LiFePO4 and 4.33% of Fe2P.