Facile Synthesis of LiFePO4/C with High Tap-density as Cathode for High Performance Lithium Ion Batteries

LiFePO4/C cathode materials with a high tap-density originated from FePO4 center dot 2H(2)O precursors were prepared via a high-temperature solid-phase carbothermic reduction using low-cost Ferroferric oxide (Fe3O4) and phosphoric acid (H3PO4) as reaction materials. The as-obtained precursors are consistent with FePO4 center dot 2H2O phase with a Pcab space group and no impurity peaks are detected by XRD. The FePO4 center dot 2H(2)O precursor prepared at 90 degrees C for 8 h and the corresponding LiFePO4/C composite show high tap-density of 1.45 g cm(-3) and 1.36 g cm(-3), respectively. The LiFePO4/C delivers a high initial discharge capacity of 159 mAh g(-1) at 0.1 degrees C. Meanwhile, an initial capacity of 95 mAh g(-1) and superior capacity retention of 96.3 % are retained after 70 cycles at a high rate of 10 degrees C.