Synthesis of LiFePO4/C doped with Mg2+ by reactive extrusion method

Reactive extrusion method is used to synthesizing LiMgxFe1 xPO4/C, using LiOH center dot H2O, FeC2O4 center dot 2H(2)O, P2O5 and nano-MgO as raw materials and glucose as carbon source. Samples are investigated by X-ray diffraction (XRD), scanning electron microscope (SEM), TG-DTA analysis and electrochemical performance test. Results show that amorphous product can be achieved after the reactive extrusion process. The particle size increases with the increase of magnesium content. Appropriately Mg2+ doping can reduce the electrode polarization effectively without seriously effect on material structure and morphology. LiMg0.04Fe0.96PO4/C, showing the best electrochemical performances, has an initial discharge capacity of 155, 148, 140 and 137 mA h g(-1) at 0.2 C, 0.5 C, 1 C and 2 C rate, respectively. The discharge capacities remain above 99% after 20 cycles. (C) 2014 The Society of Powder Technology Japan. Published by Elsevier B.V. and The Society of Powder Technology Japan. All rights reserved.