| 초록 |
It is necessary to synthesize Olivine-type cathode materials with high energy densities and high voltage for lithium ion batteries. Among many Olivine-type cathode materials, LiMn0.5Fe0.5PO4 cathode material is one of the promising candidates due to relatively high potential of Mn3+/Mn2+ redox couple at 4.1V vs. Li/Li+, leading to higher energy density. Here, we are proposing a reaction route that can simply synthesize by solid-state reaction of FePO4•2H2O (Meta-strengite I), LiOH·2H2O, MnCO3, (NH4)2HPO4 and additional sucrose as the carbon source to improve electrical conductivity. Finally, we succeeded in synthesizing the high crystallized Olivine-type nanostructured powders LiMn0.5Fe0.5PO4/C. The samples were characterized by X-ray diffraction (XRD), scanning electronic microscopy (SEM) and coupled plasma optical emission spectroscopy (ICP-OES). The electrochemical properties of the LiMn0.5Fe0.5PO4/C cathode material were invested by galvanostatic charge and discharge modes. Our LiMn0.5Fe0.5PO4/C cathode materials deliver a maximum discharge capacity of 162.31 mAh g-1 at C-rate of 0.1, at 55 °C |
