Abstract
Li 0.97Na0.03FePO4/C composite cathode material was prepared by a simple wet chemistry- carbothermal reduction method using Fe(NO3)3, LiNO3, NH4H2PO4 and NaNO3 as starting materials. The structure and charging-discharging rate properties of the samples were studied by X-ray diffraction (XRD), scanning electron microscope (SEM) and charge-discharge test. Furthermore, the kinetics of lithium-ion ex- traction and insertion at LiFePO4/C were evaluated from cyclic voltammetry (CV) curves and electrochemi- cal impedance spectroscopy (EIS). The results indicate that the Li0.97Na0.03FePO4 solid-solution with olivine structure is obtained. Na-doping enlarges one-dimensional lithium-ion diffusion pathway in the olivine structure. Consequently, the materials exhibit a decrease in the charge transfer resistance by 67% and an in- crease in the lithium-ion diffusion coefficient by 3~ 4 times. The initial discharge capacities of Li0.97Na0.03FePO4/C sample at the rate of 0.1 C and 2 C are 152 mAhg -1
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