Carbon nanofibers are in-situ prepared on the surface of LiFePO 4 by chemical vapor deposition, resulting in an "urchin-like" hybrid. The microstructure of the nanocomposite is analyzed by XRD, TEM, SEM and N 2 absorption. TEM images show that the carbon nanofibers are amorphous with less than 100 nanometers in diameter. The specific surface area increase remarkably when carbon nanofibers are in-situ grown on the surface of LiFePO 4. The cycle performance is investigated by galvanostatic charge-discharge tests at different rate. The reversible capacity of LiFePO 4 is improved effectively when carbon nanofibers are oriented on the surface. Compared to the bare LiFePO 4, the discharge capacity of carbon nanofibers@LiFePO 4 increase to 162 mAh g -1 at 0.1 C rate. Electrochemical impedance spectra prove that the orientation of carbon nanofibers is effective to improve the electron conductivity. Cyclic voltammograms display no cathodic peaks for the reaction of Ni catalyst with Li + in the charge-discharge process.
|Number of pages
|International Journal of Electrochemical Science
|Published - 2012
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