Abstract
In this study, LiFePO 4/C thin films with various contents of carbon were prepared by direct current (DC), radiofrequency (RF) and combined (DC/RF) magnetron sputtering methods. Influences of the composition, morphology and microstructure on the electrochemical properties of LiFePO 4/C thin films are investigated by studying charge–discharge curves, cyclic voltammetry and electrochemical impedance spectroscopy. Cyclic voltammogram of the LiFePO 4/C thin film showed the typical redox reaction peaks characterizing the electrochemical lithium insertion/extraction reactions in LiFePO 4. Obtained LiFePO 4/C thin films have relatively high charge capacities (127 mAh g − 1 ). It was found that optimal magnetron sputtering conditions use a combined CD/RF process to obtain LiFePO 4/C thin films with the best electrochemical performance.
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