| Abstrakt: |
Nanocrystalline LiFePO and LiFeSnPO cathode materials were synthesized by an inorganic-based sol-gel route. The physicochemical properties of samples were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy, transmission electron microscopy, and elemental mapping. The doping effect of Sn on the electrochemical performance of LiFePO cathode material was extensively investigated. The results showed that the doping of tin was beneficial to refine the particle size, increase the electrical conductivity, and facilitate the lithium-ion diffusion, which contributed to the improvement of the electrochemical properties of LiFePO, especially the high-rate charge/discharge performance. At the low discharge rate of 0.5 C, the LiFeSnPO sample delivered a specific capacity of 158 mAh g, as compared with 147 mAh g of the pristine LiFePO. At higher C-rate, the doping sample exhibited more excellent discharge performance. LiFeSnPO delivered specific capacity of 146 and 128 mAh g at 5 C and 10 C, respectively, in comparison with 119 and 107 mAh g for LiFePO. Moreover, the doping of Sn did not influence the cycle capability, even at 10 C. [ABSTRACT FROM AUTHOR] |
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