Abstract
LiFe1 − x Sm x PO4/C cathode materials were synthesized though a facile hydrothermal method. Compared with high-temperature solid-phase sintering, the method can allow for the fabrication of low Sm content (2 %), a scarce and expensive rare earth element, while the presence of an optimized carbon coating with large amount of sp2-type carbon sharply increases the material’s electrochemical performance. The high-rate dischargeability at 5 C, as well as the exchange current density, can be increased by 21 and 86 %, respectively, which were attributed to the fine size and the large cell parameter a/c as much. It should be pointed out that the a/c value will be increased for the LiFePO4 Sm-doped papered by both of the two methods, while the mechanism is different: The value c is increased for the front and the value a is decreased for the latter, respectively.
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This work was supported by the Foundation of State Key Laboratory of Rare Earth Resources Utilization (RERU2013021).
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Wang, W., Qiao, Y., He, L. et al. Study on LiFe1 − x Sm x PO4/C used as cathode materials for lithium-ion batteries with low Sm component. Ionics 21, 2119–2125 (2015). https://doi.org/10.1007/s11581-015-1397-z
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DOI: https://doi.org/10.1007/s11581-015-1397-z