Abstract
Although LiFePO4/C has been successfully put into practical use in lithium-ion batteries equipped on new energy vehicles, its unsatisfactory low temperature results in poor low performance of lithium-ion batteries, leading to a much smaller continue voyage course at extreme environments with low temperature for electric vehicles. In this paper, the electrochemical performance of the LiFePO4/C prepared by polyol route was investigated at a temperature range from 25 to −20 °C. Compared to commercial ones, as-prepared LiFePO4/C shows a much better low-temperature performance with a reversible capacity of 30 mA h g−1 even at 5 C under −20 °C and a capacity retention of 91.1 % after 100 cycles at 0.1 C under 0 °C. Moreover, high-resolution transmission electron microscopy (HRTEM) revealed that this outstanding performance at low temperatures could be assigned to uniform carbon coating and the nano-sized particles with a highly crystalline structure.
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Acknowledgments
The authors appreciate the financial support from Science and Technology Department of Sichuan Province (2013GZX0145-3) and Laboratory of Precision Manufacturing Technology, CAEP (ZZ14004). We are indebted to Margaret Yau, Cong Wang, Kun Luo, and Yong Jin for their kind help and fruitful discussions.
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Li, S., Liu, X., Liu, G. et al. Highly enhanced low-temperature performances of LiFePO4/C cathode materials prepared by polyol route for lithium-ion batteries. Ionics 23, 19–26 (2017). https://doi.org/10.1007/s11581-016-1818-7
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DOI: https://doi.org/10.1007/s11581-016-1818-7