Abstract
The electrochemical performance of Li3V2(PO4)3/C was investigated at various low temperatures in the electrolyte 1.0 mol dm−3 LiPF6/ethyl carbonate (EC)+diethyl carbonate (DEC)+dimethyl carbonate (DMC) (volume ratio 1:1:1). The stable specific discharge capacity is 125.4, 122.6, 119.3, 116.6, 111.4, and 105.7 mAh g−1 at 26, 10, 0, −10, −20, and −30 °C, respectively, in the voltage range of 2.3–4.5 V at 0.2 C rate. When the temperature decreases from −30 to −40 °C, there is a rapid decline in the capacity from 105.7 to 69.5 mAh g−1, implying that there is a nonlinear relationship between the performance and temperature. With temperature decreasing, R ct (corresponding to charge transfer resistance) increases rapidly, D (the lithium ion diffusion coefficients) decreases sharply, and the performance of electrolyte degenerates obviously, illustrating that the low-temperature electrochemical performance of Li3V2(PO4)3/C is mainly limited by R ct, D Li, and electrolyte.
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Acknowledgement
The authors gratefully acknowledge the financial support of the Knowledge Innovation Project of the Chinese Academy of Sciences (No. 20092A401), the West Light Foundation of the Chinese Academy of Sciences (No. XB200919) and the science and technology projects of Urumqi (No. K111410005).
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Liu, Z., Kang, X., Li, C. et al. Low-temperature behavior of Li3V2(PO4)3/C as cathode material for lithium ion batteries. J Solid State Electrochem 16, 1917–1923 (2012). https://doi.org/10.1007/s10008-011-1584-4
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DOI: https://doi.org/10.1007/s10008-011-1584-4