Low-temperature behavior of Li3V2(PO4)3/C as cathode material for lithium ion batteries
作者： Zhiqiang Liu , Xueya Kang , Chengfeng Li , Ning Hua , Tuerdi Wumair
DOI: 10.1007/S10008-011-1584-4
关键词: Electrochemistry 、 Diethyl carbonate 、 Diffusion 、 Lithium vanadium phosphate battery 、 Chemistry 、 Dimethyl carbonate 、 Electrolyte 、 Lithium-ion battery 、 Lithium 、 Inorganic chemistry
摘要: 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 (DEC)+dimethyl (DMC) (volume ratio 1:1:1). stable specific discharge capacity is 125.4, 122.6, 119.3, 116.6, 111.4, and 105.7 mAh g−1 26, 10, 0, −10, −20, −30 °C, respectively, voltage range 2.3–4.5 V 0.2 C rate. When temperature decreases from −30 to −40 °C, there a rapid decline 105.7 69.5 mAh g−1, implying that nonlinear relationship between temperature. With decreasing, R ct (corresponding charge transfer resistance) increases rapidly, D (the lithium ion diffusion coefficients) sharply, degenerates obviously, illustrating low-temperature mainly limited by ct, D Li, electrolyte.
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