Electrochemical performance of Mo-doped LiFePO4/C composites prepared by two-step solid-state reaction |
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Authors: | Zhipeng Ma Guangjie Shao Guiling Wang Jianping Du Ying Zhang |
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Affiliation: | 1. College of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao, 066004, China 2. State Key Laboratory of Metastable Materials Science and Technology, Qinhuangdao, 066004, China 3. Hebei Province Key Laboratory of Applied Chemistry, Qinhuangdao, 066004, China
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Abstract: | To improve the performance of LiFePO4, LiFe1?x Mo x PO4/C (x?=?0, 0.005, 0.010, 0.015, 0.020, 0.025) cathode materials were synthesized via two-step ball milling solid-state reaction. The prepared samples were characterized by X-ray diffraction (XRD), field-emission scanning electron microscopy, cyclic voltammetry, electrochemical impedance spectra, and galvanostatic charge–discharge test. It is apparent from XRD analysis that Mo doping enlarges the interplanar distance of crystal plane parallel to [010] direction in LiFePO4. In other words, it widens one-dimensional diffusion channels of Li+ along the [010] direction. The results of electrochemical test indicate that the LiFe0.99Mo0.01PO4/C composite exhibits a discharge capacity of 144.8 mAh g?1 at 1 C rate, a decreased charge transfer resistance of 162.4 Ω and better reversibility of electrode reactions. The present synthesis route is promising and practical for the preparation of LiFePO4 materials. |
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