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首页> 外文期刊>International Journal of Electrochemical Science >Preparation of High Tap Density LiFePO4/C through Carbothermal Reduction Process Using Beta-Cyclodextrin as Carbon Source
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Preparation of High Tap Density LiFePO4/C through Carbothermal Reduction Process Using Beta-Cyclodextrin as Carbon Source

机译：通过使用β-环糊精作为碳源的碳热还原过程制备高敲击密度LiFepo 4 C.

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摘要

As an economical and practical manufacturing process, the carbothermal reduction method is widely used for industrial production of LiFePO4. In this work, an LiFePO4/C cathode material with a high tap density of 1.3 g cm-3 was successfully synthesized through a novel carbothermal reduction process, which used FePO4 as the precursor and beta-cyclodextrin as the carbon source. The prepared samples were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanningelectron microscopy (SEM), transmission electron microscopy (TEM) and Raman spectra. Their electrochemical performance was investigated with a galvanostatic charge/discharge system, cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The SEM and TEM results indicate that LiFePO4/C microspheres with diameters of 5-10 μm aggregated by enormous nanoplates, and they were evenly coated with an amorphous carbon layer approximately 3 nm thick. The electrochemical results show that carbon coating could greatly optimize the electrochemical performance of LiFePO4 owing to the improved electronic conductivity of the sample. Specifically, -1 LiFePO4/C exhibited not only a discharge capacity of 144 mAh g in the initial cycle at 0.1C (1C=170 mAh g-1), but also a superior rate capability an d excellent cycling performance.
机译：作为一种经济实用，实用的制造过程，碳热还原方法广泛用于Lifepo4的工业生产。在这项工作中，通过新的碳热还原过程成功地合成了具有高1.3g cm-3的高振击密度的LiFePO4 / C阴极材料，该方法使用FEPO4作为前体和β-环糊精作为碳源。制备的样品以X射线衍射（XRD），X射线光电子能谱（XPS），扫描电子显微镜（SEM），透射电子显微镜（TEM）和拉曼光谱特征。通过镀锌电荷/放电系统，循环伏安法（CV）和电化学阻抗光谱（EIS）研究了它们的电化学性能。 SEM和TEM结果表明，由巨大纳米板聚集的直径为5-10μm的LiFePO4 / C微球，它们均匀地涂覆有约3nm厚的无定形碳层。电化学结果表明，由于样品的改善的电子电导率，碳涂层可以极大地优化LiFePO4的电化学性能。具体而言，-1 LiFePO4 / C不仅在0.1℃（1C = 170mAh G-1）的初始循环中展出了144mAhg的放电容量，也具有优异的循环性能。

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