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首页> 外文期刊>Journal of power sources >Effect of synthesis conditions on the properties of LiFePO_4 for secondary lithium batteries
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Effect of synthesis conditions on the properties of LiFePO_4 for secondary lithium batteries

机译：合成条件对二次锂电池LiFePO_4性能的影响

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摘要

LiFePO_4 is one of the promising materials for cathode of secondary lithium batteries due to its high energy density, low cost, environmental friendliness and safety. However, LiFePO_4 has very poor electronic conductivity (approx 10~(-9) S cm~(-1)) and Li-ion diffusion coefficient (approx 1.8 X 10~(-14) cm~2 s~(-1)) at room temperature. In an attempt to improve electrochemical properties, Li_xFePO_4 with various amounts of Li contents were investigated in this study. Li_xFePO_4 (X= 0.7-1.1) samples were synthesized by solid-state reaction. High resolution X-ray diffraction, Rietveld analysis, BET, scanning electron microscopy, and hall effect measurement system were used to characterize these samples. Electronic conductivities of the samples with Li-deficient and Li-excess in Li_xFePO_4 were 10~(-3) to 10~(-1) S cm~(-1). Discharge capacities and rate capabilities of the samples with Li-deficient and Li-excess in Li_xFePO_4 were higher than those of stoichiometric LiFePO_4 sample. Li_(0.9)FePO_4 samples fired at 700 deg C had discharge capacity of 156 and 140 mAh g~(-1) at 0.1 C- and 2 C-rate, respectively.
机译：LiFePO_4具有高能量密度，低成本，环保和安全性，是用于二次锂电池正极的有前途的材料之一。但是，LiFePO_4的电子电导率（约10〜（-9）S cm〜（-1））和锂离子扩散系数（约1.8 X 10〜（-14）cm〜2 s〜（-1））非常差。在室温下。为了改善电化学性能，在本研究中研究了具有不同含量的Li的Li_xFePO_4。通过固态反应合成了Li_xFePO_4（X = 0.7-1.1）样品。高分辨率X射线衍射，Rietveld分析，BET，扫描电子显微镜和霍尔效应测量系统被用来表征这些样品。 Li_xFePO_4中Li不足和Li过量的样品的电导率为10〜（-3）至10〜（-1）S cm〜（-1）。 Li_xFePO_4中的Li不足和Li过量的样品的放电容量和倍率能力高于化学计量的LiFePO_4样品。在700℃下燃烧的Li_（0.9）FePO_4样品在0.1 C和2 C速率下的放电容量分别为156和140 mAh g〜（-1）。

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