Effects of different iron sources on the performance of LiFePO4/C composite cathode materials

Journal of University of Science and Technology Beijing, Mineral, Metallurgy, Material Pub Date : 2008-12-01 DOI:10.1016/S1005-8850(08)60291-1

Fei Gao , Zhiyuan Tang , Jianjun Xue

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引用次数: 10

Abstract

Olivine LiFePO₄/C composite cathode materials were synthesized by a solid state method in N₂ + 5vol% H₂ atmosphere. The effects of different iron sources, including Fe(OH)₃ and FeC₂O₄·2H₂O, on the performance of as-synthesized cathode materials were investigated and the causes were also analyzed. The crystal structure, the morphology, and the electrochemical performance of the prepared samples were characterized by X-ray diffractometry (XRD), scanning electron microscopy (SEM), laser particle-size distribution measurement, and other electrochemical techniques. The results demonstrate that the LiFePO₄/C materials obtained from Fe(OH)₃ at 800°C and FeC₂O₄·2H₂O at 700°C have the similar electrochemical performances. The initial discharge capacities of LiFePO₄/C synthesized from Fe(OH)₃ and FeC₂O₄·2H₂O are 134.5 mAh·g⁻¹ and 137.4 mAh·g⁻¹ at the C/5 rate, respectively. However, the tap density of the LiFePO₄/C materials obtained from Fe(OH)₃ are higher, which is significant for the improvement of the capacity of the battery.

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不同铁源对LiFePO4/C复合正极材料性能的影响

采用固相法在N2 + 5vol% H2气氛下合成了橄榄石LiFePO4/C复合正极材料。考察了不同铁源(Fe(OH)3)和FeC2O4·2H2O)对合成正极材料性能的影响，并分析了影响的原因。采用x射线衍射(XRD)、扫描电镜(SEM)、激光粒度分布测量等电化学技术对制备样品的晶体结构、形貌和电化学性能进行了表征。结果表明，800℃Fe(OH)3和700℃FeC2O4·2H2O制备的LiFePO4/C材料具有相似的电化学性能。在C/5倍率下，Fe(OH)3和FeC2O4·2H2O合成的LiFePO4/C的初始放电容量分别为134.5 mAh·g−1和137.4 mAh·g−1。而由Fe(OH)3制备的LiFePO4/C材料的抽头密度较高，这对电池容量的提高具有重要意义。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Journal of University of Science and Technology Beijing, Mineral, Metallurgy, Material

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