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首页> 外文期刊>Journal of power sources >Synthesis, characterization and application of Li_3Fe_2(PO_4)_3 nanoparticles as cathode of lithium-ion rechargeable batteries
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Synthesis, characterization and application of Li_3Fe_2(PO_4)_3 nanoparticles as cathode of lithium-ion rechargeable batteries

机译：锂离子二次电池正极材料Li_3Fe_2（PO_4）_3的合成，表征及应用

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摘要

This work introduces a new method to synthesize Li_3Fe_2(PO_4)_3 nanoparticles in the nanopowder form and study its electrochemical performance by cyclic voltammetry and battery tests. Li_3Fe_2(PO_4)_3 is synthesized by the gel combustion method based on polyvinyl alcohol (PVA) as gel making agent. The optimum conditions of the synthesis include 8 wt% PVA, 0.34 wt% lithium slat, 1 wt% iron salt, 0.57 wt% ammonium dihydrogen phosphate, ethanol-water 50:50 as solvent, 675 ℃ combustion temperature and 4h combustion time. Characterization of the samples is performed by the scanning electron microscopy (SEM), transmission electron microscopy (TEM), EDX analysis, XRD patterns, BET specific surface area and DSL size distribution. In the optimum conditions, a nanopowder is obtained that consisting of uniform nanoparticles with an average diameter of 70 nm. The optimized sample shows 12.5 m~2 g~(-1) specific surface areas. Cyclic voltammetry (CV) studies show that the synthesized compound has good reversibility and high cyclic stability. The CV results are confirmed by the battery tests. The obtained results show that the synthesized cathodic material has high practical discharge capacity (average 125.5mAhg~(-1) approximately same with its theoretical capacity 128.2 mAh~(-1) and long cycle life.
机译：这项工作介绍了一种新方法来合成纳米粉末形式的Li_3Fe_2（PO_4）_3纳米颗粒，并通过循环伏安法和电池测试研究其电化学性能。 Li_3Fe_2（PO_4）_3是通过以聚乙烯醇（PVA）为制凝胶剂的凝胶燃烧法合成的。最佳合成条件为：PVA含量为8wt％，板条锂含量为0.34wt％，铁盐含量为1wt％，磷酸二氢铵含量为0.57wt％，乙醇-水为50:50的溶剂，燃烧温度为675℃，燃烧时间为4h。通过扫描电子显微镜（SEM），透射电子显微镜（TEM），EDX分析，XRD图，BET比表面积和DSL尺寸分布对样品进行表征。在最佳条件下，获得了由平均直径为70 nm的均匀纳米颗粒组成的纳米粉。优化后的样品的比表面积为12.5 m〜2 g〜（-1）。循环伏安法（CV）研究表明，合成的化合物具有良好的可逆性和较高的循环稳定性。电池测试证实了CV结果。所得结果表明，所合成的阴极材料具有较高的实际放电容量（平均125.5mAhg〜（-1），与理论容量128.2mAh〜（-1）基本相同，循环寿命长。

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