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首页> 外文期刊>International Journal of Electrochemical Science >Hydrothermal Synthesis of Well-dispersed LiMn0.7Fe0.3PO4/C Nanocrystalline Cathodes for Lithium-ion Batteries
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Hydrothermal Synthesis of Well-dispersed LiMn0.7Fe0.3PO4/C Nanocrystalline Cathodes for Lithium-ion Batteries

机译：水热法合成锂离子电池分散良好的LiMn 0.7 Fe 0.3 PO 4 / C纳米晶阴极

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摘要

In this work, LiMn0.7Fe0.3PO4/C composite cathode materials were prepared by hydrothermal processfollowed by carbon-coating. The influence of temperature and the added surfactant CTAB in thehydrothermal process on the structure and electrochemical performance was investigated. The resultsshow that suitable amount of CTAB can reduce the crystal particle growth and improve the particledispersion, while the particles crystallinity is noticeable affected by the hydrothermal temperature. The+sample with higher crystallinity exhibits smaller charge transfer resistance and higher Li diffusioncoefficient, and then better electrochemical performance. Well-dispersed LiMn0.7Fe0.3PO4/Co nanocrystalline particles can be successfully prepared hydrothermally at 180 C with adding of 0.075 g-1 - mL CTAB, and present high capacity and excellent rate capability. Its capacity reaches 156.3 mAh g 1 -1 at 0.2C, and still remains 132.3 mAh g even at 5C.
机译：在这项工作中，LiMn0.7Fe0.3PO4 / C复合阴极材料是通过水热工艺，随后进行碳涂层制备的。研究了水热过程中温度和添加的表面活性剂CTAB对结构和电化学性能的影响。结果表明，适量的CTAB可以减少晶体颗粒的生长并改善颗粒的分散性，而颗粒的结晶度受水热温度的影响明显。具有较高结晶度的+样品表现出较小的电荷转移电阻和较高的Li扩散系数，然后具有更好的电化学性能。加入0.075 g-1-mL CTAB可以在180℃水热成功制备分散良好的LiMn0.7Fe0.3PO4 / Co纳米晶体颗粒，具有高容量和优异的倍率性能。其容量在0.2C时达到156.3 mAh g 1 -1，甚至在5C时仍保持132.3 mAh g。

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