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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Preparation and characterization of LiFe_(0.975)Rh _(0.025)PO_4 nanorods using the hydrothermal method
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Preparation and characterization of LiFe_(0.975)Rh _(0.025)PO_4 nanorods using the hydrothermal method

机译：水热法制备LiFe_（0.975）Rh_（0.025）PO_4纳米棒及其表征

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摘要

An effective method for the synthesis of LiFe_(0.975)Rh _(0.025)PO_4 nanorods to serve as a cathode material for lithium-ion batteries is described. During their preparation, l-lysine was used as the growth director of nanorods. The contribution from chloride ions to the formation of the unique nanorods was also investigated. The samples were characterized using X-ray diffraction, X-ray photoelectron spectroscopy, M?ssbauer measurements, scanning electron microscopy, electronic conductivity measurements, and transmission electron microscopy. The pH of the solution played a key role in controlling the particle size of the samples. The sample prepared at a pH of 9.5 exhibited excellent electrochemical performance. It delivered an initial discharge capacity of 143.1 mAh g~(-1), and a capacity fade of only 7.7% was observed after 200 cycles at 2.5 C over a voltage range of 2.0-4.2 V. Furthermore, its discharge capacity remained stable for values as high as 20 C. The excellent electrochemical performance of LiFe _(0.975)Rh~(0.025)PO_4 nanorods can be attributed their unique nanorod structure, which limits the distance of lithium ion diffusion in the electrode material to the radius of the nanorods and decreases the surface-film resistance for the charge-transfer process.
机译：描述了一种有效的合成LiFe_（0.975）Rh_（0.025）PO_4纳米棒以用作锂离子电池正极材料的方法。在制备过程中，赖氨酸被用作纳米棒的生长导向剂。还研究了氯离子对独特纳米棒形成的贡献。使用X射线衍射，X射线光电子能谱，Msssbauer测量，扫描电子显微镜，电子电导率测量和透射电子显微镜对样品进行表征。溶液的pH在控制样品的粒径方面起着关键作用。在9.5的pH值下制备的样品表现出优异的电化学性能。它的初始放电容量为143.1 mAh g〜（-1），在2.0 C和2.5-V的电压范围内于200 C循环200次后，其容量衰减仅为7.7％。 LiFe _（0.975）Rh〜（0.025）PO_4纳米棒的出色电化学性能可以归因于其独特的纳米棒结构，这限制了锂离子在电极材料中扩散的距离到纳米棒的半径并降低了电荷转移过程的表面膜电阻。

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