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首页> 外文期刊>RSC Advances >Molten salt synthesis of nano-sized Li4Ti5O12 doped with Fe2O3 for use as anode material in the lithiumion battery
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Molten salt synthesis of nano-sized Li4Ti5O12 doped with Fe2O3 for use as anode material in the lithiumion battery

机译：掺杂Fe2O3的纳米Li4Ti5O12熔融盐合成用作锂离子电池的负极材料

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摘要

A single-phase Li4Ti5-xFexO12 (x-0, 0.1, 0.2, 0.3) with spinel structure has been synthesized in LiCl-KCl molten salts with a stoichiometric molar ratio of 4:5:x/2:20 LiOH center dot H2O, TiO2, Fe2O3, LiCl-KCl (x=0, 0.1, 0.2, 0.3). The effects of Fe2O3 on the phase structure, morphology and particle size of Li4Ti5O12 were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM) and transmission electron microscope (TEM) equipped with energy dispersive spectroscope (EDS). The electrochemical performances of the Li4Ti5-xFexO12 were characterized by charge/discharge curves, electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV). The results show that Fe2O3 homogenously distributes in the crystal lattice of Li4Ti5O12 and slightly increases the lattice parameters due to Fe3+ ion doping. The addition of 0.1 molar ratio Fe2O3 to Li4Ti5O12 reduced the average particle size of Li4Ti5O12 from 1 mm to about 200 nm. The obtained Li4Ti4.8Fe0.2O12 was used as anode material for a lithium-ion battery, presenting the capacity of 173.7 mA h g(-1) at 0.2 C-approaching the theoretical capacity of Li4Ti5O12 (175 mA hg(-1))-and giving a capacity of 103.4 mA h g(-1) at 10 C, much larger than the value of pure Li4Ti5O12 (28.7 mA h g(-1)). This is well explained by the EIS and CV results.
机译：已在化学计量摩尔比为4：5：x / 2：20 LiOH中心点H2O的LiCl-KCl熔融盐中合成了具有尖晶石结构的单相Li4Ti5-xFexO12（x-0、0.1、0.2、0.3）， TiO2，Fe2O3，LiCl-KCl（x = 0，0.1，0.2，0.3）。用X射线衍射（XRD），扫描电子显微镜（SEM）和配备能谱仪（EDS）的透射电子显微镜（TEM）表征了Fe2O3对Li4Ti5O12相结构，形貌和粒径的影响。 Li4Ti5-xFexO12的电化学性能通过充电/放电曲线，电化学阻抗谱（EIS）和循环伏安法（CV）表征。结果表明，Fe2O3均匀分布在Li4Ti5O12的晶格中，并由于Fe3 +离子的掺杂而略微增加了晶格参数。将0.1摩尔比的Fe 2 O 3与Li 4 Ti 5 O 12的添加使Li 4 Ti 5 O 12的平均粒径从1mm​​降低至约200nm。将获得的Li4Ti4.8Fe0.2O12用作锂离子电池的负极材料，在0.2 C下的容量为173.7 mA hg（-1），接近Li4Ti5O12的理论容量（175 mA hg（-1））-在10 C时的容量为103.4 mA hg（-1），比纯Li4Ti5O12的值（28.7 mA hg（-1））大得多。 EIS和CV结果很好地解释了这一点。

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