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首页> 外文期刊>RSC Advances >Synthesis and electrochemical properties of monoclinic fluorine-doped lithium manganese oxide (LixMnO_(2-y)F_y) for lithium secondary batteries
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Synthesis and electrochemical properties of monoclinic fluorine-doped lithium manganese oxide (LixMnO_(2-y)F_y) for lithium secondary batteries

机译：锂二次电池单岩氟掺杂锂锰氧化物（LixmnO_（2-Y）F_y的合成与电化学性能

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摘要

A series of monoclinic fluorine-doped lithium manganese oxide (LixMnO2~yFy) were prepared by the ion exchange of sodium for lithium in NaxMnO2~yFy precursors that were obtained using a high-temperature solid-state reaction. The microstructure and composition of the samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), inductively coupled plasma atomic emission spectroscopy (ICP-AES), ion chromatography (IC), Fourier transform infrared spectroscopy (FTIR), and X-ray photoelectron spectroscopy (XPS). The different valence states of manganese in material LixMnO_(2-y)F_y were determined by redox titration method. The electrochemical performance of these samples as cathode materials were studied by the galvanostatic and cyclic voltammetry method. These materials had a high crystallite size, which was composed of 5-8 mm grains. The Li0.86MnO1.98F0.02 materials delivered an initial discharge capacity of 129.2 mA h g~1 and gradually increased to a maximum discharge capacity of 210 mA h g~1 at a current density of 50 mA g~(-1) after 50 cycles. Moreover, the material showed an excellent cycling behavior, even though its original structure transformed into the spinel phase during cycling. The results show that the partial substitution of monoclinic LiMnO2 with fluorine can improve the cycle stability and high-rate discharge capability of cathode materials.
机译：通过使用高温固态反应获得的纳克马诺2〜YFY前体的锂离子交换，制备一系列单冠状氟掺杂锂锰氧化物（LixmnO2〜Yfy）。样品的微观结构和组成是通过X射线衍射（XRD），扫描电子显微镜（SEM），电感耦合等离子体原子发射光谱（ICP-AES），离子色谱法（IC），傅立叶变换红外光谱（FTIR）和X射线光电子能谱（XPS）。通过氧化还原滴定法测定了材料LixmnO_（2-Y）F_Y中的锰的不同价态。通过Galvanostatic和循环伏安法研究了这些样品的电化学性能作为阴极材料。这些材料具有高微晶尺寸，其由5-8mm颗粒组成。 LI0.86MNO1.98F0.02材料提供初始放电容量为129.2 mA Hg〜1，并在50次循环后，在电流密度为50mA g〜（-1）的最大放电容量为210 mA Hg〜1的最大放电容量。此外，即使其原始结构在循环期间转化为尖晶石相位，材料也显示出优异的循环行为。结果表明，氟的单斜甘油部部分取代可以提高阴极材料的循环稳定性和高速率放电能力。

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  • 来源
    《RSC Advances》 |2015年第109期|共8页
  • 作者

    Yu Zhang; Zhi Su; Xiang Yao;

  • 作者单位

    College of Chemistry and Chemical Engineering Xinjiang Normal University Urumqi 830054 Xinjiang China.;

    College of Chemistry and Chemical Engineering Xinjiang Normal University Urumqi 830054 Xinjiang China.;

    College of Chemistry and Chemical Engineering Xinjiang Normal University Urumqi 830054 Xinjiang China.;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
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