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首页> 外文期刊>Journal of Materials Research >Neutron reflectometry analysis of Li_4Ti_5O_(12)/organic electrolyte interfaces: characterization of surface structure changes and lithium intercalation properties
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Neutron reflectometry analysis of Li_4Ti_5O_(12)/organic electrolyte interfaces: characterization of surface structure changes and lithium intercalation properties

机译：Li_4Ti_5O_（12）/有机电解质界面的中子反射分析：表面结构变化和锂嵌入特性的表征

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摘要

The structure changes and lithium intercalation properties in the surface region of Li_4Ti_5O_(12) were investigated using epitaxial Li_4Ti_5O_(12)(111) film model electrodes. The discharge-charge measurements, which were conducted with 1 mol/dm~3 LiPF6-containing propylene carbonate, revealed that a 23.8 nm-thick film exhibited a small capacity of 115 mA h/g compared to the theoretical value of 175 mA h/g. In situ neutron reflectometry and ex situ x-ray diffractometry and reflectometry indicated that an irreversible phase change had occurred in the 10-nm surface region of Li_4Ti_5O_(12) during the initial reaction processes. The level of deterioration of the surface structure was significantly reduced by decreasing the LiPF_6 concentration; in addition, side reactions of the cell components with the electrolyte species, and their products, may be associated with the deterioration of the Li_4Ti_5O_(12) surface. The surface reactions have a significant impact on the capacity of lithium intercalation in nano-sized Li_4Ti_5O_(12).
机译：使用外延Li_4Ti_5O_（12）（111）薄膜模型电极研究了Li_4Ti_5O_（12）表面区域的结构变化和锂嵌入性能。用含1 mol / dm〜3的LiPF6的碳酸亚丙酯进行的放电测量表明，厚23.8 nm的薄膜的电容量为115 mA h / g，而理论值为175 mA h / g。 G。原位中子反射仪，异位X射线衍射仪和反射仪表明，在初始反应过程中，Li_4Ti_5O_（12）的10 nm表面区域发生了不可逆的相变。通过降低LiPF_6的浓度可以显着降低表面结构的劣化程度。另外，电池组件与电解质种类及其产物的副反应可能与Li_4Ti_5O_（12）表面的劣化有关。表面反应对纳米Li_4Ti_5O_（12）中锂的嵌入容量有重大影响。

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  • 来源
    《Journal of Materials Research》 |2016年第20期|3142-3150|共9页
  • 作者

    Masaaki Hirayama; Takumi Shibusawa; Ryo Yamaguchi; KyungSu Kim; Sou Taminato; Norifumi L. Yamada; Masao Yonemura; Kota Suzuki; Ryoji Kanno;

  • 作者单位

    Department of Chemical Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology, Midori-ku, Yokohama 226-8502, Japan;

    Department of Chemical Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology, Midori-ku, Yokohama 226-8502, Japan;

    Department of Chemical Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology, Midori-ku, Yokohama 226-8502, Japan;

    Department of Chemical Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology, Midori-ku, Yokohama 226-8502, Japan;

    Department of Chemical Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology, Midori-ku, Yokohama 226-8502, Japan;

    Neutron Science Division, Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), Tokai, Ibaraki 319-1106, Japan;

    Neutron Science Division, Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), Tokai, Ibaraki 319-1106, Japan;

    Department of Chemical Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology, Midori-ku, Yokohama 226-8502, Japan;

    Department of Chemical Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology, Midori-ku, Yokohama 226-8502, Japan;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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