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Operando structural study of non-aqueous Li-air batteries using synchrotron-based X-ray diffraction

机译：使用同步基于同步辐射的X射线衍射非水锂气体的Operando结构研究

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摘要

Non-aqueous lithium-air batteries (LABs) attract attention as a candidate technology for next-generation energy storage devices. It is crucial to understand how the discharge product Li2O2 is formed and decomposed by the electrochemical reactions to improve the cycle performance and decrease the charge voltage, which are the most important subjects for LAB development. Here, operando X-ray diffraction with high-brilliant X-rays in a transmission mode was used to observe the intensity and structural changes of crystalline Li2O2 in an operating non-aqueous LAB in real time, and the Li-O-2 electrochemical reaction involving Li2O2 formation and decomposition was clearly demonstrated. The electrochemically formed Li2O2, which had an anisotropic domain size of 10 nm in the c-direction and 40-70 nm in the ab-plane, grew due to the increase of the number of domains during the discharge process. No other reaction products with a crystalline phase such as LiOH were found in either the cathode or anode of the LAB, whereas the accelerated decomposition rate of the domains was accompanied with the change of the domain shape and lattice constant of the c-axis in the latter half of the charge process with voltage higher than 4 V.
机译：非锂空气电池（实验室）吸引注意力作为下一代储能设备的候选技术。对于了解放电产品Li2O2，通过电化学反应来改善循环性能并降低充电电压是至关重要的，这是至关重要的，这是实验室开发的最重要科目的循环性能并降低电荷电压。这里，在变速器模式中具有高亮X射线的操作yando X射线衍射用于实时观察结晶Li2O2在操作非水实验室中的结晶Li2O2的强度和结构变化，以及Li-O-2电化学反应清楚地证明了Li2O2的形成和分解。电化学形成的Li 2 O 2在C方向上具有10nm的各向异性结构域尺寸和40-70nm在Ab平面中，由于放电过程中的域的数量的增加而增长。在实验室的阴极或阳极中没有发现具有诸如LiOH的结晶相的其他反应产物，而域的加速分解速率伴随着C轴的畴形状和晶格常数的变化电压的后半部分电压高于4 V.

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  • 来源
    《RSC Advances》 |2018年第46期|共7页
  • 作者

    Song Chulho; Ito Kimihiko; Sakata Osami; Kubo Yoshimi;

  • 作者单位

    NIMS Global Res Ctr Environm &

    Energy Based Nanomat Sc 1-1 Namiki Tsukuba Ibaraki 3050044 Japan;

    NIMS Global Res Ctr Environm &

    Energy Based Nanomat Sc 1-1 Namiki Tsukuba Ibaraki 3050044 Japan;

    NIMS Global Res Ctr Environm &

    Energy Based Nanomat Sc 1-1 Namiki Tsukuba Ibaraki 3050044 Japan;

    NIMS Global Res Ctr Environm &

    Energy Based Nanomat Sc 1-1 Namiki Tsukuba Ibaraki 3050044 Japan;

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