Real-time Observation of Deep Lithiation of Tungsten Oxide Nanowires by In Situ Electron Microscopy.
Real-time Observation of Deep Lithiation of Tungsten Oxide Nanowires by In Situ Electron Microscopy.
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DOI：
10.1002/anie.201508112
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发表时间：
2015-10
影响因子：
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通讯作者：
Kuo Qi;Jiake Wei;Muhua Sun;Qianming Huang;Xiaomin Li;Zhi Xu;Wenlong Wang;X. Bai
中科院分区：
文献类型：
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作者：
Kuo Qi;Jiake Wei;Muhua Sun;Qianming Huang;Xiaomin Li;Zhi Xu;Wenlong Wang;X. Bai
对氧化钨（WO3）电化学锂化过程的深入机理理解既具有根本意义，又与潜在应用相关。WO3锂化最重要的特征之一是形成化学柔性的非化学计量比Lix WO3，称为钨青铜。在此，我们通过构建原位透射电子显微镜（TEM）电化学池，实现了对单晶WO3纳米线深度电化学锂化过程的实时观察。正如纳米成像，衍射和光谱所揭示的，它表明，WO3纳米线的快速和深锂化导致高度无序和近无定形Lix WO3相的形成，但没有可检测到的痕量元素W和隔离的Li2 O相的形成。这些结果突出了Lix WO3相在适应快速和深度锂化反应方面的显著化学和结构灵活性。
An in-depth mechanistic understanding of the electrochemical lithiation process of tungsten oxide (WO3 ) is both of fundamental interest and relevant for potential applications. One of the most important features of WO3 lithiation is the formation of the chemically flexible, nonstoichiometric Lix WO3 , known as tungsten bronze. Herein, we achieved the real-time observation of the deep electrochemical lithiation process of single-crystal WO3 nanowires by constructing in situ transmission electron microscopy (TEM) electrochemical cells. As revealed by nanoscale imaging, diffraction, and spectroscopy, it is shown that the rapid and deep lithiation of WO3 nanowires leads to the formation of highly disordered and near-amorphous Lix WO3 phases, but with no detectable traces of elemental W and segregated Li2 O phase formation. These results highlight the remarkable chemical and structural flexibility of the Lix WO3 phases in accommodating the rapid and deep lithiation reaction.