Lithium dendrite and solid electrolyte interphase investigation using OsO4
Lithium dendrite and solid electrolyte interphase investigation using OsO4
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DOI：
10.1016/j.jpowsour.2014.04.134
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发表时间：
2014-11
影响因子：
9.2
通讯作者：
M. Zier;F. Scheiba;S. Oswald;Jürgen Thomas;D. Goers;T. Scherer;M. Klose;H. Ehrenberg;J. Eckert
中科院分区：
文献类型：
--
作者：
M. Zier;F. Scheiba;S. Oswald;Jürgen Thomas;D. Goers;T. Scherer;M. Klose;H. Ehrenberg;J. Eckert
四氧化锇（OsO4）染色，通常用于增强散射对比度的电子显微镜的生物组织和聚合物共混物，已被采用的研究石墨阳极的锂离子电池。OsO4显示出与固体电解质中间相（SEI）和锂枝晶的组分的协调反应，从而增加扫描电子显微镜调查的材料对比度。利用锂金属与四氧化锇反应的高亲和力，可以将甚至小的锂沉积物定位在石墨电极上。尽管他们的反应与OsO4烟雾，锂枝晶形态仍然几乎不变的染色程序，提供信息的枝晶生长过程。将检测到的锇的量与放电电极的残余（“死”）锂的量相关联，可以获得锂电镀和剥离效率的实用测量。EDX映射允许电化学剥离的锂枝晶通过其残余染色的SEI壳的本地化。横截面，制备的聚焦离子束（FIB）的循环石墨电极处理与OsO4，揭示了重要的信息，沉积和分布的金属锂和电解质还原层的电极。
Osmium tetroxide (OsO4) staining, commonly used to enhance scattering contrast in electron microscopy of biologic tissue and polymer blends, has been adopted for studies of graphite anodes in lithium-ion batteries. OsO4shows a coordinated reaction with components of the solid electrolyte interphase (SEI) and lithium dendrites, thereby increasing material contrast for scanning electron microscopy investigations. Utilizing the high affinity of lithium metal to react with osmium tetroxide it was possible to localize even small lithium deposits on graphite electrodes. In spite of their reaction with the OsO4fume, the lithium dendrite morphology remains almost untouched by the staining procedure, offering information on the dendrite growth process. Correlating the quantity of osmium detected with the amount of residual (“dead”) lithium of a discharged electrode, it was possible to obtain a practical measure for lithium plating and stripping efficiencies. EDX mappings allowed for a localization of electrochemically stripped lithium dendrites by their residual stained SEI shells. Cross sections, prepared by focused ion beam (FIB) of cycled graphite electrodes treated with OsO4, revealed important information about deposition and distribution of metallic lithium and the electrolyte reduction layer across the electrode.