Direct Observation and Quantitative Analysis of Lithium Dendrite Growth by In Situ Transmission Electron Microscopy
Direct Observation and Quantitative Analysis of Lithium Dendrite Growth by In Situ Transmission Electron Microscopy
复制标题
DOI：
10.1149/1945-7111/abe5ec
复制
发表时间：
2021-02-01
影响因子：
3.9
通讯作者：
Kushima, Akihiro
中科院分区：
文献类型：
--
作者：
Diaz, Megan;Kushima, Akihiro
在这项工作中，一个独特的原位透射电子显微镜技术（TEM）开发，以评估在锂枝晶生长过程中施加在锂金属和电解质界面的机械应力。该方法使得能够直接观察锂沉积过程和量化与锂金属的枝晶生长相关的机械应力。我们成功地观察到纳米尺寸的锂枝晶成核/生长，并量化了其在该过程中的推力。观察到在压应力达到阈值之后生长模式从垂直方向向平行方向（相对于固体电解质表面）的转变。相变应力远低于纳米锂的屈服应力和固体电解质的刚度。通过这项工作获得的基本信息为设计全固态锂电池所需的坚固的固体电解质提供了有用的见解。
In this work, a unique in situ transmission electron microscopy technique (TEM) was developed to evaluate the mechanical stress imposed at the lithium metal and the electrolyte interface during lithium dendrite growth. The method enables a direct observation of the lithium deposition process and the quantification of the mechanical stress associated with the dendritic growth of lithium metal. We successfully observed a nano-sized lithium dendrite nucleation/growth and quantified its pushing force during the process. The transition of the growth mode from a vertical direction to a parallel direction (relative to the solid electrolyte surface) after the compressive stress reached a threshold value was observed. The transition stress was much lower than the yield stress of nano-sized lithium and the stiffness of the solid electrolyte. The fundamental information obtained by this work gives useful insight towards designing a robust solid electrolyte necessary for all-solid-state lithium batteries.