EBSD-coupled indentation: nanoscale mechanics of lithium metal
EBSD-coupled indentation: nanoscale mechanics of lithium metal
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DOI：
10.1016/j.mtener.2022.101183
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发表时间：
2022-11-18
影响因子：
9.3
通讯作者：
Pasta, Mauro
中科院分区：
文献类型：
--
作者：
Aspinall, Jack;Armstrong, David E. J.;Pasta, Mauro
陶瓷固体电解质的断裂，由裂纹内的锂电镀驱动，已被确定为成功开发固态电池的基本问题之一。因此，了解纳米级锂的力学是至关重要的。在这项工作中，锂的弹性和塑性特性是通过电子显微镜内的纳米压痕测量的。锂金属样品的特征在于电子背散射衍射压痕之前和之后，以理解晶体取向的机械性能的依赖性，并确定刚度张量分量，模量，和泊松比使用的方法首先提出的Vlassak和Nix。测得的刚度张量分量为C11 = 13.3，C12 = 11.2和C44 = 8.8 GPa。硬度测量显示出明显的尺寸效应，对于低于300 nm的拉伸深度观察到超过100 MPa的硬度，这可能有助于观察到的锂丝传播。(c)2022作者。由爱思唯尔有限公司出版。这是一篇开放获取的文章，使用CC BY许可证（http：//creativecommons.org/licenses/by/4.0/）。
The fracture of ceramic solid electrolytes, driven by the plating of lithium within cracks, has been identified as one of the fundamental issues to successfully develop solid-state batteries. Understanding the mechanics of lithium at the nanoscale is therefore essential. In this work, the elastic and plastic properties of lithium are measured by nanoindentation within an electron microscope. Lithium metal samples are characterized by electron backscattered diffraction before and after indentation to under-stand the dependence of the mechanical properties on crystallographic orientation and determine the stiffness tensor components, moduli, and Poisson's ratio using a method first proposed by Vlassak and Nix. The measured stiffness tensor components are C11 = 13.3, C12 = 11.2, and C44 = 8.8 GPa. Hardness measurements show a clear size effect with hardness in excess of 100 MPa observed for indent depths below 300 nm, which could contribute toward observed lithium filament propagation. (c) 2022 The Author(s). Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).