期刊
ACS ENERGY LETTERS
卷 6, 期 5, 页码 1719-1728出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.1c00551
关键词
-
类别
资金
- Helmholtz Association
- China Scholarship Council (CSC)
- Alexander von Humboldt Foundation
- Guangdong Basic and Applied Basic Research Foundation [2019A1515111189]
- Natural Science Foundation of SZU [2110270]
- Deutsche Forschungsgemeinschaft (DFG) [MA 5039/4-1, 357753796]
The evolution of morphology and inner structure of Li deposits was investigated using focused ion beam scanning electron microscopy (FIB/SEM) and cryogenic transmission electron microscopy (cryo-TEM), revealing the nucleation and growth mechanism of Li. The differences in structure and composition of solid electrolyte interface (SEI) layers of Li deposits offer insights into the practical application of rechargeable Li-metal batteries.
Limited understanding of the lithium (Li) nucleation and growth mechanism has hampered the implementation of Li-metal batteries. Herein, we unravel the evolution of the morphology and inner structure of Li deposits using focused ion beam scanning electron microscopy (FIB/SEM). Ball-shaped Li deposits are found to be widespread and stack up at a low current density. When the current density exceeds the diffusion-limiting current, bush-shaped deposition appears that consists of Li-balls, Li-whiskers, and bulky Li. Cryogenic transmission electron microscopy (cryo-TEM) further reveals that Li-balls are primarily amorphous, whereas the Li-whiskers are highly crystalline. Additionally, the solid electrolyte interface (SEI) layers of the Li-balls and whiskers show a difference in structure and composition, which is correlated to the underlying deposition mechanism. The revealed Li nucleation and growth mechanism and the correlation with the nanostructure and chemistry of the SEI provide insights toward the practical use of rechargeable Li-metal batteries.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据