期刊
NANO LETTERS
卷 18, 期 12, 页码 7583-7589出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.8b03148
关键词
In situ; scanning electron microscope; all-solid Li metal batteries; polymer; dendrite
类别
资金
- Hydro Quebec
- McGill Engineering Doctoral Award (MEDA)
Li metal batteries suffer from dendrite formation which causes short circuit of the battery. Therefore, it is important to understand the chemical composition and growth mechanism of dendrites that limit battery efficiency and cycle life. In this study, in situ scanning electron microscopy was employed to monitor the cycling behavior of all-solid Li metal batteries with LiFePO4 cathodes. Chemical analyses of the dendrites were conducted using a windowless energy dispersive spectroscopy detector, which showed that the dendrites are not metallic lithium as universally recognized. Our results revealed the carbide nature of the dendrites with a hollow morphology and hardness greater than that of pure lithium. These carbide-based dendrites were able to perforate through the polymer, which was confirmed by milling the polymer using focused ion beam. It was also shown that applying pressure on the battery can suppress growth of the dendrites.
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