Blade-Type Reaction Front in Micrometer-Sized Germanium Particles during Lithiation

To investigate the lithium transport mechanism in micrometer-sized germanium (Ge) particles, in situ focused ion beam–scanning electron microscopy was used to monitor the structural evolution of individual Ge particles during lithiation. Our results show that there are two types of reaction fronts d...

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Bibliographic Details
Published in:ACS applied materials & interfaces 2020-10, Vol.12 (42), p.47574-47579
Main Authors: Zhou, Xinwei, Li, Tianyi, Cui, Yi, Meyerson, Melissa L, Weeks, Jason A, Mullins, C. Buddie, Jin, Yang, Shin, Hosop, Liu, Yuzi, Zhu, Likun
Format: Article
Language:English
Subjects:
blade-type
ENERGY STORAGE
Energy, Environmental, and Catalysis Applications
germanium
in situ focused ion beam-scanning electron microscopy
lithiation
Lithium ion battery
reaction front
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Summary:To investigate the lithium transport mechanism in micrometer-sized germanium (Ge) particles, in situ focused ion beam–scanning electron microscopy was used to monitor the structural evolution of individual Ge particles during lithiation. Our results show that there are two types of reaction fronts during lithiation, representing the differences of reactions on the surface and in bulk. The cross-sectional SEM images and transmission electron microscopy characterizations show that the interface between amorphous Li x Ge and Ge has a wedge shape because of the higher Li transport rate on the surface of the particle. The blade-type reaction front is formed at the interface of the amorphous Li x Ge and crystalline Ge and is attributed to the large strain at the interface.
ISSN:1944-8244
1944-8252
DOI:10.1021/acsami.0c13966