Open AccessBlade-Type Reaction Front in Micrometer-Sized Germanium Particles during Lithiation
Author(s) -
Xinwei Zhou,
Tianyi Li,
Yi Cui,
Melissa Meyerson,
Jason A. Weeks,
C. Buddie Mullins,
Yang Jin,
Hosop Shin,
Yuzi Liu,
Likun Zhu
Publication year - 2020
Publication title -
acs applied materials and interfaces
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.535
H-Index - 228
eISSN - 1944-8252
pISSN - 1944-8244
DOI - 10.1021/acsami.0c13966
Subject(s) - materials science , germanium , transmission electron microscopy , amorphous solid , scanning electron microscope , micrometer , particle (ecology) , scanning transmission electron microscopy , nanotechnology , composite material , crystallography , optics , optoelectronics , silicon , physics , chemistry , oceanography , geology
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.
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