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Strain Coupling of Conversion‐type Fe 3 O 4 Thin Films for Lithium Ion Batteries
Author(s) -
Hwang Sooyeon,
Meng Qingping,
Chen PingFan,
Kisslinger Kim,
Cen Jiajie,
Orlov Alexander,
Zhu Yimei,
Stach Eric A.,
Chu YingHao,
Su Dong
Publication year - 2017
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201703168
Subject(s) - materials science , lithium (medication) , thin film , strain (injury) , substrate (aquarium) , transmission electron microscopy , electrode , coupling (piping) , ion , phase (matter) , delamination (geology) , epitaxy , strain engineering , chemical engineering , composite material , layer (electronics) , nanotechnology , optoelectronics , chemistry , silicon , endocrinology , oceanography , engineering , biology , tectonics , paleontology , medicine , organic chemistry , subduction , geology
Lithiation/delithiation induces significant stresses and strains into the electrodes for lithium ion batteries, which can severely degrade their cycling performance. Moreover, this electrochemically induced strain can interact with the local strain existing at solid–solid interfaces. It is not clear how this interaction affects the lithiation mechanism. The effect of this coupling on the lithiation kinetics in epitaxial Fe 3 O 4 thin film on a Nb‐doped SrTiO 3 substrate is investigated. In situ and ex situ transmission electron microscopy (TEM) results show that the lithiation is suppressed by the compressive interfacial strain. At the interface between the film and substrate, the existence of Li x Fe 3 O 4 rock‐salt phase during lithiation consequently restrains the film from delamination. 2D phase‐field simulation verifies the effect of strain. This work provides critical insights of understanding the solid–solid interfaces of conversion‐type electrodes.