Strain Coupling of Conversion-type Fe 3 O 4 Thin Films for Lithium Ion Batteries

Sooyeon Hwang, Qingping Meng, Ping Fan Chen, Kim Kisslinger, Jiajie Cen, Alexander Orlov, Yimei Zhu, Eric A. Stach, Ying-hao Chu, Dong Su*

*Corresponding author for this work

研究成果: Article同行評審

33 引文 斯高帕斯(Scopus)

摘要

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.

原文English
頁(從 - 到)7813-7816
頁數4
期刊Angewandte Chemie - International Edition
56
發行號27
DOIs
出版狀態Published - 1 一月 2017

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