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

Research output: Contribution to journalArticle

27 Scopus citations

Abstract

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.

Original languageEnglish
Pages (from-to)7813-7816
Number of pages4
JournalAngewandte Chemie - International Edition
Volume56
Issue number27
DOIs
StatePublished - 1 Jan 2017

Keywords

  • conversion electrodes
  • lithiation
  • magnetite
  • strain
  • thin films

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    Hwang, S., Meng, Q., Chen, P. F., Kisslinger, K., Cen, J., Orlov, A., Zhu, Y., Stach, E. A., Chu, Y., & Su, D. (2017). Strain Coupling of Conversion-type Fe 3 O 4 Thin Films for Lithium Ion Batteries. Angewandte Chemie - International Edition, 56(27), 7813-7816. https://doi.org/10.1002/anie.201703168