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Journal articles
Impact of dual-layer solid-electrolyte interphase inhomogeneities on early-stage defect formation in Si electrodes
Abstract : While intensive efforts have been devoted to studying the nature of the solid-electrolyte interphase (SEI), little attention has been paid to understanding its role in the mechanical failures of electrodes. Here we unveil the impact of SEI inhomogeneities on early-stage defect formation in Si electrodes. Buried under the SEI, these early-stage defects are inaccessible by most surface-probing techniques. With operando full field diffraction X-ray microscopy, we observe the formation of these defects in real time and connect their origin to a heterogeneous degree of lithiation. This heterogeneous lithiation is further correlated to inhomo-geneities in topography and lithium-ion mobility in both the inner-and outer-SEI, thanks to a combination of operando atomic force microscopy, electrochemical strain microscopy and sputter-etched X-ray photoelectron spectroscopy. Our multi-modal study bridges observations across the multi-level interfaces (Si/Li x Si/inner-SEI/outer-SEI), thus offering novel insights into the impact of SEI homogeneities on the structural stability of Si-based lithium-ion batteries.
Cited literature [47 references]
https://hal-cea.archives-ouvertes.fr/cea-02888302
Contributor : Samuel Tardif Connect in order to contact the contributor
Submitted on : Thursday, July 2, 2020 - 10:21:33 PM
Last modification on : Tuesday, October 19, 2021 - 11:01:54 AM
Long-term archiving on: : Monday, November 2, 2020 - 3:06:22 PM
Contributor : Samuel Tardif Connect in order to contact the contributor
Submitted on : Thursday, July 2, 2020 - 10:21:33 PM
Last modification on : Tuesday, October 19, 2021 - 11:01:54 AM
Long-term archiving on: : Monday, November 2, 2020 - 3:06:22 PM
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