Characterization of the structural response of a lithiated SiO2 / Si interface: A reactive molecular dynamics study

O. Verners, A. Simone

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

We report the results of a computational study regarding the mechanical properties of a lithiated Si/SiO2 interface using reactive molecular dynamics. The study is motivated by an intended application of SiO2-coated Si
nanotubes as fibers in structural batteries with a fiber-reinforced composite architecture while serving as anodes. According to the results, main failure properties due to partly irreversible bond breakage during mechanical deformation are identified, indicating agreement with bond energy/bond order based estimates. Microscopic failure properties are also identified and interpreted in view of the observed processes of bonding degradation. In particular, the effect of Li distribution on the shear deformation response is evaluated as significant.
Original languageEnglish
Article number103030
Number of pages9
JournalMechanics of Materials
Volume136
DOIs
Publication statusPublished - 2019

Keywords

  • Composite cathode
  • Molecular dynamics
  • Silicon
  • Silicon oxide
  • Structural battery

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