Rate-dependent stress evolution in nanostructured Si anodes upon lithiation

Zheng Jia, Wing Kam Liu

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

The development of stress and fracture in Si-based anodes for lithium-ion batteries is strongly affected by lithiation-induced plasticity. Recent experiments indicate that the nature of plasticity of lithiated silicon is rate-dependent. We establish a theoretical model to capture the viscoplastic mechanical behavior of Si anodes during two-phase lithiation. It is demonstrated that the lithiation-induced stress field is determined by the migration speed of the Li- Li3.75Si interface and the characteristic size of the Si anodes. If experimentally measured interface velocity data in Si nanoparticle are available, the mechanistic model can directly predict the rate-sensitive spatiotemporal stress profile, which is hardly measured in experiments.

Original languageEnglish (US)
Article number163903
JournalApplied Physics Letters
Volume109
Issue number16
DOIs
StatePublished - Oct 17 2016

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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