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 language | English (US) |
---|---|
Article number | 163903 |
Journal | Applied Physics Letters |
Volume | 109 |
Issue number | 16 |
DOIs | |
State | Published - Oct 17 2016 |
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)