Inelastic shape changes of silicon particles and stress evolution at binder/particle interface in a composite electrode during lithiation/delithiation cycling

Hailong Wang, Siva P.V. Nadimpalli, Vivek B. Shenoy

Research output: Contribution to journalArticlepeer-review

26 Scopus citations

Abstract

Inelastic shape changes of Si particles and stress evolution at binder/particle interface was modeled using coupled diffusion–stress framework available in finite element software. A simple model that contains two spherical Si particles with and without the polymer binder film was used to represent the composite electrode. The particles were lithiated and delithiated at two different rates: one representing a slow charging case which results in a uniform Li concentration throughout the Si particles and the other representing a fast charging condition which results in non-uniform lithium concentration within the spherical Si particles. The inelastic shape changes and associated contact forces predicted by the model are qualitatively consistent with experimental data. Further, the effect of binder mechanical properties and the binder fraction on the stress evolution in Si particles and at the binder/particle interface was calculated. The proposed model, although simple, can guide a battery design engineer to choose a proper binder, charge/discharge strategy, and binder fraction for a durable electrode design.

Original languageEnglish (US)
Pages (from-to)430-438
Number of pages9
JournalExtreme Mechanics Letters
Volume9
DOIs
StatePublished - Dec 1 2016

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Chemical Engineering (miscellaneous)
  • Engineering (miscellaneous)
  • Mechanics of Materials
  • Mechanical Engineering

Keywords

  • Binder/particle interface stress
  • Composite electrode model
  • Finite element method
  • Li-ion battery
  • Plastic deformation of lithiated Si
  • Stress–diffusion

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