Measurement and modeling of the mechanical and electrochemical response of amorphous Si thin film electrodes during cyclic lithiation

Giovanna Bucci, Siva P.V. Nadimpalli, Vijay A. Sethuraman, Allan F. Bower, Pradeep R. Guduru

Research output: Contribution to journalArticlepeer-review

116 Scopus citations

Abstract

A combination of experimental measurements and numerical simulations are used to characterize the mechanical and electrochemical response of thin film amorphous Si electrodes during cyclic lithiation. Parameters extracted from the experiment include the variation of elastic modulus and the flow stress as functions of Li concentration; the strain rate sensitivity; the diffusion coefficient for Li transport in the electrode; the free energy of mixing as a function of Li concentration in the electrode; the exchange current density for the Lithium insertion reaction; as well as reaction rates and diffusion coefficients characterizing the rate of formation of solid-electrolyte interphase layer at the electrode surface. Model predictions are compared with experimental measurements; and the implications for practical Si based electrodes are discussed.

Original languageEnglish (US)
Pages (from-to)276-294
Number of pages19
JournalJournal of the Mechanics and Physics of Solids
Volume62
Issue number1
DOIs
StatePublished - Jan 2014
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Keywords

  • Diffusion
  • Elastic-viscoplastic material
  • Electrochemical-mechanical process
  • Lithium-ion battery
  • Si anode

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