Journal
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
Volume 62, Issue -, Pages 276-294Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jmps.2013.10.005
Keywords
Electrochemical-mechanical process; Diffusion; Elastic-viscoplastic material; Lithium-ion battery; Si anode
Funding
- U.S. Department of Energy through DOE EPSCoR Implementation Grant [DE-SC0007074]
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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. (C) 2013 Elsevier Ltd. All rights reserved.
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