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

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.

37 pages, 11 figures

References in corpus (6)

• In Situ Measurements of Stress Evolution in Silicon Thin Films During Electrochemical Lithiation and Delithiation
• A Finite Strain Model of Stress, Diffusion, Plastic Flow and Electrochemical Reactions in a Lithium-ion Half-cell
• Real-time Measurement of Stress and Damage Evolution During Initial Lithiation of Crystalline Silicon
• In Situ Measurements of Stress-Potential Coupling in Lithiated Silicon
• In situ Measurement of Biaxial Modulus of Si Anode for Li-ion Batteries
• Quantifying Capacity Loss due to Solid-Electrolyte-Interphase Layer Formation on Silicon Negative Electrodes in Lithium-ion Batteries

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• Film strains enhance the reversible cycling of intercalation electrodes
• Experimental calibration of a Cahn-Hilliard phase-field model for phase transformations in Li-Sn electrodes
• A novel two-mechanism full battery model for solid state Li-ion batteries: review and comparisons
• Modeling coupled electrochemical and mechanical behavior of soft ionic materials and ionotronic devices
• The effect of mechanical stress on lithium distribution and geometry optimisation for multi-material lithium-ion anodes
• Rethinking battery degradation in presence of surface effects: mechanical versus electrochemical peformance mediated by charging condition