Electrochemical Impedance of a Battery Electrode with Anisotropic Active Particles
Name
Bazant_EMB to June 2016 Electrochemical impedance.pdf
Size
1.35 MB
Format
Adobe PDF
Checksum (MD5)
dac5907111a35114185cd0a077070998
Author(s)
Song, Juhyun
Bazant, Martin Z
Date Issued
March 2014
Journal
Electrochimica Acta
Publisher
Elsevier
Citation
Song, Juhyun and Bazant, Martin Z. "Electrochemical Impedance of a Battery Electrode with Anisotropic Active Particles." Electrochimica Acta 131 (June 2014): 214-227 © 2014 Elsevier Ltd
Version
Original manuscript
Abstract
Electrochemical impedance spectra for battery electrodes are usually interpreted using models that assume isotropic active particles, having uniform current density and symmetric diffusivities. While this can be reasonable for amorphous or polycrystalline materials with randomly oriented grains, modern electrode materials increasingly consist of highly anisotropic, single-crystalline, nanoparticles, with different impedance characteristics. In this paper, analytical expressions are derived for the impedance of anisotropic particles with tensorial diffusivities and orientation-dependent surface reaction rates and capacitances. The resulting impedance spectrum contains clear signatures of the anisotropic material properties and aspect ratio, as well as statistical variations in any of these parameters.
MIT Department
Massachusetts Institute of Technology. Department of Chemical Engineering
Massachusetts Institute of Technology. Department of Mathematics
Terms of Use
Creative Commons Attribution-NonCommercial-NoDerivs License
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DOI of Published Version
https://doi.org/10.1016/j.electacta.2014.03.013
