Electrochemical Impedance of a Battery Electrode with Anisotropic Active Particles
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, mod...
| Main Authors: | , |
|---|---|
| Other Authors: | |
| Format: | Article |
| Language: | en_US |
| Published: |
Elsevier
2017
|
| Online Access: | http://hdl.handle.net/1721.1/110573 https://orcid.org/0000-0001-9989-0768 |
| _version_ | 1811093761070989312 |
|---|---|
| author | Song, Juhyun Bazant, Martin Z |
| author2 | Massachusetts Institute of Technology. Department of Chemical Engineering |
| author_facet | Massachusetts Institute of Technology. Department of Chemical Engineering Song, Juhyun Bazant, Martin Z |
| author_sort | Song, Juhyun |
| collection | MIT |
| description | 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. |
| first_indexed | 2024-09-23T15:50:14Z |
| format | Article |
| id | mit-1721.1/110573 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T15:50:14Z |
| publishDate | 2017 |
| publisher | Elsevier |
| record_format | dspace |
| spelling | mit-1721.1/1105732022-10-02T04:29:00Z Electrochemical Impedance of a Battery Electrode with Anisotropic Active Particles Song, Juhyun Bazant, Martin Z Massachusetts Institute of Technology. Department of Chemical Engineering Massachusetts Institute of Technology. Department of Mathematics Song, Juhyun Bazant, Martin Z 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. 2017-07-10T14:24:56Z 2017-07-10T14:24:56Z 2014-03 2014-02 Article http://purl.org/eprint/type/JournalArticle 0013-4686 0019-4686 http://hdl.handle.net/1721.1/110573 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 https://orcid.org/0000-0001-9989-0768 en_US http://dx.doi.org/10.1016/j.electacta.2014.03.013 Electrochimica Acta Creative Commons Attribution-NonCommercial-NoDerivs License http://creativecommons.org/licenses/by-nc-nd/4.0/ application/pdf Elsevier arXiv |
| spellingShingle | Song, Juhyun Bazant, Martin Z Electrochemical Impedance of a Battery Electrode with Anisotropic Active Particles |
| title | Electrochemical Impedance of a Battery Electrode with Anisotropic Active Particles |
| title_full | Electrochemical Impedance of a Battery Electrode with Anisotropic Active Particles |
| title_fullStr | Electrochemical Impedance of a Battery Electrode with Anisotropic Active Particles |
| title_full_unstemmed | Electrochemical Impedance of a Battery Electrode with Anisotropic Active Particles |
| title_short | Electrochemical Impedance of a Battery Electrode with Anisotropic Active Particles |
| title_sort | electrochemical impedance of a battery electrode with anisotropic active particles |
| url | http://hdl.handle.net/1721.1/110573 https://orcid.org/0000-0001-9989-0768 |
| work_keys_str_mv | AT songjuhyun electrochemicalimpedanceofabatteryelectrodewithanisotropicactiveparticles AT bazantmartinz electrochemicalimpedanceofabatteryelectrodewithanisotropicactiveparticles |