Thermodynamic Origin of Reaction Non-Uniformity in Battery Porous Electrodes and Its Mitigation

Simple item page
dc.citation.articleNumber120543en_US
dc.citation.journalTitleJournal of The Electrochemical Societyen_US
dc.citation.volumeNumber167en_US
dc.contributor.authorWang, Fanen_US
dc.contributor.authorTang, Mingen_US
dc.date.accessioned2020-10-21T18:16:21Zen_US
dc.date.available2020-10-21T18:16:21Zen_US
dc.date.issued2020en_US
dc.description.abstractThe development of non-uniform reaction current distribution within porous electrodes is a ubiquitous phenomenon during battery charging/discharging and frequently controls the rate performance of battery cells. Reaction inhomogeneity in porous electrodes is usually attributed to the kinetic limitation of mass transport within the electrolyte and/or solid electrode phase. In this work, however, we reveal that it is also strongly influenced by the intrinsic thermodynamic behavior of electrode materials, specifically the dependence of the equilibrium potential on the state of charge: the electrode reaction becomes increasingly non-uniform when the slope of the equilibrium potential curve is reduced. We employ numerical simulations and equivalent circuit model to elucidate such a correlation and show that the degree of reaction inhomogeneity and the resultant discharge capacity can be predicted by a dimensionless reaction uniformity number. For electrode materials that have equilibrium potentials insensitive to the state of charge and exhibit significant reaction non-uniformity, we demonstrate several approaches to spatially homogenizing the reaction current inside porous electrodes, including matching the electronic and ionic resistances, introducing graded electronic conductivity and reducing the surface reaction kinetics.en_US
dc.identifier.citationWang, Fan and Tang, Ming. "Thermodynamic Origin of Reaction Non-Uniformity in Battery Porous Electrodes and Its Mitigation." <i>Journal of The Electrochemical Society,</i> 167, (2020) IOP: https://doi.org/10.1149/1945-7111/abb383.en_US
dc.identifier.doihttps://doi.org/10.1149/1945-7111/abb383en_US
dc.identifier.urihttps://hdl.handle.net/1911/109437en_US
dc.language.isoengen_US
dc.publisherIOPen_US
dc.rightsThis is an open access article distributed under the terms of the Creative Commons Attribution 4.0 License (CC BY, http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse of the work in any medium, provided the original work is properly cited.en_US
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/en_US
dc.titleThermodynamic Origin of Reaction Non-Uniformity in Battery Porous Electrodes and Its Mitigationen_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpublisher versionen_US
Files
Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
Wang_2020.pdf
Size:
1.13 MB
Format:
Adobe Portable Document Format
Description:
Download
Collections
Faculty Publications
Materials Science and NanoEngineering Publications