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dc.contributor.authorWang, Fan
Tang, Ming
dc.date.accessioned 2020-10-21T18:16:21Z
dc.date.available 2020-10-21T18:16:21Z
dc.date.issued 2020
dc.identifier.citation Wang, Fan and Tang, Ming. "Thermodynamic Origin of Reaction Non-Uniformity in Battery Porous Electrodes and Its Mitigation." Journal of The Electrochemical Society, 167, (2020) IOP: https://doi.org/10.1149/1945-7111/abb383.
dc.identifier.urihttps://hdl.handle.net/1911/109437
dc.description.abstract The 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.
dc.language.iso eng
dc.publisher IOP
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.
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.title Thermodynamic Origin of Reaction Non-Uniformity in Battery Porous Electrodes and Its Mitigation
dc.type Journal article
dc.citation.journalTitle Journal of The Electrochemical Society
dc.citation.volumeNumber 167
dc.type.dcmi Text
dc.identifier.doihttps://doi.org/10.1149/1945-7111/abb383
dc.type.publication publisher version
dc.citation.articleNumber 120543


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