Modeling Lithium Transport and Electrodeposition in Ionic-Liquid Based Electrolytes
Purely ionic electrolytes—wherein ionic liquids replace neutral solvents—have been proposed to improve lithium-ion-battery performance, on the basis that the unique microscopic characteristics of polarized ionic-liquid/electrode interfaces may improve the selectivity and kinetics of interfacial lith...
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| Format: | Article |
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Frontiers Media S.A.
2021-05-01
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| Series: | Frontiers in Energy Research |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/fenrg.2021.660081/full |
| _version_ | 1818644081580965888 |
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| author | Guanchen Li Guanchen Li Charles W. Monroe Charles W. Monroe |
| author_facet | Guanchen Li Guanchen Li Charles W. Monroe Charles W. Monroe |
| author_sort | Guanchen Li |
| collection | DOAJ |
| description | Purely ionic electrolytes—wherein ionic liquids replace neutral solvents—have been proposed to improve lithium-ion-battery performance, on the basis that the unique microscopic characteristics of polarized ionic-liquid/electrode interfaces may improve the selectivity and kinetics of interfacial lithium-exchange reactions. Here we model a “three-ion” ionic-liquid electrolyte, composed of a traditional ionic liquid and a lithium salt with a common anion. Newman's concentrated-solution theory is extended to account for space charging and chemomechanical coupling. We simulate electrolytes in equilibrium and under steady currents. We find that the local conductivity and lithium transference number in the diffuse double layers near interfaces differ considerably from their bulk values. The mechanical coupling causes ion size to play a crucial role in the interface's electrical response. Interfacial kinetics and surface charge on the electrodes both affect the apparent transport properties of purely ionic electrolytes near interfaces. Larger ionic-liquid cations and anions may facilitate interfacial lithium-exchange kinetics. |
| first_indexed | 2024-12-17T00:09:11Z |
| format | Article |
| id | doaj.art-9706cbeed87e4433a6615bb6d27f2b09 |
| institution | Directory Open Access Journal |
| issn | 2296-598X |
| language | English |
| last_indexed | 2024-12-17T00:09:11Z |
| publishDate | 2021-05-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Energy Research |
| spelling | doaj.art-9706cbeed87e4433a6615bb6d27f2b092022-12-21T22:10:52ZengFrontiers Media S.A.Frontiers in Energy Research2296-598X2021-05-01910.3389/fenrg.2021.660081660081Modeling Lithium Transport and Electrodeposition in Ionic-Liquid Based ElectrolytesGuanchen Li0Guanchen Li1Charles W. Monroe2Charles W. Monroe3Department of Engineering Science, University of Oxford, Oxford, United KingdomThe Faraday Institution, Didcot, United KingdomDepartment of Engineering Science, University of Oxford, Oxford, United KingdomThe Faraday Institution, Didcot, United KingdomPurely ionic electrolytes—wherein ionic liquids replace neutral solvents—have been proposed to improve lithium-ion-battery performance, on the basis that the unique microscopic characteristics of polarized ionic-liquid/electrode interfaces may improve the selectivity and kinetics of interfacial lithium-exchange reactions. Here we model a “three-ion” ionic-liquid electrolyte, composed of a traditional ionic liquid and a lithium salt with a common anion. Newman's concentrated-solution theory is extended to account for space charging and chemomechanical coupling. We simulate electrolytes in equilibrium and under steady currents. We find that the local conductivity and lithium transference number in the diffuse double layers near interfaces differ considerably from their bulk values. The mechanical coupling causes ion size to play a crucial role in the interface's electrical response. Interfacial kinetics and surface charge on the electrodes both affect the apparent transport properties of purely ionic electrolytes near interfaces. Larger ionic-liquid cations and anions may facilitate interfacial lithium-exchange kinetics.https://www.frontiersin.org/articles/10.3389/fenrg.2021.660081/fulldouble layerinterfacial impedanceionic liquidsconcentrated solutiontransport phenomena |
| spellingShingle | Guanchen Li Guanchen Li Charles W. Monroe Charles W. Monroe Modeling Lithium Transport and Electrodeposition in Ionic-Liquid Based Electrolytes Frontiers in Energy Research double layer interfacial impedance ionic liquids concentrated solution transport phenomena |
| title | Modeling Lithium Transport and Electrodeposition in Ionic-Liquid Based Electrolytes |
| title_full | Modeling Lithium Transport and Electrodeposition in Ionic-Liquid Based Electrolytes |
| title_fullStr | Modeling Lithium Transport and Electrodeposition in Ionic-Liquid Based Electrolytes |
| title_full_unstemmed | Modeling Lithium Transport and Electrodeposition in Ionic-Liquid Based Electrolytes |
| title_short | Modeling Lithium Transport and Electrodeposition in Ionic-Liquid Based Electrolytes |
| title_sort | modeling lithium transport and electrodeposition in ionic liquid based electrolytes |
| topic | double layer interfacial impedance ionic liquids concentrated solution transport phenomena |
| url | https://www.frontiersin.org/articles/10.3389/fenrg.2021.660081/full |
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