| DOI | Trouver le DOI : https://doi.org/10.1149/1945-7111/abcf17 |
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| Auteur | Rechercher : Franko, Christopher J.1Identifiant ORCID : https://orcid.org/0000-0003-2577-1605; Rechercher : Yim, Chae-Ho1Identifiant ORCID : https://orcid.org/0000-0001-7321-1288; Rechercher : Årén, Fabian; Rechercher : Åvall, Gustav; Rechercher : Whitfield, Pamela S.1; Rechercher : Johansson, Patrik; Rechercher : Abu-Lebdeh, Yaser A.1; Rechercher : Goward, Gillian R.Identifiant ORCID : https://orcid.org/0000-0002-7489-3329 |
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| Affiliation | - Conseil national de recherches du Canada. Énergie, les mines et l'environnement
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| Format | Texte, Article |
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| Résumé | The physiochemical properties of lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) in adiponitrile (ADN) electrolytes were explored as a function of concentration. The phase diagram and ionic conductivity plots show a distinct relationship between the eutectic composition of the electrolyte and the concentration of maximum ionic conductivity in the 25 °C isotherm. We propose a structure-based explanation for the variation of electrolyte ionic conductivity with LiTFSI concentration, where the eutectic concentration is a transitionary region at which the structure changes from solvated contact ion pairs to extended units of [Liz(ADN)xTFSIy]ᶻ⁻ʸ aggregates. It is found through diffusion coefficient measurements using pulsed-field gradient (PFG) NMR that both ${D}_{Li}/{D}_{TFSI}$ and ${D}_{Li}/{D}_{ADN}$ increase with concentration until 2.9 M, where after Li+ becomes the fastest diffusing species, suggesting that ion hopping becomes the dominant transport mechanism for Li⁺. Variable diffusion-time (Δ) PFG NMR is used to track this evolution of the ion transport mechanism. A differentiation in Li⁺ transport between the micro and bulk levels that increases with concentration was observed. It is proposed that ion hopping within [Liz(ADN)xTFSIy]ᶻ⁻ʸ aggregates dominates the micro-scale, while the bulk-scale is governed by vehicular transport. Lastly, we demonstrate that LiTFSI in ADN is a suitable electrolyte system for use in Li-O₂ cells. |
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| Date de publication | 2020-12-15 |
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| Maison d’édition | IOP |
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| Dans | |
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| Langue | anglais |
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| Publications évaluées par des pairs | Oui |
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| Exporter la notice | Exporter en format RIS |
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| Signaler une correction | Signaler une correction (s'ouvre dans un nouvel onglet) |
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| Identificateur de l’enregistrement | e0c4882d-ffc9-482f-9b43-ce0b950a41c9 |
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| Enregistrement créé | 2022-01-10 |
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| Enregistrement modifié | 2022-01-10 |
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