| DOI | Trouver le DOI : https://doi.org/10.1021/acsaem.2c02647 |
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| Auteur | Rechercher : Karkar, Zouina1Identifiant ORCID : https://orcid.org/0000-0001-8712-8231; Rechercher : Houache, Mohamed S. E.1Identifiant ORCID : https://orcid.org/0000-0002-3944-9660; Rechercher : Niketic, Svetlana1; Rechercher : Yim, Chae-Ho1Identifiant ORCID : https://orcid.org/0000-0001-7321-1288; Rechercher : Abu-Lebdeh, Yaser1Identifiant ORCID : https://orcid.org/0000-0001-8936-4238 |
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| Affiliation | - Conseil national de recherches Canada. Innovations dans les énergies propres
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| Bailleur de fonds | Rechercher : Natural Resources Canada |
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| Format | Texte, Article |
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| Sujet | lithium-ion batteries; silicon-graphite anode; borate-based additive; fluoroethylene carbonate; electrolyte additives; solid electrolyte interphase; passivation layer; lithium fluoride |
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| Résumé | In order to improve the energy density of Li-ion batteries, in this work, we investigate the effect of newly synthesized polymeric borate ester (PBE) additives on the electrochemical performance of the high-capacity silicon-graphite (Si-C) anode in half-cells coupled with the LiNi₁/₃Mn₁/₃Co₁/₃O₂ (NMC532) cathode in full cells with a direct comparison to the conventional fluoroethylene carbonate (FEC) additive. We present a one-step route to prepare polymer additives having borate ester groups by reacting organic diols with boric acid in a simple condensation reaction. One polymer synthesized with diethylene glycol (PBE-DG) is studied extensively, and then its chemical structure is confirmed by ¹H NMR and Fourier transform infrared spectroscopy (FTIR) spectroscopy. When used as an additive in carbonate electrolyte solutions, it shows excellent electrochemical stability and improved battery performance. It is shown that after 50 cycles, the discharge capacity retention of its half-cells is 75% while the FEC-based electrolyte additive is much lower (37%). We have further investigated fresh and cycled electrode surfaces by SEM and XPS techniques and attributed improvements in the cycling performance to changes in the electrode morphology. In addition, the formation of a stable solid electrolyte interfase (SEI) layer that is rich in inorganic species (LiF) and poor in organic compounds leads to enhanced protection of the Si-C electrodes from degradation. This work opens the door to a different class of battery additives with the potential to enhance the energy density of Li-ion batteries. |
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| Date de publication | 2022-10-25 |
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| Maison d’édition | American Chemical Society |
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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 | 659281aa-f5d3-4ed5-9595-98d2b0e27ab8 |
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| Enregistrement créé | 2024-08-23 |
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| Enregistrement modifié | 2024-08-23 |
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