| DOI | Resolve DOI: https://doi.org/10.1021/acsaem.2c02647 |
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| Author | Search for: Karkar, Zouina1ORCID identifier: https://orcid.org/0000-0001-8712-8231; Search for: Houache, Mohamed S. E.1ORCID identifier: https://orcid.org/0000-0002-3944-9660; Search for: Niketic, Svetlana1; Search for: Yim, Chae-Ho1ORCID identifier: https://orcid.org/0000-0001-7321-1288; Search for: Abu-Lebdeh, Yaser1ORCID identifier: https://orcid.org/0000-0001-8936-4238 |
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| Affiliation | - National Research Council Canada. Clean Energy Innovation
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| Funder | Search for: Natural Resources Canada |
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| Format | Text, Article |
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| Subject | lithium-ion batteries; silicon-graphite anode; borate-based additive; fluoroethylene carbonate; electrolyte additives; solid electrolyte interphase; passivation layer; lithium fluoride |
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| Abstract | 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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| Publication date | 2022-10-25 |
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| Publisher | American Chemical Society |
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| In | |
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| Language | English |
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| Peer reviewed | Yes |
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| Export citation | Export as RIS |
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| Report a correction | Report a correction (opens in a new tab) |
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| Record identifier | 659281aa-f5d3-4ed5-9595-98d2b0e27ab8 |
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| Record created | 2024-08-23 |
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| Record modified | 2024-08-23 |
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