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Optimization of Sodium Bis(oxalato)borate (NaBOB) in Triethyl Phosphate (TEP) by Electrolyte Additives
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Structural Chemistry.
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Structural Chemistry.
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Structural Chemistry.ORCID iD: 0000-0003-0763-5239
LiFeSiZE AB, SE-754 50, Uppsala, 754 50, SWEDEN.
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2022 (English)In: Journal of the Electrochemical Society, ISSN 0013-4651, E-ISSN 1945-7111, Vol. 169, no 12, article id 120523Article in journal (Refereed) Published
Abstract [en]

The electrolyte solution of NaBOB in TEP is a low-cost, fluorine-free and flame-retardant electrolyte with ionic conductivity of 5 mS cm(-1), recently discovered to show promises for sodium-ion batteries. Here, the abilities of this electrolyte to effectively form a solid electrolyte interphase (SEI) was augmented with five common electrolyte additives of fluoroethylene carbonate (FEC), vinylene carbonate (VC), prop-1-ene-1,3-sultone (PES), 1,3,2-dioxathiolane 2,2-dioxide (DTD) and tris(trimethylsilyl)phosphite (TTSPi). Full-cells with electrodes of Prussian white and hard carbon and industrial mass loadings of >10 mg cm(-2) and electrolyte volumes of <5 ml g(-1) were used. X-ray photoelectron spectroscopy (XPS) and pressure analysis were also deployed to investigate parasitic reactions. Cells using electrolyte additives of PES, PES+DTD and PES+TTSPi (3 wt%) showed significantly increased performance in terms of capacity retention and initial Coulombic efficiency as compared to additive-free NaBOB-TEP. The best cell retained 80% discharge capacity (89 mAh g(-1)) after 450 cycles, which is also significantly better than reference cells using 1 M NaPF6 in EC:DEC electrolyte. This study sheds light on opportunities to optimize the NaBOB-TEP electrolyte for full-cell sodium-ion batteries in order to move from low-mass-loading lab-scale electrodes to high mass loading electrodes aiming for commercialization of sodium-ion batteries.

Place, publisher, year, edition, pages
Institute of Physics (IOP), 2022. Vol. 169, no 12, article id 120523
National Category
Materials Chemistry
Identifiers
URN: urn:nbn:se:uu:diva-490785DOI: 10.1149/1945-7111/acaa5eISI: 000903115600001OAI: oai:DiVA.org:uu-490785DiVA, id: diva2:1719108
Funder
Swedish Energy Agency, 50177-1StandUpVinnova, 2019-00064EU, Horizon 2020, 963542Available from: 2022-12-14 Created: 2022-12-14 Last updated: 2024-05-19Bibliographically approved
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2. Additives for Non-Flammable Electrolytes for Sodium-Ion Batteries
Open this publication in new window or tab >>Additives for Non-Flammable Electrolytes for Sodium-Ion Batteries
2024 (English)Licentiate thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Uppsala University, 2024
Keywords
Sodium-ion battery, Prussian white, hard carbon, non-flammable electrolyte, electrolyte additives.
National Category
Materials Chemistry
Identifiers
urn:nbn:se:uu:diva-528307 (URN)
Presentation
2024-06-10, 80101, Ångströmlaboratoriet, Lägerhyddsvägen 1, Uppsala, 09:15 (English)
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Available from: 2024-05-28 Created: 2024-05-19 Last updated: 2024-05-28Bibliographically approved

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Welch, JonasMogensen, Ronnievan Ekeren, WesselNaylor, Andrew J.Younesi, Reza

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