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A Halogen‐Free and Flame‐Retardant Sodium Electrolyte Compatible with Hard Carbon Anodes
Uppsala University, Disciplinary Domain of Science and Technology, Faculty of Science and Technology. Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Structural Chemistry.
Uppsala University, Disciplinary Domain of Science and Technology, Faculty of Science and Technology. Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Structural Chemistry.ORCID iD: 0000-0002-5511-3841
Uppsala University, Disciplinary Domain of Science and Technology, Faculty of Science and Technology. Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Structural Chemistry.ORCID iD: 0000-0002-1442-6593
Department of Materials and Environmental Chemistry Arrhenius Laboratory Stockholm University Stockholm SE‐10691 Sweden.
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2021 (English)In: Advanced Materials Interfaces, ISSN 2196-7350, Vol. 8, no 23, article id 2101135Article in journal (Refereed) Published
Abstract [en]

For sodium-ion batteries, two pressing issues concerning electrolytes are flammability and compatibility with hard carbon anode materials. Non-flammable electrolytes that are sufficiently stable against hard carbon have—to the authors’ knowledge—previously only been obtained by either the use of high salt concentrations or additives. Herein, the authors present a simple, fluorine-free, and flame-retardant electrolyte which is compatible with hard carbon: 0.38 m sodium bis(oxalato)borate (NaBOB) in triethyl phosphate (TEP). A variety of techniques are employed to characterize the physical properties of the electrolyte, and to evaluate the electrochemical performance in full-cell sodium-ion batteries. The results reveal that the conductivity is sufficient for battery operation, no significant self-discharge occurs, and a satisfactory passivation is enabled by the electrolyte. In fact, a mean discharge capacity of 107 ± 4 mAh g−1 is achieved at the 1005th cycle, using Prussian white cathodes and hard carbon anodes. Hence, the studied electrolyte is a promising candidate for use in sodium-ion batteries.

Place, publisher, year, edition, pages
Wiley John Wiley & Sons, 2021. Vol. 8, no 23, article id 2101135
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Materials Chemistry
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URN: urn:nbn:se:uu:diva-462863DOI: 10.1002/admi.202101135ISI: 000709853100001OAI: oai:DiVA.org:uu-462863DiVA, id: diva2:1624273
Funder
Swedish Research Council Formas, 2016-01257, 2018–05973ÅForsk (Ångpanneföreningen's Foundation for Research and Development), 20–675VinnovaSwedish National Infrastructure for Computing (SNIC)Available from: 2022-01-03 Created: 2022-01-03 Last updated: 2024-06-25Bibliographically approved
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Colbin, SimonMogensen, RonnieBuckel, AlexanderNaylor, Andrew J.Kullgren, JollaYounesi, Reza

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