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Ion Transport and Electrochemical Properties of Fluorine-Free Lithium-Ion Battery Electrolytes Derived from Biomass
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Chemical Engineering.ORCID iD: 0000-0002-7940-7297
Institute of Physics, Kazan Federal University, 420008 Kazan, Russia.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Chemical Engineering. Medical and Biological Physics, Kazan State Medical University, 420012 Kazan, Russia.ORCID iD: 0000-0002-6810-1882
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Chemical Engineering.ORCID iD: 0000-0003-3652-7798
2021 (English)In: ACS Sustainable Chemistry and Engineering, E-ISSN 2168-0485, Vol. 9, no 23, p. 7769-7780Article in journal (Refereed) Published
Abstract [en]

Unlike conventional electrolytes, ionic liquid (IL)-based electrolytes offer higher thermal stability, acceptable ionic conductivity, and a higher electrochemical stability window (ESW), which are indispensable for the proper functioning of Li-ion batteries. In this study, fluorine-free electrolytes are prepared by mixing the lithium furan-2-carboxylate [Li(FuA)] salt with the tetra(n-butyl)phosphonium furan-2-carboxylate [(P4444)(FuA)] IL in different molar ratios. The anion of these electrolytes is produced from biomass and agricultural waste on a large scale and, therefore, this study is a step ahead toward the development of renewable electrolytes for batteries. The electrolytes are found to have Tonset higher than 568 K and acceptable ionic conductivities in a wide temperature range. The pulsed field gradient nuclear magnetic resonance (PFG-NMR) analysis has confirmed that the (FuA) anion diffuses faster than the (P4444)+ cation in the neat (P4444)(FuA) IL; however, the anion diffusion becomes slower than cation diffusion by doping Li salt. The Li+ ion interacts strongly with the carboxylate functionality in the (FuA) anion and diffuses slower than other ions over the whole studied temperature range. The interaction of the Li+ ion with the carboxylate group is also confirmed by 7Li NMR and Fourier transform infrared (FTIR) spectroscopy. The transference number of the Li+ ion is increased with increasing Li salt concentration. Linear sweep voltammetry (LSV) suggests lithium underpotential deposition and bulk reduction at temperatures above 313 K.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2021. Vol. 9, no 23, p. 7769-7780
Keywords [en]
renewable electrolytes, furan-2-carboxylate, ionic conductivity, nuclear magnetic resonance, underpotential deposition
National Category
Physical Chemistry
Research subject
Chemistry of Interfaces
Identifiers
URN: urn:nbn:se:ltu:diva-84900DOI: 10.1021/acssuschemeng.1c00939ISI: 000662271200009Scopus ID: 2-s2.0-85108425589OAI: oai:DiVA.org:ltu-84900DiVA, id: diva2:1560413
Funder
The Kempe Foundations, SMK-1838Swedish Research Council, 2018-04133
Note

Validerad;2021;Nivå 2;2021-07-16 (johcin);

Finansiär: Kazan Federal University (0671-2020-0051)

Available from: 2021-06-04 Created: 2021-06-04 Last updated: 2022-05-11Bibliographically approved

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Khan, Inayat AliFilippov, AndreiShah, Faiz Ullah

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