Characterising lithium-ion electrolytes via operando Raman microspectroscopy

Jack Fawdon, Johannes Ihli, Fabio La Mantia and Mauro Pasta ()
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Jack Fawdon: University of Oxford
Johannes Ihli: University of Oxford
Fabio La Mantia: Universtät Bremen, Energiespeicher-und Energiewandlersysteme
Mauro Pasta: University of Oxford

Nature Communications, 2021, vol. 12, issue 1, 1-9

Abstract: Abstract Knowledge of electrolyte transport and thermodynamic properties in Li-ion and beyond Li-ion technologies is vital for their continued development and success. Here, we present a method for fully characterising electrolyte systems. By measuring the electrolyte concentration gradient over time via operando Raman microspectroscopy, in tandem with potentiostatic electrochemical impedance spectroscopy, the Fickian “apparent” diffusion coefficient, transference number, thermodynamic factor, ionic conductivity and resistance of charge-transfer were quantified within a single experimental setup. Using lithium bis(fluorosulfonyl)imide (LiFSI) in tetraglyme (G4) as a model system, our study provides a visualisation of the electrolyte concentration gradient; a method for determining key electrolyte properties, and a necessary technique for correlating bulk intermolecular electrolyte structure with the described transport and thermodynamic properties.

Date: 2021
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DOI: 10.1038/s41467-021-24297-0

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