Characterising Lithium-Ion Electrolytes Via Operando Raman Microspectroscopy

The successful innovation of high-energy Li-ion battery alternatives requires a comprehensive understanding their respective electrolyte.1 Full characterisation liquid electrolytes conventionally multiple experimental setups, which can be both time and resource intensive.2,3 Here, we present unified method for characterising using operando Raman microspectroscopy in tandem with potentiostatic electrochemical impedance spectroscopy (PEIS). Performing time-series 1D line scans to measure electrolyte concentration gradients, being PEIS, allowed the quantification Fickian "apparent" diffusion coefficient, transference number, thermodynamic factor, ionic conductivity resistance charge transfer lithium bis(fluorosulfonyl)imide (LiFSI) tetraglyme (G4).4 We believe this facile powerful new experiment is implementable academia industry understand how novel electrolyte's properties are influencing gradient non-uniform Li+ deposition (dendrite growth).