Fig. 4: LiFSI in G4 concentration-dependent transport and thermodynamic properties.
From: Characterising lithium-ion electrolytes via operando Raman microspectroscopy
a κ, fitted with the Casteel–Amis equation, κmax was calculated as 2.67 mS cm−1 and cmax as 0.99 M. b Rct, showing an initial drop with concentration, then a stabilising at 100–125 Ω cm2. c Dapp, observable was a decrease in Dapp with concentration. d \({t}_{+}^{0}\) showing an increase at low concentrations, then generally plateauing, and increasing again at 2 m. e (dc/dz)z=0,L, which was quite constant at low concentrations but increased rapidly after 1 m. This was concluded to be a result of a dramatic decrease in Dapp with concentration. f χM, which had values below 1 from 0 to 0.5 m, indicating association is dominating the thermodynamics and then begins to increase rapidly as solvation effects start to dominate, with ion-solvent effects out-competing ion-ion effects (χM = 1) at ~0.72 M.
