The physicochemical properties of a [DEME][TFSI] ionic liquid-based electrolyte

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Fig. 1. The physicochemical properties of [DEME][TFSI]:DOL mixtures without LiTFSI salt at various molar ratios and temperatures between 278.15 K and 313.15 K: a) conductivity, b) dynamic viscosity, c) density.

Fig. 2. The physicochemical properties of [DEME][TFSI]:DOL:LiTFSI mixtures at 298.15 K: a) conductivity, b) dynamic viscosity, c) density.

Fig. 3. The conductance of different electrolyte mixtures determined from resistive intercept measurements with EIS: a) freshly assembled battery cells with no polysufides dissolved, b) after 10th charge.

Fig. 4. Coulombic efficiencies during 100 cycles at C/10 current rate: a-c show a comparison of electrolytes with the same ionic liquid molar content and different concentrations of LiTFSI salt with a) X = 0.101, b) X = 0.199, c) X = 0.401. d-f show a comparison of the performance of electrolytes with the same LiTFSI concentration with d) 0.1 M LiTFSI, e) 0.5 M LiTFSI, f) 1.0 M LiTFSI.

Fig. 5. Overpotentials over 100 cycles at C/10 current rate: a-c show a comparison of electrolytes with the same ionic liquid molar content and different concentrations of LiTFSI salt with a) X = 0.101, b) X = 0.199, c) X = 0.401; d-f show a comparison of the performance of electrolytes with the same LiTFSI concentration with d) 0.1 M LiTFSI, e) 0.5 M LiTFSI, f) 1.0 M LiTFSI.

Fig. 6. Impedance spectra for charged battery cells after 10 cycles of discharge/charge, comparison of different lithium salt concentrations in the same compositions of dioxolane and [DEME][TFSI]: a) X = 0.101, b) X = 0.199, c) X = 0.401 (Insets show the high-frequency regions of the spectra).