This PDF file includes:

• Table S1. Structural properties of silica matrix in the nano-SCE for increasing molar fraction of ionic liquid to silica (x value) determined from N₂ adsorption/desorption or BET measurements and TEM observations.
• Fig. S1. Normalized conductivity versus equivalent ILE thickness.
• Fig. S2. The effect of ice-like and liquid-like adsorbed water on nano-SCE ion conductivity.
• Fig. S3. Temperature dependence of the conductivity of the nano-SCE.
• Fig. S4. TGA curves for nano-SCE.
• Fig. S5. SEM images of the nano-SCE.
• Fig. S6. N₂ adsorption/desorption isotherm of the silica derived from nano-SCE.
• Fig. S7. Solid-state three-electrode setup for cyclic voltammetry on nano-SCE pellets.
• Fig. S8. IR spectra of nano-SCE (x = 1.5), ILE, and silica in the range of 4000 to 400 cm⁻¹.
• Fig. S9. IR spectra of 225-nm nano-SCE (x = 1.5) and Li/SCE thin-film stack.

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