Fig. 7. Solvent effect on cathode performance. (a) LSV of NaFSI-MA and NaFSI-DMC in an Na/Al cell; (b) voltage–time profile of an NVP/Na cell using 3 m NaFSI-MA electrolyte; (c–h) comparison of electrochemical performance and internal resistance between 4 m NaFSI-MA and 4 m NaFSI-DMC for the NVP/Na cell, discharged and charged at 1C rate. (c) Charging and discharging profiles of the 2nd cycle; (d) capacity; (e) EIS curve of each cell after the 5th cycle; (f) Rohm and Rint after the 30th cycle; (g) CE (top) and capacity (bottom) with cycling; (h) ICE and average CE (21st–30th); (i and j) CEI component analyzed by XPS.
