Fig. 6.

Electrochemical performances of Na/2 M NaTFSI in PC: FEC with 10 mM InI₃/S@MPCF cells. a Long-term cycling performances of Na/2 M NaTFSI in PC: FEC (1: 1 by volume) with 10 mM InI₃/S@MPCF cells at 0.5 C and 1 C; b Rate performances of Na/S@MPCF batteries using 1 M NaTFSI in PC and 2 M NaTFSI in PC: FEC with InI₃ electrolytes. The sulfur loading in Fig. 6a, b is ~0.36 mg cm⁻²; c Cycling performances of Na/2 M NaTFSI in PC: FEC with InI₃/S@MPCF cells at 0.1 C with different sulfur mass loadings; d Comparison of practical specific capacities and cycling performances for representative reported room-temperature Na–S batteries and this work^{8,12–15,24–30,32,37,38,57–61}; e Comparison of practical specific capacities and energy densities of Na batteries and Li batteries with representative reported cathode materials^7,62–64. The specific capacities and energy densities are evaluated by the mass of cathodic active materials only