Extended Data Fig. 6: The performance of sulfur iodide cathode at different conditions and their comparison with other SSLSBs.

The dQ/dV curves during delithiation of S_9.3I (a) and S (b) cathode based on the charging curves at 100 °C from Figs. 2a and b. (c) The cycling stability of S, S_35.7I, S_15.9I, S_9.3I and S₆I cathode at 1.6 A g⁻¹ and at 100 °C. (d) The corresponding cycling coulombic efficiency in (c). (e) Rate capability of S_9.3I cathode at 100 °C at current densities of 0.32, 0.48, 0.80, 1.28, 1.60, 2.40, 3.20, 4.00, 4.80 and 5.60 A g⁻¹. Rate performance comparison between Li-S_9.3I solid state batteries with other SSLSBs: based on the weight of (f) only S and (g) S composite, red-colored symbols represent Li metal anode based SSLSBs while other cells used non-Li metal anodes. (h) The cycling performance of S_9.3I cathode with a high mass loading of 4.2 mg cm⁻² at 0.32 A g⁻¹ and at 100 °C. (i) The corresponding voltage profiles at different cycles in (h). (j) Cycling stability comparison between Li-S_9.3I solid state batteries with other reported SSLSBs. The cycling performance of the S_9.3I cathode at varied temperatures and current densities: (k) 80 °C, 0.8 A g⁻¹, (l) 60 °C, 0.8 A g⁻¹, (m) 40 °C, 0.32 A g⁻¹. It should be noted that a low current density was applied to the cells tested at all temperatures during the initial formation cycle.