Figure 3: Cell performance of the S₈@CB@NNH hybrids.

(a) Long-term cyclic testing of S₈@CB@NNH and S₈@CB at a current rate of 0.2 C in a potential window of ∼1.5–3 V. The inset shows their utilization ratio of active S₈. (b) Charge/discharge voltage profiles, (c) programmed cyclic responses and (d) electrochemical impedance spectrum of S₈@CB@NNH cathode.