Fig. 6: Electrochemical performance of the Fe/Li_xM (M = F, S, N) electrodes.

a–c Charge–discharge curves of the Fe/LiF (a), Fe/Li₂S (b), and Fe/Li₃N (c) electrodes at different current densities. d–f Long-term cycling performance of the Fe/LiF (d), Fe/Li₂S (e), and Fe/Li₃N (f) electrodes at a current density of 10 A g⁻¹.