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SEM images of pristine N-C@Bi anode (a) and cycled N-C@Bi anode in K1 electrolyte (b) and K2 electrolyte (c). Bi 4f (d), F 2p (e), and P 2p (f) XPS spectrum of cycled N-C@Bi anode in K1 electrolyte. Bi 4f (g), S 2p (h), and F 1s (i) XPS spectrum of cycled N-C@Bi anode in K2 electrolyte.
