Figure 7: Cycling performance of N-C-800 at a current density of 5 A g−1.

To activate the electrode, a current density of 0.2 A g−1 was used for the first two cycles, and then the cycling performance of the N-rich carbon materials was evaluated at 5 A g−1 in the range of 0.01–3.0 V versus Li/Li+. Charge and discharge capacity curves are almost overlapping.