Fig. 4
Discharge capacities and cyclic performances of the samples in a voltage range of 4.8–2.0 V; a discharge capacity of pristine H, composite HA, and composite HN at current densities of 44, 110, 220, 440, and 1320 mA g−1; b discharge capacity of pristine G, composite GA, and composite GN at current densities of 44, 110, 220, 440, and 1320 mA g−1; c cyclic performance of pristine H, composite HA, and composite HN at a current density of 110 mA g−1; d cyclic performance of pristine G, composite GA, and composite GN at a current density of 110 mA g−1