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(a) First two discharge-charge curves and (b) cycle performance of FeO-250 ribbons at a current density of 74 mA g−1. (c) Comparisons of the cycle performance of FeO-250, FeO-300 and FeO-350 ribbons during 30 cycles, as well as (d) rate capabilities of FeO-250, FeO-300 and FeO-350 ribbons at the current densities of 74, 372, 1680 and 3720 mA g−1 after 30 cycles.
