Aqueous Ni-Fe battery with high safety and low cost is a promising candidate for large-scale electrical energy storage;their performance, however, has been limited by the poor performance of the Fe electrodes. We reported herein a facile synthesis of Fe particles coated with graphitic shell for high-performance Fe anodes. The anodes exhibit a high capacity of 224 mAh g−1at a high current density of 32 A g−1, and a high capacity retention of 90% after 1000 cycles. When coupled with a cathode made from the composites of Ni(OH)2and nitrogen-doped graphene, the batt...
