High electrochemical performance of Fe2O3@OMC for lithium-ions batteries.

Fe2O3@OMC(ordered mesoporous carbon) is synthesized using Fe-MOFs. The Fe2O3@OMC pore size is mostly concentrated around 2-4nm. Fe2O3@OMC demonstrates higher capacity, (The capacity remains 1176.6 mAh g-1 after 500 cycles under current density of 0.1 A g-1) longer cycle life. The first cycle capacity of Fe2O3@OMC is ultra-high 2448.6 mAh g-1, and the reversible capacity is 1294.1 mAh g-1. Fe2O3@OMC still maintains the good performance, under current densities of 0.1 A g-1, 0.2 A g-1, 0.5 A g-1, 1 A g-1, 2 A g-1, 5 A g-1 shows 1100.8 mAh g-1, 1017.6 mAh g-1, 849.3 mAh g-1, 690.7 mAh g-1, 506.7 mAh g-1, 272.1 mAh g-1 electric capacity, respectively. It shows that the material has good rate performance. Combining iron oxide and MOFs is helpful to improve the capacity performance.