Abstract
Iron-based oxides are deemed the most promising anode materials for lithium-ion batteries because of their low cost and high theoretical capacity; however, they still have disadvantages such as large volume variations and poor conductivity. To overcome these disadvantages, we successfully designed and fabricated a unique hollow Fe/Fe2O3 heterostructure nanospheres within N-doped CNFs hybrid structure through electrospinning and in situ oxidation. By adjusting the annealing temperature, the synergistic modulation of phase and morphology from solid Fe nanoparticles to hollow Fe/Fe2O3 and hollow Fe2O3 nanospheres was realized, which improved the electrochemical lithium storage performance. Benefiting from the unique hollow Fe/Fe2O3 heterostructural nanospheres and the hybridisation with the N-doped carbon nanofibers, the Fe/Fe2O3@NCNFs electrode exhibited higher lithium storage capacity, superior rate capability and outstanding cycle stability, achieving a reversible capacity of 938.2 mAh g−1 at 0.2 A g−1. Additionally, the Fe/Fe2O3@NCNFs electrode can still maintain a high capacity of 729.1 mAh g−1 after 900 cycles at a high current density of 0.5 A g−1, with a capacity retention of 97 %. Notably, this novel strategy can generally be applied to the design of different hollow nanostructured iron-based oxides, which is extremely important for developing advanced electrodes for use high-performance energy storage devices.
Published Version
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