LAUSR

Fe3O4/NiFe2O4 nanosheets as anode materials for lithium-ion batteries have been successfully prepared by a facile one-step dealloying method of Al–Fe–Ni alloy precursor. Herein, the XRD results and XPS spectra indicated that the product consists of cubic NiFe2O4 and Fe3O4. Scanning electronic microscopy and transmission electron microscopy images showed the homogenous distribution of Fe3O4/NiFe2O4 in the quasi-hexagonal nanosheets rather than irregular clusters. Besides nanostructures, their electrochemical performances were also enhanced due to the doping of nickel when comparing with the Fe3O4 obtained by dealloying Al–Fe precursor. Cycling and rate tests elicited the DAFN has the Fe3O4/NiFe2O4 product exhibit a higher initial capacity of ~ 1437 mAh g−1 at 200 mA g−1 and modified rate performances, especially they hold a doubled reversible capacity over 500 mAh g−1 after 750 times cycling at 200 mA g−1. Cyclic voltammetry, charge–discharge tests and electrochemical impedance spectra measurements further demonstrated the reinforced initial capacity and cycling stability of the DAFN could be associated with the shortened diffusion pathways and synergistic effect of Fe3O4 and NiFe2O4. The facile and low-cost processing method accompanied with the well-performed product exhibit a promising prospect in the application of lithium-ion storage.