A simple method to fabricate NiFe2O4/NiO@Fe2O3 core-shelled nanocubes based on Prussian blue analogues for lithium ion battery

Core-shelled NiFe2O4/NiO@Fe2O3 nanocubes were synthesized based on Prussian blue analogues. The core-shelled structure was built through ion-exchange process in aqueous solution, and was remained after calcination. Different concentrations of ferrous affect the size and surface states of PBA precursors and its successor. Fabricated core-shelled NiFe2O4 /NiO@Fe2O3 nanocubes produced with the PBA precursor that soaked in the solution of ferrous ion with the highest concentration in this work appears the most stable capacity during cycles, because of its more homogeneous Fe2O3 layer surface and more complete crystal. At the current density of 100 mA/g, it offers an initial capacity of 1587.96 mA h/g, and the second capacity of 967.91 mA h/g, that was remained as 806.1 mA h/g after 50 cyles. At 500 mA/g, it performs a capacity of 472.5 mA h/g after 500 cycles with a strong stability. (C) 2020 Elsevier B.V. All rights reserved.