Cyanometallic frameworks derived hierarchical porous Fe2O3/NiO microflowers with excellent lithium-storage property.

Hierarchical porous microflowers composed of porous Fe 2 O 3 /NiO nanoplates were synthesized via a facile cyanometallic framework-templated strategy. The synthesized Fe 2 O 3 /NiO microflowers were characterized by X-ray powder diffraction, scanning electron microscopy, transmission electron microscopy and Brunauer Emmet Teller adsorption-desorption analysis. As anode materials for lithium ion batteries, the Fe 2 O 3 /NiO microflowers exhibit excellent electrochemical performance in terms of great lithium storage capacity (1652.6 mAh g −1 at 100 mA g −1 ) and good cycling stability (1210.4 mAh g −1 capacity retention at 50th cycle). This result can be attributed to the hierarchical porous structure of the Fe 2 O 3 /NiO microflowers, which could increase active sites for lithium ions storage, accommodate the volume expansion/contraction during charge-discharge cycles, and the synergistic effect between Fe 2 O 3 and NiO. [ABSTRACT FROM AUTHOR]