Synthesis and Lithium Ion Storage Properties of Carbon Modified Iron Oxide Metal Frameworks

Carbon-modified iron oxide metal frameworks (MOF), a highly porous nanostructured Li-ion battery material, were synthesized via chemical route.First, Fe₂O₃ micro-cubes were fabricated by calcination of Prussian blue micro-cubes;next, amorphous carbon thin films were deposited on its porous surfaces by hydro-thermal method in glucose solution;and finally, the microstructures and Li-ion storage behavior of the dried C@Fe₂O₃ micro-cubes were characterized with X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy, transmission electron microscopy and cyclic voltammetry.The results show that the modification of carbon coating significantly improves the conductivity and Li-iron storage performance of Fe₂O₃ micro-cubes.To be specific, the discharge capacity of the porous C@Fe₂O₃ micro-cubes was up to 598 mAh/g after 100 cycles.Moreover, the volumetric effect in charge/discharge of the C@Fe₂O₃ micro-cubes was markedly weakened.