MnFe2O4Colloidal Nanocrystal Assemblies as Anode Materials for Lithium-Ion Batteries

Abstract

Submicrometer colloidal nanocrystal assemblies (CNAs) of MnFeO have been synthesized solvothermally and have been sued as the electrode materials for Lithium ion batteries. Large MnFeO CNAs, which were prepared with the assistance of CHCOONH, possessed the size of about 950 nm showed a larger pore size but a smaller specific surface area, compared with that of 160 nm MnFeO CNAs with the help of CHCOONa•3HO. The capacitance of MnFe-NH can reach 1200 mAh g at the first circle at the current density of 0.1 A g. However, the capacitances were decreased drastically under the further measurements. MnFe-Na showed about 50 mAh g lower capacity and worse cycle stability than MnFe-NH. Cyclic voltammetry and electrochemical impedance spectroscopy profile indicated the higher electronic conductivity of MnFe-NH, thanks to the larger size of primary crystalline particle and interspace between them.