Abstract
Electrochemical synthesis of Mn02 fibrous coating has been investigated in Mn (N03)2 aqueous solution. The coated fibrous coatings obtained were further annealed and characterized by thermo-gravimetric differential thermal analysis (TG-DTA), X-ray diffraction (XRD), scanning electron microscopy (SEM), and cyclic voltammetry (CV). XRD and TG/DTA diagrams indicated that the coating film was Mn(OHh condensed into MnO at 450°C, oxidized into Mn02 at 600°C, and finally transformed into Mn203at 900°C. The Mn02 coated fibrous electrode of 2.5μm thickness revealing crumpled flakes in nanosize was used as the cathode of lithium battery. Its specific capacity was increased from 1.47 μ Ah/cm^2 of the first cycle to 2.06μ Ah/cm^2 of the second cycle, and then kept it to 500th cycle between 4.0 and 2.0V. The nano-crumpled structures and higher effective areas of Mn02 fibrous electrode were considered as the main factors resulting in the improved capacity and stability, during cyclic lithium insertion and extraction.
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