Hydrothermal synthesis of Fe-substituted manganese dioxide and its electrochemical characterization for lithium rechargeable batteries

• Fe-substituted MnO2 was synthesized by a hydrothermal route.
• The specific surface area of samples has increased with the increasing content of Fe.
• Fe-substitution had improved the irreversible capacity of MnO2 electrode.

Fe-substituted manganese dioxide (Mn1-xFexO2, x = 0, 0.1, 0.3 and 0.4) nanoparticles were hydrothermally prepared. X-ray diffraction (XRD) analysis showed the γ-phase of MnO2 in all of samples. The presence of Fe was detected by elemental analysis with a X-ray fluorescence (XRF) spectrometer. Field-emission scanning electron microscopy (FE-SEM) images showed the size and morphology of Mn1-xFexO2 became small. The higher specific surface area of samples with increasing content of Fe was confirmed with Brunaure-Emmett-Teller (BET) method. In electrochemical tests, the Mn1-xFexO2-δ (x = 0,0.1,0.3 and 0.4) electrode showed the smaller discharge capacity with increasing content of Fe (180 and 70 in x = 0 and 0.4, respectively) in the 1st discharge. In addition, the Fe-substitution led to slightly improve the irreversible capacity, but the poor cycleability.

Figure optionsDownload as PowerPoint slide