Articles written in Bulletin of Materials Science

    • Impedance analysis of zirconium-doped lithium manganese oxide


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      In recent days, portable electronic devices are indispensable to improve the standard of living, which led to the demand for energy storage devices with good performance. Among the storage devices, rechargeable lithium ion batteries play a vital role due to the good electrical conductivity. In this study, impedance and electrical performance were studied for zirconium-doped Li$_4$Mn$_5$O$_{12}$ at different concentrations (0.1, 0.2, 0.3 and 0.4 mol). The structural andmorphological properties of the material were studied by powder X-ray diffractometer spectra and scanning electron microscopy analysis. Morphological properties exhibit the combination of polyhedral and needle-shaped particles, which were in micron size. The Nyquist plot indicates the absence of grain boundary effect and explained the bulk property, i.e., the negative temperature co-efficient of resistance property of the material. Zirconium-doped lithium manganese oxide (0.2 mol) exhibits good electrical property than other concentrations. Maximum conductivity was ($1.4 \times 10^{-5}$ S cm$^{-1}$)observed at 160$^{\circ}$C for the same. These results suggested that 0.2 mol of zirconium will enhance the electrical property of lithium manganese oxide (Li$_4$Mn$_5$O$_{12}$).

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