Temperature Dependent Dielectric Properties of Spinel MgMn2O4 Nanofibers for LIB Anode

In the present work, an electrospinning technique has been adopted to fabricate one-dimensional, high aspect-ratio MgMn2O4 nanofibers (MMONFs) with morphological voids/gaps. The as-fabricated MMONFs have been characterized via field-emission scanning electron microscopy with energy-dispersive X-ray spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy, and N2 adsorption/desorption isotherm. The electrical conductivity plays an essential role in enhancing the electrochemical performance of MMONFs. Generally, the elevated temperature operation causes structural reorientations resulting in the thermal runaway of lithium-ion batteries (LIBs). To optimize LIB's operating temperatures, it is necessary to investigate how variation in temperature affects the electrical properties of MMONF anode. In this regard, the application of impedance spectroscopy to study the charge transport properties of MMONFs within the temperature range of 298 to 473 K was performed. The frequency and temperature-dependent electrical conductivities have been found to follow Jonscher's power law, and at room temperature, it is found to be 0.65 microS/cm. These outcomes would be helpful to the design and performance improvement of LIBs based on the MMONFs anode.