Structural, Optical, Electric and Dielectric Characterization of LiMnO2 Compound

Lithium-ion batteries, which are the predominant energy source in electric cars, laptops, mobile phones, and digital cameras, are made up of LiMnO2 [1-5]. It was created using an enhanced solid state and one of the suggested solid electrolytes due to its extra ordinary ionic conductivity. The XRD characteristic of LiMnO2 has undergone a Rietveld refinement, which has identified a monoclinic crystal structure with C2/m space groups. Raman and IR spectroscopies show the presence of MnO6 and LiO6 octahedral groups in this material. Mapping of the elemental microstructure using scanning electronmicroscopy (SEM) and energy dispersive spectroscopy revealed the homogeneity and permeability morphology of LiMnO2 particles. Their dielectric characteristics were measured between 0.1 and 106 Hz and between 303 and 423 K, respectively. The band gap energy has been established and appears to be equal to 1.85 eV, which confirms the semiconductor nature of this compound. The analysis of the electrical data of the impedance spectra and the imaginary part of the complex modulus shows the presence of two types of relaxations corresponding to the grain and grain boundary effects in the two compounds. The thermal evolution of relaxation time and DC conductivity follows Arrhenius' law with a change in activation energy around 353 K. In addition, the frequency behavior of the AC conductivity of this sample was analyzed using Joncher's universal law. Therefore, the variation of s1 and s2, due to temperature, showed the presence of a change in the conduction mechanism around 353 K. Conduction in this material is provided by the low-temperature NSPT model and the high-temperature CBH model.