Low ionic conductivity and easily attacked by air are among the common issues of lithium salts in lithium based solid electrolytes. Toward this end, our efforts have been focused on the development of a new lithium based electrolyte system which exhibits a good stability against atmosphere and posses high electrical conductivity. Normally, lithium carbonate (Li2CO3) alone shows a low electrical conductivity (2×10-5 Scm-1). However, the corporation of lithium iodide (LiI) has made a significant impact on the electrical conductivity of the system (4.63×10-3 Scm-1). The xLi2CO3-yLiI (x = 95-70, y = 5-30 wt.%) solid electrolyte were prepared by mechanical milling technique. The electrical and structural properties of the electrolyte systems were characterized by Electrical Impedance Spectroscopy (EIS) and Fourier Transform Infrared (FTIR) respectively. The highest electrical conductivity (4.6×10-3 Scm-1) of the electrolyte system was obtained from the sample containing 20 wt.% of lithium iodide (LiI). The carbonate groups play a role to provide sites for the interaction between interconnected pathways and lithium ions for the fast lithium ion migration.
Li2WO4-LiI-Al2O3 solid electrolytes have been found to be a potential electrolyte for battery applications due to its high electrical conductivity at ambient temperature. The binary solid electrolyte with incorporation Al2O3 was prepared in solid state reaction and characterized by Electrical Impedance Spectroscopy (EIS) and 7Li Magic Angle Spinning (MAS) solid state Nuclear Magnetic Resonance (ssNMR) technique. Maximum electrical conductivity of 3.35x10-3 Scm-1 was recorded for the sample containing 20 wt.% of LiI. The conductivity improved up to 3.92x10-3Scm-1 as 5wt.% of Al2O3 was added into the optimum composition of the binary system. Mobility of the charge carrier in the sample was investigated and NMR result showed that the electrolyte with high ionic mobility contribute into high electrical conductivity.
Inorganic electrolyte consisting of Li2CO3 and LiI with the incorporation of MnO2 as fillers was prepared by a mechanical milling technique. The effects of ceramic filler concentration on the electrolyte host system were investigated by deploying electrical impedance spectroscopy, EIS measurement at a temperature range of 298-373K. It was revealed that incorporating 9 wt. % MnO2 filler in Li2CO3/LiI electrolyte significantly enhanced the electrical conductivity from 4x10-3 S/cm up to 8x10-3 S/cm. Nano-particle inorganic oxides have been found to act as ions dissociation enhancer in solid electrolytes. Dielectric analysis was performed to investigate the ions migration process in solid electrolyte. The dielectric study showed that the ionic conductivity of the electrolyte was observed to increase as a function of temperature, suggesting that the system is thermally assisted. The plots of electrical conductivity, as a function of temperature have been varied from 298 – 373K and were found to obey the Arrhenius law.
The binary solid electrolyte Li2WO4-LiI with incorporation of nanosize Al2O3 was prepared in solid state reaction and characterized by Electrical Impedance Spectroscopy (EIS), Field Emission Scanning Electron Microscopy (FESEM) and Fourier Transform Infrared (FTIR) spectroscopy. Maximum electrical conductivity of 3.35x10-3 Scm-1 was recorded for the sample containing 20 wt. % of LiI. Enhancement of electrical conductivity up to 5.8x10-3Scm-1 was achieved when 0.5 wt. % of Al2O3 was added into the optimum composition of the binary Li2WO4-LiI system. Tetrahedral structure of WO4 that appear at wave number of 906 cm-1 and 955 cm-1 in the FTIR spectroscopy confirmed. The existence of conducting pathway for migrations of Li ions in system that contributes to high electrical conductivity.
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