Conductivity studies and ion transport mechanism in LiI–Li3PO4 solid electrolyte

Mixtures of LiI–Li3PO4 were sintered at low temperature. It was observed that the conductivity improved up to 10−3 S cm−1 with the addition of LiI. Infrared technique (Fourier transform infrared spectroscopy [FTIR]) was employed to detect the presence of polyhedral structures. From the FTIR spectra of the binary samples with various weight percents of LiI, the PO43− bands and the PO bending experienced small shifting which indicates that interaction has occurred. Alternating current conductivity versus frequency shows a linear variation suggesting that the behavior follows Jonsher power law. The conduction mechanism of LiI–Li3PO4 solid electrolyte follows the quantum mechanical tunneling model.