Structural and ionic conductivity studies of MgI2 - Mg3(PO4)2.5H2O solid electrolytes / Mohd Khairul Hazwan Mohd Yusof

In this study, MgI2 and Mg3(PO4)2.5H20 was ball milled and pelletized to make it as magnesium solid electrolyte. This study was conducted to determine the optimum composition of Mg-based solid electrolyte where MgI2 - Mg3(PO4)2.5H2O pellets are used for investigating maximum ionic conductivity and also it structural properties. A maximum conductivity of 7.00 x 10-4 S cm-1 was obtained with composition of weight 30% MgI2 and 70% Mg3(PO4)2.5H2O. The milling time was 1 hour that gave the optimum value of conductivity. FTIR analysis shows there is a strong interaction between these two pure samples thus resulting a higher conductivity to produce a higher performance of solid electrolyte. XRD patterns shows that MgI2 salt is more crystalline compared to pure Mg3(PO4)2 salt. There is a formation of new complex that gave maximum conductivity value to the magnesium solid electrolyte. The appearance of new peak at 56.36○ in the XRD diagram for 30% MgI2 – 70% Mg3(PO4)2 composition indicates complexation has occurred thus giving a high value of conductivity.