L۱۶ Orthogonal Design Synthesis of NASICON-type Li۱.۴Al۰.۴Ti۱.۶(PO۴)۳ Solid Electrolyte by Pechini Method for Process Optimization

Na super ionic conductive (NASICON) materials are ceramics with three-dimensional scaffolds. In this study, Li۱.۴Al۰.۴Ti۱.۶(PO۴)۳ with NASICON structure was synthesized by Pechini method. As a result, a sample having a total conduction of ۱.۱۸×۱۰-۳ S cm-۱ was attained. In addition, various parameters were studied to obtain high value of conductivity, by optimizing the process. The optimization was made using L۱۶ Taguchi based orthogonal array, followed by ANOM, ANOVA and stepwise regression. As a result, the optimum synthesis parameters can be obtained, while pH of the solution was adjusted to ۷. The ratio between the concentration of citric acid to metal ions and ethylene glycol concentration stuck to ۱ and ۲.۵, respectively. The best heat treatment can be carried out with a combination of pyrolysis at ۶۰۰ ºC and sintering at ۱۰۰۰ ºC.

Keywords:

NASICON , Pechini , Ionic conductivity , ANOM , Stepwise regression , Electrochemical impedance spectroscopy , LATP , Peroxotitanium.