Structural and transport studies of CdI2-doped silver borotellurite fast ion-conducting system

• Published in: Journal of solid state electrochemistry Vol. 22; no. 12; pp. 3863 - 3871
• Main Authors: Rao, Puli Nageswar, Ramesh Kumar, E., Appa Rao, B.
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01.12.2018; Springer Nature B.V
• Subjects: Analytical Chemistry; Batteries; Cation exchanging; Characterization and Evaluation of Materials; Chemistry; Chemistry and Materials Science; Condensed Matter Physics; Electrical resistivity; Electrochemistry; Energy Storage; Impedance; Ion currents; Original Paper; Physical Chemistry; Silver; Transport; X-ray diffraction; DC conductivity; Mobility; Fast ion-conducting materials; Transport number; AC conductivity; Ionic conductivity
• ISSN: 1432-8488; 1433-0768
• DOI: 10.1007/s10008-018-4094-9

Fast ion-conducting (FIC) system composed of x CdI 2 –(100– x )[44.4Ag 2 SO 4 –55.6(40TeO 2 –60B 2 O 3 )] has been prepared by melt-quenching method. The prepared samples were characterized by X-ray diffraction (XRD), impedance, and transport studies. XRD, DSC studies conclude that the samples with x =  0 to 20 show predominantly glassy nature. Conductivity measurements were performed in the frequency range 20 Hz–3 MHz by varying temperature from 30 to 150 °C. Electrical parameters such as conductivity and activation energies of all the samples were evaluated by complex impedance analysis and Arrhenius plots, respectively. The obtained results of conductivity are discussed using exchange reaction between the cations based on Lewis’ hard and soft acids and bases (HSAB) principle. Ionic conductivity is identified as being mainly due to Ag + ions. The highest conductivity (order of 10 −4  S cm −1 ) and ionic current (2.063 μA) is observed for CBT20 sample at room temperature; hence, it can be used as the best electrolyte material for solid-state battery application.