Electrolytic properties of the MeLn2S4-Ln′2 S3 phases synthesized using the sol-gel and cryochemical technologies

Abstract

The possibility of synthesizing sulfide conducting solid electrolytes based on the ternary sulfides MeLn 2 S 4 doped with the binary sulfides S 3 has been approved and the influence of dopants on the elec trolytic properties of the basic compounds has been investigated for the first time. The influence of the spe cific features of the method used for synthesizing complex sulfide phases from nanometer sized oxide precur sors on the important functional properties of the solid electrolytes has been analyzed. The samples have been examined using the X ray powder diffraction analysis, electron scanning microscopy, and electron micro probe analysis. The region of the existence of the solid solutions has been determined, the total electrical con ductivity has been studied, and the activation energy for electrical conduction for samples with different dopant contents has been calculated. The ionic and electronic transfer numbers have been determined using the modified versions of the emf method and the Hebb-Wagner polarization method. A possible mechanism of defect formation has been proposed.