Ion-conducting chalcogenide glasses of a AgX (X = S/I)-modified GeSbS system were triumphantly synthesized through the conventional techniques of melt quenching. The evolution of the physical and structural natures of these samples were examined through density and microhardness tests, DSC, and Raman scattering spectroscopy. The electric features of the bulk samples were studied by means of impedance spectroscopy. Room-temperature ionic conductivity dramatically increased by six orders of magnitude from 7.68 × 10-10 to 3.54 × 10-4 S/cm with increasing Ag + content. The blocking effect, a novel phenomenon caused by the presence of a small amount of I ions in the glass system, was also observed, and its corresponding mechanism was proposed. The blocking effect hindered a portion of the mobile carriers in the network. Another phenomenon, i.e., the saturation of Ag ions, resulted in a slow increase in ionic conductivity at high Ag + dopant concentrations. These results provide novel insights into structural evolution and electrochemical properties of metal-doped solid electrolytes.

No abstract

AgI‐based Ge–Sb–S, Ga–Sb–S, and Ge–Ga–Sb–S chalcogenide glasses were designed and prepared by melt‐quenching, thereafter their thermal properties and conductive performance were comparatively investigated on the basis of their composition‐induced network structures. Glass transition in each sample was examined by DSC measurements. Results showed that the samples containing Ge had a higher thermal stability than the Ga–Sb–S–AgI sample, and the Ge–Sb–S–AgI sample obtained had the highest conductivity ion. Raman spectrum analysis was performed, and the results indicated that the [GeS4‐xIx] structural units and [SbS3−xIx] pyramids in the matrix produced effective ion transport channel for dissolved conductive Ag+ ions. In the matrix containing Ga, the [Ga(Ge)S4‐xIx] structure was consumed by part of [S3Ga–GaS3] ethane‐like units, which had no contribution to the ion transition framework. The study provided the directions for composition and structure configuration control in effective conductive chalcogenide glasses.

High ionic conductivity, low grain boundary impedance, and stable electrochemical property have become the focus for all-solid-state lithium-sulfur batteries (ASSLSB). One of the approaches is to promote the rapid diffusion of lithium ions by regulating the chemical bond interactions within the framework. The structure control of P 5+ substitution for Sn 4+ on lithium-ion transport was explored for a series of Li 3 PS 4 -Li 4 SnS 4 glass-ceramic electrolytes. Results showed that the grain boundary impedance of the glass electrolyte was reduced after heat treatments. The formation of LiSnPS microcrystals, a good superionic conductor, was detected by X-ray diffraction tests. Electrochemical experiments obtained the highest conductivity of 29.5 S cm −1 at 100 • C and stable electrochemical window from -0.1 to 5 V at 25 • C. In addition, the cell battery was assembled with prepared electrolyte, which is promoted as a candidate solid electrolyte material with improved performance for ASSLSB.

No abstract