Superionic Conduction in Rapidly Quenched Li₂S-SiS₂-Li₃PO₄ Glasses

Abstract

Lithium ion conducting glasses were prepared in the system (0.6Li2S•E0.4SiS2)-Li3PO4 by twin-roller rapid quenching. The temperatures of glass transition (Tg) and crystallization (Tc) were determined for the glassy samples with 0-40mol% Li3PO4. The conductivity values at 25•Ž (ƒÐ25) were maximized and the activation energies (Ea) for conduction were minimized at the composition with 5mol% Li3PO4; the maximum ƒÐ25 value was as high as 9•~10-4S•Ecm-1. Since the differ ence between Tg and Tc was also maximized at the same composition, it was concluded that the doping of small amounts of Li3PO4 improved both the glass stabil ity against crystallization and the lithium ion conduc tivities.

Glass Electrolytes with High Ion Conductivity and High Chemical Stability in the System LiI-Li2O-Li2S-P2S5

“…Amounts of H 2 S gas generated from 100 mg of powder samples were measured. A H 2 S gas sensor (GX-2009, Riken Keiki Co., LTD), a fan and a Al 2 O 3 crucible filled with water were placed in a 1750 cm 3 desiccator. The powder samples were placed in the desiccator in air and a desiccator lid was closed.…”

“…27 Li 2 S-SiS 2 based glasses had high conductivities of 10 ¹3 S cm ¹1 at room temperature. 2,3 Li 2 S-P 2 S 5 glasses and glass-ceramics exhibited high conductivities of 10 ¹3 S cm ¹1 at room temperature and wide electrochemical windows of 05 V (vs. Li + /Li). 4,5 Li-Ge-P-S system crystals showed very high conductivities of 10…”

Structure and properties of the 70Li2S · (30 −x)P2S5·xP2O5 oxysulfide glasses and glass–ceramics

“…On the other hand, the addition of a small amount of Li 4 SiO 4 to the Li 2 S-SiS 2 glasses was reported to improve conductivity and electrochemical stability of the glasses [8][9][10]. 29 Si MAS-NMR spectra of the oxysulfide glasses suggested that a SiOS 3 tetrahedral unit, in which oxygen atom is substituted for sulfur atom in a SiS 4 unit, was produced in the Li 2 S-SiS 2 -Li 4 SiO 4 oxysulfide glasses [10].…”

Preparation of lithium ion conducting glasses and glass–ceramics for all-solid-state batteries

“…A number of lithium ion conducting sulfide and oxysulfide glasses have been prepared by using a rapid meltquenching technique [4][5][6][7][8][9]. We have also developed mechanochemical preparation of sulfide-based glasses from the idea that they are especially favorable for solid electrolytes in application to all-solid-state lithium secondary batteries [10].…”