Preparation and structure of amorphous solid electrolytes based on lithiumsulfide

Citation
M. Tatsumisago et al., Preparation and structure of amorphous solid electrolytes based on lithiumsulfide, J NON-CRYST, 274(1-3), 2000, pp. 30-38
Citations number
17
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
JOURNAL OF NON-CRYSTALLINE SOLIDS
ISSN journal
0022-3093 → ACNP
Volume
274
Issue
1-3
Year of publication
2000
Pages
30 - 38
Database
ISI
SICI code
0022-3093(200009)274:1-3<30:PASOAS>2.0.ZU;2-O
Abstract
Structure of amorphous solid electrolytes in the system Li2S-SiS2-Li4SiO4, prepared by twin-roller quenching and mechanical milling, was investigated using nuclear magnetic resonance and X-ray photoelectron spectroscopies (XP S). These spectra revealed that the structure unit comprising two silicon a toms coordinated with three non-bridging sulfur atoms and one bridging oxyg en atom was mainly present in the quenched 95(0.6Li(2)S.0.4SiS(2)).5Li(4)Si O(4) glass. The glass with 5 mol% Li4SiO4 had the largest conductivity at r oom temperature. Amorphous solid electrolytes in the system Li2S-SiS2-Li4Si O4 were also successfully prepared from a mixture of Li2S, SiS2 and Li4SiO4 crystals using a mechanical milling technique at room temperature. The con ductivities of the oxysulfide powders, mechanically milled for 20 h, were g reater than or equal to 10(-4) S cm(-1) at room temperature, which were com parable to the conductivities of the corresponding glasses prepared by quen ching. As the period of mechanical milling treatment was increased from 0 t o 20 h, the structure of the milled powders became similar to that of the g lasses prepared by quenching. Such a structure change brought about an incr ease of conductivity in the resultant powders from 10(-9) to 10(-4) S cm(-1 ). In the case of mechanochemical preparation, the reactivity of the starti ng materials affected the structure and formation process of the oxysulfide solid electrolytes. (C) 2000 Elsevier Science B.V. All rights reserved.