Hydrothermal synthesis of hexagonal tungsten trioxide from Li2WO4 solutionand electrochemical lithium intercalation into the oxide

Citation
S. Komaba et al., Hydrothermal synthesis of hexagonal tungsten trioxide from Li2WO4 solutionand electrochemical lithium intercalation into the oxide, SOL ST ION, 135(1-4), 2000, pp. 193-197
Citations number
16
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
SOLID STATE IONICS
ISSN journal
01672738 → ACNP
Volume
135
Issue
1-4
Year of publication
2000
Pages
193 - 197
Database
ISI
SICI code
0167-2738(200011)135:1-4<193:HSOHTT>2.0.ZU;2-B
Abstract
Tungsten trioxides with an open structure were synthesized by a hydrotherma l reaction at 120-180 degreesC from an aqueous Li2WO4 solution at pH values from 0.5 to 2.0. The products contained some water molecules and Lithium i ons, e.g. as x(Li2O) . WO3 . y(H2O) (x = 0.05-0.11, y - 0.6-0.8), and they formed at pH 0.5-1.0 and 1.5-2.0 with hexagonal and orthorhombic cells, res pectively. The x value increased with increasing pH of the Li2WO4 solution and synthesis temperature. Electrochemical lithium intercalation into the t ungsten trioxides was investigated in a LiClO4-propylene carbonate electrol yte solution. The x(Li2O) . WO3 . y(H2O) electrode underwent lithium interc alation up to Li/W = similar to1 on discharge until 1.5 V vs. Li/Li+. (C) 2 000 Elsevier Science B.V. All rights reserved.