Hexagonal tungsten trioxide obtained from peroxo-polytungstate and reversible lithium electro-intercalation into its framework
- Univ. of Tokyo, Minatoku (Japan)
- Hitachi Ltd., Kokubunnji, Tokyo (Japan)
A hexagonal form of WO{sub 3} (a = 7.3244(6), c = 7.6628(5) {angstrom}, z = 6) was synthesized by the low temperature sintering of an ammonium peroxo-polytungstate precursor. This compound, the N/W ratio of which is 0.015 at most, is not identical to reported hexagonal WO{sub 3} from WO{sub 3}{center dot}1/3 H{sub 2}O because its c-axis is significantly shorter than that of the latter (7.798 {angstrom}). Powder XRD profile refinements were performed in the space group P6{sub 3}/mcm. The authors found two kinds of structural models that showed reasonably good profile agreement (R {approx} 0.07). Both models are built up of remarkably distorted WO{sub 6} octahedra, in which part of the O-O distances are very short (2.32 {approximately} 2.42 {angstrom}). Electrochemical intercalation of lithium into the present WO{sub 3} framework work was investigated using a Li{vert bar}LiPF{sub 6}{vert bar}WO{sub 3} cell. It was found that Li was intercalated reversibly up to the composition Li{sub 1.0}WO{sub 3}.
- OSTI ID:
- 7200924
- Journal Information:
- Journal of Solid State Chemistry; (United States), Journal Name: Journal of Solid State Chemistry; (United States) Vol. 96:1; ISSN 0022-4596; ISSN JSSCB
- Country of Publication:
- United States
- Language:
- English
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250903 -- Energy Storage-- Batteries-- Materials
Components
& Auxiliaries
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ALKALI METAL COMPOUNDS
CATIONS
CHALCOGENIDES
CHARGED PARTICLES
CHEMICAL PREPARATION
CHEMISTRY
COHERENT SCATTERING
CRYSTAL LATTICES
CRYSTAL STRUCTURE
DATA
DIFFRACTION
ELECTROCHEMISTRY
EXPERIMENTAL DATA
HEXAGONAL LATTICES
INFORMATION
IONS
LATTICE PARAMETERS
LITHIUM COMPOUNDS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
POWDERS
REFRACTORY METAL COMPOUNDS
SCATTERING
SYNTHESIS
TRANSITION ELEMENT COMPOUNDS
TUNGSTEN COMPOUNDS
TUNGSTEN OXIDES
X-RAY DIFFRACTION