Electrochemical Li insertion studies on WNb{sub 12}O{sub 33}-A shear ReO{sub 3} type structure

Journal Article · Sat May 15 00:00:00 EDT 2010 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2010.03.003· OSTI ID:21372583

Saritha, D ^[1]; Pralong, V ^[2]; Raveau, B ^[2]

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1. Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036 (India)
2. Laboratoire de Cristallographie et Sciences des Materiaux, ENSICAEN, Universite de Caen, CNRS, 6 Bd Marechal Juin, F-14050 Caen 4 (France)

Electrochemical lithium insertion studies on WNb{sub 12}O{sub 33} synthesized by solid state reaction (SSR) are carried out in the voltage range 1.0-3.2 V. During first discharge 15.6 Li are inserted with a specific capacity of 221 mAh/g. WNb{sub 12}O{sub 33} is also synthesized by sol-gel (SG) technique with a view to enhance the rate capability and cycling properties. The SSR and SG samples are characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM) and galvanostatic cycling. Electrochemical cycling performance of SG samples is superior to that of the SSR sample at high 'C' rates. The sample synthesized by SG method exhibits high specific capacity of 142 mAh/g after 20 cycles at 20C rate. - Graphical abstract: The projected structure can be described as 3x4xinfinity ReO{sub 3} type blocks of NbO{sub 6} octahedra sharing corners, joined with identical blocks via tetrahedrally coordinated tungsten atoms.

• OSTI ID: 21372583
• Journal Information: Journal of Solid State Chemistry, Vol. 183, Issue 5; Other Information: DOI: 10.1016/j.jssc.2010.03.003; PII: S0022-4596(10)00081-2; Copyright (c) 2010 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ELECTROCHEMISTRY
LITHIUM
NIOBIUM COMPOUNDS
OXIDES
PERFORMANCE
SCANNING ELECTRON MICROSCOPY
SHEAR
SOL-GEL PROCESS
TUNGSTEN COMPOUNDS
X-RAY DIFFRACTION
ALKALI METALS
CHALCOGENIDES
CHEMISTRY
COHERENT SCATTERING
DIFFRACTION
ELECTRON MICROSCOPY
ELEMENTS
METALS
MICROSCOPY
OXYGEN COMPOUNDS
REFRACTORY METAL COMPOUNDS
SCATTERING
TRANSITION ELEMENT COMPOUNDS