Please use this identifier to cite or link to this item: https://doi.org/10.1039/c2jm00062h
Title: Synthesis and electrochemical studies of layer-structured metastable α i-LiVOPO 4
Authors: Shahul Hameed, A.
Nagarathinam, M. 
Reddy, M.V. 
Chowdari, B.V.R. 
Vittal, J.J. 
Issue Date: 21-Apr-2012
Source: Shahul Hameed, A., Nagarathinam, M., Reddy, M.V., Chowdari, B.V.R., Vittal, J.J. (2012-04-21). Synthesis and electrochemical studies of layer-structured metastable α i-LiVOPO 4. Journal of Materials Chemistry 22 (15) : 7206-7213. ScholarBank@NUS Repository. https://doi.org/10.1039/c2jm00062h
Abstract: The layer structured α I-LiVOPO 4 was obtained via a two step chemical synthesis. In the first step, a hydrated phase, LiVOPO 4·2H 2O, was obtained by a simple hydrothermal route at 120 °C. Single crystal X-ray diffraction analysis revealed the structure of LiVOPO 4·2H 2O to be orthorhombic with lattice parameters: a = 8.9454(7) Å, b = 9.0406(7) Å and c = 12.7373(10) Å. Dehydration of the parent compound led to its structural transformation to tetragonal α I-LiVOPO 4, which was only identified previously during the lithium insertion in VOPO 4. We have investigated the solid-state dehydration of LiVOPO 4· 2H 2O and proposed a possible mechanism for the crystal structure transformation. Electrochemical characterization of this rarely studied tetragonal phase revealed its good lithium cycling at high operating voltage. Galvanostatic charge-discharge cycling of α I-LiVOPO 4 was studied in a voltage window of 2.5-4.5 V, which shows a stable reversible capacity of 103(±3) mA h g -1 at a current density of 16 mA g -1 (0.1 C). At higher current rates, although it exhibited good cyclability, the capacity was found to decrease with increasing current rates. The long term cycling stability of the above material was demonstrated at a current rate of 0.5 C up to 200 cycles. © 2012 The Royal Society of Chemistry.
Source Title: Journal of Materials Chemistry
URI: http://scholarbank.nus.edu.sg/handle/10635/95063
ISSN: 09599428
DOI: 10.1039/c2jm00062h
Appears in Collections:Staff Publications

Show full item record
Files in This Item:
There are no files associated with this item.

SCOPUSTM   
Citations

30
checked on Feb 20, 2018

WEB OF SCIENCETM
Citations

23
checked on Nov 17, 2017

Page view(s)

41
checked on Feb 23, 2018

Google ScholarTM

Check

Altmetric


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.