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Preparation of Nanostrip V 2 O 5 by the Polyol Method and Its Electrochemical Characterization as Cathode Material for Rechargeable Lithium Batteries

2008; American Chemical Society; Volume: 112; Issue: 42 Linguagem: Inglês

10.1021/jp804182z

1932-7455

P. Ragupathy, S. Shivakumara, H. N. Vasan, N. Munichandraiah,

Supercapacitor Materials and Fabrication

The synthesis of pure nanostrip orthorhombic V2O5 was carried out by a simple two-step procedure, with the formation of a vanadyl ethylene glycolate precursor and postcalcination treatment. The precursor and the final product were characterized for its phase and composition by powder X-ray diffraction, infrared spectroscopy, thermal analysis, and X-ray photoelectron spectroscopy. The morphological changes were investigated using field emission scanning electron microscopy and transmission electron microscopy. It was found that the individual strips have around the following dimensions: length, 1.3 μm; width, 332 nm; thickness, 45 nm. The electrochemical lithium intercalation and deintercalation of nanostrip V2O5 was investigated by cyclic voltammetry, galvanostatic charge−discharge cycling, galvanostatic intermittent titration technique, and electrochemical impedance spectroscopy. From charge−discharge cycling, the initial discharge capacity of the nanostrip was found to be about 427 mAh g−1. However, it decreased due to inherent phase changes on repeated cycling.