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Investigation on the Synthesis and Electrochemical Properties of VO2 Nanomaterial

Author: JiangZuoTao
Tutor: ZhuZiQiang;YuKe
School: East China Normal University
Course: Physical Electronics
Keywords: Vanadium dioxide Hydrothermal method Electrochemical Properties Lithium battery Phase change
CLC: TB383.1
Type: Master's thesis
Year: 2011
Downloads: 127
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Abstract


In this article, we controlled synthesis and electrochemical properties of VO2 (B) the morphology of the nanomaterials research and analysis. Variety of VO2 (B) nanostructures prepared by hydrothermal method, using X-ray diffraction, scanning electron microscopy, transmission electron microscopy characterization generated VO2 (B) The morphology and structure of nanomaterials. On this basis, the comparative analysis of the different structures of VO2 (B) nanomaterials electrochemical performance by VO2 (B) nanomaterials disguised made VO2 (R / M), and its phase transition temperature, The electrochemical performance of research and analysis. The main content and innovations are as follows: catalyst by hydrothermal method to prepare VO2 (B) of the different morphology of nanomaterials. Through a series of experiments, we studied the preparation conditions change of VO2 (B) Morphology of nanomaterials, vanadium pentoxide and oxalic acid as raw materials, made from carambola-like VO2 (B) nanomaterials: to metavanadate ammonium and oxalic acid as the raw materials, and by controlling the reaction conditions to adjust the oxalic acid concentration, reaction time and other conditions and made of VO2 (B) nanorods of VO2 (B) Nanoflower, and a sheet VO2 (B) nanomaterials. 2 the obtained of VO2 (B) nanorods VO2 (B) nanoflowers and flaky VO2 (B) nanomaterials three nanomaterials electrochemical performance of the test, the voltage range of 0.4-1.4V, the current density 10mA / g, by the comparative experiments, tests discharge performance, nanoflowers structure of VO2 (B) exhibits the maximum discharge capacity and the capacity retention performance is also preferably; VO2 (B) In order to further study the electrochemical properties, tested above three morphology of VO2 (B) of the cyclic voltammograms, scan rate 100mV / s The results show that Nanoflower and nanorods VO2 (B) electrode ratio tabular structure of VO2 (B) electrodes have a good capacity retention after 30 cycles of charging and discharging, the peak of the redox peaks almost maintained at the initial value; measurement of cyclic voltammetry characteristic of these three samples with different potential scan rate, the scan rates of 5, 10,50,150,200 and 300 mVs-1, to evaluate their diffusion coefficients. The results show that the diffusion coefficient of VO2 (B) Nanoflower DLi nanorod structure of VO2 (B) of 2.9 times, 9 times that of the sheet-like structure of VO2 (B), is the most potential electrode materials of lithium batteries. 3 V02 (B) nano spent heat treatment under an argon atmosphere, and the phase change does not change the morphology of the nanomaterials generate VO2 (R / M) Nanoflower. Test of VO2 (R / M) nanoflowers DSC curves to determine nanoflowers VO2 (R / M) phase transition temperature measured VO2 (R / M) nanoflowers phase transition temperature of 70 ° C, powder shaped VO2 (R / M), the phase transition temperature is slightly higher, which may be caused due to the size effect of the nano-structured. We also tested the VO2 (R / M) nanoflowers discharge characteristics of the nature and cyclic voltammetry, the experimental results show that the VO2 (R / M) of the discharge performance and the cyclic voltammetry performance are not satisfactory, and is not suitable as a lithium battery electrode material.

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