Synthesis And Electrochemical Characterization Of V₂O₅ Cathode Material For Rechargeable Batteries

In the paper, the development of rechargeable lithium ion batteries,magnesium ion batteries cathode materials were reviewed. The aims of thepresent study were to focus on the preparation processes, the structuralcharacterization and the electrochemical properties of the V₂O₅ compounds ascathode materials for rechargeable batteries.The structural characterization of V₂O₅ compounds were measured bymeans of differential thermoanalysis (DTA) and thermogravimetry (TG),scanning electron microscopy (SEM), and X-ray diffraction (XRD).The testsreveale that materials which were prepared by sol-gel (Inorganic sol gel andmelting-coling) showed that the amorphous structure, and the interlayer spacingenlarge a lot than that of crystalline V₂O₅. The difference of reactive mechanisminduced the difference of their structure. V₂O₅ product prepared by melting-cooling showed more notable undefined structure. After heat-treating under300℃, particle size becomes smaller, and aggregate to globate grain, showesbetter electrochemical performance at low charge-discharge rate. While testing ofEIS at different depth of dischargeand charge-discharge at different charge-discharge rate reveale that , these material indicate lower conductivity at highcharge-discharge rate, resulting in bad electrochemical perforemence.Melting-cooling and inorganic sol-gel were adopted, which facility-simpleand operating-easy, to prepare V₂O₅ xeroxes as positive material of Li-ion battery.The comparision of structual and electrochemical performance between thesecathode materials were investigated for the first time. Their electrochemicalbehaviorswerestudiedbygalvanostaticcharge-discharge,cyclicvoltammetry(CV), and electrochemical impedance spectroscopy (EIS) techniques.The results indicte the sample that prepared by melting-cooling revealed moreexcellent performance at low charge-discharge rate, which achieved a high initialdischarge specific capacity of approximate 320 mAh·g-1. This material has bettercapacity retention, and the capacity of which still keep as high as 93.6% evenafter 20 cycles.A new sol-gel process (melting-cooling) of preparation V₂O₅ was proposed...