The Study Of Vanadium Oxide Cathode Material For Magnesium Ion Battery

Rechargeable magnesium battery is a promising electrochemical powersource．Magnesium has similarity with lithium in many respects，such as ionic radiusand chemical properties．In addition，magnesium is relatively inexpensive（1/24oflithium），environmentally friendly and safe to handle．Magnesium has large enoughtheoretical specific capacity（2205mAh/g），it may provide a considerably higher energydensity than the commonly used lead-acid and nickel-cadmiun systems．Althoughrechargeable magnesium battery can not compete with lithium battery in terms ofenergy density for small-scale uses， it has potential advantages in heavy loadapplications．Rechargeable magnesium battery is a hopeful green storage battery forapplication in an electric vehicle．The research on rechargeable magnesium battery is under elementarydevelopment．In the paper，the development of rechargeable magnesium ion batteries，magnesium ion batteries cathode material were reviewed．using the method of sol-gelpreparation，with different mass fraction of hydrogen peroxide and V2O5power as rawmaterials，and calcine under different atmosphere，obtained with micro-nano structureVOx(V3O7、VO2/V6O13、VO2and V2O5)，the aims of the present study were to focus onthe preparation processes，the structural characterization and eletrochemicacl propertiesof the VOxcopounds as cathode materials for rechargeable battries．The structural characterization of precursor and samples were measured by menansof differential thermoanalysis(DTA) and thermogravimetry(TG)， X-ray diffraction(XRD)，scanning electron microscopy(SEM)，grain size analyses and the analysis ofspecific surface area．The tests revealed that VOxmaterials which were prepared bysol-gel and calcine at500℃showed better crystal type and had a micro-nanostructure，and nanobelt structure of VO2/V6O13were prepared by adding reductant ofanhydrous ethanol．Using304stainless steel net as current collector，and VOxas the rechargeablemagnesium battery cathode materials， saturated calomel electrode as referenceelectrode，Pt piece as counter electrode，1M Mg(ClO4)2/AN as the electrolyte，assembleinto three electrode sytem，galvanostatic charge-discharge and cycle voltammetry wereintroduced to characterize the VOxmaterials electrochemical properties．Experimentsshow that： at current density of0.3mA/m2，initial discharge specific capacity of V3O7、 VO2/V6O13、VO2and V2O5cathode materials were reached59mAh/g、365mAh/g、251mAh/g and254mAh/g，and had a good ability of capacity-keeping rate，VOxmaterialshad a faster intercalation characteristics and good electrochemical performance．thestructure of the nanobelt VO2/V6O13had the best electrochemical performance，the V3O7had the worst electrochemical performance．...