Vanadium pentoxide gel was synthesized by using sol-gel method,and freezed drying to get the vanadium pentoxide xerogel,which were ammonolyzed to vanadium nitride nanoparticals in high purity anhydrous NH3 atmosphere.The samples were characterized by transmission electron microscope(TEM)and X-ray diffraction(XRD),the vanadium nitride nanoparticles have homogeneous spherical structure with an average diameter of 12 nm,and its crystal structure belongs to face-cubic.
In order to improve the lower practical capacity and bad cyclability of crystalline V2O5（c-V2O5）,the vanadium oxide（V2O5） and polypyrrole（PPy） hybrid with hollow-spherical（HS） structure was studied.HS nanocomposite comprised of conductive polypyrrole and vanadium pentoxide（PPy/V2O5） was synthesized by polymerization of pyrrole monomer（Py） in the hollow-microspherical V2O5 host.This novel hybrid was characterized by X-ray diffraction（XRD）,scanning electron microscopy（SEM）,transmission electron microscopy（TEM） and tested as the cathode material for lithium-ion batteries（LIB） by galvanostatic cell cycling and electrochemical impedance spectroscopy（EIS）.The hollow-spherical polypyrrole/vanadium oxide（HS-PPy/V2O5） composites,in which PPy molecules are intercalated between the layers of V2O5,exhibit slight reduced capacity and substantially improve cyclability and electrochemical activity compared with the pure HS-V2O5.
