Preparation and electrochemical performance of
hollow-spherical polypyrrole/V2O5 composite
hollow-spherical polypyrrole/V2O5 composite
(1. College of Materials Science and Engineering, Sichuan University, Chengdu 610065, China;
2. Institute for Superconducting and Electronic Materials, University of Wollongong, NSW 2522, Australia)
2. Institute for Superconducting and Electronic Materials, University of Wollongong, NSW 2522, Australia)
Abstract: 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.
Key words: V2O5; hollow microspheres; cathode; lithium-ion batteries