A SURVEY UPON THE ELECTROCHEMICAL BEHAVIOR OF INPO4-COATED MOO2 ANODE MATERIAL FOR USUAL LITHIUM-ION BATTERIES

InPO4 nanoparticles used in this paper , were synthesized via chemical deposition method and used for the surface modification of MoO2 to improve its structural stability and electrochemical performance. Structure and surface morphology of pristine and InPO4-coated MoO2 anode material were characterized by electron microscopy imaging (SEM and TEM) and X-ray diffraction (XRD). InPO4 nanoparticles were observed, covering the surface of MoO2 . The electrochemical properties of pristine and InPO4 -coated MoO2 were characterized in the voltage range of 0.01–2.5 V versus Li/Li+ . Cyclic voltammetry studies indicate that the improvement in electrochemical performance of the InPO4 -coated anode material was attributed to the stabilization of the lattice structure during the work. Galvanostatic charge/discharge and electrochemical impedance spectroscopy (EIS) studies reveal that the InPO4 nanoparticle coating improves the rate capability and cycle stability and contributes toward decreasing surface layer and charge-transfer resistances. These results suggest that surface modification with InPO4 nanoparticles suppresses the elimination of oxygen vacancies in the lattice structure during cycling, leading to a better rate performance and cycle life.

کلیدواژه ها:

electrochemical ، stabilization ، SEM ، TEM