Publication

Abstract : The present study provides the detailed experimental reports on the electrophoretic co-deposition of camphor derived carbon coated onto LiFePO4 nano particles which has been used for fabricating high surface area rechargeable cathodes. X-ray diffraction analysis revealed the single crystals of the orthorhombic olivine structure of LiFePO4 and transmission electron microscopy image indicated homogeneous carbon coating over LiFePO4. The presence of sp2 hybridized carbon on LiFePO4 particles and oxidation states of iron were confirmed using X-ray photoelectron spectroscopy. Electrochemical characterizations were performed using cyclic voltammetry and electrochemical impedance spectroscopy. The specific capacity was found to be 100±5 mA h g-1 for the pristine sample, whereas it is enhanced to 140±3 mA h g-1 for LiFePO4-C composite. The carbon coated LiFePO4 showed 96% retention in capacity as compared to pristine LiFePO4 (53%). The result indicated that the specific capacity and electronic conductivity of LiFePO4 have been improved by proper carbon coating. © 2013 by American Scientific Publishers.