Mesoporous Li2 FeSiO4/C as Cathode Material for Lithium Ion Battery

Mesoporous Li2FeSiO4/C nanocomposite cathode material has been prepared by a sol-gel method based on P123. Effect of calcinations temperature and carbon content on the electrochemical performance was investigated. The structure and morphology of the mesoporous materials were examined by X-ray diffraction, scanning electron microscopy, transmission electron microscopy and N2 adsorption/desorption techniques. The results indicate that the uniform nanometer-sized Li2FeSiO4 particles are embedded in irregular mesoporous amorphous carbon. The mesoporous Li2FeSiO4 with 9.22% carbon coating exhibits the best electrochemical performance especial rate performance. It has a high initial discharge capacity of 178.4 mAh g-1 at 1/16 C and reversible discharge capacity of 100.8 mAh g-1 at 5 C after 100 cycles. The enhanced electrochemical performance can be ascribed to its small size, large specific surface area, uniform carbon-decoration and mesoporous structure. © 2013 by ESG.