Controlled Crystallization Synthesis of Porous FePO_4-3H_2O Micro-spheres for Fabricating High Performance LiFePO_4/C Cathode Materials

摘要

Amorphous porous FePO_4-3H_2O micro-spheres were synthesized via a controlled crystallization method. These micro-spheres have a particle size distribution from 10 to 28 ìm. There are larger numbers of pores on the surface of FePO_4-3H_2O microspheres, which are important to synthesize high performance LiFePO_4 cathode materials for the application of lithium ion battery. The electrochemical properties of the LiFePOVC electrode, preparing by using the above porous spherical FePO_-3H_2O particles, were measured. The electrochemical results show that the obtained LiFePO_4/C has a high initial discharge specific capacity of 141.4 mAhg~(-1) and good cycling performance at 0.5 C. The microstructural and electrochemical analyses indicate that this porous spherical FePO_4-3H_2O is a fascinating precursor for preparing LiFePCVC cathode materials.