Synthesis of Li2FeSiO4/C Composite as Cathode Materials for Lithium Ion Battery by Microwave Assisted Solid Reaction Method

The homogeneous distribution of FeOOH/SiO2 precursor material was prepared from FeCl2 4H2O and Na2SiO3 9H2O by low-heating solid-state reaction. Then Li2FeSiO4/C composites were prepared by microwave assisted solid reaction method, with prepared precursor FeOOH/SiO2 and Li2CO3 as the starting materials, PVA and super-P carbon as carbon sources. The prepared samples were characterized by X-ray diffractometry, SEM, TEM, and galvanostatic charge-discharge test. Highly pure Li2FeSiO4/C material with uniform and fine particle size was obtained at 650 n 12 min. Under the selective microwave synthesis system, super-P carbon powder and pyrolyzed amorphous carbon not only effectively provided the high temperature to induce the complete reaction but also formed the conductive network to enhance the electronic conductivity. The optimum Li2FeSiO4/C composite displayed discharge capacity of 129.6 mAh/g at 0.05C rate and 107.5 mAh/g at 0.5C rate at 60 After 15 cycles the discharge capacity maintained 104.8 mAh/g at 0.5C, indicating good electrochemical capacity and cycling stability. Consequently, the results show that microwave assisted solid synthesis process is a promising method for preparing Li2FeSiO4/C composite.