Li_2FeSiO_4/C with good performance as cathode material for Li-ion battery

摘要

Li_2FeSiO_4/C has been prepared by the ultrasonic-assisted sol-gel method with about 50 nm Fe_2O_3 particle as Fe source. The structures, morphologies, and carbon content of the product are characterized. Li_2FeSiO_4/C owns pure phase and the particle size of Li_2FeSiO_4 is close to Fe_2O_3 nanoparticle. As the cathode material of Li-ion battery, the product shows stable cycle performance at the wide range of rate and good rate performance. The discharge capacities of the 100th cycle are 140 mAh g~(-1) 125 mAh g~(-1) 120 mAh g~(-1) 110 mAh g~(-1), and 90 mAh g~(-1) at 0.1 C, 0.5C, 1C, 2C, and 5C rate, respectively.