Preparation and Electrochemical Properties of Coral-like Li2FeSiO4/C Cathode Material by Two-Step Precipitation Method

Lithium iron silicate (Li2FeSiO4) cathode materials have been synthesized by a soft chemical method combined with spray drying, being both simple and economical. Super P, as a new kind of nanoscale carbon black, was added in the synthesis process. The phase and microstructure of the samples were characterized by x-ray diffraction analysis, scanning electron microscopy, and transmission electron microscopy. The results show that the obtained Li2FeSiO4 possessed coral-like morphology with size range from 250 nm to 450 nm. Super P was decorated on the surface of the Li2FeSiO4 particles. Furthermore, the electrochemical properties of the products were tested, indicating that the as-obtained Li2FeSiO4/C composite presented high specific discharge capacities and stable cycling performance, which can be attributed to the coral-like morphology and Super P coating.