Synthesis and Properties of Li2MnSiO4/C Cathode Materials for Li-ion Batteries

Carbon was coated on the surface of Li2MnSiO4 to improve the electrochemical performance as cathode materials, which were synthesized by the solution method followed by heat treatment at 700 degrees C and the solid-state method followed by heat treatment at 950 degrees C. It is shown that the cycling performance is greatly enhanced by carbon coating, compared with the pristine Li2MnSiO4 cathode obtained by the solution method. The initial discharge capacity of Li2MnSiO4/C nanocomposite is 280.9 mAh/g at 0.05 C with the carbon content of 33.3 wt%. The reasons for the improved electrochemical performance are smaller grain size and higher electronic conductivity due to the carbon coating. The Li2MnSiO4/C cathode material obtained by the solid-state method exhibits poor cycling performance, the initial discharge capacity is less than 25 mAh/g.