Effects of Carbon Source on Performance of Li₃V₂(PO₄)₃/C Cathode Materials Synthesized via Carbon Thermal Reduction for Li-ion Batteries

摘要

Effects of the source of carbon on properties and performance of Li3V2(PO4)3/C composite cathodematerials were studied using five different carbon containing materials (sucrose, graphite, carbonnanotubes, citric acid, and carbon black) in synthesis via the carbothermal reduction method. It wasfound that the electrochemical performance of the cathode material was greatly dependent on particlesize, carbon content, and electron conductivity, which were all functions of the carbon source. Whenthe ratio of carbon to vanadium was tentatively fixed at 1.25, Li3V2(PO4)3/C synthesized with carbonnanotubes showed the best electrochemical performance due to a high carbon content and uniformlydistributed small particle size. In the further optimization of the ratio of carbon to vanadium in sucrose- synthesized cathode materials, sucrose was verified as more suitable carbon source and able to achieveto higher cathode performance.