关键词: Li3V2(PO4)3, 正极材料, 碳源

Abstract: The monoclinic Li3V2(PO4)3 cathode materials were prepared by carbothermal reduction method,with methyl cellulose,chitosan(crab shells) or glucose anhydrous as carbon sources,respectively.The crystal structures,morphologies and the electrochemical performances were characterized by XRD,SEM and electrochemical measurement.The XRD patterns show that the samples obtained at 800 ℃ for 6 h have a pure monoclinic structure,which indicates that the carbon exists in amorphous phase.Electrochemical measurements show that the difference of carbon sources has a significant influence on the electrochemical properties of the materials.The Li3V2(PO4)3 /C with methyl cellulose as the reduction agent has the best electrochemical performance.In the voltage range of 3.0 ～ 4.5 V and at 0.2 C(1 C = 140 mAh·g-1),the initial discharge specific capacity reached 130.6 mAh·g-1,and maintained 108 mAh·g-1 after 30 cycles,even after 50 cycles at 1 C,the specific capacity were still more than 90 mAh·g-1.

Key words: Li3V2(PO4)3, cathode materials, carbon sources