Li3V2(PO4)(3) particles embedded in porous N-doped carbon as high-rate and long-life cathode material for Li-ion batteries

摘要

Porous N-doped carbon stabilized Li3V2(PO4)(3) particles are prepared by a modified sol-gel method. Both the in situ doping of nitrogen and the formation of porous structure can be attributed to the addition of dicyandiamide in the sol-gel process. The composite material exhibits a high discharge capacity of 114.7 mA h g(-1) at 1 C in the voltage range of 3-4.3 V after 600 cycles. Even at a high rate of 5 C, the discharge capacity of 90.5 mA h g(-1) is achieved after 600 cycles. The superior electrochemical performance mainly benefits from the porous and nitrogen doped carbon.