Facile synthesis of VO_2(B)/carbon nanobelts with high capacity and good cyclability

摘要

Metastable vanadium dioxide/carbon (VO_2(B)/C) nanobelts have been successfully synthesized via a facile surfactant-free hydrothermal method using V_2O_5 and sucrose as reactants. The VO_2(B)/C with carbon content of 0.96 wt.% shows well-distributed nanobelt morphology with an average width of 120-200 nm, thickness of 40-60 nm and length of 1-3 μm. The nanobelts exhibit preferable electrochemical performances with high initial discharge capacity, good cycling stability and excellent high-rate performance. The initial discharge capacity can reach 218.6mAhg~(-1), and maintain 152.6mAhg~(-1) after 100 cycles at 50mAg~(-1). When the current density increases to 1000mAg~(-1), the discharge capacity is still as high as 138.2 mAh g~(-1). VO_2(B)/C nanobelts would be a promising cathode material for lithium ion batteries.