科研之友
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摘要
NH4V3O8/carbon nanotubes (CNTs) composites are synthesized by one-step hydrothermal method. All the samples show the flake-like morphology with the width of up to 5 mu m and thickness of 500 nm and the CNTs are clearly observed on the surface of modified NH4V3O8. It is found that incorporation of 0.5 wt% CNTs into NH4V3O8 could greatly improve its discharge capacity and cycling stability. It delivers a maximum discharge capacity of 358.7 mAh g(-1) at 30 mAg(-1), 55 mAh g(-1) larger than that of the pristine one. At 150 mA g(-1), the composite shows 226.2 mAh g(-1) discharge capacity with excellent capacity retention of 97% after 100 cycles. The much improved electrochemical performance of NH4V3O8 is attributed to incorporation of CNTs, which facilitates the interface charge transfer and Li diffusion.
