NH4V3O8/carbon nanotubes composite cathode material with high capacity and good rate capability |
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Authors: | Haiyan Wang Kelong Huang Yu RenXiaobing Huang Suqin LiuWenjie Wang |
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Affiliation: | a School of Chemistry and Chemical Engineering, Central South University, Changsha, 410083, PR China b School of Chemistry, University of St Andrews, Fife KY16 9ST, UK c College of Chemistry and Chemical Engineering, Hunan University of Arts and Science, Changde 415000, PR China |
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Abstract: | 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 μm 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 mA g−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. |
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Keywords: | Li-ion battery Ammonium trivanadate Carbon nanotubes Hydrothermal method Cycling stability |
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