VS_2纳米片:一种十分有潜力的锂电池阳极材料（英文）

VS_2 Nanosheets: A Potential Anode Materiral for Li-ion Batteriers

通过一种单步水热法成功制备了花状VS_2纳米片。利用X射线衍射仪(XRD)、拉曼光谱、场发射扫描电镜(SEM)和透射电子显微镜(TEM)等手段对样品进行表征,并研究了其生长机制。实验结果表明:反应温度及时间的不同直接影响着VS_2纳米片的形貌。此外,通过使用VS_2纳米片作为锂离子电池阳极材料,分别研究了充放电电压和循环性能等性质。在200 m A/g电流密度下,电池初始充放电能力分别为195.4和90.6 m Ah/g。随着循环充放电的进行,该电极材料的库伦效率高达98%。可以认为VS_2纳米材料具备高效、高能量密度锂离子电池的阳极材料。

The flower-like VSz nanosheets were synthesized by a one-step solvothermal method. The X-ray diffraction, Raman, SEM, and TEM studies showed the growth mechanism of VS2 flowers in detail. These experimental results indicate that the reaction temperature and time have the direct effect on the formation of VS2 nanosheets. As anode material for Li-ion batteries, the VS2 nanosheets exhibit an initial discharge and charge capacity are 195.4 and 90.6 mAh/g at current density of 200 mA/g. High Coulombic efficiency over 98% and improved rate capacity are achieved for the VS2 nanosheets. All results suggest that the VS2 nanosheets can be utilized as a promising anode material for Li-ion batteries with high power density and fast charge/discharge rates.