多孔VN纳米带锂离子电池负极材料研究

VN Porous Nanobelts for Anode of Lithium Ion Battery

通过水热法及后续的氮化处理制备了尺寸均一的多孔氮化钒纳米带锂离子电池负极材料。利用SEM和XRD对所制备的样品进行了形貌和成分的表征,并研究了其电化学性能。结果表明,VN纳米带在40 m A/g电流密度下,首次放电比容量可高达374 m Ah/g,经过4次循环稳定之后,库伦效率能达到97%以上,并且100次循环后容量还能保持250 m Ah/g。

Porous one-dimensional nanobelts of vanadium nitride（VN） with homogenous size were prepared by a hydrothermal method combined with subsequent nitriding treatment for anode materials of lithium ion battery. The samples were characterized by scanning electron microscopy（SEM）, X-ray diffraction（XRD） as well as X-ray photoelectron spectroscopy（XPS）. Results show that the specific capacitance of the VN nanobelts can reach 374 m Ah/g for the first time of charge/discharge under the current density of 40 m A/g. The coulomb efficiency is above 97% after stabilization of four cycles and the capacitance can keep 250 m Ah/g after 100 cycles.