花状NH4V4O10微纳米结构的水热制备及电化学嵌锂性能

Hydrothermal Synthesis and Electrochemical Lithium Storage Performance of Flower-like NH_4V_4O_(10) Micro/Nano Structures

通过水热法制备了花状NH4V4O10微纳米结构.采用XRD,SEM,TEM和XPS等手段对样品的结构、形貌和组成进行了表征.实验结果表明,所制得的NH4V4O10花状结构是由直径约100 nm,长度为几微米的纳米带团簇构成.研究了反应体系中温度和时间等因素对NH4V4O10形貌的影响.将制备的NH4V4O10组装成锂模拟扣式电池,考察了其电化学嵌锂性能.结果显示,花状NH4V4O10具有较高的比容量(307 mA.h/g),有望作为锂离子电池的新型正极材料.

Flower-like NH4V4O10 micro/nano structures were prepared via a template-free hydrothermal route.The structure,morphology and composition of the as-synthesized products were characterized by X-ray powder diffraction（XRD）,scanning electron microscopy（SEM）,transmission electron microscopy（TEM） and X-ray photoelectron spectroscopy（XPS） measurements.The diameter and length of the ＂petal＂ of the as-synthesized flower-like NH4V4O10 are about 100 nm and several microns,respectively.Effects of hydrothermal reaction parameters were investigated,such as the reaction temperature and time on the structure and morphology of the products.The electrochemical lithium storage of the as-synthesized products was also investigated.The experimental results show that the flower-like NH4V4O10 micro/nano structures exhibit high discharge specific capacity of 307 mA·h/g,indicating their promising application as cathode materials for lithium-ion batteries.