钒酸锌纳米材料的可控制备

发布时间：2018-05-05 09:19

  本文选题：电化学测试 + 钒酸锌纳米材料　； 参考：《华北理工大学》2015年硕士论文

【摘要】：近年来,钒酸锌微/纳米材料由于具有与传统体相材料显著不同的纳米效应,而在催化氧化、光致发光以及能源存储等领域有光明的应用前景。针对上述优势,发展新颖的制备方法,并研究其相关生长机制,从而控制产物的物相、形貌、维度及尺寸,对实现该类材料的综合利用具有重要意义。通过高温固相法和水热合成法制备出系列金属钒酸锌微/纳米材料,并考察不同形貌钒酸锌微/纳米材料作为电极材料的电化学性能。采用高温固相法合成m-Zn V2O6微/纳米块状颗粒。在调节体系反应时间和反应温度的基础上,制备出具有不同形貌的钒酸锌产物。采用水热合成法,制备出形貌规整的超长m-Zn V2O6一维纳米线,在监控不同反应时间所得最终产物的微观形貌后,提出“溶解重结晶”和“奥斯特瓦尔熟化分裂”m-Zn V2O6一维纳米线联合生长机制。以钒酸锌微/纳米材料作为电池正极材料,对其进行充放电测试,研究钒酸锌微米/纳米材料的电化学性能。结果显示,与微米纳米线和块体颗粒结构相比较,m-Zn V2O6一维纳米线在充放电测试过程中表现出较高的放电容量和较好的循环稳定性,这主要是因为m-Zn V2O6一维纳米线长径比较大,所以当其作为电极材料时表现出良好的接触行为以及具备锂离子扩散路径短等优势。该材料在未来锂电池关键电极材料中具有潜在的应用价值。
[Abstract]:In recent years, zinc vanadate micro / nanocrystalline materials have a bright future in catalytic oxidation, photoluminescence and energy storage due to their distinct nanometer effects compared with traditional bulk materials. In order to control the phase, morphology, dimension and size of the product, it is of great significance to realize the comprehensive utilization of this kind of materials by developing a novel preparation method and studying its related growth mechanism. A series of metal zinc vanadate micro / nano materials were prepared by high temperature solid state method and hydrothermal synthesis. The electrochemical properties of zinc vanadate micro / nano materials with different morphologies as electrode materials were investigated. M-Zn V2O6 microparticles / nanocrystals were synthesized by high temperature solid state method. Zinc vanadate with different morphologies was prepared on the basis of adjusting reaction time and reaction temperature. Ultralong m-Zn V2O6 nanowires with regular morphology were prepared by hydrothermal synthesis method. The micromorphology of the final product was monitored after different reaction times. The combined growth mechanism of "dissolved recrystallization" and "Osterval ripening splitting" m-Zn V2O6-Wiener wire is proposed. The electrochemical properties of zinc vanadate micrometer / nanocrystalline materials were studied by charge-discharge test using zinc vanadate as cathode material. The results show that compared with micron nanowires and bulk particle structures, m-Zn V2O6 nanowires exhibit higher discharge capacity and better cyclic stability during charge-discharge measurement, which is mainly due to the large length and diameter of m-Zn V2O6 one-dimensional nanowires. Therefore, when it is used as electrode material, it exhibits good contact behavior and has the advantages of short diffusion path of lithium ion. This material has potential application value in key electrode materials of lithium battery in the future.
【学位授予单位】：华北理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB383.1;TQ132.41
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本文编号：1847127