铁氧化物的制备及其储锂性能研究

发布时间：2018-11-04 21:19

【摘要】：本论文使用简便的水热和溶剂热法合成出一系列具有不同形貌和结构的铁氧化物材料,并对这些产物的形成机理进行了详细地讨论。此外,我们将这些铁氧化物用作锂离子电池负极材料,研究其锂电存储性能,为其在锂电领域中的应用奠定一定的实验基础。主要研究内容如下：(1)采用简单的一步水热法,实现了对铁醇盐各种多级结构的可控合成。通过改变反应条件(如：Fe3+与尿素摩尔比,铁离子价态,反应时间以及反应温度)成功合成了球状、竹节状、纱球状、花状、燕窝状、豆瓣状、薄片状、纸团状和层状结构的铁醇盐。此外,还着重研究了花状铁醇盐的储锂性能,并首次在反应前驱体(如：金属醇盐)中寻找锂电负极替代材料。(2)系统地研究了导电剂和活性物质(Fe304)的形貌对锂电存储性能的影响。研究发现,导电剂的形貌是决定锂电存储性能好坏的首要条件,其次才是活性物质的形貌。此外,我们还详细地讨论了电极材料的形貌匹配原则,从而使得它们在锂电池的设计中发挥更大的效用。
[Abstract]:In this paper, a series of iron oxide materials with different morphologies and structures were synthesized by hydrothermal and solvothermal methods, and the formation mechanism of these products was discussed in detail. In addition, we use these iron oxides as anode materials for lithium ion batteries, and study their lithium storage properties, which will lay a certain experimental foundation for their application in the field of lithium ion batteries. The main research contents are as follows: (1) the controllable synthesis of various multistage structures of ferrite has been realized by a simple one step hydrothermal method. By changing the reaction conditions such as the molar ratio of Fe3 to urea, the valence state of iron ion, the reaction time and the reaction temperature, the globular, bamboo-shaped, yarn globular, flower-like, swallow-nest, pea-petal-shaped, flaky, thin, thin shape were successfully synthesized. Paper-like and layered ferric alcohols. In addition, the lithium-storage properties of flower-like ferric alcohols were also studied. It is the first time to search for lithium electrode substitute materials in the reaction precursors (such as metal alcohols). (2) the effects of the morphology of conductive agent and active material (Fe304) on the storage properties of lithium are systematically studied. It is found that the morphology of the conductive agent is the primary condition for determining the storage performance of lithium, followed by the morphology of the active material. In addition, we also discussed the principle of electrode material morphology matching in detail, which makes them more useful in the design of lithium battery.
【学位授予单位】：青岛科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TQ138.11;TM912

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