电沉积直接制备锂离子电池铝及锡基纳米线负极的研究
发布时间：2018-11-10 10:35
【摘要】：金属基负极材料因其高比容量和安全性非常有希望成为下一代锂离子电池负极材料。纳米化和合金化是解决金属基负极材料在使用过程中严重体积膨胀问题的有效途径。本文在不使用模板法的情况下,于离子液体中直接电沉积得到AlFe及SnCo合金纳米线负极材料。该研究为锂离子电池金属基负极材料的制备提供了更加简便、低廉的方法,研究内容具有较好的理论与实际应用价值。论文采用AlCl_3-FeCl_3-TMHC离子液体,研究了Al3+离子及Fe3+离子的电化学还原过程和形核机理。通过恒电位电解,在AlCl_3-FeCl_3-TMHC离子液体中制备了 AlFe合金纳米线。研究了 FeCl_3对形成的纳米线的形貌、成分、结构以及A1纳米线负极材料性能的影响。研究结果得到平均直径约为140nm的AlFe纳米线,作为锂离子电池负极材料在循环50圈之后容量能够保持约570mAh/g。在SnCl_2-CoCl_2-EMIC离子液体中,直接电沉积制备了 SnCo合金纳米线。研究了离子液体组成、电位等参数对电沉积所得产物的形貌、成分及作为锂离子电池负极性能的影响。研究结果表明:通过直接电沉积能够得到平均直径约为50nm的SnCo纳米线,其作为锂离子电池负极材料在循环60圈之后比容量能保持600mAh/g。实验证明了过渡金属Fe、Co掺杂在一定程度上能够起到提高金属Al、Sn作为负极材料循环性能的作用。
[Abstract]:Metal-based anode materials are expected to be the next generation of cathode materials for lithium ion batteries due to their high specific capacity and safety. Nanocrystalline and alloying are effective ways to solve the serious volume expansion problem of metal based anode materials. In this paper, AlFe and SnCo alloy nanowire anode materials were obtained by direct electrodeposition in ionic liquids without template method. This study provides a more simple and inexpensive method for the preparation of metal-based anode materials for lithium ion batteries, and the research content has good theoretical and practical application value. The electrochemical reduction process and nucleation mechanism of Al3 and Fe3 ions were studied by using AlCl_3-FeCl_3-TMHC ionic liquids. AlFe alloy nanowires were prepared in AlCl_3-FeCl_3-TMHC ionic liquids by potentiostatic electrolysis. The effects of FeCl_3 on the morphology, composition, structure and properties of Al nanowires were investigated. The results show that AlFe nanowires with an average diameter of about 140nm can be used as anode materials for lithium-ion batteries to maintain the capacity of about 570 mAh/ g after 50 cycles. SnCo alloy nanowires were prepared by direct electrodeposition in SnCl_2-CoCl_2-EMIC ionic liquids. The effects of ionic liquid composition, potential and other parameters on the morphology, composition and negative electrode performance of the products obtained by electrodeposition were studied. The results show that SnCo nanowires with an average diameter of about 50nm can be obtained by direct electrodeposition, and the specific capacity of SnCo nanowires, which are used as anode materials for lithium ion batteries, can be kept at 600mAh/ g after 60 cycles. The experimental results show that transition metal Fe,Co doping can improve the cycling performance of metal Al,Sn as anode materials to some extent.
【学位授予单位】：华东理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM912
本文编号：2322225
[Abstract]:Metal-based anode materials are expected to be the next generation of cathode materials for lithium ion batteries due to their high specific capacity and safety. Nanocrystalline and alloying are effective ways to solve the serious volume expansion problem of metal based anode materials. In this paper, AlFe and SnCo alloy nanowire anode materials were obtained by direct electrodeposition in ionic liquids without template method. This study provides a more simple and inexpensive method for the preparation of metal-based anode materials for lithium ion batteries, and the research content has good theoretical and practical application value. The electrochemical reduction process and nucleation mechanism of Al3 and Fe3 ions were studied by using AlCl_3-FeCl_3-TMHC ionic liquids. AlFe alloy nanowires were prepared in AlCl_3-FeCl_3-TMHC ionic liquids by potentiostatic electrolysis. The effects of FeCl_3 on the morphology, composition, structure and properties of Al nanowires were investigated. The results show that AlFe nanowires with an average diameter of about 140nm can be used as anode materials for lithium-ion batteries to maintain the capacity of about 570 mAh/ g after 50 cycles. SnCo alloy nanowires were prepared by direct electrodeposition in SnCl_2-CoCl_2-EMIC ionic liquids. The effects of ionic liquid composition, potential and other parameters on the morphology, composition and negative electrode performance of the products obtained by electrodeposition were studied. The results show that SnCo nanowires with an average diameter of about 50nm can be obtained by direct electrodeposition, and the specific capacity of SnCo nanowires, which are used as anode materials for lithium ion batteries, can be kept at 600mAh/ g after 60 cycles. The experimental results show that transition metal Fe,Co doping can improve the cycling performance of metal Al,Sn as anode materials to some extent.
【学位授予单位】：华东理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM912
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