掺杂含铁配合物及其衍生物制备与在电池中的应用研究

发布时间：2018-12-13 19:26

【摘要】：锂离子电池由于其比容量高,电压大,寿命长,环保等特点成为当代最具有潜能的能源之一。而随着锂离子电池在全球范围内的应用越来越广泛,人们对其性能的要求也有所提高,开发一种新型锂离子电池负极材料成为人们关注的热点。金属有机配位聚合物作为一种新型材料,本身及其衍生物的电化学性能逐步得到了人们广泛关注,成为锂离子电池负极材料一个不错选择。本文通过水热法成功合成了掺杂的含铁金属有机配位聚合物及其衍生物,并研究它们在锂离子电池中的应用,具体研究内容如下:(1)通过水热合成功合成出一种含铁和锌,具有一维多孔结构的金属有机配位聚合物,并对其结构,物相形貌进行表征。将其和石墨烯复合后表现出良好的电化学性能,在电流密度为50mA/g下,循环100个周期后比容量仍可达到305mAh/g。将其作为前驱体在空气中进行煅烧,形成氧化物首次比容量可达到3082mAh/g。而在氮气中煅烧得到的碳/氧化物,其首次比容量为1364mAh/g,循环100个周期后比容量仍可保持为230mAh/g。(2)通过改变铁和锌比例得到结构不同的金属有机配位聚合物,并表征结构和形貌。将其和石墨烯进行复合做成电极材料,在50m A/g的电流密度下,首次比容量为1621mAh/g,100个周期的循环之后,比容量仍可稳定在200mAh/g。通过配合物作为前驱体高温热解方法得到的氧化物,首次充放比容量较高,碳包覆的金属氧化物循环100周期的比容量为260m Ah/g。(3)通过水热法合成了含铁,锌,锂三元金属有机配位聚合物,其电化学测试表明首次比容量较高,可达3636mAh/g,但循环稳定性能不好,通过与石墨烯复合,得到的复合材料循环100个周期的比容量可达159mAh/g。将前驱体进行煅烧后首次比容量为1191mAh/g,循环100周期后的可逆比容量约80mAh/g。(4)成功合成了含铁和锰的金属有机配位聚合物,并对其结构,形貌进行表征。将其作为电极材料,其首次比容量为1444mAh/g,循环100个周期后可逆比容量可达146mAh/g。其与石墨烯复合后循环100周期后的比容量提高为323mAh/g。
[Abstract]:Lithium ion battery has become one of the most potential energy sources due to its high specific capacity, high voltage, long life and environmental protection. With the application of lithium-ion battery in the world, the demand for its performance has been improved, and the development of a new negative electrode material for lithium ion battery has become a hot spot. As a new type of material, metal-organic coordination polymers have been paid more and more attention on their electrochemical properties and their derivatives, and have become a good choice for anode materials of lithium ion batteries. In this paper, Fe containing organometallic coordination polymers and their derivatives have been successfully synthesized by hydrothermal method, and their applications in lithium ion batteries have been studied. The main contents are as follows: (1) A kind of iron and zinc was successfully synthesized by hydration. The structure and morphology of organometallic coordination polymers with one dimensional porous structure were characterized. Under the current density of 50mA/g, the specific capacity can reach 305 mg / g after 100 cycles. It was calcined in air as a precursor, and the first specific capacity of the oxide was 3 082 mg / g. The first specific capacity of carbon / oxide calcined in nitrogen is 1364mAh-1 / g, and after 100 cycles, the specific capacity can still be kept at 230 mAh-g. (2) by changing the ratio of iron and zinc, the organometallic coordination polymers with different structure can be obtained. The structure and morphology were characterized. At the current density of 50 Ma / g, the first specific capacity is 1621mAh-g. after 100 cycles, the specific capacity is still stable at 200mAh/ g. The oxides obtained by pyrolysis of the complex at high temperature have high specific capacity for the first time. The specific capacity of the carbon-coated metal oxide cycle is 260 m Ah/g. (3). Iron and zinc have been synthesized by hydrothermal method. The electrochemical measurements of lithium ternary organometallic coordination polymers show that the first specific capacity is high, up to 3636mAh/ g, but the cyclic stability is not good. The specific capacity of 100 cycles of the composites is up to 159mAh/ g by combining with graphene. The first specific capacity of the precursor after calcination is 1191 mAh/ g, and the reversible specific capacity of the precursor after 100 cycles is about 80 mAh / g. (4) the organometallic coordination polymers containing iron and manganese have been successfully synthesized, and their structure and morphology have been characterized. When it is used as electrode material, its first specific capacity is 1444mAh/ g, and the reversible specific capacity can reach 146mAh/ g after 100 cycles. The specific capacity of the composite with graphene was increased to 323mAh/ g after 100 cycles.
【学位授予单位】：沈阳工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：O641.4;TM912

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