摘要：本论文就硫参杂石墨纳米笼的制备以及其作为钠离子电池的负极材料上的应用进行研究和讨论。

使用浮动催化裂解法，即以含铁有机物为催化剂，以二硫化碳为碳源，铁催化剂在高温下分解为铁的纳米颗粒，碳原子融入铁纳米颗粒的内部，硫原子参杂其中，待其饱和后，会在铁颗粒表面析出碳层，从而得到硫参杂碳纳米颗粒。之后再经过酸洗，将碳纳米颗粒内部的铁除去，通过X射线衍射仪（XRD）、高分辨率透射电子显微镜（HRTEM）以及X射线光电子能谱(XPS)，对制得的样品进行定性分析和形貌观察，发现所制得的样品为硫参杂石墨纳米笼。72620

然后将样品组装成电池，对其进行电化学测试，主要进行恒流充放电测试，循环性能和比容量。测试结果表明，虽然首次放电后不可逆容量的损失依旧较大，但在不同电流密度下多次循环后仍能保持一定的比容量，说明制得的钠离子电池具有良好的循环稳定性。在电流密度0。2 A /g、0。5 A /g、1 A /g和3 A /g分别对应的比容量为84。6 mAh/g、58。1 mAh/g、37。8 mAh/g和18。3 mAh/g。制得的样品是一种中空的纳米球，其具有丰富的孔道结构，有利于钠离子的嵌入与脱出，使它的储钠能力得到提高，有效的提高钠离子电池的性能。

综上所述，硫参杂石墨纳米笼在钠离子电池负极上有一定的应用前景。

毕业论文关键词: 石墨纳米笼；掺杂；碳材料；比容量；钠离子电池

Study on Synthesis of Sulfur-doped Graphitic Nanocages for Anode of Sodium Ion Batteries

Abstract:In this paper, the preparation of sulfur nanocomposites and its application as anode materials for sodium ion batteries were studied and discussed。

The use of floating catalytic cracking method, that is, iron-containing organic matter as a catalyst to carbon disulfide as carbon source, iron catalyst at high temperature decomposition of iron nanoparticles, carbon atoms into the iron nanoparticles inside the sulfur atoms mixed with them to be saturated, The carbon layer is precipitated on the surface of the iron particles to obtain sulfur-containing carbon nanoparticlesby pickling and then removing the iron inside the carbonnanoparticles。 X-ray diffraction(XRD), high-resolution transmission electron microscopy (HRTEM) and X-ray photoelectron spectroscopy (XPS) were used to characterize the prepared samples Analysis and morphology observation, found that the prepared samples for the sulfur mixed with graphite nanocage。

Then the sample is assembled into a battery, for electrochemical testing: charge and discharge test,cycle performance and specific capacity。 The test results show that although the loss of irreversible capacity after the first discharge is still large, the specific capacity can be maintained after repeated cycles at different current densities, which indicates that the prepared sodium ion battery has good cycle stability。 The specific capacities were 84。6 mAh / g, 58。1 mAh / g, 37。8 mAh / g and 18。3 mAh / g, respectively, at current densities of 0。2 A / g, 0。5 A / g, 1 A / g and 3 A / g, respectively。 The prepared sample is a hollow nanosphere, which has rich pore structure, which is beneficial to the embedding and dissociation of sodium ions, so that its sodium storage capacity is improved, and the performance of sodium ion battery can be improved effectively。

In summary, asanode in the sodium ion battery,sulfur-doped graphite nanocage has a good application prospects。

KeyWords: Graphite nanocages; Doping; Carbon materials; Specific capacity; Sodium ion batteries 

目录

1 绪论 1

1。1 钠离子电池概述 1

1。1。1 钠离子电池的工作原理