摘要：锂离子电池是二十世纪九十年代开始发展的新型的高性能电池。在此之前，人类大量使用不可再生能源使得资源几近枯竭，新型能源的发展迫在眉睫，而这也催生了对储能设备的高需求。在这种背景之下，新型能源存储设备的快速发展已成为大势所趋，而锂离子电池作为其中必不可少的储能设备之一已得到广泛应用。开发出锂电池更加优异的性能是每位相关学者的目标。

本研究中，我们采用了化学气相沉积法制备了碳包硫化亚铁纳米复合颗粒，并测试了这些样品的电化学性能。通过900 ℃和1100 ℃的热裂解可以得到FeS@C纳米颗粒，通过在x射线衍射和高分辨电镜对碳包硫化亚铁纳米颗粒进行测试，均证明在所选的制备条件下，较高温度（1100 ℃）热裂解制得的纳米颗粒具有更好的结晶度。80984

我们用制得的碳包硫化亚铁纳米复合颗粒作为负极材料组装锂电池，并测试其电化学表现。经过倍率测试，循环伏安测试，充放电测试，交流阻抗测试等各项电化学测试可以得出其所制电极在0。1 A g-1电流密度下，放电比容量达到600 mA g-1以上。

毕业论文关键词：锂离子电池；硫化亚铁；碳包覆；电极材料；化学气相沉积

Synthesis of FeS nanoparticles encapsulated with carbon shells and their application in lithium ion batteries

Abstract: Lithium-ion battery is the 20th century, the nineties began to develop a new high-performance battery。 Prior to this, a large number of human use of non-renewable energy makes the resources almost depleted, the development of new energy imminent, and this also gave birth to the high demand for energy storage equipment。 Under this background, the rapid development of new energy storage devices has become a general trend and lithium-ion batteries as one of the essential energy storage equipment has been widely used。 The development of lithium batteries is more excellent performance is the goal of each relevant scholar。

In this study, carbon nanocomposite nanocomposite particles were prepared by chemical vapor deposition and the electrochemical properties of these samples were tested。 FeS@C nanoparticles can be obtained by thermal cracking at 900 ℃ and 1100 ℃。 The carbon nanotubes nanocomposites were tested by x-ray diffraction and high resolution electron microscopy。 It was proved that under the selected preparation conditions, the higher temperature (1100 ℃) thermal cracking of the prepared nanoparticles with better crystallinity。

We assembled the lithium battery with the carbon nanocrystalline nanocomposite particles as the anode material and tested the electrochemical performance。 After cyclic voltammetry test, charge and discharge test, AC impedance test and other electrochemical tests, specific capacity of the FeS@C-based electrode was over 600 mAh/g, at current density of 0。1 A/g。

KeyWords：Lithium ion battery; FeS; Carbon encapsulated structure; Electrode materials; Chemical vapor deposition

目录

1 绪论 1

1。1 锂电池的发展 1

1。2 锂电池的分类 1

1。3 锂电池的原理 2

1。4 常见的锂离子电池正极材料 2

1。5 常见的锂离子电池负极材料 3

    1。5。1 石墨化碳材料 3

1。5。2 无定形碳材料 4

1。5。3 过渡金属氧化物 4

1。5。4 合金类材料 5

1。5。5 金属硫化物