《硅-硅氧化物-锡-碳复合物论文：锂离子电池负极材料硅—硅氧化物—锡-碳的制备及性能研究》由会员分享，可在线阅读，更多相关《硅-硅氧化物-锡-碳复合物论文：锂离子电池负极材料硅—硅氧化物—锡-碳的制备及性能研究（5页珍藏版）》请在金锄头文库上搜索。
1、 硅-硅氧化物-锡/碳复合物论文：锂离子电池负极材料硅硅氧化物锡/碳的制备及性能研究【中文摘要】碳材料作为锂离子电池负极材料,具有很好的循环寿命和安全性。尽管碳材料表现出良好的可逆性和循环性,但理论比容量只有 372 mAh g-1,无法满足高能量密度的电子产品和电动车用锂离子电池的需要。作为锂离子电池负极材料硅具有最高的理论比容量(4200 mAhg-1),锡也具有较高的理论比容量(994 mAhg-1).但是,在电池充放电过程中,随着锂离子的嵌入和脱出,其体积膨胀和收缩很大而很容易碎裂,导致电极被破坏而在几个循环后容量衰减很快,甚至消失。因此,目前大量的研究工作者都致力于研究和解决其循环性
2、能差的问题。本论文根据大量的国内外文献资料调研,紧跟该领域的研究前沿,采用碳热【英文摘要】Carbon materials are utilized as anode materials for the improvement of safety and cycle life in lithium batteries. Although carbon materials show good reversibility and stability for cycles, their specific capacities are limited to 372 mAh g-1.It cant sa
3、tisfied the demands of high-energy-density lithium batteries in electronics and electrical vehicles.As anode materials for Li-on batteries, silicon has a highest theoretical specific capacity of 4200 mAh g-1, tin has aspecific capacity of 994 mAh g-1. But silicon and tin undergo large volumetric cha
4、nge during lithium insertion, it is regarded that the expansion and contraction of lithium silicide during the charge-discharge cycling leads to the pulverizing of Si and Sn powder is formed.It would cause the breakdown of the electrode materials, resulting in the loss of capacity within several cyc
5、les. Therefore, many research works were carried out on methods to study and improve its cycle life in recent years.This dissertation is a result of research work in the area of Li-ion batteries, and it is believed that the subject under study is a frontier of current research topics. The modified S
6、i-SiOx-Sn/C has been synthesized by a carbon thermal reduction method and a high temperature solid-state method, the influence of various temperatures and modify were investigated in this work through a series of experiments, and following conclusions were drawn:1. Si-SiOx-Sn/C composites were prepa
7、red by a carbon thermal reduction method. The electrochemical performance of the composites as anode material for lithium-ion batteries was studied.The composites were prepared at different temperature in nitrogen flow, and colded to room-temperature naturally. The Si-SiOx-Sn/C (950) composites show
8、ed the best electrochemical performance. The composites can deliver a specific capacity of 1475 mAh g-1 at 150 mA g-1.They have a higher specific capacities after sixty cycles.2. Modified Si-SiOx-Sn/C composites were synthesized by polymerization of furfuryl alcohol and solid phase synthesis process
9、. The characteristics of the composites as anode material for lithium-ion batteries were investigated by scanning electron microscopy (SEM) and X-ray diffraction (XRD) methods. The electrochemical performance of the anode material was studied. Si-SiOx-Sn/C composites have a discharge specific capaci
10、ty of 1595 mAh g”and a charge specific capacity of 575 mAh g-1 at 150 mA g-1. Modified Si-SiOx-Sn/C composites have a higher discharge specific capacity of 1475 mAh g-1 and a higher charge specific capacity of 712 mAh g”1 at 150mA g-1 than Si-SiOx-Sn/C composites. Modified Si-SiOx-Sn/C composites ca
11、n display a specific capacity of 1628 mAh g-1 at 90 mA g-1,1595 mAh g-1 at 150 mA g-1 and 1184 mAh g-1 at 225 mA g”.The specific capacities have decreased with the increasing of their current density. After 120 cycles, the specific capacities have retained at 60% comparing to the 20th. Obviously, Mo
12、dified Si-SiOx-Sn/C composites exhibited high specific capacities, good cyclability and excellent electrochemical performance of the anode material for lithium-ion batteries.【关键词】硅-硅氧化物-锡/碳复合物 锂离子电池 负极材料 电化学性能【英文关键词】Si-SiO_x-Sn/C composite lithium-ion battery anode material electrochemical performan
13、ce【目录】锂离子电池负极材料硅硅氧化物锡/碳的制备及性能研究 摘要 3-5 ABSTRACT 5-6 第 1章 文献综述 9-25 1.1 前言 9 1.2 锂离子电池的发展历程 9-11 1.3 锂离子电池的组成及其工作原理 11-12 1.4 锂离子电池负极材料的研究进展 12-23 1.4.1 锂离子电池负极材料的选择原则 12-13 1.4.2 金属锂及其合金 13-14 1.4.3 碳负极材料 14-16 1.4.4 非碳负极材料 16-23 1.5 本论文的主要研究目的和内容 23-24 1.6 本论文的创新之处 24-25 第 2 章 实验药品与方法及原理 25-30 2.1
14、实验主要化学药品 25 2.2 实验主要装置 25-26 2.2.1 管式电阻炉 25 2.2.2 真空干燥箱 25-26 2.2.3 手套箱 26 2.3 钮扣电池的装配 26 2.3.1 电极的制备 26 2.3.2 隔膜与电解液 26 2.4 材料的物理性能表征 26-27 2.4.1 物相分析 26-27 2.4.2 扫描电子显微镜 27 2.5 材料的电化学性能测试 27-30 2.5.1 恒流充放电技术 27-28 2.5.2 循环伏安法(CV) 28-29 2.5.3 交流阻抗测试(EIS) 29-30 第 3 章 碳热还原法制备硅-硅氧化物-锡/碳复合物及电化学性能研究 30-36 3.1 概述 30 3.2 材料的制备 30-31 3.3 材料的表征 31-32 3.3.1 材料的结
