摘要：本课题利用氧化石墨烯的独特结构与性质，制备出了氧化石墨烯包覆的中空的粒径可控的三氧化二铁复合材料GHFs，并测试其锂离子电池的电化学性能与电容器性能。通过控制反应原料，反应溶剂，反应条件，制备出颗粒大小均匀，且颗粒可以控制分布从2000nm至50nm，且大于300nm的颗粒为明显中空结构。以300nm大小三氧化二铁颗粒为例，作为电极材料，在100mA/g，循环50次后，其锂离子电池性能950mAh/g，并且在高电流密度1000mA/g下，容量仍高达640mAh/g。该材料说明三氧化铁颗粒大小，中空结构，石墨烯和三氧化二铁之间的协同作用，石墨烯包覆结构不仅可以提高材料的传输电子速度和脱嵌锂离子能力，而且可以减缓GHFs的体积效应，从而提高复合材料的锂离子电池性能。用于超级电容器测试时，在1A/g条件下，其容量密度为350F/g，循环500次以后，基容量密度几乎不变。39200
毕业论文关键词：石墨烯；中空三氧化二铁；碳包覆；锂离子电池；超级电容器
Preparation and Application of Self-assemble Graphene-constructed Hollow Fe2O3 with Size Controlled
Abstract:In this article,Graphene oxide was used as substrate to prepare graphene-based Fe2O3, the electrochemical properties of the composites were evaluated.We improve the situation of the reaction,ough change materials, solution, the reaction situation,we success fabricated graphene constructed hollow Fe2O3 spheres with size ranged from 2000nm to 50nm and Fe2O3 spheres more than 300nm show a hollow structure.As the anode material in LIBs,the GHFs showed excellent reversible specific capacity of 950mAh/g after 50 cycles at a current density of 100mA/g and maintained the specific capacities of 640mAh/g at the ultrahigh current densities of 1000mA/g,respectively.The intriguing results can be attributed to the hollow structure, uniform dispersion, controllable size of Fe2O3,and the synergistic interaction between Fe2O3 and graphene aerogel, graphene can not only improve electrical property and rate of li-ion,but also release volume change so graphene can improve the electrical property of complex material.GHFs was applied as anode material of supercapacitor, a reversible specific capacity of 350F/g after 500 cycles at a current density of 1A/g and maintained the specific capacities of 350F/g after 500 cycles.
Keywords:Graphene; hollow Fe2O3; graphene constructed materials; Lithium-ion Batteries
目录
1 绪论 1
1.1 研究背景 1
1.2 石墨烯和氧化石墨烯简介 1
1.2.1 石墨烯和氧化石墨烯的结构 2
1.2.2 石墨烯和氧化石墨烯的性能 4
1.3锂离子电池的研究进展 4
1.3.1 锂离子电池概述 4
1.3.2 锂离子电池的优点及不足 5
1.3.3 石墨烯基锂离子电池 6
1.3.4 锂离子电池电极材料材料表面包覆研究进展 8
1.4 研究的目的与意义 9
1.4.1 研究的意义 9
1.4.2 研究内容 10
2 实验内容 11
2.1 实验试剂与仪器 11
2.1.1 实验试剂 11
2.1.2 实验仪器 11
2.2 实验内容 12
2.2.1 氧化石墨烯包覆的椭球形三氧化二铁材料的制备 12
2.2.2 电极材料的制备及锂离子电池的组装 12
2.2.3 二氯化铁的制备 13
2.2.4 氧化石墨烯包覆的椭球形三氧化二铁材料（Fe2O3/RGO）的制备 13 自组装合成石墨烯包覆粒径可控的三氧化二铁复合材料制备与应用研究:http://www.youerw.com/huaxue/lunwen_39589.html