原位聚合氮化碳-石墨烯纳米复合材料及其性能研究

摘要本文利用二氰二胺(C2H4N4)与氧化石墨烯（GO）通过原位聚合反应，制备了不同配比的共价键键合的氮化碳-石墨烯纳米复合材料，并对其进行了结构与形貌的表征，在此基础上研究了该复合材料的形成机理：
首先GO上的环氧基团与C2H4N4发生亲核取代反应，形成通过C-N共价键连接的C2H4N4-GO化合物，在高温下C2H4N4原位聚合形成g-C3N4，GO也发生热还原，从而形成共价键合的g-C3N4-rGO。33996
将g-C3N4-rGO作为锂离子电池负极材料，在100 mA•g-1的电流密度下进行50次循环后，可逆充放电容量达到1525 mA•h•g-1；即使在1000 mA•g-1的大电流密度下，仍有943 mA•h•g-1的可逆容量。
此外，利用水热法制得铁酸镍/石墨烯/氮化碳三元纳米复合材料，为进一步深入探索氮化碳-石墨烯复合材料体系奠定了基础。
关键词氮化碳石墨烯协同效应锂离子电池
毕业论文设计说明书外文摘要
Title Study on preparation and properties of carbon nitride/ graphene nanocomposite by in situ polymerization
Abstract
In this paper, the covalently coupled hybrid of graphitic carbon nitride (g-C3N4) with reduced graphene oxide (rGO) with differing g-C3N4/rGO ratio was prepared via in situ polymerization approach. Based on the analysis of the structure and morphology of the composites, the formation mechanism can be explained:
The epoxy groups of graphene oxide (GO) undergo a nucleophilic substitution reaction with dicyandiamide (C2H4N4) to form the C2H4N4-GO composite via covalent C-N bond, then both the in situ polymerization of C2H4N4 and thermal reduction of GO can be achieved at higher temperatures, forming the covalently coupled g-C3N4-rGO.
The lithium-storage performance of g-C3N4-rGO as the anode material for lithium-ion batteries has been studied. The g-C3N4-rGO exhibits an unprecedented high, stable and reversible capacity of 1525 mA•h•g-1 at a current density of 100 mA•g-1 after 50 cycles. Even at a large current density of 1000 mA•g-1, a reversible capacity of 943 mA•h•g-1 can still be retained.
Besides, nickel ferrite/graphite/carbon nitride nanocomposites have been prepared by hydrothermal method and characterized.
Keywords carbon nitride graphene concerted effects lithium-ion batteries
目次
1 引言    1
1.1 石墨烯概述    1
1.1.1 石墨烯的制备方法    2
1.1.2 原位聚合法制备石墨烯/聚合物复合材料    2
1.2 氮化碳概述    3
1.2.1 氮化碳的制备方法    4
1.3 锂离子电池简介    4
1.3.1 锂离子电池的结构和工作原理    4
1.3.2 锂离子电池负极材料    5
1.4 本文的研究思路和内容    6
2 氮化碳-石墨烯纳米复合材料的制备    8
2.1 实验药品    8
2.2 测试仪器    8
2.3 实验制备方法    9
2.3.1 氮化碳的制备    9
2.3.2 氮化碳-石墨烯二元纳米复合材料的制备    9
2.3.3 铁酸镍/石墨烯/氮化碳三元纳米复合材料的制备    9
2.3.4 锂离子电池的组装    10
3 氮化碳-石墨烯纳米复合材料的表征与储锂性能研究    11
3.1 氮化碳-石墨烯纳米复合材料的结构与形貌    11
3.1.1 红外分析    11
3.1.2 核磁共振分析    12
3.1.3 X射线衍射光谱分析    13 原位聚合氮化碳-石墨烯纳米复合材料及其性能研究:http://www.751com.cn/huaxue/lunwen_31347.html