摘要经济全球化的发展以及能源不断高涨，使得人们对于寻求新的储能装置越来越向往。锂离子电池（LIB）被认为是综合性能最好的电池体系，具有许多无可比拟的优点如高比能量，高循环寿命，体积小，质量轻，无记忆效应，无污染等，并迅速发展成为新一代储能电源，广泛应用于信息技术，电动车和混合动力车，航空航天等领域。具有良好的导电性的复合材料是由金属氧化物和石墨烯复合而成的，可以用来制备成锂电池的薄片。86214

本实验以均苯三甲酸、硝酸钴、磷钨酸、氯化铁及表面活性剂合成多酸基金属有机骨架，通过改变反应条件，诸如：活性剂的量、实验合成方法、煅烧的条件；得到具有不同表面形貌的Co3O4孔状纤维和Fe3O4/WO3复合纳米颗粒。然后对材料分别进行XRD、SEM、TEM等表征，并进行电化学性能测试。结果表明，四氧化三钴在第一圈的放电容量达到1230 mAh，当电流密度为50 mA/g时，四氧化三钴的充放电容量为996 mAh左右，库伦效率为95%左右。随着循环次数的增加达到50圈时，充放电容量维持在800 mA/g，库伦效率也维持在95%左右没有衰减。四氧化三铁库伦效率较高，基本维持在95%左右稳定，其充放电容量开始为1300 mAh，随着循环次数的增加，有所衰减。

毕业论文关键词：四氧化三钴、四氧化三铁、氧化钨、复合材料、锂电池

AbstractWith the process of economic globalization and rising energy ,seeking for new energy storage devices has become a new hot spot in the field of concerning energy。 Lithium-ion battery (LIB) is currently the best overall performance of the battery system, with high specific energy, high cycle life, small size, light weight, no memory effect, and no pollution, and quickly developed into a new generation of energy storage power, which support for the power of information technology, electric and hybrid vehicles, aerospace and other fields。 graphene composite material mixed from metal oxide and carbon has good electrical conductivity, which can be used to prepare a thin lithium battery。

In this experiment, the acid-based metal organic framework is based on trimesic acid, cobalt nitrate, phosphorous acid, ferric chloride and a surfactant, by changing the reaction conditions, such as the amount of the active agent, the experimental synthesis, calcination conditions; we can obtain Co3O4 porous fibers and Fe3O4/ WO3 composite nanoparticles with different surface morphologies and those materials were characterized by XRD, SEM, TEM。 The electrochemical performance test results show that on the first lap of the discharge capacity ratio cobalt oxide is up to 1230 mAh, when a current density is up to 50 mA/g, the discharge capacity of the cobalt oxide was 996 mAh or so, Coulomb efficiency is about 95%。 With the number of cycles is up to 50, charge and discharge capacity was maintained at 800 mAh , coulombic efficiency is maintained at about 95% which did not decay。 Iron oxide high coulombic efficiency, remaining stable at around 95%, the charge-discharge capacity is up to 1300 mAh in the beginning, with the increase of cycles, it begins to somewhat attenuated。

Key words: Cobalt oxide, iron oxide, tungsten oxide, composite materials, lithium battery

目 录

第一章 绪 论 1

1。1引言 1

1。2锂离子电池的简介 1

1。2。1锂离子电池的发展简史 1

1。2。2 锂离子电池的工作原理 2

1。2。3 锂离子电池的组成 4

1。2。4锂离子电池的特点 6

1。3过渡金属氧化物在锂电池中的研究进展