摘要: LiFePO4目前被认为是最有潜力的锂离子二次电池正极材料之一,该材料具有原料来源广泛、环境友好、热稳定性好、比能量高、循环性能好、安全性能优异、无记忆效应等优点,被广泛用于纯电动汽车和混合动力汽车中。但目前LiFePO4正极材料仍存在电导率较低等不足,近年来的研究主要集中在改善LiFePO4材料的导电性能方面,本文从电池性能出发,用水热合成法,改变水热合成温度,采用扫描电子显微镜(SEM)、X射线衍射(XRD)等对材料的形貌结构和成分进行了分析,采用循环伏安等电化学表征手段,在水相电解液下测量LiFePO4的充放电等电化学性能。本文以FeSO4•7H2O、H3PO4和LiOH•H2O为主要原料,先以水热法合成前驱体,再经过高温焙烧,合成了橄榄石型的LiFePO4,系统研究了水热反应温度对产物的影响,同时得出在水热合成法下合成温度为180℃制得的LiFePO4具有最优性能。36287
毕业论文关键词:锂离子电池;水热合成法;正极材料;LiFePO4
Reaction Temperature on Material Properties
Abstract: LiFePO4 has recently become one of the most important cathode materials for Li-ion batteries,due to the abundance of raw materials,low cost,high safety nontoxicity, high energy density and excellent cycle performance.It is widely used in electric cars and hybrid vehicles. But, now LiFePO4 cathode material is still lack of conductivity, etc. In recent years, research has focused on improving the conductivity of LiFePO4 material, the paper starting from the battery performance, use hydrothermal method, change the hydrothermal temperature, using scanning electron microscopy (SEM), X-ray diffraction (XRD), the morphology structure and composition of the material was analyzed by cyclic voltammetry electrochemical characterization methods, measuring LiFePO4 electrochemical charge and discharge performance in the water phase electrolyte. In this paper, FeSO4 • 7H2O, H3PO4 and LiOH • H2O as the main raw material, first to hydrothermal synthesis of the precursor, and then after high temperature roasting, synthesized LiFePO4, studied the effect of water temperature on the thermal reaction products. Meanwhile obtained under hydrothermal synthesis method synthesis temperature is 180℃ to tain optimal performance of LiFePO4.
Key words:Li-ion batteries,Hydrothermal method,cathode materials,LiFeP04
目 录
第一章 绪论-- -1
1.1 引言-1
1.2 磷酸铁锂电池介绍-1
1.2.1磷酸铁锂电池的意义--1
1.2.2磷酸铁锂电池工作原理--2
1.2.3磷酸铁锂电池主要性能--3
1.3 磷酸铁锂锂电池的优缺点及行业应用4
1.3.1磷酸铁锂锂离子电池的优点--4
1.3.2磷酸铁锂锂离子电池的缺点--5
1.3.3 磷酸铁锂锂离子电池的行业应用-6
1.4磷酸铁锂锂离子电池的合成方法及测试方法-7
1.4.1磷酸铁锂电池的合成方法--7
1.4.2磷酸铁锂电池的电化学性能测试方法--8
第二章 实验方法-9
2.1 实验试剂-9
2.2 实验仪器-9
2.3 实验方法14
2.3.1拟采取的实验方案--14
2.3.2实际实验方法与步骤--15
第三章 实验数据测试与分析 18
3.1 XRD图分析18
3.2 SEM图像分析19
3.3C性循环伏安图分析--20
第四章 结论-30
4.1结论-30
4.2展望-30
致谢--31
参考文献--31
第一章 绪论 LiFePO4的充放电反应温度对材料性能的影响:http://www.751com.cn/cailiao/lunwen_34658.html