pH对LiFePO4的影响研究(制备和性能)
关键词： LiFeP04；水热法；碳包覆；电位差
Effect of pH on LiFePO4
Abstract：The cathode materials are widely either used LiCoO2 or LiMnO2 because of the high reversible capacities．However, LiCoO2 is toxic and causes collapse of construction for overcharge．LiMnO2 are limiting for the cycling and thermal stability．Lithium iron phosphate(LiFePO4) has been regarded as one of the most promising cathode materials，due to its lower cost，improved safety, highly reversible and repeatable property, this material was intended for Hybrid Electric Vehicle(HEV) and plug—in hybrid electric vehicles (PHEV)．However, due to the low electronic conductivity and ionic diffusion coefficient of lithium LiFePO4,the rate charge and discharge performance is poor, which limits its application in hybrid cars. With the deepening of research, research on the effects of pH on the performance of LiFePO4 caused people's concern. Experiments with FeSO4、NH4H2PO4、LiOH and C6H17N3O7 as raw materials, using hydrothermal synthesis high performance of LiFeP04 cathode material and discusses the influence of pH value on the preparation and properties.
KeyWords： Lithium iron phosphate；Hydrothermal method；Carbon coating；Potential difference
目 录
1 绪论 1
1.1 研究的目的 1
1.2 研究的意义 1
1.3 锂离子电池的概述 1
1.3.1 锂离子电池的结构 1
1.3.2 锂离子电池的工作原理 3
1.4 LiFePO4正极材料概述 4
1.4.1 LiFePO4的结构特点及充放电过程 [15] 4
1.4.2 iFePO4的锂离子脱嵌机制 5
1.4.3 LiFePO4正极材料的改性技术 6
1.4.4 LiFePO4的制备方法 6
1.5 实验过程 8
1.5.1 水热法 8
1.5.2 材料制备 9
1.5.3 pH的选择 9
1.5.4 样品的表征方法 9
1.6 预期的结果 10
1.7 实验仪器 10
2 实验设备及设备简介 11
2.1 循环水式多用真空泵：SHB-III 11
2.2 热处理设备 12
2.2.1 管式炉的概述 12
2.2.2 管式炉的优缺点 12
2.3 日本理学DMAX-B型X射线衍射仪 13
2.3.1 X射线衍射仪的结构 13
2.3.2 X射线衍射仪的工作原理 13
2.4 电化学工作站：CHI-660 13
2.4.1 概述 13
2.4.2 电极 14
2.5 数控超声波清洗器 14
2.5.1 概述 14
2.5.2 原理 14
2.6 电子分析天平 15
2.7 磁力加热搅拌器 15