LiFeNiPO4的性能探讨研究
the performance of LiFeNiPO4
Abstract: 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.However, due to the low electronic conductivity and ionic diffusion coefficient of lithium LiFePO4,the rate charge and discharge performance is poor.To improve the performance of LiFePO4, single phase Li1- xNixFePO4 was prepared by hydrothermal reaction. The LiFe1–xNixPO4 materials, which were doped by using Ni replace the Fe site in the lattice of LiFePO4, respectively, were synthesized via a hydrothermal method. The electrochemical performance of the synthesized samples were characterized. The results indicated that the doping could increased the conductivity of the LiFe1–xNixPO4, decreased the Li+ diffusion resistance, and dramatically increased the electrochemical performance of the LiFe1–xNixPO4.
Key words: lithium iron phosphate; ion doping; electrochemical performance
目 录
1 文献综述 1
1.1 绪论 1
1.1.1 引言 1
1.1.2 锂离子电池的工作原理 1
1.1.3 锂离子关键部件简述 3
1.1.4 LiFePO4的结构 6
1.1.5 LiFePO4的充放电机理 6
1.1.6 LiFePO4的容量计算 7
1.1.7 LiFePO4合成方法 8
1.1.8 LiFePO4 存在的问题与改性 10
1.2 国内外研究现状 12
1.3 LiFexNi1-xPO4正极材料的水热法制备 13
1.3..1 引言 13
1.3.2 LiFexNi1-xPO4粉体制备 13
1.3.3 高温煅烧 14
1.3.4 实验设备 14
1.4 文献综述的目的及意义 14
2 实验设备和药品 15
2.1 实验设备及设备简介 15
2.1.1 真空干燥箱 15
2.1.2 电子分析天平 16
2.1.3 磁力加热搅拌器 18
2.1.4 数控超声波清洗器 19
2.1.5 电化学工作站 20
2.1.6 循环水式多用真空泵 20
2.1.7 高温干燥箱 22
2.2 实验药品 22
3 实验内容 23
3.1 原始试样的制备 23
3.2 活性物质的制备 24
3.3 对电极材料的测试 25
3.3.1 循环伏安测试 25
3.3.2 XRD测试 27
4 结果及分析 27
4.1 XRD衍射曲线 27
4.2 CV曲线 30
5 展望 35
致 谢 36