-
摘要：本毕业论文研究了锂离子电池正极材料LiCo1-xFexPO4正极材料合成及充放电性能研究。研究中使用纳米球磨法以及喷雾干燥法制备正极材料，通过初次煅烧制备前躯体，而后在高温不同的气氛下进行煅烧等一系列手段获得磷酸钴铁锂正极材料。在实验过程中，通过调整产品原料合成的各项参数，如调控Fe和Co的比例制备一系列LiCo1-xFexPO4进行对比分析；设定不同的煅烧气氛、时间和温度。这些不同的LiCo1-xFexPO4样品使用XRD等分析手段对其进行物相表征分析。我们通过搀杂Fe元素来使纯相的LiCoPO4的电化学性能得到一定的提升，且掺杂含量不宜过多，通过实验数据表明Fe掺杂含量为5％时电化学性能较好。这种电化学性能的提升是由于掺杂Fe元素提高了磷酸钴锂材料的循环稳定性，从而提高了材料的电化学性能。23238
- 上一篇：液相等离子体法制备碳基纳米固体润滑剂
- 下一篇：载CeO2有序介孔吸附剂的制备及其燃油脱硫性能研究
毕业论文关键词：磷酸钴铁锂；纳米球磨法；喷雾干燥；高温真空煅烧；材料表征
The Synthesis of LiCo1-xFexPO4 Cathode Material and the Study on the Discharge Performance
Abstract:This paper studied the discharge performance of positive electrode materials of lithium ion battery cathode material LiCo1-xFexPO4 synthesis and filling. Nanometer ball milling and spray drying method are used to prepare cathode materials, and we prepare the precursor by first calcined, and then obtain calcined cobalt phosphate of lithium iron at high temperature and different atmosphere. In the experiment, a series of LiCo1-xFexPO4 were analyzed by adjusting the parameters of product raw materials, such as the regulation of Fe and the ratio of Co; setting different calcination atmosphere, temperature and time. The phase characterization of these different LiCoFePO4 samples are analyzed by using XRD, SEM and other analysis methods. The electrochemical properties of pure phase of LiCoPO4 have been improved through doping Fe element, but the doping content should not be too much. The experimental data shows that we could get better electrochemical properties under 5% Fe doping content. The reason of the improvement of electrochemical properties is that the doping elements reduces the resistivity of lithium cobalt phosphate material.
Keywords: LiCoFePO4; Nanometer ball milling; spray drying; high-temperature calcination; materials characterization
目 录
1. 绪论 1
1.1 锂离子电池简介 1
1.1.1 锂离子电池的发展史 1
1.1.2 锂离子电池的用途及原理 2
1.1.3 锂离子电池组成 3
1.1.4 正负极材料 3
1.1.5 电解液 3
1.1.6 隔膜 4
1.2 课题内容 4
1.2.1 课题研究的目的和意义 4
1.2.2 课题研究内容 5
1.2.3 实验方案设计 5
2.1 药品的选用 6
2.2 仪器和设备 6
2.3 喷雾干燥法简介 7
2.4 材料制备及工艺优化 8
2.4.1 煅烧时间的影响 8
2.4.2 煅烧温度的影响 8
2.4.3 煅烧气氛的影响 8
2.5 电极制备 9
2.6 电池装配 9
3 结果与讨论 10
3.1 LiCol-xFexPO4的XRD物相分析 10
3.1.1煅烧时间的影响 10
3.1.2 煅烧温度的影响 10
3.1.3 煅烧气氛的影响 12
3.1.4 不同含量的LiCo1-xFexPO4的XRD物相分析 13
3.2 LiCo1-xFexPO4的电化学性能分析 16
3.2.1不同掺Fe含量的LiCo1-xFexPO4的CV曲线分析 16
3.2.2不同掺Fe含量的 LiCo1-xFexPO4的首次放电循环曲线分析 18