微波溶剂热法制备锰取代磷酸钴锂正极材料及其电化学性能表征
毕业论文关键词：磷酸钴锰锂；微波溶剂热法；喷雾裂解法；电化学性能；XRD
Abstract
Abstract:The main content of this paper is the high-voltage lithium-ion battery cathode material LiCo1-xMnxPO4 (0.1≤x≤0.5) with Mn substitution prepared by microwave solvothermal. Using the method of microwave assisted heating, Synthesis LiCo1-xMnxPO4 fast (200 ℃, 20min) at low temperature, Using the method of microwave assisted heating, Synthesis LiCo1-xMnxPO4 fast (200 ℃, 20min),at low temperature, combined with Spray pyrolysis method to coat it with carbon, to get LiCo1-xMnxPO4 ,so as to enhancing the conductivity and cycling stability of the material. Through adjusting the ratio of Mn, contrast the effect of the different ratio of Mn Substitution on the topography and electrochemical properties of material. From the XRD tests, we found that with the increase of Mn content, the low angle diffraction peak shift, indicating that synthetic materials was solid solution LiCo1-xMnxPO4 with Mn subtutition, and Mn substitution parameters affect the cell structure. After electrochemical performance tests found, the discharge capacity, cycling stability of LiCo0.7Mn0.3PO4 performanced better.
KeyWords: Manganese lithium cobalt phosphate; Microwave solvothermal; spray pyrolysis method; Electrochemical performance; XRD
目 录
1 绪论 1
1.1 锂离子电池的发展现状 1
1.1.1 锂离子电池的工作原理 2
1.1.2 锂离子电池正极材料 4
1.1.3 常用的LiCoPO4合成方法 7
1.2 课题的研究目的及要求 7
1.2.1研究目的 8
1.2.2研究要求 8
2 实验 8
2.1 药品与仪器 8
2.1.1 实验药品 8
2.1.2 实验仪器 9
2.2 实验内容 10
2.2.1 LiCol-xMnxPO4粉体材料的合成 10
2.2.2 正极片的制备方法 12
2.2.3 电池装配 12
2.3 实验优化 12
2.3.1 掺杂Mn2+ 13
2.3.2 微波反应的温度和时间 13
2.3.3 煅烧参数的确定 13
2.4 材料表征 14
2.4.1 XRD检测 14
2.4.2 粒度测试 14
2.4.3 碳硫分析 14
2.4.4 电化学性能测试 15
3 结果与分析 16
3.1 LiCol-xMnxPO4的物相分析 16
3.2 LiCol-xMnxPO4的粒度分析 17
3.3 LiCol-xMnxPO4的碳硫分析 20
3.4 LiCol-xMnxPO4的电化学性能分析 21
4 结论 31
5 前景与展望 31
致谢 32
参考文献 32
1 绪论
1.1 锂离子电池的发展现状
在快速发展的今天，我们所面临的最严峻的问题莫过于能源和环境。由于我国经济的高速发展，对能源的消费需求也与日俱增。基于中国的基本国情来说，对清洁的再生能源以及绿色环保的新型能源的需求非常之大。化学电池中的锂电池正好迎合这个节约能源、保护环境的发展目标。