PVP对三元材料的影响
关键词：锂离子电池；三元正极材料；水热法；PVP；循环伏安；合成工艺
Abstract
Abstract: Lithium ion batteries are currently the most widely used energy storage and conversion devices, lithium-rich oxide is concerned, due to its large operating voltage range, good thermal stability, ternary cathode material also has great prospects for development. But in fact it still has some problems, which hinder the further application, such as the poor lithium ion diffusion rate and poor electrical conductivity. PVP can reduce nano diffusion path of lithium ions, as a surfactant to improve conductivity, a good solution to the problem of lithium ion deintercalation enhance lithium ion diffusion capacity, reduce electrode polarization. During this experiment, we added PVP ternary cathode material by hydrothermal synthesis method, and its modification to obtain PVP can greatly improve the electrochemical properties of the cathode material. In addition, by changing various experimental parameters such as reaction time, sintering temperature, solvents, we used cyclic voltammetry and electrochemical impedance spectroscopy characterization methods to make comparative analysis of electrochemical performance under all conditions, and then to develop a better synthesis. In conclusion, when PVP’s solvent is ethanol, the reaction time is 10h, the sintering temperature is 700 ℃ , the Li [Li0.12Mn0.54Ni0.13Co0.13] O2 obtained the best performance.
Keywords: Lithium-ion battery; ternary cathode material; hydrothermal; PVP; cyclic voltammetry; Synthesis
目录
1．绪论 1
1.1锂离子电池的发展现状 1
1.2锂离子电池工作原理 1
1.3锂离子电池正极材料的研究现状 2
1.4 锂离子电池正极材料的合成方法 3
1.4.1高温固相法 3
1.4.2共沉淀法 3
1.4.3溶胶－凝胶法 3
1.4.4水热法 4
1.4.5其他方法 4
1.5 PVP对正极材料的改性 4
1.5.1 PVP作为碳源改性研究 4
1.5.2 PVP作为表面活性剂改性研究 5
1.6选题目的、内容及意义 5
2．实验药品及仪器 6
2.1实验药品 6
2.2实验仪器 7
3.实验原理及测试方法 7
3.1实验原理 7
3.2测试方法 8
3.2.1工作电极制作 8
3.2.2三电极测试系统循环伏安测试 8
3.2.3循环伏安测试(CV) 8
4.实验与表征 9
4.1 样品制备 9
4.2.不同反应时间对水热法三元正极材料的合成及表征 9