Al掺杂对富锂正极材料0.4Li2MnO3-0.6LiMO2电化学性能的影响研究
毕业论文关键词：Li2MnO3；纳米球磨；喷雾干燥；Al掺杂
The impact of Al doping on the electrochemical performance of 0.4Li2MnO3-0.6LiMO2 anode materials in lithium battery
Abstract
0.4Li2MnO3-0.6LiMO2（M= Mn、Co、Ni、Al）was synthesized by ball-milling and spray drying process followed with high-temperature calcinations. The impact ofLi content,calcination temperature and Al doping content on 0.4Li2MnO3-0.6LiMO2（M= Mn、Co、Ni、Al）were investigated. XRD and SEM technologies were used to analyze the phase and morphological characteristics of samples, respectively. The electrochemical properties were studied by gavanostatic charge-discharge and cyclic voltammetry tests. The results show that spherical particles with 8μm diameter were obtained by agglomeration of 300 nm original grains, when Li content was 10% excess. The sample of 0.4Li2MnO3-0.6LiMn0.35Ni0.3Co0.3Al0.05O2 was obtained by calcinating at 850℃ for 8 hours, which had the highest initial discharge capacity 232.6 mAh/g at 0.1C. It maintains 233.7 mAh/g after 15 charge-discharge cycles. The retention rate of discharge capacity was 100%.
KeyWords：Li2MnO3；ball-milling；spray drying；Al doping
目录
1.绪论 1
1.1 引言 1
1.2 锂离子电池简介 1
1.2.1锂离子电池发展状况 1
1.2.2 锂离子电池的结构和工作原理 2
1.2.3 锂离子电池正极材料的结构和电化学性能 3
1.3 锂离子电池的正极材料的研究进展 3
1.3.1Li2MnO3脱嵌锂机理 4
1.3.2Li2MnO3的制备方法 4
1.4 课题的主要内容 5
1.4.1 课题研究的目的和意义 5
1.4.2 课题研究内容 5
1.4.3 实验方案设计 6
2.实验及表征 7
2.1 实验原料 7
2.2 实验仪器 7
2.3 样品的制备 8
2.4 电极材料制备与电池组装 9
2.5 物理性能表征 10
2.5.1 粒度分析 10
2.5.2 X射线衍射分析 11
2.5.3扫描电子显微镜 11
2.6电化学性能测试 11
2.6.1 充放电性能测试 11
2.6.2 循环伏安测试 12
3.结果与讨论 13
3.1 粒度分析 13
3.2配锂量的影响 14
3.2.1不同配锂量对富锂正极材料循环性能的影响 14
3.2.2不同配锂量对富锂正极材料形貌的影响 14
3.3温度的影响 15
3.3.1不同温度对富锂正极材料物相的影响 15
3.3.2不同温度对富锂正极材料充放电性能的影响 16
3.4 Al掺杂量的影响 17
3.4.1不同Al掺杂量对富锂正极材料物相的影响 17
3.4.2不同Al掺杂量对富锂正极材料循环性能的影响 18
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