锂离子电池大比容量LiNi0.8Co0.1Mn0.1O2正极材料的合成和性能研究

摘要利用快速共沉淀法制备出前驱体Ni0.8Co0.1Mn0.1(OH)2，再将制备好的前驱体与氢氧化锂在氧气的氛围下进行高温煅烧，由此得到LiNi0.8Co0.1Mn0.1O2的粉末，将其与石墨烯和PVDF混合后涂于铝片上制成锂离子电池正极材料。设前驱体的反应时间分别为2min，5min，1h，分别对不同反应时间的前驱体Ni0.8Co0.1Mn0.1(OH)2和LiNi0.8Co0.1Mn0.1O2粉末进行XRD和SEM分析，并对三组锂离子电池进行充放电性能分析。可以得出结果：随着反应时间的减小，晶体层状结构更好，阳离子混排低；颗粒粒径越小，分散性能越好，其放电放电容量分别为120mAh/g，140 mAh/g和149 mAh/g。其容量保持率分别为：50.83%，52.14%和67.11%。说明前驱体反应的速度越快，所制成的锂离子电池结构越均匀细小，利于锂离子的传输，电化性能越好。68053

毕业论文关键词：锂离子电池，正极材料，Ni0.8Co0.1Mn0.1(OH)2，快速共沉淀法

毕业设计说明书（论文）外文摘要

Title Study on the Synthesis and Properties of layered LiNi0.8Co0.1Mn0.1O2 cathode materialfor lithium-ion battery

Abstract

Synthesized the precursor Ni0.8Co0.1Mn0.1(OH)2 via fast co-precipitation method and then mixing the precursor with the stoichiometric amount of the lithium hydroxide in a high temperature in oxygen atmosphere. Then we obtained powder of LiNi0.8Co0.1Mn0.1O2 cathode material .The cathode material was consisted of 80 wt.% active material, 10 wt.% acetylene black and 10 wt.% PVDF binder. The precipitation reaction time was 2min, 5min, 1h, Respectively, in the whole experiments. we had XRD and SEM analysis of precursor Ni0.8Co0.1Mn0.1(OH)2 and LiNi0.8Co0.1Mn0.1O2 powder. It can be seen from the morphology and XRD results that the precursor synthesized for 1 min has nano-crystalline structure with low crystallinity. XRD results found that nano-crystalline phase and low crystallinity could benefit the decomposition of the precursor and achieve its uniform mixing with lithium source, and further attribute to highly ordered layered LiNi0.8Co0.1Mn0.1O2 with low cation mixing degree, Electrochemical studies showed that the LiNi0.8Co0.1Mn0.1O2 synthesized for 1 min, 5 min, 1 h exhibits the capacity of 149mAh/ g,140mAh/g,125mAh/g, respectively, at a current density of18 mA/ g and the capacity retention after 30 cycles at 0.1C is 67.11%, 52.14%, 48.80%.It is concluded that this fast co-precipitation method is a simple, effective and excellent method to synthesize the layered cathode material.

Keywords Lithium ion battery，Cathode material，Ni0.8Co0.1Mn0.1(OH)2

1引言 1

1.1 本课题研究内容 1

1.2 锂离子电池的工作原理 2

1.3 锂离子电池正极材料 2

1.4 镍钴锰酸锂作为正极材料的分析 4

1.5本课题的重点工作 7

2 实验 8

2．1 实验仪器以及药品 8

2.2LINI0.8CO0.1MN0.1O2正极材料¬的制备 9

2.3 电池的组装 9

3 结果与讨论 13

3.1 XRD衍射分析 13

3.2 SEM形貌分析 16

3.3 电化学性能分析 20

结论 23

致谢 24

1引言锂离子电池大比容量LiNi0.8Co0.1Mn0.1O2正极材料的合成和性能研究:http://www.youerw.com/cailiao/lunwen_76465.html