摘 要

本文研究富镍系的镍钴锰酸锂三元材料，通过静电纺丝法按相应化学计量比制得前驱体，经过预烧、烧结等工艺流程制备锂离子电池三元材料LiNi_0.8Co_0.1Mn_0.1O₂，以XRD为主要表征手段，辅以TGA,SEM等表征方法，利用Jade的精修功能，通过比较模型的理论数据和实验所得实际数据的差别，研究NCM811正极材料的阳离子混排程度。

热重分析得出前驱体在260℃-390℃范围内有断崖式减重。测得三元正极材料的电导率σ≈2.8377S/m，优异于磷酸铁锂等正极材料（未掺杂）的电导率。通过XRD与SEM的分析，煅烧对材料晶相的单一性与结晶性以及材料的层状结构有显著改善作用，使得材料颗粒分布更加均匀，减少了团聚现象。

最后经过jade精修得到r=4.8%, R=1.617gt;1.2,因而该样品阳离子混排程度较弱，在可以接受范围内。

关键字：锂电池 阳离子混排 Jade精修

Utilizing the refinement function of Jade to analyze the cation mixing in ternary material of lithium battery

ABSTRACT

The LiNi_0.8Co_0.1Mn_0.1O₂ ternary material of nickel-rich system is studied in this paper. The precursor is compounded by the method of electrospinning according to the stoichiometric ratio and then prepared by the technological process of presintering and sintering to get the ternary material of lithium battery LiNi_0.8Co_0.1Mn_0.1O₂. XRD is taken as the main method to characterize the material, which is supplemented by the TGA, SEM, etc. Taking advantage of the refinement function of Jade, the level of cation mixing in NCM811 anode material has been evaluated through comparing the difference between theoretical data of the model with the actual one of the experiment.

Through TGA, it is shown to us that the precursor loses weight greatly in the range of 260℃ to 390℃. the conductivity of the ternary material has been attained as 2.8399S/m, which is obviously better than the one of LFP material. Analyzed by the XRD and SEM, the unicity and crystallinity of the crystalline phase as well as the layer structure of the material are improved by the means of sintering, which attributes to the uniformity of the particle distribution and reduces the phenomenon of agglomeration.

Eventually, it is calculated by the refinement of Jade that r=4.8% and R=1.617gt;1.2 so that the level of cation mixing is really low, as is acceptable.

Keywords: Lithium battery; ; Cation mixing; Jade refinement

目录

摘要 2

ABSTRACT 3

第一章 绪论 1

1.1背景意义 1

1.2 NCM三元材料研究进展 2

1.2.1 NCM三元材料组成，结构、性能研究 2

1.2.1制备方法与比较 3

1.3研究内容与方法 6

第二章 实验原料与实验方法 7

2.1 实验药品及仪器 7

2.2制备方法LiNi_0.8Co_0.1Mn_0.1O₂ 8

2.2.1静电纺丝法制备NCM811前驱体 8

2.3 NCM811材料物化性质的表征方法 8

2.3.1热重分析 8

2.3.2 XRD分析 9

2.3.3 扫描电子显微镜测试 10

2.3.4. 电导率的测定 11

第三章 LiNi_0.8Co_0.1Mn_0.1O₂正极材料性能研究 12

3.1 热重分析 12

3.2 XRD表征 13

3.2.1预烧及烧结材料XRD表征 13

3.3 SEM表征 14

3.4电导率分析 14

第四章 Jade精修分析NCM811正极材料阳离子混排 17

4.1 jade精修步骤 17

4.2 Jade精修结果 18

结论 19

参考文献 20

致谢 23

第一章 绪论

1.1背景意义

化石能源被过度开采与使用，造成了环境污染，因而为了绿色可持续发展，人类大力发展清洁能源，而由于便携式设备以及电动交通工具的普及，能量的储存成为了其中一个关键的方面。

人们为了存储电能，发明了许多储能设备，而从铅酸电池到锌镍电池等二次电池，再到现在的锂电池，电化学储能在满足人们的要求下迅速地发展。^[1]

锂离子电池具有高能量密度，高充电效率等优点，是较为理想的储能元件，使得便携式电子设备成为可能。其主要组成部分包括：正、负电极，电解液以及隔膜。其主要工作原理如图1所示。^[3]

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