颗粒微观结构对LiNi0.8Co0.1Mn0.1O2正极材料电性能的影响研究

唐泽勋; 叶红齐; 马鑫; 韩凯

doi:10.1007/s12613-021-2296-0

Volume 29 Issue 8

Aug. 2022

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文章导航 > 矿物冶金与材料学报（英文） > 2022 > 29(8): 1618-1626

Zexun Tang, Hongqi Ye, Xin Ma, and Kai Han, Effect of particle micro-structure on the electrochemical properties of LiNi_0.8Co_0.1Mn_0.1O₂ cathode material, Int. J. Miner. Metall. Mater., 29(2022), No. 8, pp. 1618-1626. https://doi.org/10.1007/s12613-021-2296-0

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Zexun Tang, Hongqi Ye, Xin Ma, and Kai Han, Effect of particle micro-structure on the electrochemical properties of LiNi0.8Co0.1Mn0.1O2 cathode material, Int. J. Miner. Metall. Mater., 29(2022), No. 8, pp. 1618-1626. https://doi.org/10.1007/s12613-021-2296-0

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研究论文

颗粒微观结构对LiNi_0.8Co_0.1Mn_0.1O₂正极材料电性能的影响研究

1)
中南大学化学化工学院, 锰资源高效清洁利用湖南省重点实验室, 长沙 410083, 中国
2)
桑顿新能源科技有限公司正极材料研发部, 湘潭 411100, 中国

通讯作者:
马鑫 E-mail: kaihan@csu.edu.cn

韩凯 E-mail: kaihan@csu.edu.cn

文章亮点

(1) 系统地研究了LiNi_0.8Co_0.1Mn_0.1O₂材料二次颗粒与单晶态颗粒的性能差异。

(2) 优化出具有表面低碱度，较高克容量和高温高压循环稳定性的单晶LiNi_0.8Co_0.1Mn_0.1O₂。

(3) 分析了单晶态材料在提高稳定性、降低副反应、抑制循环阻抗上升等方面的作用机理。

中文摘要

锂离子电池正极材料LiNi_0.8Co_0.1Mn_0.1O₂（简称NCM811）能量密度高，有望满足电动汽车长续航里程要求，近年来成为业内关注和研究的焦点。然而，NCM811存在表面碱度高，稳定性差，长循环下颗粒容易碎裂和粉化等问题，阻碍了其大规模应用。本文将三元材料进行单晶化研究，即将二次球颗粒熔融形成单晶颗粒，以期解决三元材料结构和表面稳定性差等问题，并探索在高电压体系使用可行性。实验结果表明，将锂与过渡金属配比设为1.05，在910°C下烧结12 h，可得到形貌较好的单晶NCM811材料，此时材料表面碱度和晶格Ni/Li阳离子混排度均较低，分别为0.288wt%和2.24%。电性能评估结果显示，该材料在3.0–4.3 V下克容量可达191.5mAh/g，同时高温和高电压下循环稳定性得到明显提升，在高温50°C下，3.0–4.4V电压区间内循环100周，容量保持率可达95.1%，而二次颗粒材料仅为88.5%。相比二次颗粒，单晶形态的NCM811材料虽然倍率性能会稍有下降，但结构和表面稳定性更佳，在高电压高能量密度体系具有较好的应用前景。

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Research Article

Effect of particle micro-structure on the electrochemical properties of LiNi_0.8Co_0.1Mn_0.1O₂ cathode material

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Abstract

Abstract

Ni-rich layered material is a kind of high-capacity cathode to meet the requirement of electric vehicles. As for the typical LiNi_0.8Co_0.1Mn_0.1O₂ material, the particle formation is significant for electrochemical properties of the cathode. In this work, the structure, morphology, and electrochemical performance of LiNi_0.8Co_0.1Mn_0.1O₂ secondary particles and single crystals were systematically studied. A lower Ni²⁺/Ni³⁺ molar ratio of 0.66 and a lower residual alkali content of 0.228wt% were achieved on the surface of the single crystals. In addition, the single crystals showed a discharge capacity of 191.6 mAh/g at 0.2 C (~12 mAh/g lower than that of the secondary particles) and enhanced the electrochemical stability, especially when cycled at 50°C and in a wider electrochemical window (between 3.0 and 4.4 V vs. Li⁺/Li). The LiNi_0.8Co_0.1Mn_0.1O₂ secondary particles were suitable for applications requiring high specific capacity, whereas single crystals exhibited better stability, indicating that they are more suitable for use in long life requested devices.
- Ni-rich layered materials;
- single crystal;
- cathode;
- micro-structure;
- lithium-ion battery

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