优化富锂材料亮相分布提高结构稳定性及抑制电压衰减

于杨; 李建玲; 韩桂梅; 杨哲; 钟健健; 康飞宇

doi:10.1007/s12613-021-2362-7

Volume 29 Issue 12

Dec. 2022

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文章导航 > 矿物冶金与材料学报（英文） > 2022 > 29(12): 2201-2211

Yang Yu, Jianling Li, Guimei Han, Zhe Yang, Jianjian Zhong, and Feiyu Kang, Optimize two-phase distribution of lithium-rich materials to stabilize structure and suppress voltage attenuation, Int. J. Miner. Metall. Mater., 29(2022), No. 12, pp. 2201-2211. https://doi.org/10.1007/s12613-021-2362-7

Cite this article as:

Yang Yu, Jianling Li, Guimei Han, Zhe Yang, Jianjian Zhong, and Feiyu Kang, Optimize two-phase distribution of lithium-rich materials to stabilize structure and suppress voltage attenuation, Int. J. Miner. Metall. Mater., 29(2022), No. 12, pp. 2201-2211. https://doi.org/10.1007/s12613-021-2362-7

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研究论文

优化富锂材料亮相分布提高结构稳定性及抑制电压衰减

1)
北京科技大学冶金与生态工程学院, 北京 100083, 中国
2)
中国环境科学研究院, 北京 100083, 中国
3)
清华大学材料学院, 北京 100083, 中国

通讯作者:
李建玲 E-mail: lijianling@ustb.edu.cn

韩桂梅 E-mail: hangui_mei@126.com

文章亮点

(1) 创新性地分布共沉淀可有效控制过渡金属的分布，从而控制本体中的相分布。

(2) 成功实施调相工程，在表面生成尖晶石相，显着抑制电压衰减。

(3) 通过各种表征详细研究了抑制电压衰减的机理。

中文摘要

富锂材料虽然具有超高的比容量，但由于氧的氧化还原不完全可逆，因此会出现电压衰减和结构不稳定的现象。本文首次采用分布共沉淀的方法以通过控制过渡金属元素的分布来实现对两相分布的调控。经过检测发现成功的增加了颗粒内部中LiMO₂（M = Ni、Co、Mn）相的含量以及颗粒表面Li₂MnO₃相的含量，并在表面形成了Li₄Mn₅O₁₂尖晶石相。这使得材料表现出优异的电化学性能：LR（原始）在 1 C 500 圈循环后的放电比容量为 72.7 mAh⋅g⁻¹，而GR（改性样品）的放电比容量仍为 137.5 mAh⋅g⁻¹。在1 C循环220圈后，GR 的放电中压仍然保持在3 V以上。因此，通过调节两相的局部状态可以有效地稳定材料结构和抑制电压衰减。

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Research Article

Optimize two-phase distribution of lithium-rich materials to stabilize structure and suppress voltage attenuation

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Abstract

Abstract

Lithium-rich materials possess the ultra-high specific capacity, but the redox of oxygen is not completely reversible, resulting in voltage attenuation and structural instability. A stepwise co-precipitation method is used for the first time in this paper to achieve the control of the two-phase distribution through controlling the distribution of transition metal elements and realize the modification of particle surface structure without the aid of heterologous ions. The results of characterization tests show that the content of LiMO₂ phase inside the particles and the content of Li₂MnO₃ phase on the surface of the particles are successfully increased, and the surface induced formation of Li₄Mn₅O₁₂ spinel phase or some disorderly ternary. The electrochemical performance of the modified sample is as follows: LR (pristine) shows specific discharge capacity of 72.7 mA·h·g⁻¹ after 500 cycles at 1 C, while GR (modified sample) shows specific discharge capacity of 137.5 mA·h·g⁻¹ at 1 C, and the discharge mid-voltage of GR still remains above 3 V when cycling to 220 cycles at 1 C (mid-voltage of LR remains above 3 V when cycling to 160 cycles at 1 C). Therefore, deliberately regulating the local state of the two phases is a successful way to reinforced the material structure and inhibition the voltage attenuation.
- lithium-rich;
- phase tuning engineering;
- stepwise co-precipitation;
- voltage attenuation

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