铝电解石墨化废阴极炭块制备锂离子电池负极材料

郑志豪; 谢明壮; 于国庆; 吴泽港; 钟晶晶; 王艺; 赵洪亮; 刘风琴

doi:10.1007/s12613-024-2866-z

Volume 31 Issue 11

Nov. 2024

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文章导航 > 矿物冶金与材料学报（英文） > 2024 > 31(11): 2466-2475

Zhihao Zheng, Mingzhuang Xie, Guoqing Yu, Zegang Wu, Jingjing Zhong, Yi Wang, Hongliang Zhao, and Fengqin Liu, Preparation of lithium-ion battery anode materials from graphitized spent carbon cathode derived from aluminum electrolysis, Int. J. Miner. Metall. Mater., 31(2024), No. 11, pp. 2466-2475. https://doi.org/10.1007/s12613-024-2866-z

Cite this article as:

Zhihao Zheng, Mingzhuang Xie, Guoqing Yu, Zegang Wu, Jingjing Zhong, Yi Wang, Hongliang Zhao, and Fengqin Liu, Preparation of lithium-ion battery anode materials from graphitized spent carbon cathode derived from aluminum electrolysis, Int. J. Miner. Metall. Mater., 31(2024), No. 11, pp. 2466-2475. https://doi.org/10.1007/s12613-024-2866-z

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研究论文

铝电解石墨化废阴极炭块制备锂离子电池负极材料

1)
北京科技大学绿色低碳钢铁冶金全国重点实验室, 北京 100083, 中国
2)
北京科技大学冶金与生态工程学院, 北京 100083, 中国

通讯作者:
赵洪亮 E-mail: zhaohl@ustb.edu.cn

刘风琴 E-mail: liufq@ustb.edu.cn

文章亮点

(1) 系统地研究了纯化过程中杂质去除对石墨微观结构的影响规律。

(2) 实现了从危险固废向锂电石墨负极材料的转变并研究了其电化学性能。

(3) 总结并提出了一条绿色高效的湿法工艺路线。

中文摘要

石墨化废阴极炭块(SCC)是铝电解过程中产生的一种危险固体废弃物，针对废阴极炭块资源化利用的难题，本研究提出了浮选–酸浸的工艺对废石墨化阴极炭块进行纯化，并对纯化后的废阴极作为锂离子电池负极材料进行探究。采用单因素实验分别对浮选和酸浸工艺进行优化，当浮选粒径为−200目占90%，矿浆浓度为10%，主轴转速为1600 r/min，充气量0.2 m³/h时，SCC碳含量达93%；随后在浸出浓度5 mol/L、浸出时间100 min、浸出温度85°C以及浸出液固比5:1的条件下，SCC的碳含量可达99.58%。纯化后的废石墨化阴极作负极材料在0.1 C条件下初始容量为348.2 mAh/g，循环100次后可逆容量为347.8 mAh/g，与商用石墨相比，有着更好的可逆性和循环稳定性。因此，SCC经纯化后有望成为潜在的负极材料，该方法也为SCC的资源化回收利用提供了一条可行的途径。

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Research Article

Preparation of lithium-ion battery anode materials from graphitized spent carbon cathode derived from aluminum electrolysis

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Abstract

Abstract

Graphitized spent carbon cathode (SCC) is a hazardous solid waste generated in the aluminum electrolysis process. In this study, a flotation–acid leaching process is proposed for the purification of graphitized SCC, and the use of the purified SCC as an anode material for lithium-ion batteries is explored. The flotation and acid leaching processes were separately optimized through one-way experiments. The maximum SCC carbon content (93wt%) was achieved at a 90% proportion of −200-mesh flotation particle size, a slurry concentration of 10wt%, a rotation speed of 1600 r/min, and an inflatable capacity of 0.2 m³/h (referred to as FSCC). In the subsequent acid leaching process, the SCC carbon content reached 99.58wt% at a leaching concentration of 5 mol/L, a leaching time of 100 min, a leaching temperature of 85°C, and an HCl/FSCC volume ratio of 5:1. The purified graphitized SCC (referred to as FSCC-CL) was utilized as an anode material, and it exhibited an initial capacity of 348.2 mAh/g at 0.1 C and a reversible capacity of 347.8 mAh/g after 100 cycles. Moreover, compared with commercial graphite, FSCC-CL exhibited better reversibility and cycle stability. Thus, purified SCC is an important candidate for anode material, and the flotation–acid leaching purification method is suitable for the resourceful recycling of SCC.
- graphitized spent carbon cathode;
- hazardous solid waste;
- flotation;
- acid leaching;
- lithium-ion batteries

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References

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