Strengthening Valuable Metal Recovery from Spent Lithium-Ion Batteries by Environmentally Friendly Reductive Thermal Treatment and Electrochemical Leaching
Strengthening Valuable Metal Recovery from Spent Lithium-Ion Batteries by Environmentally Friendly Reductive Thermal Treatment and Electrochemical Leaching
复制标题
通过环保还原热处理和电化学浸出加强废旧锂离子电池中有价金属的回收
DOI：
10.1021/acssuschemeng.1c00937
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发表时间：
2021-04-21
影响因子：
8.4
通讯作者：
Yang, Yue
中科院分区：
文献类型：
--
作者：
Lei, Shuya;Zhang, Yintao;Yang, Yue
传统的酸浸回收废旧锂离子电池正极材料中有价金属的方法存在着硫酸消耗量大、还原剂用量大等问题。在本研究中，开发了一种新的工艺，通过还原热处理和电化学浸出来加强从废旧锂离子电池中回收有价金属。在R=1600℃，120min的还原热处理条件下，正极材料LiNi1/3Co1/3Mn1/3O2的层状结构由于氧的释放而被还原为Li2CO3、NiO、Co3O4、Mn2O3和MnO2的混合物。层状晶体结构的破坏降低了浸出有价金属的难度。在液固比20 m L/g、硫酸浓度1.5 M、电流密度0.8 A、室温下浸出150 m in的最佳条件下，镍浸出率为90.59%，钴浸出率为90.53%，锰浸出率为66.40%，锂浸出率为100%。在相同的浸出条件下，比较了还原热处理、酸浸和直接电化学浸出废正极材料的工艺，可以获得最高的金属回收率和经济效益。它可以在常温下实施，减少了还原剂和硫酸的使用量，并充分利用了废石墨，从而为从废LIBS中回收有价金属提供了一种更绿色的回收工艺。
The traditional acid leaching method for recycling valuable metals from the cathode material of spent lithium-ion batteries (LIBs) has encountered the problems of high consumption of H2SO4 and reducing agents. In this study, a novel process has been developed to strengthen valuable metal recovery from spent lithium-ion batteries by reductive thermal treatment and electrochemical leaching. With the help of reductive thermal treatment under the conditions of R = 1600 degrees C and 120 min, the layered structure of the cathode material LiNi1/3Co1/3Mn1/3O2 is reduced to a mixture of Li2CO3, NiO, Co3O4, Mn2O3, and MnO2 due to the oxygen releasing from the framework. The destruction of the layered crystal structure reduces the difficulty of leaching valuable metals. 90.59% Ni, 90.53% Co, 66.40% Mn, and 100% Li were leached under the optimal conditions of 20 mL/g liquid-solid ratio, 1.5 M H2SO4, 0.8 A, and 150 min at room temperature. Comparing the processes of reductive thermal treatment with acid leaching and direct electrochemical leaching of spent cathode material under the same leaching conditions, the proposed approach can achieve the highest metal recovery and economic benefits. It can be implemented at room temperature, decreases the application of reducing agent and sulfuric acid, and makes full use of spent graphite, resulting in a greener recycling process for recovering valuable metals from spent LIBs.