Key Laboratory for Ecological Metallurgy of Multimetallic Mineral (Ministry of Education), Northeastern University, Shenyang, 110819, China.
State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang, 110819, China.
Environ Sci Pollut Res Int. 2023 Jan;30(2):4258-4268. doi: 10.1007/s11356-022-22414-0. Epub 2022 Aug 15.
When considering resource shortages and environmental pressures, salvaging valuable metals from the cathode materials of spent lithium-ion batteries (LIBs) is a very promising strategy to realize the green and sustainable development of batteries. The reductive acid leaching of valuable metals from cathode materials using methanol as a reducing agent was studied. The results show that the leaching efficiencies of Co and Li are 99% under optimal leaching conditions. The leaching kinetics of cathode materials in a HSO-methanol system indicate that the leaching of Co and Li is controlled by diffusion, with activation energies of 69.98 and 10.78 kJ/mol, respectively. Detailed analysis of the leaching reaction mechanism indicates that methanol is ultimately transformed into formic acid through a two-step process to further enhance leaching. No side reactions occur during leaching. Methanol can be a sustainable alternative for the reductive acid leaching of valuable metals from spent LIBs due to its high efficiency, application maturity, environmental friendliness, and low cost.
当考虑资源短缺和环境压力时，从废旧锂离子电池（LIB）的阴极材料中回收有价值的金属是实现电池绿色可持续发展的极具前景的策略。本文研究了使用甲醇作为还原剂从阴极材料中还原浸出有价值金属的方法。结果表明，在最佳浸出条件下，Co 和 Li 的浸出率均达到 99%。在 HSO4-甲醇体系中对阴极材料的浸出动力学研究表明，Co 和 Li 的浸出受扩散控制，其活化能分别为 69.98 和 10.78 kJ/mol。对浸出反应机理的详细分析表明，甲醇最终通过两步反应转化为甲酸，以进一步提高浸出率。浸出过程中没有副反应发生。甲醇具有高效、应用成熟、环境友好和低成本等优点，有望替代传统的浸出方法，用于从废旧 LIB 中还原浸出有价值的金属。
