利用氢氧化钠作为浸出剂在高温下从废旧 NMC 电池阴极中选择性提取锂

Rohiman Ahmad Zulkipli, Indra Perdana, D. Aprilianto, Tri Rahmawati, Rochmadi
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引用次数: 0

摘要

由于电子和电动汽车行业的发展,对锂离子电池(LIB)的需求正在迅速增长。尽管锂离子电池可以充电,但其存储容量会逐渐减小,最终会被浪费掉。为了减少对环境的影响并利用废弃物中的贵重金属,有必要对废旧 LIB 进行回收。实验结果表明,在 473.15 K 和 4 M NaOH 的最佳浸出条件下,可回收 56.53% 的锂,选择性接近 100%。计算结果表明,锂浸出过程的活化能为 2.1990×104 J/mol,反应为内热反应,标准条件(298.15 K)下的焓和熵分别为 4.8936×105 J/mol 和 1.4421×103 J/mol/K。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Selective Extraction of Lithium from Spent NMC Battery Cathodes Using Sodium Hydroxide as a Leaching Agent at Elevated Temperatures
The demand for lithium-ion batteries (LIBs) is rapidly increasing due to the growth of the electronics and electric vehicle industries. Even though the batteries are rechargeable, their storage capacity decreases, and they eventually end up being wasted. Recycling the spent LIBs is necessary to reduce the environmental impact and utilize the precious metals contained in the waste The present work focuses on the selective recovery of lithium from the cathodes of spent NMC batteries through the hydrometallurgical process using a sodium hydroxide solution. The leaching process was carried out in 2 M and 4 M NaOH concentrations for 120 minutes at high pressure and at temperatures of 398.15 K, 423.15 K, 448.15 K, and 473.15 K. Experimental results showed that 56.53% of lithium could be recovered with nearly 100% selectivity under the optimum leaching conditions of 473.15 K and 4 M NaOH. The release of lithium ions was due to a combination of sodium adsorption, ion exchange, and impregnation mechanisms. Calculation results showed that the activation energy of the lithium leaching process was 2.1990×104 J/mol, the reaction was endothermic with enthalpy and entropy at standard conditions (298.15 K) of 4.8936×105 J/mol and 1.4421×103 J/mol/K, respectively. The present work also suggested that total lithium recovery can be increased through leaching processes.
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