电解质
铝酸盐
电池(电)
铝
离子
电导率
化学工程
化学
粘度
离子电导率
无机化学
材料科学
冶金
热力学
复合材料
有机化学
电极
物理化学
功率(物理)
物理
水泥
工程类
作者
Hao Cheng,Zhifan Hua,Yuan Zhu,Tao Wang,Zheng Li,Yao Lü,Zhongliang Tian,Wenyi Lu
摘要
Al-air batteries can serve as a bridge for high-quality cyclic utilization of aluminum resources. However, limited insights into the spent electrolyte are challenging to accurately adjust the recovery process to obtain premium Al-containing products. Herein, the properties and composition of the spent electrolyte were explored through experiments and theoretical calculations. The results demonstrate that the viscosity of the spent electrolyte increased with the rise in discharge current density, time and temperature under highly alkaline conditions, while the ionic conductivity and causticity obviously decreased. Al(OH)4- was the prime and balanced aluminate species when the battery was discharged at 25 °C and coexisted with a bit of [Al2O(OH)6]2-, [Al2O2(OH)6]4- and Al(OH)63- ions. Especially, the characteristics of the spent electrolyte were mainly dominated by the discharge time and temperature when the current density was continuously increased. There was only Al(OH)4- in the electrolyte at a higher discharge temperature. The DFT results also reveal that the polynuclear aluminate ions were produced by the interaction between the mononuclear aluminate ion Al(OH)4- and OH-. This work manifests a profound insight into the spent electrolyte from Al-air batteries for the efficient recycling of aluminum resources.
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