Leaching performance of Al-bearing spent LiFePO4 cathode powder in H2SO4 aqueous solution
Leaching performance of Al-bearing spent LiFePO4 cathode powder in H2SO4 aqueous solution
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DOI：
10.1016/s1003-6326(21)65541-3
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发表时间：
2021-03-22
影响因子：
4.5
通讯作者：
Weigand, Jan J.
中科院分区：
文献类型：
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作者：
Lou, Wen-bo;Zhang, Yang;Weigand, Jan J.
系统研究了含铝废磷酸铁锂正极粉中LiFePO4（LFP）和铝的浸出性能和浸出动力学。考察了温度（273~368 K）、搅拌速度（200~950 r/min）、反应时间（0~240 min）、酸料比（0.1:1~1:1 mL/g）、液固比（3:1~9:1 mL/g）对浸出过程的影响。结果表明，反应物浓度和温度对Al的浸出影响较大。在最佳条件下，LFP和Al的浸出效率分别为91.53%和15.98%。动力学研究表明，LFP的浸出受混合表面反应和扩散的动力学控制，活化能为22.990 kJ/mol；而Al的浸出仅受表面化学反应控制，活化能为46.581 kJ/mol。较低的浸出温度可以有效抑制废磷酸铁锂正极材料酸浸过程中Al的溶解。
The leaching performance and leaching kinetics of LiFePO4 (LFP) and Al in Al-bearing spent LFP cathode powder were systematically studied. The effects of temperature (273-368 K), stirring speed (200-950 r/min), reaction time (0-240 min), acid-to-material ratio (0.1:1-1:1 mL/g) and liquid-to-solid ratio (3:1-9:1 mL/g) on the leaching process were investigated. The results show that the concentration of reactants and the temperature have a greater impact on the leaching of Al. Under the optimal conditions, leaching efficiencies of LFP and Al are 91.53% and 15.98%, respectively. The kinetic study shows that the leaching of LFP is kinetically controlled by mixed surface reaction and diffusion, with an activation energy of 22.990 kJ/mol; whereas the leaching of Al is only controlled by surface chemical reaction, with an activation energy of 46.581 kJ/mol. A low leaching temperature can effectively suppress the dissolving of Al during the acid leaching of the spent LFP cathode material.