Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming, 650093, China; Faculty of Metallurgy and Energy Engineering, National and Local Joint Engineering Laboratory for Lithium-ion Batteries and Materials Preparation Technology, Kunming University of Science and Technology, Kunming, 650093, China.
Faculty of Metallurgy and Energy Engineering, National and Local Joint Engineering Laboratory for Lithium-ion Batteries and Materials Preparation Technology, Kunming University of Science and Technology, Kunming, 650093, China.
J Environ Manage. 2021 Jan 1;277:111426. doi: 10.1016/j.jenvman.2020.111426. Epub 2020 Oct 5.
A novel process for recycling of spent LiCoO cathode materials has been developed. The novel process comprises an ultrasonic enhanced leaching and one-step regeneration of LiCoO materials with spray drying method. The ultrasonic is novelly applied for effectively improving leaching process of spent LiCoO materials in the system of DL-malic acid and HO. The leaching efficiencies of 98.13% for Li and 98.86% for Co were presented under the optimal condition of 1.5 mol/L DL-malic acid with 3 vol% HO, the solid/liquid ratio of 4 g/L, ultrasonic power of 95 W, temperature of 80 °C and leaching time of 25 min. Based on kinetic analysis, the ultrasonic enhanced leaching process is mainly controlled by the diffusion control model. Meanwhile, the product of Co(COO) formed on particles surface of spent LiCoO materials during ultrasonic enhanced leaching process, which is provided from reaction mechanism analysis of scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS). Finally, the regenerated LiCoO materials are regenerated in one step by spray drying from leaching solution, which present good electrochemical performance.
一种新型的废旧钴酸锂正极材料回收工艺已经开发出来。新工艺包括超声强化浸出和一步喷雾干燥法再生 LiCoO 材料。超声技术被创新性地应用于有效改善 DL-苹果酸和 HO 体系中废旧 LiCoO 材料的浸出过程。在最佳条件下，即 1.5 mol/L DL-苹果酸加 3 vol% HO、固液比为 4 g/L、超声功率为 95 W、温度为 80°C、浸出时间为 25 min，Li 和 Co 的浸出率分别达到 98.13%和 98.86%。基于动力学分析，超声强化浸出过程主要受扩散控制模型控制。同时，扫描电子显微镜（SEM）、傅里叶变换红外光谱（FT-IR）和 X 射线光电子能谱（XPS）的反应机理分析表明，超声强化浸出过程中，Co(COO)在废旧 LiCoO 材料颗粒表面形成。最后，浸出液通过喷雾干燥一步再生 LiCoO 材料，表现出良好的电化学性能。
