| Summary: | 碩士 === 國立臺灣科技大學 === 化學工程系 === 106 === Lithium-ion batteries (LIBs) have been widely used for energy storage because of their high energy density, lightweight, and durability. The amount of spent LIBs increased rapidly recently. Recovery of metals from spent lithium-ion batteries (LIBs) is essential for sustainable utilization of resources. Acid leaching is commonly used for leaching of metals from spent LIBs. However, it could be time-consuming. Microwave-assisted leaching is studied for leaching of cobalt (Co), lithium (Li), and manganese (Mn) from spent LIBs as a cost-effective, green, and environmentally friendly method.
Effects of parameters such as acid types (HCl, H2SO4, CH3COOH, and ascorbic acid), acid concentration (0.5-1.5 N), solid to liquid ratio (10-40 g/L), and microwave power (100-300 W) were investigated. When at 10 g/L solid to liquid ratio, microwave power of 300 W, and 5 min of reaction time, the leaching efficiency of Co, Li, and Mn were 44.74, 87.92%, and 47.57%, respectively using 0.5 N of HCl. It increased to 80.09% for Co, 102.81% for Li, and 69.80% for Mn as HCl concentration increased to 1.5 M. And the leaching efficiency of Co, Li, and Mn were 113.03, 101.13%, and 111.13%, respectively using 0.5 N of ascorbic acid. It was found that the leaching of Co and Mn were significantly dependent on the reducibility of acid. Ascorbic acid has high reducibility which can leach Co, Li, and Mn effectively. The hydrogen ion concentration and complex formation between metals and acid are also involved in the leaching process. Compared with conventional leaching, microwave-assisted leaching was more efficient and required shorter reaction time. This method offers high potential to be applied for recycling of spent LIBs.
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