Selective leaching of Li from spent LIBs thermally pretreated by pyrolysis and incineration between 400 and 700 °C for 30, 60, and 90 min followed by water leaching at high temperature and high L/S ratio was examined. During the thermal pretreatment Li₂CO₃ and LiF were leached. Along with Li salts, AlF₃ was also found to be leached with an efficiency not higher than 3.5%. The time of thermal pretreatment did not have a significant effect on Li leaching efficiency. The leaching efficiency of Li was higher with a higher L/S ratio. At a higher leaching temperature (80 °C), the leaching of Li was higher due to an increase in the solubility of present Li salts. The highest Li leaching efficiency of nearly 60% was observed from the sample pyrolyzed at 700 °C for 60 min under the leaching condition L/S ratio of 20:1 mL g⁻¹ at 80 °C for 3 h. Furthermore, the use of an excess of 10% of carbon in a form of graphite during the thermal treatment did not improve the leaching efficiency of Li.

中文翻译：

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电动汽车锂离子电池焚烧和动态热解过程中通过化学转化选择性回收锂的比较研究

通过在 400 到 700°C 之间热解和焚烧 30、60 和 90 分钟，然后在高温和高 L/S 比下进行水浸，研究了从废 LIB 中选择性浸出锂。在热预处理期间，Li ₂ CO ₃和LiF被浸出。与锂盐一起，AlF ₃还发现浸出的效率不高于 3.5%。热预处理时间对锂浸出效率没有显着影响。L/S 比越高，锂的浸出效率越高。在更高的浸出温度（80°C）下，由于现有锂盐的溶解度增加，锂的浸出率更高。在 L/S 比为 20:1 mL g ^-1的浸出条件下，在 700 °C 下热解 60 分钟的样品在 80 °C下热解3 小时，观察到最高的锂浸出效率接近 60% 。此外，在热处理过程中以石墨形式使用超过 10% 的碳并没有提高锂的浸出效率。