Recycling critical metals from spent Li-ion batteries (LIBs) is important for the overall sustainability of future batteries. This study reports an improved sulfation roasting technology to efficiently recycle Li and Co from spent LiCoO₂ LIBs using potassium pyrosulfate as sulfurizing reagent. By sulfation roasting, LiCoO₂ was converted into water-soluble lithium potassium sulfate and water-insoluble cobalt oxide. Under optimal conditions, 98.51% Li was leached in water, with a selectivity of 99.86%. More importantly, sulfur can be recirculated thoroughly, and the sulfur atomic efficiency can be significantly enhanced by controlling the amount of potassium pyrosulfate. Li ions from the water leaching process were recovered by chemical precipitation. Furthermore, application of this technology to other spent LIBs, such as LiMn₂O₄ and LiNi_0.5Co_0.2Mn_0.3O₂, verified its effectiveness for selective recovery Li. These findings can provide some inspiration for high efficiency and environmentally friendly recovery metal from spent LIBs.

从废旧锂离子电池 (LIB) 中回收关键金属对于未来电池的整体可持续性非常重要。本研究报告了一种改进的硫酸化焙烧技术，以使用焦硫酸钾作为硫化试剂，有效地从废 LiCoO ₂ LIB 中回收锂和钴。通过硫酸盐化焙烧，LiCoO ₂转化为水溶性的硫酸锂钾和不溶于水的氧化钴。在最佳条件下，98.51%的锂在水中浸出，选择性为99.86%。更重要的是，硫可以彻底再循环，通过控制焦硫酸钾的用量，可以显着提高硫原子效率。通过化学沉淀法回收水浸出过程中的锂离子。此外，将该技术应用于其他废锂离子电池，如 LiMn ₂ O ₄和 LiNi _0.5 Co _0.2 Mn _0.3 O ₂，验证了其选择性回收Li的有效性。这些发现可以为从废锂离子电池中高效、环保地回收金属提供一些启示。