In this study, the recovery of manganese, nickel, cobalt and lithium of electroactive components from spent lithium-ion batteries is described in detail. Experiments were performed in the presence of formic acid as leachant. Temperature, time, acid concentration and solid/liquid ratio were varied. Manganese, nickel and lithium were leached in high yields (> 99 wt.%) at ~ 80 °C for 3 h using 10 mol L⁻¹ formic acid. This acid played the dual role of leachant and reductant for nickel and manganese. However, cobalt was only half leached under these conditions. The insoluble cobalt was rapidly dissolved after adding H₂O₂ to the leachant. Leached manganese, cobalt and nickel, in this order, were extracted from the leachates with di-2-ethylhexylphosphoric acid (D2EHPA) (25 °C, A/O = 1 v/v) after adjusting pH of the leachate using lithium carbonate. Stripping was run using 1 mol L⁻¹ H₂SO₄. Lithium (99.5 wt.%) was recovered as formate, a high-value added byproduct, by careful evaporation of the aqueous final solution, thus reducing generation of final wastes.

在这项研究中，详细描述了从废锂离子电池中回收电活性成分的锰、镍、钴和锂。实验是在甲酸作为浸出剂存在下进行的。温度、时间、酸浓度和固/液比是变化的。锰、镍和锂使用 10 mol L ^-1甲酸在 ~ 80 °C 下以高产率 (> 99 wt.%) 浸出 3 小时。这种酸对镍和锰起到浸出剂和还原剂的双重作用。然而，在这些条件下，钴仅浸出一半。不溶性钴加入H ₂ O ₂后迅速溶解到浸出液。在使用碳酸锂调节浸出液的 pH 值后，用二-2-乙基己基磷酸（D2EHPA）（25°C，A/O = 1 v/v）从浸出液中依次提取浸出液中的锰、钴和镍。使用1 mol L ^-1 H ₂ SO _{4 进行}汽提。锂 (99.5 wt.%) 以甲酸盐的形式回收，甲酸盐是一种高附加值的副产品，通过仔细蒸发最终水溶液，从而减少最终废物的产生。