Abstract

End-of-life lithium-ion batteries (LIBs) have received unprecedented consideration because of their potential environmental pollution and the value of decisive metal supplies. The dosage of over-stoichiometric amounts of acids, including all kinds of organic or inorganic acids, may result in corrosion of the equipment or production of toxic and harmful gases. Herein, an unconventional acid-free method—salt leaching to extract Ni, Co, Mn, and Li from a spent LiNi_0.5Co_0.2Mn_0.3O₂ cathode material using Fe(II) (reductant reagent) and Fe(III) (precipitation) is proposed. Under the condition with 0.2 mol/L Fe₂(SO₄)₃, 0.36 mol/L FeSO₄, 40 min, and 90 °C, the leaching efficiencies of Ni, Co, Mn, and Li are all higher than 96%. X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM) characterizations are applied for revealing the phase changes in leaching process. This new type of acid-free slat-leaching method provides a new idea for the recycling of spent LIBs containing metals such as nickel, cobalt, and manganese.

Graphical Abstract

中文翻译：

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使用 Fe(II) 和 Fe(III) 溶液从废锂离子电池中无酸浸出镍、钴、锰和锂

摘要

报废锂离子电池 (LIB) 因其潜在的环境污染和决定性金属供应的价值而受到前所未有的关注。过量使用酸，包括各种有机酸或无机酸，可能导致设备腐蚀或产生有毒有害气体。在此，一种非常规的无酸方法——使用 Fe(II)（还原剂）和 Fe(III)（沉淀）从废 LiNi _0.5 Co _0.2 Mn _0.3 O ₂正极材料中提取 Ni、Co、Mn 和 Li ) 建议。在0.2 mol/L Fe ₂ (SO ₄ ) ₃、0.36 mol/L FeSO _{4的条件下}, 40 min, 90 °C, Ni, Co, Mn, Li的浸出率均高于96%。X 射线衍射 (XRD)、傅里叶变换红外光谱 (FTIR) 和扫描电子显微镜 (SEM) 表征用于揭示浸出过程中的相变。这种新型的无酸板条浸出方法为废锂离子电池的回收利用提供了新思路，包括镍、钴、锰等金属。

图形概要