Abstract The traditional process of separating valuable metals from spent lithium ion battery (LIB) leaching solutions in which Cu, Ni, Co and Li coexist is cumbersome and costly. LIX984 is commonly used to extract copper from acidic environments. In this work, we develop a novel process using LIX984 as extractant to remove the Cu from the high pH ammonia leaching solution of spent LIB batteries. Then, Li, Ni, and Co is recovered from the aqueous phase to regenerate the LiNi0.5Co0.5O2 cathode materials using a co-precipitation method. Up to 97.85% of Cu and 2.89% of Ni are extracted by LIX984, while almost all the Li and Co remained in the liquid phase under the following optimum conditions: organic/aqueous phase ratio of 1, 15% LIX984, and 25 °C reaction for 10 min. A H2SO4 solution of 1.5 M or higher could completely strip the extracted Cu from the organic phase. The regenerated cathode material LiNi0.5Co0.5O2 appeared as spherical particles with no impurities and demonstrated excellent electrochemical performance. The discharge specific capacity remained at 145.8 mAh·g−1 after 100 cycles. Therefore, this process may be a potential alternative technology to simplifying the spent LIB recycling process.

中文翻译：

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从废锂离子电池氨浸液中提取铜共沉淀再生LiNi0.5Co0.5O2

摘要 从废旧锂离子电池 (LIB) 浸出液中分离贵金属的传统工艺繁琐且成本高昂。LIX984 通常用于从酸性环境中提取铜。在这项工作中，我们开发了一种使用 LIX984 作为萃取剂从废锂电池的高 pH 氨浸出溶液中去除铜的新工艺。然后，从水相中回收 Li、Ni 和 Co，使用共沉淀法再生 LiNi0.5Co0.5O2 正极材料。高达 97.85% 的 Cu 和 2.89% 的 Ni 被 LIX984 萃取，而在以下最佳条件下，几乎所有的 Li 和 Co 都保留在液相中：有机/水相比为 1、15% LIX984 和 25 °C反应10分钟。1 的 H2SO4 溶液。5 M 或更高可以从有机相中完全剥离提取的铜。再生正极材料 LiNi0.5Co0.5O2 呈球形颗粒，不含杂质，表现出优异的电化学性能。100次循环后放电比容量保持在145.8 mAh·g-1。因此，该过程可能是简化废锂离子电池回收过程的潜在替代技术。