The regeneration of cathode materials would be the highest value-added direction in lithium-ion battery (LIB) recycling research. Li[Ni_xMn_yCo_z]O₂ (NMC) is regenerated from actual industrial scale LIB leachate and purified leachate to investigate the precipitation behavior of impurities, which include potentially toxic elements, such as F, Cl, and S. Regenerated precursors from the actual leachate, purified precursors, and a control sample are synthesized using the hydroxide co-precipitation method. Additionally, simulated precursors from simulated leachate are prepared in order to separate the effects of nonmetallic elements from the effects of metallic elements. The structure and electrochemical properties of the regenerated precursors and the corresponding cathode materials are examined. We first detect the presence of a significant amount of nonmetal elements, such as F as well as well-known metal elements, which include Al, Cu, and Fe, in the regenerated NMC. The concept of yield of precipitation (YOP) is introduced to assess the precipitation behavior of each element during the co-precipitation of the precursors. According to the concentration and YOP in the leachate and the precursors, six metal and three nonmetal elements are categorized. This categorization of impurity elements will certainly provide the LIB recycling industry with a valuable quality control guide.

正极材料的再生将是锂离子电池（LIB）回收研究中最高附加值的方向。Li[Ni _x Mn _y Co _z ]O ₂(NMC) 从实际工业规模的 LIB 浸出液和纯化的浸出液中再生，以研究杂质的沉淀行为，其中包括潜在的有毒元素，如 F、Cl 和 S。从实际浸出液、纯化的前体和对照中再生的前体样品采用氢氧化物共沉淀法合成。此外，从模拟浸出液中制备模拟前体，以将非金属元素的影响与金属元素的影响分开。检查了再生前体和相应阴极材料的结构和电化学性能。我们首先在再生的 NMC 中检测到大量非金属元素的存在，例如 F 以及众所周知的金属元素，包括 Al、Cu 和 Fe。引入了沉淀产率 (YOP) 的概念来评估每种元素在前体共沉淀过程中的沉淀行为。根据渗滤液和前驱体中的浓度和YOP，分为六种金属元素和三种非金属元素。杂质元素的这种分类肯定会为锂离子电池回收行业提供有价值的质量控制指南。