College of Chemical and Biological Engineering, Shandong University of Science and Technology, Qingdao, Shandong, 266590, China; College of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao, Shandong, 266590, China.
College of Chemical and Biological Engineering, Shandong University of Science and Technology, Qingdao, Shandong, 266590, China.
J Environ Manage. 2024 May;358:120818. doi: 10.1016/j.jenvman.2024.120818. Epub 2024 Apr 10.
Hydrometallurgy is a primary method for recovering cathode electrode materials from spent lithium-ion batteries (LIBs). Most of the current research materials are pure cathode electrode materials obtained through manual disassembly. However, the spent LIBs are typically broken as a whole during the actual industrial recycling which makes the electrode materials combined with the collector fluid. Therefore, the competitive leaching between metal collector fluid and electrode material was examined. The pyrolysis characteristics of the electrode materials were analyzed to determine the pyrolysis temperature. The electrode sheet was pyrolyzed and then crushed for competitive leaching. The effect of pyrolysis was analyzed by XPS. The competitive leaching behavior was studied based on leaching agent concentration, leaching time and leaching temperature. The composition and morphology of the residue were determined to prove the competitive leaching results by XRD-SEM. TG results showed that 500 °C was the suitable pyrolysis temperature. XPS analysis demonstrated that pyrolysis can completely remove PVDF. Li and Co were preferentially leached during the competitive leaching while the leaching rates were 90.10% and 93.40% with 50 min leaching at 70 °C. The Al and Cu had weak competitive leachability and the leaching rate was 29.10% and 0.00%. XRD-SEM analysis showed that Li and Co can be fully leached with residual Al and Cu remaining. The results showed that the mixed leaching of electrode materials is feasible based on its excellent selective leaching properties.
湿法冶金是从废旧锂离子电池（LIB）中回收阴极电极材料的主要方法。目前大多数研究材料都是通过手动拆卸获得的纯阴极电极材料。然而，在实际的工业回收中，废旧 LIB 通常是整体破碎的，这使得电极材料与集流体结合在一起。因此，考察了金属集流体和电极材料之间的竞争浸出。分析了电极材料的热解特性，以确定热解温度。对电极片进行热解，然后进行破碎进行竞争浸出。通过 XPS 分析热解效果。研究了浸出剂浓度、浸出时间和浸出温度对竞争浸出行为的影响。通过 XRD-SEM 确定残渣的组成和形貌，以证明竞争浸出结果。TG 结果表明，500°C 是合适的热解温度。XPS 分析表明，热解可以完全去除 PVDF。在竞争浸出过程中，Li 和 Co 优先浸出，在 70°C 下浸出 50min 后，浸出率分别为 90.10%和 93.40%。Al 和 Cu 的竞争浸出能力较弱，浸出率分别为 29.10%和 0.00%。XRD-SEM 分析表明，Li 和 Co 可以完全浸出，残余的 Al 和 Cu 仍存在。结果表明，基于其优异的选择性浸出性能，混合浸出电极材料是可行的。
