Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, Nanchang Hangkong University, Nanchang 330063, PR China.
Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, Nanchang Hangkong University, Nanchang 330063, PR China.
Waste Manag. 2023 Jun 15;165:19-26. doi: 10.1016/j.wasman.2023.04.020. Epub 2023 Apr 18.
The slow rate of organic acid leaching is the main factor hindering the ecological recycling of spent lithium-ion battery (LIB) cathode materials. Here, a mixed green reagent system of ascorbic acid and acetic acid is proposed to leach valuable metal ions from the spent LIBs cathode materials rapidly. In 10 min, 94.93% Li, 95.09% Ni, 97.62% Co, and 96.98% Mn were leached, according to the optimization results. Kinetic studies and material characterization technologies like XRD, SEM, XPS, UV-vis, and FTIR show that the "diffusion" and "stratification" effects of acetic acid contribute to the dual-function leaching agent ascorbic acid quickly extract metal ions from spent LiNiCoMnO (NCM532) materials at a mild temperature. In addition, the density-functional theory (DFT) calculations of spent NCM532 structural surfaces and leaching agents show that the fast leaching of valuable metal ions is due to the synergy between ascorbic acid and acetic acid. These results provided an approachable thinking for developing advanced and environmentally friendly strategies for recycling spent LIB cathode materials.
有机酸浸出速度缓慢是阻碍废旧锂离子电池（LIB）阴极材料生态循环的主要因素。在此，提出了一种抗坏血酸和乙酸的混合绿色试剂体系，可快速浸出废旧 LIB 阴极材料中的有价金属离子。根据优化结果，在 10 分钟内，浸出了 94.93%的 Li、95.09%的 Ni、97.62%的 Co 和 96.98%的 Mn。动力学研究和 XRD、SEM、XPS、UV-vis 和 FTIR 等材料表征技术表明，乙酸的“扩散”和“分层”效应有助于作为双功能浸出剂的抗坏血酸在温和的温度下从废旧 LiNiCoMnO（NCM532）材料中快速提取金属离子。此外，对废旧 NCM532 结构表面和浸出剂的密度泛函理论（DFT）计算表明，有价金属离子的快速浸出是由于抗坏血酸和乙酸的协同作用。这些结果为开发先进的、环保的废旧 LIB 阴极材料回收策略提供了一种可行的思路。
