Luo Yi, Ou Leming, Yin Chengzhe
School of Minerals Processing and Bioengineering, Central South University, China.
School of Minerals Processing and Bioengineering, Central South University, China.
Waste Manag. 2023 Jun 1;164:1-8. doi: 10.1016/j.wasman.2023.03.031. Epub 2023 Apr 4.
As the demand for lithium-ion batteries rises, the growing quantity of waste produced from lithium-ion battery electrode materials becomes an issue of concern. We propose a novel approach for effectively extracting precious metals from cathode materials that address the problem of secondary pollution and high energy consumption that arise from the conventional wet recovery process. The method employs a natural deep eutectic solvent (NDES) composed of betaine hydrochloride (BeCl) and citric acid (CA). The leaching rates of manganese (Mn), nickel (Ni), lithium (Li), and cobalt (Co) in cathode materials may reach 99.2 %, 99.1 %, 99.8 %, and 98.8 %, respectively, due to the synergy of strong coordination ability (Cl) and reduction (CA) in NDES. This work avoids the use of hazardous chemicals while achieving total leaching in a short period (30 min) at a low temperature (80 °C), achieving an efficient and energy-saving aim. It reveals that NDES has a high potential for recovering precious metals from cathode materials and offers a viable, environmentally friendly method of recycling used lithium-ion batteries (LIBs).
随着锂离子电池需求的增加，锂离子电池电极材料产生的废弃物数量不断增长，这成为一个备受关注的问题。我们提出了一种从阴极材料中有效提取贵金属的新方法，该方法解决了传统湿法回收过程中出现的二次污染和高能耗问题。该方法采用由盐酸甜菜碱（BeCl）和柠檬酸（CA）组成的天然低共熔溶剂（NDES）。由于NDES中强配位能力（Cl）和还原能力（CA）的协同作用，阴极材料中锰（Mn）、镍（Ni）、锂（Li）和钴（Co）的浸出率分别可达99.2%、99.1%、99.8%和98.8%。这项工作避免了使用危险化学品，同时在低温（80°C）下短时间（30分钟）内实现了完全浸出，达到了高效节能的目的。研究表明，NDES在从阴极材料中回收贵金属方面具有很高的潜力，并为回收废旧锂离子电池（LIB）提供了一种可行的、环保的方法。
