Green Recovery of Cathode Active Materials from Li-Ion Battery Electrode Scraps Using Propylene Carbonate: A Novel Approach for Direct Recycling
Green Recovery of Cathode Active Materials from Li-Ion Battery Electrode Scraps Using Propylene Carbonate: A Novel Approach for Direct Recycling
复制标题
DOI：
10.1021/acssuschemeng.3c01278
复制
发表时间：
2023-07-11
影响因子：
8.4
通讯作者：
Shin，Hosop
中科院分区：
文献类型：
--
作者：
Bhuyan，Md. Sajibul Alam;Shin，Hosop
从锂离子电池电极废料中回收阴极活性材料是直接回收的关键步骤;然而，由于活性材料，炭黑和粘合剂之间的强键，它带来了挑战。在这项工作中，我们提出了使用碳酸丙烯酯（PC）作为一种绿色溶剂的溶剂为基础的解放/分离过程。与其他绿色溶剂相比，PC具有在相对较低的温度和较短的时间内从电极废料中有效释放活性材料的优点。通过基于PC的工艺获得的回收阴极保留了其形态、结构和电化学特性，证明了所开发的工艺用于直接回收的适用性。此外，该方法通过增强回收的活性材料的电荷转移电阻提供了令人感兴趣的益处。在溶剂释放/分离过程中使用PC提供了一种可行的方法来减轻溶剂型工艺中常见的杂质相关挑战。通过利用PC的增塑剂效应，活性材料上的残留聚偏二氟乙烯物质转化为促进锂离子传导的物质。这种转变导致回收的阴极材料的整体电化学性能的改善。
Retrieving cathode active materials from Li-ion battery electrode scraps is a crucial step in direct recycling; however, it presents challenges due to the strong bonds between the active material, carbon black, and binder. In this work, we propose the use of propylene carbonate (PC) as a green solvent for a solvent-based liberation/separation process. Compared to other green solvents, PC offers the advantage of efficiently liberating active materials from electrode scraps at a relatively low temperature and within a short time. The reclaimed cathode obtained through the PC-based process retains its morphological, structural, and electrochemical characteristics, demonstrating the suitability of the developed process for direct recycling. Additionally, the process provides an intriguing benefit by enhancing the charge-transfer resistance of the reclaimed active material. The use of PC in the solvent liberation/separation process offers a viable approach to mitigate impurity-related challenges commonly encountered in solvent-based processes. By leveraging the plasticizer effect of PC, the residual polyvinylidene fluoride species on the active material are transformed into species that facilitate Li-ion conduction. This transformation leads to an improvement in the overall electrochemical performance of the recovered cathode material.