标题: Efficient and sustainable recycling of spent lithium-ion batteries in deep eutectic solvents enhanced by non-solvating diluent

作者: Yang, HQ (Yang, Hangqi); Li, SZ (Li, Shizhen); Han, ZY (Han, Zhaoyang); Chen, ZJ (Chen, Zejun); Tong, JS (Tong, Jiasheng); Liu, JM (Liu, Juemiao); Peng, C (Peng, Chuang)

来源出版物: CHEMICAL ENGINEERING JOURNAL  卷: 507  文献号: 160702  DOI: 10.1016/j.cej.2025.160702  Published Date: 2025 MAR 1  

摘要: Deep eutectic solvents (DESs) have been proposed as a green alternative to traditional acid leaching in recovery of cathode materials for lithium-ion batteries (LIB). However, the high viscosity of DESs leads to slow mass transfer and low solid-liquid separation efficiency, hindering both the leaching rate and recycling efficacy. In this paper, the viscosity and physicochemical properties of DES are regulated by introducing a non-solvating diluent, i.e., propylene carbonate (PC). The modified DES inherits the solvation structure of the original DES with highly concentrated 1-n-Butyl-3-methylimidazolium-chloride ([Bmim]+-Cl-) - Oxalic acid (OA) clusters distributed in the non-solvating PC diluent. This spatial isolation weakens the electrostatic attractions of nearby clusters/ions, leading to decreased viscosity (24.5 mPa & sdot;s) and higher Cl- diffusion coefficient. As a result, DES with PC diluent exhibits markedly improved leaching rate, kinetics and longer cycle life (Co and Mn leaching efficiency above 92 % after 20 cycles). The leaching-precipitating process directly yields the precursor required for cathode fabrication, resulting in a regenerated cathode that demonstrates stable electrochemical cycling performance.

作者关键词: Spent lithium-ion battery; Deep eutectic solvent; Closed-loop recycling; Diluent; Sustainability

KeyWords Plus: VALUABLE METALS; RECOVERY; CATHODE

地址: [Yang, Hangqi; Li, Shizhen; Chen, Zejun; Tong, Jiasheng; Liu, Juemiao; Peng, Chuang] Wuhan Univ, Sch Resource & Environm Sci, 299 Bayi Rd, Wuhan 430072, Peoples R China.

[Han, Zhaoyang] Zhongyuan Inst Sci & Technol, Sch Electromech Engn, Xuchang 461000, Peoples R China.

通讯作者地址: Peng, C (通讯作者)，Wuhan Univ, Sch Resource & Environm Sci, 299 Bayi Rd, Wuhan 430072, Peoples R China.

电子邮件地址: chuang.peng@whu.edu.cn

影响因子：13.4