标题: Coupling Electrochemical Leaching with Solvent Extraction for Recycling Spent Lithium-Ion Batteries

作者: Zhao, JJ (Zhao, Jingjing); Zhou, FY (Zhou, Fengyin); Wang, HY (Wang, Hongya); Qu, X (Qu, Xin); Wang, DF (Wang, Danfeng); Cai, YQ (Cai, Yuqi); Zheng, ZY (Zheng, Zhiyu); Wang, DH (Wang, Dihua); Yin, HY (Yin, Huayi)

来源出版物: ENVIRONMENTAL SCIENCE & TECHNOLOGY DOI: 10.1021/acs.est.4c06480 Early Access Date: SEP 2024 Published Date: 2024 SEP 10

摘要: We propose coupling electrochemical leaching with solvent extraction to separate and recover Li and Co from spent lithium-ion batteries (LIBs). Electrochemical leaching occurs in the aqueous electrolyte for converting solid LiCoO2 into soluble Li+ and Co2+, in which electrons act as reductants to reduce Co(III) to Co(II). Simultaneously, solvent extraction occurs at the interface of aqueous and organic phases to separate Co2+ and Li+. By capturing and utilizing the protons from P507, leaching yields for both Co and Li exceed similar to 7 times than acid leaching without solvent extraction. The extraction efficiency of Co2+ reaches 86% at 60 degrees C, 3.5 V, while simultaneously retaining the majority of Li+ in the H2SO4 solution. The total leaching amount was improved because the organic phase provides protons to help the leaching of Co2+, and the continuous extraction process of Co(II) maintains the low Co2+ concentration in the aqueous solution. The synergistic interaction between electrochemical leaching and solvent extraction processes significantly reduces the consumption of chemicals, enhances the utilization efficiency of protons, and simplifies the recovery process. The leaching kinetics of Li and Co both conforms well to the residue layer diffusion control model and the activation energy (E-a) values of the leaching for Li and Co are 4.03 and 7.80 kJ/mol, respectively. Lastly, the economic and environmental assessment of this process also demonstrates the advantages of this method in reducing inputs, lowering environmental pollution, and enhancing economic benefits.

作者关键词: recycling; spent lithium-ion battery; electrochemicalleaching; solvent extraction; synergistic effect; kinetics

地址: [Zhao, Jingjing; Zhou, Fengyin; Wang, Hongya; Qu, Xin; Wang, Danfeng; Cai, Yuqi; Zheng, Zhiyu; Wang, Dihua; Yin, Huayi] Wuhan Univ, Sch Resource & Environm Sci, Wuhan 430072, Peoples R China.

[Wang, Dihua; Yin, Huayi] Hubei Int Sci & Technol Cooperat Base Sustainable, Wuhan 430072, Peoples R China.

[Wang, Dihua; Yin, Huayi] Joint Ctr Green Mfg Energy Storage Mat Wuhan Univ, Wuhan 430072, Peoples R China.

通讯作者地址: Yin, HY (通讯作者)，Wuhan Univ, Sch Resource & Environm Sci, Wuhan 430072, Peoples R China.

Yin, HY (通讯作者)，Hubei Int Sci & Technol Cooperat Base Sustainable, Wuhan 430072, Peoples R China.

Yin, HY (通讯作者)，Joint Ctr Green Mfg Energy Storage Mat Wuhan Univ, Wuhan 430072, Peoples R China.

电子邮件地址: yinhuayi@whu.edu.cn

影响因子：10.8