Abstract
In this study, deep eutectic solvent synthesized by choline chloride (C5H14CINO) and oxalic acid dihydrate (C2H2O4·2H2O) was used to recycling LiFePO4 cathodes for spent lithium-ion batteries. The recycling process was optimized by response surface methodology. When the solid-to-liquid ratio is 0.02 and the reaction was performed at 106 °C for 110 min, the leaching efficiencies of lithium and iron are 95.3% and 85.2%, respectively. The measurement results show that iron is recycled as the form of FeC2O4·2H2O after the UV irradiation and lithium is recycled by chemical precipitation. No mineral acid or high temperature is involved in this work, which has great environmental significance to promote the healthy development of the battery recycling technology.
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The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.
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Acknowledgements
The work was supported by the Central Guidance on Local Science and Technology Development Fund of Henan Province (Z20221343028), Independent Innovation Fund Project of Wuhan University of Technology (2019III123CG), 111 Project (B17034) and Innovative Research Team Development Program of Ministry of Education of China (IRT_17R83). XRD, UV-VIS and FT-IR examinations were assisted by the Center of Material Research and Analysis of Wuhan University of Technology. Thanks to Wuhan GEM Co., Ltd., China for its strong support.
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CW: Methodology, conceptualization, writing—review and editing, supervision, project administration. HY: Formal analysis, investigation, data curation, writing—original draft. CY: Validation, supervision, project administration, funding acquisition. YL: Conceptualization, methodology, resources, investigation, writing- review and editing, supervision, project administration, funding acquisition. LB: Project administration, funding acquisition. SY: Supervision, project administration.
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Wang, C., Yang, H., Yang, C. et al. A novel recycling process of LiFePO4 cathodes for spent lithium-ion batteries by deep eutectic solvents. J Mater Cycles Waste Manag 25, 2077–2086 (2023). https://doi.org/10.1007/s10163-023-01654-3
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DOI: https://doi.org/10.1007/s10163-023-01654-3