Cost-efficient closed-loop recovery and regeneration of LiFePO4 cathodes via a sodium persulfate-assisted route.
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| Title: | Cost-efficient closed-loop recovery and regeneration of LiFePO4 cathodes via a sodium persulfate-assisted route. |
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| Authors: | Dong, Yizhou1 (AUTHOR), Zhao, Tianshuo1 (AUTHOR), Zhang, Xinlong1 (AUTHOR), Qin, Yonghong1 (AUTHOR), Cheng, Ruiqi1,2 (AUTHOR) ruiqi.cheng@polyu.edu.hk, Fu, Chaopeng1 (AUTHOR) chengchaopengfu@sjtu.edu.cn |
| Source: | Colloids & Surfaces A: Physicochemical & Engineering Aspects. Oct2026, Vol. 747, pN.PAG-N.PAG. 1p. |
| Subjects: | Waste recycling, Persulfates, Leaching, Economic efficiency, Electrochemical experiments |
| Abstract: | The sustainable recycling of spent LiFePO 4 (LFP) cathodes is hindered by the trade-off between efficient element separation and cost-effective closed-loop regeneration. Herein, we present an integrated approach combining the optimized acid leaching with sodium persulfate (Na 2 S 2 O 8)-assisted oxidative precipitation, aiming to overcome this limitation. An orthogonal experimental design establishes the optimal leaching conditions (The spent LFP:H 3 PO 4 :H 2 SO 4 =1:0.62:0.57, 60 °C, liquid/solid ratio of 6:1), achieving high recovery efficiencies of 98.97% for Li and 99.23% for Fe. Remarkably, this strategically optimized integrated process reduces processing costs to only 60% of conventional pyrometallurgical routes and 88% of typical hydrometallurgical routes, while the regenerated LFP exhibits high crystallinity, uniform morphology, and a well-recovered olivine structure. When assembled in Li-ion batteries, R-LFP delivers a discharge capacity of 139.2 mAh g−1 at 1 C and retains 95.2% of its capacity after 300 cycles at 5 C, outperforming spent LFP and rivaling the best-reported regeneration methods. By simultaneously integrating high recovery efficiency, low processing cost, and outstanding electrochemical performance, this work provides a practical, sustainable, and industrially viable closed-loop recycling strategy for spent LFP cathodes that is well-suited for large-scale application. [Display omitted] • A closed-loop route for spent LiFePO 4 recycling with 98.97% Li and 99.23% Fe recovery. • Sodium persulfate-assisted process enables efficient FePO 4 regeneration and separation. • Regenerated LiFePO 4 delivers 139.2 mAh g−1 at 1 C and 95.2% retention after 300 cycles at 5 C. • The process achieves 557.6 USD t−1 profit with lower cost and environmental impact. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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