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Zhao XX, Wang XT, Guo JZ, Gu ZY, Cao JM, Yang JL, Lu FQ, Zhang JP, Wu XL. Dynamic Li + Capture through Ligand-Chain Interaction for the Regeneration of Depleted LiFePO 4 Cathode. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2024; 36:e2308927. [PMID: 38174582 DOI: 10.1002/adma.202308927] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/01/2023] [Revised: 12/20/2023] [Indexed: 01/05/2024]
Abstract
After application in electric vehicles, spent LiFePO4 (LFP) batteries are typically decommissioned. Traditional recycling methods face economic and environmental constraints. Therefore, direct regeneration has emerged as a promising alternative. However, irreversible phase changes can significantly hinder the efficiency of the regeneration process owing to structural degradation. Moreover, improper storage and treatment practices can lead to metamorphism, further complicating the regeneration process. In this study, a sustainable recovery method is proposed for the electrochemical repair of LFP batteries. A ligand-chain Zn-complex (ZnDEA) is utilized as a structural regulator, with its ─NH─ group alternatingly facilitating the binding of preferential transition metal ions (Fe3+ during charging and Zn2+ during discharging). This dynamic coordination ability helps to modulate volume changes within the recovered LFP framework. Consequently, the recovered LFP framework can store more Li-ions, enhance phase transition reversibility between LFP and FePO4 (FP), modify the initial Coulombic efficiency, and reduce polarization voltage differences. The recovered LFP cells exhibit excellent capacity retention of 96.30% after 1500 cycles at 2 C. The ligand chain repair mechanism promotes structural evolution to facilitate ion migration, providing valuable insights into the targeted ion compensation for environmentally friendly recycling in practical applications.
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Affiliation(s)
- Xin-Xin Zhao
- Faculty of Chemistry, Northeast Normal University, Changchun, 130024, P. R. China
| | - Xiao-Tong Wang
- MOE Key Laboratory for UV Light-Emitting Materials and Technology, Northeast Normal University, Changchun, 130024, P. R. China
| | - Jin-Zhi Guo
- MOE Key Laboratory for UV Light-Emitting Materials and Technology, Northeast Normal University, Changchun, 130024, P. R. China
| | - Zhen-Yi Gu
- MOE Key Laboratory for UV Light-Emitting Materials and Technology, Northeast Normal University, Changchun, 130024, P. R. China
| | - Jun-Ming Cao
- MOE Key Laboratory for UV Light-Emitting Materials and Technology, Northeast Normal University, Changchun, 130024, P. R. China
| | - Jia-Lin Yang
- MOE Key Laboratory for UV Light-Emitting Materials and Technology, Northeast Normal University, Changchun, 130024, P. R. China
| | - Feng-Qi Lu
- Guangxi Key Laboratory of Optical and Electronic Materials and Devices, College of Materials Science and Engineering, Guilin University of Technology, Guilin, 541004, P. R. China
| | - Jing-Ping Zhang
- Faculty of Chemistry, Northeast Normal University, Changchun, 130024, P. R. China
| | - Xing-Long Wu
- Faculty of Chemistry, Northeast Normal University, Changchun, 130024, P. R. China
- MOE Key Laboratory for UV Light-Emitting Materials and Technology, Northeast Normal University, Changchun, 130024, P. R. China
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