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Direct Reuse of Degraded LiFePO4 Electrodes with LiBH4 as Chemical Lithiation Reagent.

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Title: Direct Reuse of Degraded LiFePO4 Electrodes with LiBH4 as Chemical Lithiation Reagent.
Authors: Li, Feifan1,2 (AUTHOR), Chen, Chen1,2 (AUTHOR), Zheng, Zhen2 (AUTHOR), Li, Lei1,2 (AUTHOR) lilei0323@sjtu.edu.cn
Source: Journal of The Electrochemical Society. 2026, Vol. 173 Issue 9, p1-9. 9p.
Subjects: Lithium borohydride, Electrochemical electrodes, Lithium compounds, Energy storage, Electrodes, Renewable energy industry, Lithium-ion batteries
Abstract: The recycling of spent lithium iron phosphate (S-LFP) batteries is crucial for sustainable energy development. Herein, we report a facile and efficient direct regeneration strategy for S-LFP electrodes via spontaneous chemical lithiation using LiBH4. By simply soaking the S-LFP electrodes in a 0.2 M LiBH4/THF solution at room temperature for 6 min, the Li+ loss is replenished and the crystal structure is effectively restored. The regenerated LFP (R-LFP) electrodes exhibit a high discharge capacity of 141.94 mAh g−1 at 0.5 C and retain over 71% capacity after 500 cycles. This method, operating under mild conditions and avoiding complex steps, shows great potential for industrial application. Highlights: Room-temperature regeneration of spent LiFePO4 electrodes in 6 min using LiBH4. Direct electrode repair without disassembly, high heat, or complex reprocessing. LiBH4 serves as both lithium source and reductant, restoring capacity effectively. Aluminum current collector remains intact, ensuring structural compatibility. Regenerated electrodes show high capacity (141.94 mAh g−1) and long cycle life. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:The recycling of spent lithium iron phosphate (S-LFP) batteries is crucial for sustainable energy development. Herein, we report a facile and efficient direct regeneration strategy for S-LFP electrodes via spontaneous chemical lithiation using LiBH4. By simply soaking the S-LFP electrodes in a 0.2 M LiBH4/THF solution at room temperature for 6 min, the Li+ loss is replenished and the crystal structure is effectively restored. The regenerated LFP (R-LFP) electrodes exhibit a high discharge capacity of 141.94 mAh g−1 at 0.5 C and retain over 71% capacity after 500 cycles. This method, operating under mild conditions and avoiding complex steps, shows great potential for industrial application. Highlights: Room-temperature regeneration of spent LiFePO4 electrodes in 6 min using LiBH4. Direct electrode repair without disassembly, high heat, or complex reprocessing. LiBH4 serves as both lithium source and reductant, restoring capacity effectively. Aluminum current collector remains intact, ensuring structural compatibility. Regenerated electrodes show high capacity (141.94 mAh g−1) and long cycle life. [ABSTRACT FROM AUTHOR]
ISSN:00134651
DOI:10.1149/1945-7111/ae6401