2023
DOI: 10.1002/adma.202309722
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A Multifunctional Amino Acid Enables Direct Recycling of Spent LiFePO4 Cathode Material

Di Tang,
Guanjun Ji,
Junxiong Wang
et al.

Abstract: Lithium iron phosphate (LiFePO4, LFP) batteries are extensively used in electric vehicles and energy storage due to their good cycling stability and safety. However, the finite service life of lithium‐ion batteries leads to significant amounts of retired LFP batteries, urgently required to be recycled by environmentally friendly and effective methods. Here, a direct regeneration strategy using natural and low‐cost L‐threonine as a multifunctional reductant is proposed. The hydroxyl groups and amino groups in L… Show more

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Cited by 33 publications
(2 citation statements)
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References 47 publications
(81 reference statements)
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“…According to the Rietveld refinement results calculated from XRD, the defect value was reduced from 2.85 (Figure 2e; Table S2, Supporting Information) to 2.452% (Figure 2f; Table S3, Supporting Information). Reducing antisite defects is vital for improving Li + diffusion, 38 consistent with the lower charge voltage plateau exhibited by R-LFP, as shown in Figure 1c. C-LFP requires a higher overpotential to overcome the impediment due to defects obstructing Li + diffusion channels, while the extra electrons R-LFP gained from the anode side can reduce Fe 3+ , thereby leading to a decrease in the activation barrier of cation migration, thus reordering the transport channels for better Li + diffusion.…”
Section: Design Concept Of the Repair Strategy Based Onsupporting
confidence: 68%
“…According to the Rietveld refinement results calculated from XRD, the defect value was reduced from 2.85 (Figure 2e; Table S2, Supporting Information) to 2.452% (Figure 2f; Table S3, Supporting Information). Reducing antisite defects is vital for improving Li + diffusion, 38 consistent with the lower charge voltage plateau exhibited by R-LFP, as shown in Figure 1c. C-LFP requires a higher overpotential to overcome the impediment due to defects obstructing Li + diffusion channels, while the extra electrons R-LFP gained from the anode side can reduce Fe 3+ , thereby leading to a decrease in the activation barrier of cation migration, thus reordering the transport channels for better Li + diffusion.…”
Section: Design Concept Of the Repair Strategy Based Onsupporting
confidence: 68%
“…The solution-based recovery method for LFP materials holds promise for restoring both Li losses and the formation of Fe-Li defects, particularly in cases of severe degradation and substantial capacity decay [53]. The revival of these defects is crucial for achieving complete material recovery and optimal performance.…”
Section: Nickel-manganese-cobalt Oxide (Nmc)mentioning
confidence: 99%