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Direct Regeneration of Spent LiFePO4 Using Methionine for Defect Repair and N/S-Doped Interface Construction
Xutao Liang1, Ran Wang1, Bo Zhang1
1College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan, Shanxi, China.
Small (Weinheim an Der Bergstrasse, Germany)
|July 31, 2026
Summary
Recycling spent lithium iron phosphate (LiFePO4) batteries is challenging. A new method uses methionine to regenerate cathodes, enhancing performance and sustainability for electric vehicle batteries.
Area of Science:
- Materials Science
- Electrochemistry
- Sustainable Chemistry
Background:
- Spent lithium-ion batteries, especially those with LiFePO4 cathodes, pose recycling challenges due to degradation from Li loss and Fe(III) formation.
- Conventional recycling methods are energy-intensive, polluting, and economically inefficient.
- Developing sustainable and effective cathode regeneration techniques is crucial for electric vehicle battery lifecycle management.
Purpose of the Study:
- To develop a direct regeneration strategy for degraded LiFePO4 cathodes.
- To address Li loss-induced lattice defects and Fe(III) phase formation.
- To improve the electrochemical performance and recyclability of spent LiFePO4 cathodes.
Main Methods:
- Utilizing methionine as a multifunctional reducing agent for direct cathode regeneration.
- Employing methionine to repair crystal defects and create a N/S-doped interface.
- Annealing to form an in-situ N/S-doped carbon coating for enhanced conductivity and stability.
Main Results:
- Regenerated LiFePO4 (R-LFP) demonstrated a high discharge capacity of 150.76 mAh g⁻¹ at 1.0 C.
- R-LFP exhibited excellent cycling stability, retaining over 87% capacity after 800 cycles.
- The N/S-doped interface effectively improved electronic conductivity and stabilized the crystal structure.
Conclusions:
- The proposed methionine-based regeneration strategy offers an efficient and sustainable method for upcycling spent LiFePO4 cathodes.
- This approach effectively repairs cathode defects and enhances electrochemical performance, comparable to commercial LiFePO4.
- This work presents a viable solution for the growing challenge of electric vehicle battery recycling.
