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Adsorption-Mediated Interfacial Engineering for Direct Regeneration of Spent LiFePO4 Cathodes
Chengzhi Feng1, Wei Mao2, Peiji Yin1
1State Key Laboratory of Environment-Friendly Energy Materials, School of Materials and Chemistry, Southwest University of Science and Technology, Mianyang 621010, China.
ACS Nano
|January 2, 2026
Summary
Researchers developed a new method to regenerate spent lithium iron phosphate (LiFePO4) cathode materials for electric vehicles. This approach uses adsorption-mediated interfacial engineering to reduce energy consumption and improve battery performance, offering a sustainable recycling solution.
Area of Science:
- Materials Science
- Electrochemistry
- Sustainable Chemistry
Background:
- The electric vehicle industry's growth generates substantial lithium-ion battery waste.
- Direct regeneration of spent cathode materials is crucial for sustainable battery recycling.
- Current regeneration methods are often energy-intensive and inefficient.
Purpose of the Study:
- To develop an energy-efficient and scalable method for regenerating spent LiFePO4 cathode materials.
- To investigate the effectiveness of adsorption-mediated interfacial engineering for cathode repair.
- To enhance the electrochemical performance of recycled LiFePO4.
Main Methods:
- Constructing a uniform, lithium-rich layer on spent LiFePO4 (S-LFP) using organic lithium carboxylate salts.
- Utilizing this tailored interface as a precursor for thermal annealing.
- Employing a hybrid approach combining adsorption and annealing for lithium insertion and defect healing.
Main Results:
- The regenerated LFP (R-LFP) exhibited a high specific discharge capacity of 145.5 mAh g⁻¹ at 1.0 C.
- The R-LFP maintained 88.1% of its capacity after 400 cycles.
- The hybrid method significantly reduced energy consumption compared to conventional techniques.
Conclusions:
- Adsorption-mediated interfacial engineering is a pivotal strategy for efficient S-LFP regeneration.
- The developed hybrid approach offers a scalable and cost-effective pathway for battery recycling.
- This method advances sustainable solutions for the growing electric vehicle battery waste.
