@article{Li2025, 
author = {Yuyun Li and Changjiang Li and Fanbin Hu and Wanquan Yu and Haigang Dong and Qi Meng and Ziyi Zhu and Peng Dong},
title = {Direct regeneration of spent LiFePO4 cathode materials through Li+ supplementation and Sm doping},
year = {2025},
journal = {Nano Research Energy},
volume = {4},
pages = {e9120190},
keywords = {electrochemical performance, spent LiFePO4 materials, Sm doping, Li+ supplementation},
url = {https://www.sciopen.com/article/10.26599/NRE.2025.9120190},
doi = {10.26599/NRE.2025.9120190},
abstract = {LiFePO4 is widely used as a stable and environmentally benign cathode material. However, its reuse potential is constrained by recycling challenges and significant performance degradation after decommissioning. Therefore, how to effectively improve the electrochemical performance of regenerated LiFePO4 materials and enhance their stability during cycling has become the focus of current research. In this research, Sm doping was introduced to optimize regenerated LiFePO4 cathode materials via a plasma ball milling assisted solid-state calcination method. Comparison between spent LiFePO4 and Sm-doped regenerated cathodes revealed that the appropriate level of Sm doping effectively maintained the crystal structure of LiFePO4. It also promoted a more uniform particle morphology and a reduced particle size, which is beneficial for shortening Li+ transport pathways. This enhancement significantly improved electronic conductivity, leading to enhanced electrochemical performance. The 2% Sm doped regenerated material exhibited optimal performance, achieving an initial charge-discharge specific capacity of 142.2 mAh·g–1 at 1 C and maintaining a capacity retention of 96.5% after 200 cycles. This conclusion is of significant importance for improving resource utilization efficiency of spent LiFePO4 batteries.}
}