Construction of a Preoxidation and Cation Doping Regeneration Strategy to Improve Rate Performance Recycling Spent LiFePO4 Materials

Xiangnan Li; Ming Ge; Qibin Zhou; Zhangchen Gao; Yuantao Cui; Mengdan Zhang; Xinyu Tang; Huishuang Zhang; Zhenpu Shi; Yanhong Yin; Shuting Yang

doi:10.1021/acs.langmuir.3c01530

Construction of a Preoxidation and Cation Doping Regeneration Strategy to Improve Rate Performance Recycling Spent LiFePO₄ Materials

Langmuir. 2023 Sep 19;39(37):13132-13139. doi: 10.1021/acs.langmuir.3c01530. Epub 2023 Sep 1.

Authors

Xiangnan Li^{1

2

3

4}, Ming Ge^{1

2

3}, Qibin Zhou^{1

2

3}, Zhangchen Gao⁵, Yuantao Cui^{1

2

3}, Mengdan Zhang^{1

2

3}, Xinyu Tang^{1

2

3}, Huishuang Zhang^{1

2

3}, Zhenpu Shi^{1

2

3}, Yanhong Yin^{1

2

3}, Shuting Yang^{1

2

3}

Affiliations

¹ School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan 453007, China.
² National and Local Joint Engineering Laboratory of Motive Power and Key Materials, Xinxiang, Henan 453007, China.
³ Collaborative Innovation Center of Henan Province for Motive Power and Key Materials, Xinxiang, Henan 453007, China.
⁴ School of Physics, Henan Normal University, Xinxiang, Henan 453007, China.
⁵ Henan Battery Research Institute Company Limited, Xinxiang, Henan 453000, China.

PMID: 37656965
DOI: 10.1021/acs.langmuir.3c01530

Abstract

Efficient recycling of spent lithium-ion batteries (LIBs) is significant for solving environmental problems and promoting resource conservation. Economical recycling of LiFePO₄ (LFP) batteries is extremely challenging due to the inexpensive production of LFP. Herein, we report a preoxidation combine with cation doping regeneration strategy to regenerate spent LiFePO₄ (SLFP) with severely deteriorated. The binder, conductive agent, and residual carbon in SLFP are effectively removed through preoxidation treatment, which lays the foundation for the uniform and stable regeneration of LFP. Mg²⁺ doping is adopted to promote the diffusion efficiency of lithium ions, reduces the charge-transfer impedance, and further improves the electrochemical performance of the regenerated LFP. The discharge capacity of SLFP with severe deterioration recovers successfully from 43.2 to 136.9 mA h g^-1 at 0.5 C. Compared with traditional methods, this technology is simple, economical, and environment-friendly. It provided an efficient way for recycling SLFP materials.