Regeneration of LiFePO<sub>4</sub> from Spent Materials: Control and Influence of Al Impurity
Owing to the rapid increase of lithium iron phosphate (LiFePO<sub>4</sub>) batteries, recycling and regeneration of LiFePO<sub>4</sub> enjoys significances for sustainable development and environmental protection. In this study, an effective regeneration method for spent LiFePO<sub>4</sub> materials and the influence of Al impurity on the electrochemical performance of regenerated LiFePO<sub>4</sub> were studied. Firstly, 99.26 % Fe, 99.52 % P, 99.58 % Li, 59.36 % Al and 20.24 % Cu in spent LiFePO<sub>4</sub> material were leached with 150 g ⋅ L<sup>-1</sup> H<sub>2</sub>SO<sub>4</sub>. Subsequently, Al removal and control were achieved by simply adjusting the pH value, and FePO<sub>4</sub> ⋅ 2H<sub>2</sub>O precursors with different Al contents were prepared. Specially, the LiFePO<sub>4</sub> regenerated by FePO<sub>4</sub> ⋅ 2H<sub>2</sub>O precursor containing 0.096 % Al exhibits excellent electrochemical performance with discharge capacity of 145 mAh ⋅ g<sup>-1</sup>, 140.5 mAh ⋅ g<sup>-1</sup> and 130.9 mAh ⋅ g<sup>-1</sup> at the current density of 1 C, 2 C and 5 C, respectively.
Authors
- Jiexiang Li (ORCID: https://orcid.org/0000-0002-6515-6466)
- Shaole Song (ORCID: https://orcid.org/0000-0001-8366-0124)
- Wei Sun (ORCID: https://orcid.org/0000-0002-9113-4279)
- Runqing Liu
- Yue Yang (ORCID: https://orcid.org/0000-0002-8270-9464)
Institutions
- Ministry of Education of the People's Republic of China (CN)
- Central South University (CN)
Publication Details
- Journal
- ChemSusChem
- Published
- 2024-09-06
- DOI
- https://doi.org/10.1002/cssc.202401432
- Citations
- 10
- Primary Topic
- Extraction and Separation Processes
- Type
- article
- Field-Weighted Citation Impact
- 2.13