Issue 2, 2023

Large-scale direct regeneration of LiFePO4@C based on spray drying

Abstract

Direct regeneration is a low-cost and environmentally friendly way of recycling spent Li-ion batteries. In this study, a new method is adopted to regenerate spent LiFePO4. First, the spent LiFePO4 powder is homogenized, and then, small amounts of a lithium source and a carbon source are thoroughly mixed by spray drying. After that, a high-temperature solid-phase method is used to regenerate the carbon-coated lithium iron phosphate. Compared with traditional regeneration methods, the proposed method significantly improves the universality of spent LiFePO4 having different degrees of damage. The regenerated LiFePO4 is characterized using X-ray diffraction, scanning electron microscopy, transmission electron microscopy, Raman spectroscopy, and electrochemical measurements. The results show that the regenerated sample has a stable morphology, structure, and electrochemical performance. Under the conditions of 0.1C, the initial capacity exceeds 160 mA h g−1. After 800 cycles under the conditions of 1C, the capacity retention is 80%, which satisfies the requirements for regenerated LiFePO4 batteries.

Keywords: LiFePO4; Direct regeneration; Homogenization; Spray drying; Electrochemical performance.

Graphical abstract: Large-scale direct regeneration of LiFePO4@C based on spray drying

Supplementary files

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Article information

Article type
Paper
Submitted
21 7月 2022
Accepted
18 11月 2022
First published
13 12月 2022
This article is Open Access
Creative Commons BY license

Ind. Chem. Mater., 2023,1, 254-261

Large-scale direct regeneration of LiFePO4@C based on spray drying

Y. Zou, J. Cao, H. Li, W. Wu, Y. Liang and J. Zhang, Ind. Chem. Mater., 2023, 1, 254 DOI: 10.1039/D2IM00007E

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