Chemistry evolution of LiFePO4-NaHSO4·H2O system during roasting and recovery of Li and Fe
Source abstract
Abstract
LiFePO 4 batteries are extensively utilized in new energy vehicles and energy storage applications. The recycling and utilization of spent LiFePO 4 cathode materials have emerged as a new focus in the power battery industry, and have garnered widespread attention since the trend of power battery retirement continues. This article delves into the chemical transformations in the LiFePO 4-NaHSO 4·H 2O system during roasting-water leaching to recover Li and Fe. Characterization techniques like thermogravimetric-differential scanning calorimetry (TG-DSC), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and inductively coupled plasma-atomic emission spectrometry (ICP-AES) were used for analysis. The LiFePO 4 and NaHSO 4·H 2O mixture with a 1:1.6 molar ratio exhibited significant endothermic and exothermic phenomena within the 25–600 °C temperature range. With increased roasting temperatures, elements Li, Fe, and P underwent the following chemical evolution pathways: Li: LiFePO 4 → LiNaSO 4 + Li 3PO 4 → LiNaSO 4 + Li 3Fe 2(PO 4) 3 → LiNaSO 4, Fe: LiFePO 4 → FeSO 4·H 2O + Fe 3(PO 4) 2 → Fe 3(PO 4) 2 + Li 3Fe 2(PO 4) 3 → Li 3Fe 2(PO 4) 3 + NaFeP 2O 7 → NaFeP 2O 7 + Fe 2(SO 4) 3, and P: LiFePO 4 → Fe 3(PO 4) 2 + Li 3PO 4 → Fe 3(PO 4) 2 + Li 3Fe 2(PO 4) 3 → Li 3Fe 2(PO 4) 3 + NaFeP 2O 7 → NaFeP 2O 7. The element occurrence form in the roasting products influences the leaching rates of Li and Fe. Although the Fe leaching rate decreased from 27.64 % to 0.56 % as the roasting temperature rose from 200 to 600 °C, the Li leaching rate remained between 86.43 % and 98.40 %.
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Research context
OpenAlex topics: Extraction and Separation Processes · Metal Extraction and Bioleaching · Minerals Flotation and Separation Techniques
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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