Separating metal impurities from spent ternary Li-ion batteries materials based on the roasting characteristics

Wang, Yu; Tu, Yanan; Xu, Zhiqiang; Zhang, Xi; Chen, Yang; Yang, EnZe

doi:10.1007/s11581-021-04423-0

Cited by 6 publications

(5 citation statements)

References 54 publications

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“…possible reaction route was inferred (Reactions ( 1)-( 3)) [39,43]. All in all, the XPS results suggest that the organic binders and electrolytes have been completely decomposed after roasting.…”

Section: Xps Analysismentioning

confidence: 84%

“…The content of the Li-F peak at 685.10 eV is 29.17%, which is partly due to the transfer of the F element in electrolyte and organic binder and its combination with valuable metal Li to form metal fluoride. According to the analysis of the chemical state of the F element combined with the existing literature, a possible reaction route was inferred (Reactions (1)-( 3)) [39,43]. All in all, the XPS results suggest that the organic binders and electrolytes have been completely decomposed after roasting.…”

Section: Xps Analysismentioning

confidence: 92%

“…The second weight-loss stage appears in the temperature range of 150-450 °C. This is attributed to the thermal decomposition of electrolytes remaining in the spent LIB materials [39], and the weight loss rate is 5.18%. The third weight-loss stage is in the temperature range of 450-550 °C.…”

Section: Thermogravimetric Analysis Of Raw Spent Libs Materialsmentioning

confidence: 99%

“…From Figure 5, the spent LIB materials present four weightlessness stages, all in the range of room temperature to 850 • C. The first weight-loss stage occurs in a temperature range of room temperature to 150 • C. At this stage, the weight loss rate is 4.08%, and there is no obvious endothermic or exothermic peak in the derivative thermogravimetric (DTG) curve, which is attributed to the water being volatilized [38]. The second weight-loss stage appears in the temperature range of 150-450 • C. This is attributed to the thermal decomposition of electrolytes remaining in the spent LIB materials [39], and the weight loss rate is 5.18%. The third weight-loss stage is in the temperature range of 450-550 • C. This stage mainly comprises the combustion reaction of PVDF on the surface of the electrode materials [37], and the weight loss rate is 3.48%.…”

Section: Thermogravimetric Analysis Of Raw Spent Libs Materialsmentioning

confidence: 99%

“…The pyrolysis method has the advantage of low secondary pollution. Sun and Qiu [37][38][39][40] proposed a novel method with which to separate cathode materials by means of vacuum pyrolysis. Through the process of pyrolysis, the electrolyte and binder were evaporated or decomposed, which reduced the adhesion of the cathode material and collector.…”

Section: Introductionmentioning

confidence: 99%

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Separation of Graphites and Cathode Materials from Spent Lithium-Ion Batteries Using Roasting–Froth Flotation

Zhang

Wang

et al. 2022

Sustainability

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The separation of graphites and cathode materials from spent lithium-ion batteries (LIBs) is essential to close the loop of material used in LIBs. In this study, the roasting characteristics of the spent LIB materials are carefully analyzed, and the effects of roasting on the surface morphology and elemental chemical states of electrode materials are fully investigated by thermogravimetric analysis, SEM-EDS, and XPS to explore the roasting–flotation enhancement mechanism. Then, froth flotation is utilized to separate the graphites and cathode materials from the spent LIB materials. The optimal roasting temperature is determined by thermogravimetric analysis and the SEM-EDS analysis of the spent LIB materials. The results suggest that the organic binder can be effectively removed from the spent LIB materials at the roasting temperature of 500 °C, and there is almost no loss of graphite. The XPS results indicate that, in the process of roasting, the decomposition products of the organic binder can easily react with valuable metals (Ni, Co, and Mn) to produce corresponding metal fluoride. The flotation results of the spent LIB materials after roasting at the optimal conditions indicate that graphites and cathode materials can be efficiently recovered through roasting–froth flotation. When the dosage of kerosene is 200 g/t and the dosage of methyl isobutyl carbinol (MIBC) is 150 g/t, the cathode materials grade is 91.6% with a recovery of 92.6%, while the graphite grade is 84.6% with a recovery of 82.7%. The roasting–froth flotation method lays the foundation for the subsequent metallurgical process.

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Section: Xps Analysismentioning

confidence: 84%

Section: Xps Analysismentioning

confidence: 92%

Section: Thermogravimetric Analysis Of Raw Spent Libs Materialsmentioning

confidence: 99%