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Investigation of Centrifugal Fractionation with Time-Dependent Process Parameters as a New Approach Contributing to the Direct Recycling of Lithium-Ion Battery Components

Sinn, Tabea; Flegler, Andreas; Wolf, Andreas; Stübinger, Thomas; Witt, Wolfgang; Nirschl, Hermann; Gleiß, Marco

Recycling of lithium-ion batteries will become imperative in the future, but comprehensive and sustainable processes for this are still rather lacking. Direct recycling comprising separation of the black mass components as a key step is regarded as the most seminal approach. This paper contributes a novel approach for such separation, that is fractionation in a tubular centrifuge. An aqueous dispersion of cathode materials (lithium iron phosphate, also referred to as LFP, and carbon black) serves as exemplary feed to be fractionated, desirably resulting in a sediment of pure LFP. This paper provides a detailed study of the commonly time-dependent output of the tubular centrifuge and introduces an approach aiming to achieve constant output. Therefore, three different settings are assessed, constantly low, constantly high and an increase in rotational speed over time. Constant settings result in the predictable unsatisfactory time-variant output, whereas rotational speed increase proves to be able to maintain constant centrate properties. With further process development, the concept of fractionation in tubular centrifuges may mature into a promising separation technique for black mass in a direct recycling process chain.

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Verlagsausgabe §
DOI: 10.5445/IR/1000129663
Veröffentlicht am 12.02.2021
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Mechanische Verfahrenstechnik und Mechanik (MVM)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2020
Sprache Englisch
Identifikator ISSN: 2075-4701
KITopen-ID: 1000129663
Erschienen in Metals
Verlag MDPI
Band 10
Heft 12
Seiten Art.-Nr.: 1617
Vorab online veröffentlicht am 01.12.2020
Schlagwörter fractionation; tubular centrifuge; rotational speed control; particle size analysis; lithium iron phosphate; LFP; carbon black; lithium-ion battery; direct battery recycling; recovery
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