Valorizacija kobalta iz istrošenih litijum-jonskih baterija luženjem u sistemima H2SO4-N2 i H2SO4-O2 i metodom elektrohemijskog taloženja Naučni rad
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Tema rada je valorizacija kobalta iz katodnog materijala istrošenih litijum-jonskih baterija (LIBs) primenom metoda luženja i elektrohemijskog taloženja. Tokom eksperimenata luženja upoređivani su stepeni rastvaranja katodnog materijala u sistemima H2SO4-N2 i H2SO4-O2. Maksimalni stepeni ekstrakcije kobalta od 40 % u sistemu luženja H2SO4-N2 i 47 % u sistemu H2SO4-O2 postignuti su pod sledećim eksperimentalnim uslovima: koncentracija H2SO4 2 mol L-1, zapreminski protok azota/kiseonika 2 L min-1, koncentracija čvrste faze od 33 g L-1, i temperatura od 85 °C. Kinetika ekstrakcije kobalta iz katodnog materijala, u oba ispitivana sistema, bila je najpovoljnija u prvih 15 min, nakon čega je došlo do naglog smanjenja brzine reakcije. Kobalt je deponovan iz rastvora za luženje na bakarnu podlogu metodom galvanostatskog taloženja sa iskorišćenjem struje od 84 %. Potrošnja energije je bila 5.8 kWh kg-1 deponovanog kobalta. Metoda ciklične voltametrije (CV) korišćena je za određivanje potencijala taloženja kobalta, kao i sporednih reakcija koje se odvijaju u sistemu. Metodom skenirajuće elektronske mikroskopije sa energetsko disperzivnom spektrometrijom utvrđeno je da je tokom procesa elektrohemijskog taloženja kobalta došlo do aglomeracije čestica kobalta (u obliku karfiola) i da je kobalt deponovan u njegovom elementarnom stanju, što je potvrđeno rezultatima rendgenske difrakcione analize.
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Ministarstvo Prosvete, Nauke i Tehnološkog Razvoja
Grant numbers 451-03-47/2023-01/ 20013;451-03-47/2023-01/ 200052
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