Recikliranje grafitne elektrode kontaminirane s kovinami prehodnih elementov

magistrsko delo

Maša Vračevič (Author), Marjana Simonič (Mentor), Robert Dominko (Co-mentor)

Abstract

Ugotavljali smo ali lahko grafitne anode, predhodno kontaminirane s kationi prehodnih kovin, recikliramo in ponovno uporabimo. Grafitne anode smo izpostavili elektrolitu kamor smo dodali manganove ione v obliki soli Mn(AcAc)2 ter spremljali ali se le-ti vežejo v strukturo grafita, tako kot litijevi ioni. Pri tem smo koncentracije manganove soli v elektrolitu spreminjali in ugotavljali ali koncetracija vpliva na nadaljno elektrokemijsko delovanje celice. Prisotnost manganovih ionov smo ugotavljali s pomočjo ICP-OES analize. Rezultati so pokazali, da ioni prehodnih kovin prisotni v elektrolitu med procesom polnjenja zasedejo mesta na površini grafita. Kontaminirano grafitno anodo smo nato sprali s topilom DMC z namenom, da se iz grafitnega materiala odstranijo odvečne soli ter topila. Za zagotavljanje odstranitve manganovih ionov po postopku spiranja pa je bila zopet uporabljena ICP-OES analiza. Z uporabo topila DMC, ki je podoben sestavi elektrolta, smo uspešno podstranili soli mangana, kar so pokazali rezultati analiz ICP-OES in XPS. Mangana ni bilo možno zaznati na površini grafitne anode oziroma se je le ta nahajal v zelo majhnih koncnetracijah. Spran grafitni material smo uporabili v sveži celici in z elektrokemijskimi tehnikami preverili ali je le-ta primeren za ponovno uporabo.

Keywords

anode;recikliranje;prehodne kovine;elektrokemija;litij ionske baterije;magistrske naloge;

Data

Language:	Slovenian
Year of publishing:	2024
Typology:	2.09 - Master's Thesis
Organization:	UM FKKT - Faculty of Chemistry and Chemical Engineering
Publisher:	[M. Vračevič]
UDC:	544.6.076.324.2:546.26-161(043.2)
COBISS:	216334595
Views:	50
Downloads:	23
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	Recycling of graphite electrode contaminated with transition metal elements
Secondary abstract:	In this study, we investigated whether graphite anodes contaminated with transition metal cations can be recycled and reused. The graphite anodes were exposed to an electrolyte containing manganese ions in the form of Mn(AcAc)2, and we monitored whether these ions intercalate into the graphite structure similarly to lithium ions. The concentration of the manganese salt in the electrolyte was varied to determine its impact on the subsequent electrochemical performance of the cell. The presence of manganese ions was analysed by ICP-OES. The results indicated that transition metal ions from the electrolyte occupy surface sites on the graphite during the charging process. The contaminated graphite anode was then washed with DMC solvent to remove excess salts and solvents. ICP-OES analysis confirmed the successful removal of manganese ions after washing. Both the ICP-OES and XPS results showed that manganese was either undetectable or present in very low concentrations in the graphite structure. The washed graphite material was then tested in a fresh cell using electrochemical techniques, demonstrating its suitability for reuse.
Secondary keywords:	graphite anodes;recycle;transition metals;electrochemistry;lithium-ion battery;
Type (COBISS):	Master's thesis/paper
Thesis comment:	Univ. v Mariboru, Fak. za kemijo in kemijsko tehnologijo
Pages:	1 spletni vir (1 datoteka PDF (IX, 35 f.))
ID:	24751661