Optimization of aqueous Zn-ion batteries

Askarzadehardestani, Maedeh (2022) Optimization of aqueous Zn-ion batteries. [Laurea magistrale], Università di Bologna, Corso di Studio in Low carbon technologies and sustainable chemistry [LM-DM270], Documento ad accesso riservato.
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Abstract

MnHCF was synthesized by simple co-precipitation method. In this work we investigate the electrochemical behavior of manganese hexacyanoferrate in zinc sulfate (ZnSO4), ZnSO4+MnSO4 and zinc triflate (Zn(OTF)2) aqueous electrolytes. Electrochemical tests were performed by both El-cell which is designed for reflection investigation and coin cell. In cyclic voltammetry curves, we observed redox peaks of both Fe3+/2+ and Mn3+/2+ pairs. The results based on current shows that the capacity of battery is controlled by diffusion process in aqueous electrolyte system. MnHCF undergoes severe dissolution and zinc displacement during cycling. Compared to ZnSO4, anions of Zn (OTF)2 electrolyte are strongly adsorbed on the electrolyte surface, in turn hindering the water oxidation reaction and reducing the decomposition of MnHCF. The MnHCF/Zn battery using 3M Zn (OTF)2 delivers a specific capacity of 41 mAhg-1 at 50 mAg-1 while by using 3M ZnSO4+1M MnSO4 the specific capacity reaches to 400 mAhg-1 for the pure sample and around 250 mAhg-1 for the MnHCF+A. Our results suggest that the anions in the aqueous electrolyte are of great importance to optimize the electrochemical performance of metal hexacyanoferrates. The pre-addition of MnSO4 into ZnSO4 solution is capable of easing the Mn2+ dissolution from the cathode.

Abstract
Tipologia del documento
Tesi di laurea (Laurea magistrale)
Autore della tesi
Askarzadehardestani, Maedeh
Relatore della tesi
Correlatore della tesi
Scuola
Corso di studio
Ordinamento Cds
DM270
Parole chiave
zinc ion batteries El cell electrolyte
Data di discussione della Tesi
21 Ottobre 2022
URI

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