Li, Min
(2019)
Synthesis, characterization and electrochemical study of titanium hexacyanoferrate electrode material.
[Laurea magistrale], Università di Bologna, Corso di Studio in
Chimica industriale [LM-DM270]
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Abstract
Titanium Hexacyanoferrate (TiHCF) was synthesized by simple co-precipitation method, and the crystal structure, water content, chemical formula and a deep structural investigation (local geometry of Ti) of as-prepared sample were done by PXRD, FT-IR, TGA, MP-AES and XAS. Electrochemical tests were performed both in glass and coin cells. From cyclic voltammetry curves, we observed redox peaks of both Fe3+/2+ and Ti4+/3+ pairs. The calculation result based on scan rate and current shows that the capacity of battery is controlled by diffusion process in aqueous electrolyte system. The as-prepared sample also shows high performance in organic electrolyte system. Compared to Li-ion batteries, the material shows high capacity for Na-ion batteries with 74 mAh/g at C/20 rate, while Li-ion batteries only have 35 mAh/g. The specific energy value we got for Na-ion coin cell is 250 Wh/kg (based on the mass of active material) and 122 Wh/kg for Li-ion coin cell. Both Li- and Na- half cells display high coulombic efficiency during cyclability test, above 95%.
Abstract
Titanium Hexacyanoferrate (TiHCF) was synthesized by simple co-precipitation method, and the crystal structure, water content, chemical formula and a deep structural investigation (local geometry of Ti) of as-prepared sample were done by PXRD, FT-IR, TGA, MP-AES and XAS. Electrochemical tests were performed both in glass and coin cells. From cyclic voltammetry curves, we observed redox peaks of both Fe3+/2+ and Ti4+/3+ pairs. The calculation result based on scan rate and current shows that the capacity of battery is controlled by diffusion process in aqueous electrolyte system. The as-prepared sample also shows high performance in organic electrolyte system. Compared to Li-ion batteries, the material shows high capacity for Na-ion batteries with 74 mAh/g at C/20 rate, while Li-ion batteries only have 35 mAh/g. The specific energy value we got for Na-ion coin cell is 250 Wh/kg (based on the mass of active material) and 122 Wh/kg for Li-ion coin cell. Both Li- and Na- half cells display high coulombic efficiency during cyclability test, above 95%.
Tipologia del documento
Tesi di laurea
(Laurea magistrale)
Autore della tesi
Li, Min
Relatore della tesi
Correlatore della tesi
Scuola
Corso di studio
Indirizzo
Advanced Spectroscopy in Chemistry
Ordinamento Cds
DM270
Parole chiave
titanium hexacyanoferrate cathode material aqueous electrolyte organic electrolyte
Data di discussione della Tesi
26 Luglio 2019
URI
Altri metadati
Tipologia del documento
Tesi di laurea
(NON SPECIFICATO)
Autore della tesi
Li, Min
Relatore della tesi
Correlatore della tesi
Scuola
Corso di studio
Indirizzo
Advanced Spectroscopy in Chemistry
Ordinamento Cds
DM270
Parole chiave
titanium hexacyanoferrate cathode material aqueous electrolyte organic electrolyte
Data di discussione della Tesi
26 Luglio 2019
URI
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