On the Oxidation State of Manganese Ions in Li-Ion Battery Electrolyte Solutions.
J Am Chem Soc
; 139(5): 1738-1741, 2017 02 08.
Article
em En
| MEDLINE
| ID: mdl-28122187
ABSTRACT
We demonstrate herein that Mn3+ and not Mn2+, as commonly accepted, is the dominant dissolved manganese cation in LiPF6-based electrolyte solutions of Li-ion batteries with lithium manganate spinel positive and graphite negative electrodes chemistry. The Mn3+ fractions in solution, derived from a combined analysis of electron paramagnetic resonance and inductively coupled plasma spectroscopy data, are â¼80% for either fully discharged (3.0 V hold) or fully charged (4.2 V hold) cells, and â¼60% for galvanostatically cycled cells. These findings agree with the average oxidation state of dissolved Mn ions determined from X-ray absorption near-edge spectroscopy data, as verified through a speciation diagram analysis. We also show that the fractions of Mn3+ in the aprotic nonaqueous electrolyte solution are constant over the duration of our experiments and that disproportionation of Mn3+ occurs at a very slow rate.
Texto completo:
1
Base de dados:
MEDLINE
Idioma:
En
Revista:
J Am Chem Soc
Ano de publicação:
2017
Tipo de documento:
Article
País de afiliação:
Israel