TY - GEN
T1 - A highly soluble redox shuttle with superior rate performance in overcharge protection
AU - Odom, Susan A.
AU - Kaur, Aman
AU - Ergun, Selin
AU - Elliott, Corrine F.
AU - Casselman, Matthew D.
N1 - Publisher Copyright:
© 2015 Materials Research Society.
PY - 2015
Y1 - 2015
N2 - The demand for a stable and compatible redox shuttles for use in lithium-ion batteries has prompted us to explore strategies to tune and improve the properties of redox shuttles. We have studied over 50 new diarylamine derivatives synthesized in our laboratory including one compound in which we introduced trifluoromethyl groups (-CF3) at the positions para to the nitrogen atom in N-ethylphenothiazine (EPT). The high electronegativity of the CF3 group raises the oxidation potential, and its incorporation also significantly increases solubility in battery electrolyte. Here we report 3,7-bis(trifluoromethyl)-N-ethylphenothiazine (BCF3EPT) as a new redox shuttle, which we have observed to have the highest reported solubility in battery electrolyte of all redox shuttles that maintain extended overcharge performance. We have compared its performance with 1,3-di-tert-butyl-2,5-dimethoxybenzene (DBB), EPT, and other robust redox shuttles. In our hands, overcharge cycling of BCF3EPT far surpasses any reported redox shuttle, and - because it can be dissolved at higher concentrations - it tolerates faster charging rates than both DBB and EPT.
AB - The demand for a stable and compatible redox shuttles for use in lithium-ion batteries has prompted us to explore strategies to tune and improve the properties of redox shuttles. We have studied over 50 new diarylamine derivatives synthesized in our laboratory including one compound in which we introduced trifluoromethyl groups (-CF3) at the positions para to the nitrogen atom in N-ethylphenothiazine (EPT). The high electronegativity of the CF3 group raises the oxidation potential, and its incorporation also significantly increases solubility in battery electrolyte. Here we report 3,7-bis(trifluoromethyl)-N-ethylphenothiazine (BCF3EPT) as a new redox shuttle, which we have observed to have the highest reported solubility in battery electrolyte of all redox shuttles that maintain extended overcharge performance. We have compared its performance with 1,3-di-tert-butyl-2,5-dimethoxybenzene (DBB), EPT, and other robust redox shuttles. In our hands, overcharge cycling of BCF3EPT far surpasses any reported redox shuttle, and - because it can be dissolved at higher concentrations - it tolerates faster charging rates than both DBB and EPT.
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U2 - 10.1557/opl.2015.204
DO - 10.1557/opl.2015.204
M3 - Conference contribution
AN - SCOPUS:84939448131
T3 - Materials Research Society Symposium Proceedings
SP - 19
EP - 24
BT - Materials Challenges for Energy Storage Across Multiple Scales
A2 - Cresce, A.
T2 - 2014 MRS Fall Meeting
Y2 - 30 November 2014 through 5 December 2014
ER -
