Refine your search�ソスF     
Report No.
 - 

Operando Br K-edge dispersive X-ray absorption fine structure analysis for Br$$^{-}$$/Br$$_{3}$$$$^{-}$$ redox mediator for Li-Air batteries

Ito, Kimihiko*; Matsumura, Daiju   ; Song, C.*; Kubo, Yoshimi*

The behavior of Br$$^{-}$$/Br$$_{3}^{-}$$ redox mediator (RM), which has been shown to suppress charging overpotential in lithium-air batteries, has been detected for the first time using operando Br K-edge dispersive X-ray absorption fine structure. Br$$_{3}^{-}$$ ions in the electrolyte increase monotonically after $$sim$$ 30% charging, which indicates that a part of Br$$_{3}^{-}$$ formed via the oxidation of Br$$^{-}$$ during charging does not oxidize Li$$_{2}$$O$$_{2}$$ as RM but gets accumulated in the cell. Consistent with this result, the O$$_{2}$$ evolution efficiency gradually decreases from the initial 100% as the charging progresses, and CO$$_{2}$$ is emitted at the end of the charging. All these results clearly show that the Br$$^{-}$$/Br$$_{3}^{-}$$ RM functions effectively at the beginning of charging but gradually loses its function as charging proceeds.

Accesses

:

- Accesses

InCites™

:

Percentile:31.35

Category:Chemistry, Physical

Altmetrics

:

[CLARIVATE ANALYTICS], [WEB OF SCIENCE], [HIGHLY CITED PAPER & CUP LOGO] and [HOT PAPER & FIRE LOGO] are trademarks of Clarivate Analytics, and/or its affiliated company or companies, and used herein by permission and/or license.