Stability
of Glyme Solvate Ionic Liquid as an Electrolyte for Rechargeable Li−O2 Batteries
Version 2 2017-10-19, 00:48
Version 1 2017-02-07, 12:19
Posted on 2017-10-19 - 00:48
A solvate
ionic liquid (SIL) was compared with a conventional organic solvent
for the electrolyte of the Li–O2 battery. An equimolar
mixture of triglyme (G3) and lithium bis(trifluoromethanesulfonyl)amide
(Li[TFSA]), and a G3/Li[TFSA] mixture containing excess glyme were
chosen as the SIL and the conventional electrolyte, respectively.
Charge behavior and accompanying gas evolution of the two electrolytes
was investigated by electrochemical mass spectrometry (ECMS). From
the linear sweep voltammetry performed on an as-prepared cell, we
demonstrate that the SIL has a higher oxidative stability than the
conventional electrolyte and, furthermore, offers the advantage of
lower volatility, which would benefit an open-type lithium-O2 cell design. Moreover, CO2 evolution during galvanostatic
charge was less in the SIL, which implies less side reaction. However,
O2 evolution during charge did not reach the theoretical
value in either of the two electrolytes. Several mass spectral fragments
were generated during the charge process, which provided evidence
for side reactions of glyme-based electrolytes. We further relate
the difference in observed discharge product morphology for these
electrolytes to the solubility of the superoxide intermediate, determined
by rotating ring disk electrode (RRDE) measurements.
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Kwon, Hoi-Min; Thomas, Morgan L.; Tatara, Ryoichi; Oda, Yoshiki; Kobayashi, Yuki; Nakanishi, Azusa; et al. (2017). Stability
of Glyme Solvate Ionic Liquid as an Electrolyte for Rechargeable Li−O2 Batteries. ACS Publications. Collection. https://doi.org/10.1021/acsami.6b14449
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AUTHORS (9)
HK
Hoi-Min Kwon
MT
Morgan L. Thomas
RT
Ryoichi Tatara
YO
Yoshiki Oda
YK
Yuki Kobayashi
AN
Azusa Nakanishi
KU
Kazuhide Ueno
KD
Kaoru Dokko
MW
Masayoshi Watanabe
KEYWORDS
SILcharge processsweep voltammetryCO 2 evolutiondischarge product morphologycharge behaviorgalvanostatic chargeside reactionside reactionsoxidative stabilityring disk electrodeas-prepared cellequimolar mixtureSeveral massRRDEopen-type lithium-O 2 cell designO 2 evolutionLielectrochemical mass spectrometryGlyme Solvateglyme-based electrolytesgas evolutionECMS