TY - JOUR
T1 - Electrochemical stability of glyme-based electrolytes for Li-O2batteries studied by
T2 - In situ infrared spectroscopy
AU - Horwitz, Gabriela
AU - Calvo, Ernesto J.
AU - Méndez De Leo, Lucila P.
AU - De La Llave, Ezequiel
N1 - Publisher Copyright:
© the Owner Societies.
PY - 2020/8/7
Y1 - 2020/8/7
N2 - In situ subtractively normalized Fourier transform infrared spectroscopy (SNIFTIRS) experiments were performed simultaneously with electrochemical experiments relevant to Li-air battery operation on gold electrodes in two glyme-based electrolytes: Diglyme (DG) and tetraglyme (TEGDME), tested under different operational conditions. The results show that TEGDME is intrinsically unstable and decomposes at potentials between 3.6 and 3.9 V vs. Li+/Li even in the absence of oxygen and lithium ions, while DG shows a better stability, and only decomposes at 4.0 V vs. Li+/Li in the presence of oxygen. The addition of water to the DG based electrolyte exacerbates its decomposition, probably due to the promotion of singlet oxygen formation.
AB - In situ subtractively normalized Fourier transform infrared spectroscopy (SNIFTIRS) experiments were performed simultaneously with electrochemical experiments relevant to Li-air battery operation on gold electrodes in two glyme-based electrolytes: Diglyme (DG) and tetraglyme (TEGDME), tested under different operational conditions. The results show that TEGDME is intrinsically unstable and decomposes at potentials between 3.6 and 3.9 V vs. Li+/Li even in the absence of oxygen and lithium ions, while DG shows a better stability, and only decomposes at 4.0 V vs. Li+/Li in the presence of oxygen. The addition of water to the DG based electrolyte exacerbates its decomposition, probably due to the promotion of singlet oxygen formation.
UR - http://www.scopus.com/inward/record.url?scp=85088881702&partnerID=8YFLogxK
U2 - 10.1039/d0cp02568b
DO - 10.1039/d0cp02568b
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C2 - 32671355
AN - SCOPUS:85088881702
SN - 1463-9076
VL - 22
SP - 16615
EP - 16623
JO - Physical Chemistry Chemical Physics
JF - Physical Chemistry Chemical Physics
IS - 29
ER -