Unraveling the solvent stability on the cathode surface of Li–O 2 batteries by using in situ vibrational spectroscopies

In aprotic lithium–oxygen (Li–O 2 ) batteries, solvent properties are crucial in the charge/discharge processes. Therefore, a thorough understanding of the solvent stability at the cathode surface during the oxygen reduction/evolution reactions (ORR/OER) is essential for the rational design of high-...

Full description

Saved in:
Bibliographic Details
Published inFaraday discussions Vol. 248; pp. 119 - 133
Main Authors Ge, Aimin, Nagai, Ryuuta, Nemoto, Kota, Li, Bingbing, Kannari, Koki, Inoue, Ken-ichi, Ye, Shen
Format Journal Article
LanguageEnglish
Published England 29.01.2024
Online AccessGet full text

Cover

More Information
Summary:In aprotic lithium–oxygen (Li–O 2 ) batteries, solvent properties are crucial in the charge/discharge processes. Therefore, a thorough understanding of the solvent stability at the cathode surface during the oxygen reduction/evolution reactions (ORR/OER) is essential for the rational design of high-performance electrolytes. In this study, the stability of typical solvents, a series of glyme solvents with different chain lengths, has been investigated during the ORR/OER by in situ vibrational spectroscopy measurements of sum frequency generation (SFG) spectroscopy and infrared reflection absorption spectroscopy (IRRAS). The structural evolution and decomposition mechanism of the solvents during ORR/OER have been discussed based on the observations. Our results demonstrate that superoxide (O 2 − ) generated during the ORR plays a critical role in the stability of the solvents.
ISSN:1359-6640
1364-5498
DOI:10.1039/D3FD00092C