Volume 248, 2024
From the journal:

Faraday Discussions

Unraveling the solvent stability on the cathode surface of Li–O2 batteries by using in situ vibrational spectroscopies

Aimin Ge, ORCID logo †a   Ryuuta Nagai,†b   Kota Nemoto,b   Bingbing Li, ORCID logo b   Koki Kannari,b   Ken-ichi Inoue ORCID logo b  and  Shen Ye ORCID logo *b  

* Corresponding authors

a Center for Advanced Low-dimension Materials, Donghua University, Shanghai 201620, P. R. China

b Department of Chemistry, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan
E-mail: ye.shen@tohoku.ac.jp

Abstract

In aprotic lithium–oxygen (Li–O2) 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 (O2−) generated during the ORR plays a critical role in the stability of the solvents.

Graphical abstract: Unraveling the solvent stability on the cathode surface of Li–O2 batteries by using in situ vibrational spectroscopies

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Article information

DOI
https://doi.org/10.1039/D3FD00092C
Article type
Paper
Submitted
09 May 2023
Accepted
18 May 2023
First published
16 Oct 2023
This article is Open Access
Creative Commons BY-NC license

Faraday Discuss., 2024,248, 119-133

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Unraveling the solvent stability on the cathode surface of Li–O2 batteries by using in situ vibrational spectroscopies

A. Ge, R. Nagai, K. Nemoto, B. Li, K. Kannari, K. Inoue and S. Ye, Faraday Discuss., 2024, 248, 119 DOI: 10.1039/D3FD00092C

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