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

IF 3.1 3区化学 Q2 Chemistry Faraday Discussions Pub Date : 2023-10-16 DOI:10.1039/D3FD00092C

Aimin Ge, Ryuuta Nagai, Kota Nemoto, Bingbing Li, Koki Kannari, Ken-ichi Inoue and Shen Ye

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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.

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用原位振动光谱法研究了Li-O2电池阴极表面溶剂的稳定性。

在非质子锂氧（Li-O2）电池中，溶剂性质在充电/放电过程中至关重要。因此，深入了解氧还原/析氧反应（ORR/OER）过程中阴极表面的溶剂稳定性对于合理设计高性能电解质至关重要。在本研究中，通过和频生成（SFG）光谱和红外反射吸收光谱（IRRAS）的原位振动光谱测量，研究了典型溶剂（一系列具有不同链长的甘醇二甲醚溶剂）在ORR/OER过程中的稳定性。在此基础上讨论了ORR/OER过程中溶剂的结构演变和分解机理。我们的结果表明，在ORR过程中产生的超氧化物（O2-）对溶剂的稳定性起着关键作用。

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