材料科学
傅里叶变换红外光谱
化学工程
电化学
红外线的
化学成分
电解质
电极
纳米尺度
同步加速器
原位
锂(药物)
水溶液
气体成分
分析化学(期刊)
纳米技术
环境化学
化学
物理化学
有机化学
工程类
内分泌学
物理
光学
热力学
医学
作者
Thayane Carpanedo de Morais Nepel,Chayene G. Anchieta,Letícia F. Cremasco,Bianca P. Sousa,André N. Miranda,Lorrane C. C. B. Oliveira,Bruno A. B. Francisco,Júlia P. O. Júlio,Francisco Maia,Raul O. Freitas,Cristiane B. Rodella,Rubens Maciel Filho,Gustavo Doubek
标识
DOI:10.1002/aenm.202101884
摘要
Abstract Metal–air batteries, such as Li–air, may be the key for large‐scale energy storage as they have the highest energy density among all electrochemical devices. However, these devices suffer from irreversible side reactions leading to battery failure, especially when ambient air is used as the O 2 source, so a deep understanding over the surface chemistry evolution is imperative for building better devices. Herein, a multi‐scale (nano‐micro) FTIR analysis is made over the electrode surface during cell discharge employing synchrotron infrared nanospectroscopy (SINS) for the first time, to track the chemical composition changes at the nanoscale which are successfully correlated with in operando micro‐FTIR characterization. The in situ results reveal homogeneous product distribution from the nano to the micro scale, and that the discharge rate does not interfere in chemical composition. In operando micro‐FTIR shows the atmosphere dependency over Li products formation; the presence of HCOO – species occurring due to CO 2 electroreduction in water, LiOH and Li 2 CO 3 , are also detected and even the lowest concentration of CO 2 and H 2 O affects the O 2 reactions. Finally, evidence of the Li 2 O 2 reaction with DMSO forming DMSO 2 after just 140 s of cell discharge shows this new technique's relevance in aiding the search for stable electrolytes.
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