Operando Nanobeam Diffraction to Follow the Decomposition of Individual Li2O2 Grains in a Nonaqueous Li–O2 Battery

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• 作者：Swapna Ganapathy ; Jouke R. Heringa ; Maria S. Anastasaki ; Brian D. Adams ; Martijn van Hulzen ; Shibabrata Basak ; Zhaolong Li ; Jonathan P. Wright ; Linda F. Nazar ; Niels H. van Dijk ; Marnix Wagemaker
• 刊名：The Journal of Physical Chemistry Letters
• 出版年：2016
• 出版时间：September 1, 2016
• 年：2016
• 卷：7
• 期：17
• 页码：3388-3394
• 全文大小：534K
• 年卷期：0
• ISSN：1948-7185

文摘

Intense interest in the Li–O₂ battery system over the past 5 years has led to a much better understanding of the various chemical processes involved in the functioning of this battery system. However, detailed decomposition of the nanostructured Li₂O₂ product, held at least partially responsible for the limited reversibility and poor rate performance, is hard to measure operando under realistic electrochemical conditions. Here, we report operando nanobeam X-ray diffraction experiments that enable monitoring of the decomposition of individual Li₂O₂ grains in a working Li–O₂ battery. Platelet-shaped crystallites with aspect ratios between 2.2 and 5.5 decompose preferentially via the more reactive (001) facets. The slow and concurrent decomposition of individual Li₂O₂ crystallites indicates that the Li₂O₂ decomposition rate limits the charge time of these Li–O₂ batteries, highlighting the importance of using redox mediators in solution to charge Li–O₂ batteries.