Effects of Atmospheric Gases on Li Metal Cyclability and Solid-Electrolyte Interphase Formation.,ACS Energy Letters

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Effects of Atmospheric Gases on Li Metal Cyclability and Solid-Electrolyte Interphase Formation.
ACS Energy Letters ( IF 19.3 ) Pub Date : 2020-03-10 , DOI: 10.1021/acsenergylett.0c00257
Evelyna Wang ₁ , Sunita Dey ₁ , Tao Liu ₁ , Svetlana Menkin ₁ , Clare P Grey ₁

Affiliation

For Li-air batteries, dissolved gas can cross over from the air electrode to the Li metal anode and affect the solid-electrolyte interphase (SEI) formation, a phenomenon that has not been fully characterized. In this work, the impact of atmospheric gases on the SEI properties is studied using electrochemical methods and ex situ characterization techniques, including X-ray photoelectron spectroscopy, X-ray diffraction, Fourier transform infrared spectroscopy, and scanning electron microscopy. The presence of O2 significantly improved the lithium cyclability; less lithium is consumed to form the SEI or is lost because of electrical disconnects. However, the SEI resistivity and plating overpotentials increased. Lithium cycled in an "air-like" mixed O2/N2 environment also demonstrated improved cycling efficiency, suggesting that dissolved O2 participates in electrolyte reduction, forming a homogeneous SEI, even at low concentrations. The impact of gas environments on Li metal plating and SEI formation represents an additional parameter in designing future Li-metal batteries.

中文翻译：

大气对锂金属循环性和固体电解质界面形成的影响。

对于锂空气电池，溶解的气体会从空气电极穿过锂金属阳极，并影响固体电解质中间相（SEI）的形成，这种现象尚未得到充分表征。在这项工作中，使用电化学方法和非原位表征技术，包括X射线光电子能谱，X射线衍射，傅里叶变换红外光谱和扫描电子显微镜，研究了大气对SEI性能的影响。O 2的存在显着改善了锂的循环能力；更少的锂被消耗以形成SEI或由于电气断开而损失。但是，SEI电阻率和电镀超电势增加。在“类似空气”的O2 / N2混合环境中循环使用的锂也显示出更高的循环效率，这表明溶解的O2参与了电解质的还原，即使在低浓度下也能形成均匀的SEI。气体环境对锂金属电镀和SEI形成的影响代表了设计未来锂金属电池的另一个参数。

更新日期：2020-04-23

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