Effects of Atmospheric Gases on Li Metal Cyclability and Solid-Electrolyte Interphase Formation.
ACS energy letters
American Chemical Society
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Wang, E., Dey, S., Liu, T., Menkin, S., & Grey, C. (2020). Effects of Atmospheric Gases on Li Metal Cyclability and Solid-Electrolyte Interphase Formation.. ACS energy letters, 5 (4), 1088-1094. https://doi.org/10.1021/acsenergylett.0c00257
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.
The authors thank EPSRC-EP/M009521/1 and the Cambridge Trust (E.W.) for research funding.
EPSRC (via University of Oxford) (EP/M009521/1)
External DOI: https://doi.org/10.1021/acsenergylett.0c00257
This record's URL: https://www.repository.cam.ac.uk/handle/1810/303778
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