期刊
ACS ENERGY LETTERS
卷 5, 期 4, 页码 1088-1094出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.0c00257
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类别
资金
- Cambridge Trust
- UCL [PR16195]
- [EPSRC-EP/M009521/1]
- EPSRC [EP/M009521/1] Funding Source: UKRI
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 O-2 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 O-2/N-2 environment also demonstrated improved cycling efficiency, suggesting that dissolved O-2 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.
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