期刊
ACS APPLIED MATERIALS & INTERFACES
卷 12, 期 23, 页码 26607-26613出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c04282
关键词
lithium metal anode; CO2 gas; surface reaction mechanism; ambient pressure XPS; oxalate intermediate; O-2-induced reaction bypass
资金
- Basque Government [PRE_2018_2_0285]
- ALS
- DOE Office of Science User Facility [DE-AC02-05CH11231]
- Energy Biosciences Institute through the EBI-Shell program
- China Scholarship Council (CSC) [201706340112]
- Early Career Award in the Condensed Phase and Interfacial Molecular Science Program in the Chemical Sciences Geosciences and Biosciences Division of the Office of Basic Energy Sciences of the U.S. Department of Energy [DE-AC02-05CH11231]
Because they deliver outstanding energy density, next-generation lithium metal batteries (LMBs) are essential to the advancement of both electric mobility and portable electronic devices. However, the high reactivity of metallic lithium surfaces leads to the low electrochemical performance of many secondary batteries. Besides, Li deposition is not uniform, which has been attributed to the low ionic conductivity of the anode surface. In particular, lithium exposure to CO2 gas is considered detrimental due to the formation of carbonate on the solid electrolyte interphase (SEI). In this work, we explored the interaction of Li metal with CO2 gas as a function of time using ambient pressure X-ray photoelectron spectroscopy to clarify the reaction pathway and main intermediates involved in the process during which oxalate formation has been detected. Furthermore, when O-2 gas is part of the surrounding environment with CO2 gas, the reaction pathway is bypassed to directly promote carbonate as a single product.
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