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DOE OSTI · 1772862

Examining CO 2 as an Additive for Solid Electrolyte Interphase Formation on Silicon Anodes

Hopkins, Emma·Frisco, Sarah·Pekarek, Ryan·Stetson, Caleb·Huey, Zoey·Harvey, Steven·Li, Xiang·Key, Baris·Fang, Chen·Liu, Gao·Yang, Guang·Teeter, Glenn·Neale, Nathan·Veith, Gabriel
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Abstract

In this study, we demonstrate that the addition of CO 2 to a standard 1.0 M LiPF 6 3:7 wt% ethylene carbonate:ethyl methyl carbonate electrolyte results in the formation of a thinner insoluble solid electrolyte interphase (SEI) that is dominated by the presence of LiF. In contrast, cells without CO 2 result in a thicker insoluble SEI layer containing more organic constituents. The CO 2 is incorporated in the dimethyl carbonate soluble part of the SEI composed primarily of polymeric poly(ethylene oxide) (PEO) on the surface of a thin inorganic layer. This combination of properties from CO 2 addition provides an improved cycling performance through the reduction of irreversible side reactions, leading to higher coulombic efficiency. The results indicate that CO 2 incorporates into the SEI and plays a role similar to additives like fluorinated ethylene carbonate and vinylene carbonate with respect to polymeric components.

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRYCO2Interface modificationSiliconXPS measurementsanodecarbon dioxideelectrolyte additivefluorinated ethylene carbonateinsoluble solid electrolyte interphasethin inorganic layervinylene carbonate

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Hopkins, Emma, Frisco, Sarah, Pekarek, Ryan, Stetson, Caleb, Huey, Zoey, Harvey, Steven, Li, Xiang, Key, Baris, Fang, Chen, Liu, Gao, Yang, Guang, Teeter, Glenn, Neale, Nathan, Veith, Gabriel. 2021-03-18. Examining CO 2 as an Additive for Solid Electrolyte Interphase Formation on Silicon Anodes. https://doi.org/10.1149/1945-7111%2Fabec66

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