@article{34933, author = {Emma J Hopkins and Sarah Frisco and Ryan T Pekarek and Caleb Stetson and Zoey Huey and Steven Harvey and Xiang Li and Baris Key and Chen Fang and Gao Liu and Guang Yang and Glenn Teeter and Nathan R Neale and Gabriel M Veith}, title = {Examining CO₂ as an Additive for Solid Electrolyte Interphase Formation on Silicon Anodes}, abstract = {

We demonstrate that the addition of CO₂ to a standard 1.0 M LiPF₆ 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 CO₂ result in a thicker insoluble SEI layer containing more organic constituents. The CO₂ 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 CO₂ addition provides an improved cycling performance through the reduction of irreversible side reactions, leading to higher coulombic efficiency. The results indicate that CO₂ incorporates into the SEI and plays a role similar to additives like fluorinated ethylene carbonate and vinylene carbonate with respect to polymeric components.

}, year = {2021}, journal = {Journal of The Electrochemical Society}, volume = {168}, pages = {030534}, month = {01/2021}, issn = {0013-4651}, doi = {10.1149/1945-7111/abec66}, language = {eng}, }