Understanding solid electrolyte interface formation on graphite and silicon anodes in lithium-ion batteries: Exploring the role of fluoroethylene carbonate

• Published in: Electrochemistry communications 2024-06, Vol.163, p.107708, Article 107708
• Main Authors: Lee, Jinhee, Jeong, Ji-Yoon, Ha, Jaeyun, Kim, Yong-Tae, Choi, Jinsub
• Format: Article
• Language: English
• Subjects: Dicarboxylate; Electrolyte decomposition; Fluoroethylene carbonate; Lithium-ion battery; Solid electrolyte interface layer
• ISSN: 1388-2481; 1873-1902
• DOI: 10.1016/j.elecom.2024.107708

[Display omitted] •FEC builds SEI layer with Li2CO3 and LiF on electrode, whether graphite or silicon.•The durable SEI layer enhances capacity and effectively reduces volume expansion.•FEC prevents the chemical conversion and reductive decomposition of electrolyte.•FEC inhibits dicarboxylate formation, thereby preserving electrolyte performance. This study explores how fluoroethylene carbonate (FEC) influences the solid electrolyte interface (SEI) layer formation during battery cycling process. FEC improves SEI properties, producing a uniform, chemically stable layer enriched with lithium fluoride. This enhances mechanical resilience and electrochemical stability. FEC also suppresses electrolyte deformation and decomposition, maintaining its initial state. The findings highlight the significance and comprehension of electrolyte additives, offering an electrolyte research pathway for improving Li-ion battery performance and durability.