The Polymer Society of Korea

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From HF Scavenging to Li-ion Transport Enhancement: Multifunctional Separator Enabling Stable Li Metal Batteries in Carbonate-based Electrolytes

남서하 (포항공과대학교)

박수진 (포항공과대학교)

남서하 (포항공과대학교), 박수진 (포항공과대학교)

Lithium metal batteries (LMBs) suffer from interfacial instability in carbonate-based electrolytes due to electrolyte decomposition at the Li metal anode. To address this issue, a multifunctional separator based on a siloxane-functionalized poly(aromatic amide) (APA-g-APT) is fabricated as a nanofiber mat by electrospinning. The uniformly distributed Si–OR groups scavenge HF, suppress parasitic reactions, and promote the formation of stable, inorganic-rich SEI and CEI layers on both electrodes. Upon HF scavenging, in situ formation of electronegative Si–F moieties enhances ionic conductivity and enables homogeneous Li-ion transport. Consequently, Li/NCM811 full cells with thin Li anodes (<40 µm) show stable cycling even in electrolytes containing 1000 ppm H₂O. When paired with high-loading cathodes, the APA-g-APT cell achieves a gravimetric energy density of up to 402.2 Wh kg⁻¹, providing a practical route toward safe, high-energy-density LMBs.

1PS-145

2026-04-09  09:00 - 10:30