[2PS-173]
Fluorinated Elastomeric Protective Layers with Controlled Solvophobic Properties for Highly Stable Lithium Metal Batteries
발표자권승호 (KAIST)
연구책임자김범준 (KAIST)
Abstract
The interfacial instability and dendritic growth of lithium (Li) remain key obstacles to the implementation of Li metal batteries (LMBs). Herein, we present in-situ fabricated polymer protective layers (PPLs) on Li metal anode to enhance interfacial stability and electrochemical performance. The PPLs comprise a fluorinated elastomer and LLZTO fillers to tune mechanical integrity and ionic conductivity. Among them, hexafluorobutyl acrylate-based PPL (H-PPL) exhibits optimal solvophobicity with an ionic conductivity of 0.20 mS cm-1, stretchability of 300 %, and an adhesion strength of 5.1 N m-1, which suppresses electrolyte penetration and promotes uniform Li deposition. Consequently, full cells employing H-PPL-coated Li and NCM811 cathodes retain 87.8 % capacity after 250 cycles at 1C, outperforming bare Li (67.6 %). This study demonstrates that PPL with controlled solvophobicity leads to enhanced electrochemical performance of LMBs.