Multi-Functional Acrylate-Based Gel Polymer Electrolyte for Stable Anion-Derived SEI Formation in High-Energy Lithium Metal Batteries

作者：Chae-young Kim, Myung-Keun Oh, Hui-Tae Sim, J. Cho, Seong-Ho Kang, Yun-Sun Cho, S. Park, Dong-Won Kim · 发表于：ECS Meeting Abstracts · 年份：2025 · DOI：10.1149/ma2025-02663072mtgabs

With the rapid advancement of energy storage technologies and the widespread adoption of electric vehicles (EVs), the demand for high-energy-density rechargeable batteries is growing exponentially. Lithium metal batteries (LMBs) have emerged as promising candidates for next-generation energy storage due to their high specific energy, exceeding 350 Wh kg⁻¹. However, conventional LMBs employing liquid electrolytes suffer from limited cycle life and poor safety, primarily due to non-uniform lithium deposition and dendritic lithium growth. Therefore, constructing a robust and stable solid electrolyte interphase (SEI) is crucial to suppress parasitic side reactions and inhibit dendrite formation. Gel polymer electrolytes (GPEs) have gained attention as an effective strategy, as they can modulate the Li⁺ solvation sheath through interactions with functional groups in the polymer matrix, facilitating the formation of a stable, anion-derived, inorganic-rich SEI. In this study, a multifunctional acrylate crosslinker-based GPE was designed to regulate the Li⁺ solvation environment and promote the formation of a stable SEI. Fourier-transform infrared (FT-IR), Raman, and nuclear magnetic resonance (NMR) spectroscopy revealed a more aggregated solvation configuration of Li⁺ in the GPE. This optimized solvation structure leads to enhanced lithium plating morphology and stable SEI formation, as confirmed by scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). Furth...