• Optimization of Curing PEGDA Quasi-solid-state Electrolytes for Lithium Metal Batteries

  • Seohye Jeon*, **, Boyun Jang*,† , and Daeil Kim*,†

  • *Energy Storage Department, Korea Institute of Energy Research, 152, Gajeong-ro, Yuseong-gu, Daejeon 34129, Korea
    **Department of Materials Science and Engineering, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Korea

  • 리튬 금속 전지를 위한 PEGDA 반고체 전해질의 경화 조건 최적화

  • 전서혜*, ** · 장보윤*,† · 김대일*,†

  • *한국에너지기술연구원 에너지저장연구단, **고려대학교 신소재공학과

  • Reproduction, stored in a retrieval system, or transmitted in any form of any part of this publication is permitted only by written permission from the Polymer Society of Korea.


Abstract

The influence of polymer content and curing conditions of PEGDA-based quasi-solid electrolytes on interfacial stability and cycling performance in lithium metal batteries were investigated. To assess the degree of polymerization, Fourier-transform infrared (FTIR) spectroscopy measurement was conducted, focusing on the consumption of acrylate functional groups. Electrochemical impedance spectroscopy, linear sweep voltammetry, and critical current density tests were used to evaluate ionic conductivity, electrochemical stability, and lithium plating/stripping behavior. In addition, high-loading NCM811 (LiNi0.8Co0.1Mn0.1O2)/Li metal cells were assembled to examine cycling performance under practical conditions. Among various compositions, the electrolyte containing 4 wt% PEGDA cured at 50-60 ℃ exhibited the highest capacity retention and electrochemical stability. These results highlight that the optimized processing conditions significantly enhance the performance and reliability of quasi-solid-state lithium metal batteries.


본 연구는 리튬 금속 음극의 계면 불안정성과 수명 저하 문제를 해결하기 위해, poly(ethylene glycol) diacrylate (PEGDA) 기반 반고체 전해질의 고분자 함량 및 경화 조건이 전해질 특성과 전지 성능에 미치는 영향을 분석하였다. Fourier-transform infrared (FTIR) 분석을 통해 겔화 진행도를 평가하였으며, 전기화학 측정과 고로딩 NCM811 (LiNi0.8Co0.1Mn0.1O2)양극 적용 전지를 이용한 충·방전 실험 결과, 4 wt% PEGDA 조성 및 50-60 ℃의 경화 조건에서 가장 우수한 용량 유지율과 전기화학적 안정성이 나타났다.


Keywords: quasi-solid state battery, gel-polymer electrolyte, Fourier-transform infrared.

  • Polymer(Korea) 폴리머
  • Frequency : Bimonthly(odd)
    ISSN 2234-8077(Online)
    Abbr. Polym. Korea
  • 2024 Impact Factor : 0.6
  • Indexed in SCIE

This Article

  • 2026; 50(1): 108-113

    Published online Jan 25, 2026

  • 10.7317/pk.2026.50.1.108
  • Received on Jul 18, 2025
  • Revised on Sep 4, 2025
  • Accepted on Sep 18, 2025

Correspondence to

  • Boyun Jang* , and Daeil Kim*

  • Energy Storage Department, Korea Institute of Energy Research, 152, Gajeong-ro, Yuseong-gu, Daejeon 34129, Korea

  • E-mail: byjang@kier.re.kr, daeilkim@kier.re.kr