Applied Chemistry for Engineering (공업화학)

The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
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Gel Polymer Electrolytes Derived from a Polysilsesquioxane Crosslinker for Lithium-Sulfur Batteries

리튬-황 전지용 폴리실세스키옥산 고분자 가교제로 제조된 겔 고분자 전해질의 전기화학적 특성

  • Kim, Eunji (School of Chemical Engineering, Pusan National University) ;
  • Lee, Albert S. (Materials Architecturing Research Center, Korea Institute of Science and Technology) ;
  • Lee, Jin Hong (School of Chemical Engineering, Pusan National University)
  • 김은지 (부산대학교 공과대학 응용화학공학부) ;
  • 이성수 (한국과학기술연구원 물질구조제어연구센터) ;
  • 이진홍 (부산대학교 공과대학 응용화학공학부)
  • Received : 2021.07.13
  • Accepted : 2021.07.19
  • Published : 2021.08.10
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Abstract

A ladder-like polysilsesquioxane (LPMA64) functionalized with a crosslinkable group was synthesized and used for the preparation of organic-inorganic hybrid gel polymer electrolytes through a thermal crosslinking process of the liquid electrolytes. A small weight percent of LPMA64 polymer crosslinker (5 wt%) was able to form a well-developed network structure, resulting in good dimensional stability with high ionic conductivity. The lithium-sulfur batteries fabricated with organic-inorganic hybrid gel polymer electrolytes exhibited stable C-rate and cycling performance with excellent Coulombic efficiency due to the alleviated lithium polysulfide shuttling effect during prolonged cycling. The result demonstrates that the organic-inorganic hybrid gel polymer electrolytes could be a promising candidate electrolyte for application in lithium-sulfur batteries.

본 연구에서는 가교성 작용기가 기능화된 사다리형 폴리실세스키옥산(LPMA64)을 합성하였고, 이를 액상 전해질의 열 가교 공정에 활용하여 유기-무기 하이브리드 겔 고분자 전해질을 제조하였다. 5 wt%의 낮은 LPMA64 고분자 가교제 함량으로도 전해질 내 네트워크 구조가 잘 발달하여, 우수한 형태 안정성과 높은 이온 전도도를 가지는 전해질의 제조가 가능하였다. 하이브리드 겔 고분자 전해질이 적용된 리튬-황 전지는 안정적인 율속과 장수명 성능 및 높은 쿨롱 효율을 나타냈으며, 이는 완화된 리튬 폴리설파이드 셔틀 현상에 기인했다. 본 연구결과는 제조된 유기-무기 하이브리드 겔 고분자 전해질이 리튬-황 전지 응용에 유망한 전해질임을 보여주었다.

Keywords

Acknowledgement

본 연구는 정부(과학기술정보통신부)의 재원으로 한국연구재단의 지원(2019R1G1A110012213)과 2018학년도 부산대학교 신임교수연구 정착금 지원으로 이루어졌음

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