Applied Chemistry for Engineering (공업화학)

The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
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Cross-linkable Waterborne Polyurethane based on Castor Oil as an Efficient Binder for Silicon Anodes

실리콘 음극용 효과적인 바인더로서 가교결합이 가능한 캐스터 오일 기반의 수분산 폴리우레탄

  • Lee, Yong Hun (School of Chemical Engineering, Pusan National University) ;
  • Kim, Eunji (School of Chemical Engineering, Pusan National University) ;
  • Lee, Jin Hong (School of Chemical Engineering, Pusan National University)
  • 이용훈 (부산대학교 공과대학 응용화학공학부) ;
  • 김은지 (부산대학교 공과대학 응용화학공학부) ;
  • 이진홍 (부산대학교 공과대학 응용화학공학부)
  • Received : 2021.09.27
  • Accepted : 2021.10.10
  • Published : 2021.12.10
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Abstract

Silicon (Si) is one of the promising active materials to replace the widely used graphite because of its low electrochemical potential and high theoretical capacity. However, Si anodes still face in problems with the huge volume expansion and continuous decomposition of the electrolyte during repeated charge and discharge processes. To address these issues, a cross-linkable waterborne polyurethane (CWPU) based on a bio-oil, castor oil, was prepared and reacted with Tris(2,3-epoxypropyl) isocyanurate (TGIC) linkers, resulting in the formation of a mechanically robust 3D network structure. Si anodes fabricated with the CWPU-TGIC exhibited stable cycling performances and excellent discharge capacities. The results revealed that the CWPU-TGIC binder efficiently accommodates the large volume change for Si anode during charge and discharge cycles. Overall, the eco-friendly binder shows great promise in improving the electrochemical performances of Si anodes.

실리콘(Si) 활물질은 낮은 전위와 높은 에너지 밀도를 가지고 있어 현재 활용되고 있는 흑연을 대체할 수 있는 소재로 기대되고 있다. 그러나 반복적인 충, 방전 과정 중 부피 팽창으로 인한 실리콘 입자의 붕괴와 지속적인 전해질 분해 반응이 문제점으로 지적되고 있다. 이와 같은 문제를 해결하기 위해 본 연구에서는 실리콘 음극에 대한 효과적인 바인더로서 가교 결합이 가능한 Castor oil 기반의 수분산 폴리우레탄을 제조하였으며(CWPU), 이를 다량의 Oxirane 작용기를 가진 Tris(2,3-epoxypropyl) isocyanurate (TGIC)와 결합시켜 기계적으로 안정한 3차원 네트워크 구조를 형성하였다. CWPU-TGIC 바인더로 제조된 실리콘 음극은 안정적인 장기 수명 특성뿐만 아니라 우수한 방전 용량을 나타내었다. 이러한 결과는 CWPU-TGIC 바인더가 장기간 반복되는 충, 방전 과정 동안 실리콘 음극의 큰 부피 변화를 효과적으로 완화하는 것으로 분석되었다. 본 연구 결과는 실리콘 음극의 전기화학적 특성을 향상시키기 위한 효과적인 친환경 바인더의 가능성을 제시한다.

Keywords

Acknowledgement

본 연구는 부산대학교 기본연구지원사업(2년) 연구비와 2020학년도 부산대학교 BK21 FOUR 대학원혁신지원사업 지원으로 이루어졌음

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