화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Korean Chemical Engineering Research, Vol.60, No.2, 184-192, May, 2022
DOI10.9713/kcer.2022.60.2.184  Export Citation
리튬-황 전지용 프리스탠딩 플렉서블 S/CNT/NiO 전극의 제조 및 전기화학적 특성
Preparation and Electrochemical Properties of Freestanding Flexible S/CNT/NiO Electrodes for Li-S Batteries
신윤정, 이원열, 김태윤1, 문승근2, 김은미, 정상문†
  • 충북대학교 화학공학과, 28644 충북 청주시 서원구 충대로 1
  • 1에스엔피랩, 28116 충청북도 청주시 청원구 오창읍 성산질푼이길 12-47
  • 2성진코퍼레이션(주), 28184 충북 청주시 서원구 저산척북로 413
Yun Jung Shin, Won Yeol Lee, Tae Yun Kim1, Seung-Guen Moon2, En Mei Jin, and Sang Mun Jeong†
  • Department of Chemical Engineering, Chungbuk National University, 1 Chungdae-ro, Seowon-gu, Cheongju, Chungbuk, 28644, Korea
  • 1SNPLAB co. Ltd., 45, Yangcheong 4-gil, Ochang-eup, Cheongwon-gu, Cheongju-si, Chungbuk, 28116, Korea
  • 2Sungjin Corp., Ltd, 413 Jeosancheokbuk-ro, Sewon-gu, Cheongju, Chungbuk, 28184, Korea
E-mail:
초록
수열합성을 통해 합성한 다공성 NiO는 리튬 폴리설파이드의 용출을 억제하기 위하여 리튬-황 전지의 전극에 사용 되었다. 리튬-황 전지의 전극은 경제적이고 간단한 진공 여과 방법을 이용하여 집전체와 바인더가 없는 프리스탠딩 플 렉서블 전극으로 제작되었다. 다공성 NiO를 첨가한 S/CNT/NiO 전극은 순수 S/CNT 전극에 비해 125 mA h g-1 증가 한 877 mA h g-1 (0.2 C)의 초기 방전용량과 200 사이클 후 84% (S/CNT: 66%)의 우수한 용량 유지율을 나타내었다. 이는 방전 과정 중에서 NiO와 리튬 폴리설파이드의 강한 화학적 결합에 의하여 리튬 폴리설파이드의 전해질로 용출되는 것 을 억제하여 나타난 결과이다. 또한 S/CNT/NiO 전극의 유연성 테스트를 위해 1.6 × 4 cm2의 파우치셀로 제작하여 폴 딩한 상태와 하지 않은 상태에서 모두 620 mA h g-1의 안정적인 사이클 특성을 나타내었다.
Porous NiO synthesized via hydrothermal synthesis was used in the electrodes of lithium-sulfur batteries to inhibit the elution of lithium polysulfide. The electrode of the lithium-sulfur battery was manufactured as a freestanding flexible electrode using an economical and simple vacuum filtration method without a current collector and a binder. The porous NiO-added S/CNT/NiO electrode exhibited a high initial discharge capacity of 877 mA h g-1 (0.2 C), which was 125 mA h g-1 higher than that of S/CNT, and also showed excellent retention of 84% (S/CNT: 66%). This is the result of suppressing the dissolution of lithium polysulfide into the electrolyte by the strong chemical bond between NiO and lithium polysulfide during the charging and discharging process. In addition, for the flexibility test of the S/CNT/ NiO electrode, the 1.6 × 4 cm2 pouch cell was prepared and exhibited stable cycle characteristics of 620 mA h g-1 in both the unfolded and folded state.
Keywords:Lithium-sulfur batteries;NiO;Carbon nanotube;Freestanding flexible electrode;Vacuum filtration method;Dissolution of polysulfide
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