Journal of the Korean Electrochemical Society (전기화학회지)

The Korean Electrochemical Society (한국전기화학회)
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Electrochemical Properties of Carbon/Manganese Oxide Composite Air Cathode for Lithium-Air Batteries

리튬-공기전지용 탄소/망간산화물 복합구조 공기극의 전기화학적 특성

  • Lee, Sun-Young (Center for Energy Convergence Research, Korea Institute of Science and Technology) ;
  • Cha, Eun-Hee (Department of Chemistry, Hoseo University) ;
  • Mho, Sun-Il (Division of Energy System Research, Ajou University) ;
  • Ju, Jeh-Beck (Department of Chemical Engineering, Hongik University) ;
  • Cho, Won-Il (Center for Energy Convergence Research, Korea Institute of Science and Technology)
  • 이선영 (한국과학기술연구원 에너지융합연구단) ;
  • 차은희 (호서대학교 화학과) ;
  • 모선일 (아주대학교 에너지시스템학부) ;
  • 주재백 (홍익대하교 화학공학과) ;
  • 조원일 (한국과학기술연구원 에너지융합연구단)
  • Received : 2012.08.20
  • Accepted : 2012.08.30
  • Published : 2012.08.31
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Abstract

Carbon-supported manganese oxide composite were fabricated as an air cathode material for Li-air batteries by hydrothermal method. The composite materials of carbon and manganese oxide were investigated by the implementation of X-ray diffraction, FE-SEM and BET surface area measurer. The manganese oxide synthesized at $170^{\circ}C$ for 12 h has a rod like shape morphology with 40-50 nm long in size. A Lithium-air battery with coin type, of which electrodes are composed of cathode composite materials synthesized $170^{\circ}C$-12 h and lithium metal anode, reveals its first discharge capacity of 3,852 mAh/g and four discharge-charge cycles.

리튬-공기전지 공기극으로서 탄소 상에 직접 수열합성법으로 망간산화물을 생성한 탄소지지 망간산화물 촉매를 합성하였다. 각 수열합성 조건에 따라서 만들어진 복합체에 대한 XRD, FE-SEM 분석을 통하여, 복합체의 결정구조, 형태, 크기 등을 확인하였는데 특히, 수열합성 온도 및 시간이 각각 $170^{\circ}C$, 12시간인 조건에서 만들어진 산화망간은 길이가 40-50 nm인 막대 모양을 갖는 것으로 나타났다. 합성된 복합체를 사용하여 만든 공기극과 리튬금속을 음극으로 하는 코인셀 형태의 리튬-공기전지를 만들어 전기화학적 특성을 조사한 결과 초기 방전 용량이 3,852 mAh/g으로 높았고 충 방전 횟수가 4회 정도 발현되었다.

Keywords

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