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One-step Electrochemical Preparation of V2O5/Polypyrrole Composite Films Electrode

등록일
2009년 2월 2일 16시 31분 20초
접수번호
0014
발표코드
38P270포 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
발표시간
금 <발표Ⅲ>
발표형식
포스터
발표분야
전기화학
저자 및
공동저자
김유나, 김주성1, 조원일2, 모선일
아주대학교 에너지시스템학부, Korea
1아주대학교 화학과, Korea
2한국과학기술연구원 에너지환경연구부, Korea
The composites of conducting polymer and layer-structured metal oxide are of great interest as cathode materials for the rechargeable Li batteries. Polypyrrole(PPy) of high conductivity and two-dimensional V2O5 composites can offer larger capacities because of the large surface accessibility and the shorter Li+ diffusion lengths. In this work, V2O5 and polypyrrole composite (PPy/V2O5) film was grown by a one-step electrochemical polymerization method, simply applying anodic potential of +2.0 V at a stainless steel gauze electrode in a solution containing pyrrole monomer and well dispersed V2O5particles. The crystal structure, the composition, and the morphologies of the V2O5/PPy composites were examined by a X-ray diffractometer, a FT-IR spectrophotometer, a thermal gravity analyser and a scanning electron microscopy. Electrochemical performance of the V2O5/PPy composite electrodes was tested by assembling coin-type (CR2032) cells with a battery test system (Maccor series 4000). The cell was assembled in a dry room and cycled galvanostatically on a multichannel battery test mode. The initial discharge capacity above 250 mAhg-1 in the voltage range of 1.5-4.0 V. The intercalation capacity and discharge/charge rate of the V2O5/PPy composite film cathode are considerably better than V2O5-only electrodes.

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