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제109회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Improved Electrochemical Performance of Nanocrystalline-Conductive Polymer Composite Cathodes

2012년 2월 1일 14시 00분 29초
ELEC1-2 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
목 10시 : 05분
전기화학 - Advances in electrochemistry
저자 및
아주대학교 에너지시스템학부 화학, Korea
Composites composed of the nanosized electroactive inorganic crystal and conductive polymer are of great importance for rechargeable lithium ion batteries and are expected to exhibit synergistic effect for intercalation/deintercalation of lithium ions by the contribution from the durable inorganic crystals and flexible organic polymers. The composites as the cathodes for the rechargeable batteries could offer large capacity because of large surface area, easier lithium ion accessibility, mechanical flexibility, and improved conductivity. Nanodimensional crystals of V2O5 and LiFePO4 were prepared by hydrothermal methods. Then, the crystals are imbedded into various composites electrochemically or chemically (V2O5/PANi, V2O5/PPy, V2O5/PEDOT, or LiFePO4/PEDOT) by incorporating conducting polymers. The electrochemical performance of the composite cathodes with an assembled coin-type (CR2032) Li cell was tested with a battery test system (Maccor 4000). Excellent stability of the V2O5/PEDOT and V2O5 /PPy composite film cathodes under the repeated charge/discharge cycling was observed with almost no fading for various amount of V2O5 loading. For LiFePO4/PEDOT composites, maximum theoretical capacity was obtained. The capacity retention was also excellent even at high 10C rate. Enhanced diffusion and increased accessibility of Li+ caused by the incorporation of conducting polymers in the composites result in the cycling stability of the rechargeable lithium ion battery. High capacities in addition to the cycle stability were achieved with the composite cathodes. The methods and explanations will be discussed in detail.