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EDLC용 활성탄소 전극의 전기화학적 기계적 특성에 미치는 바인더의 영향
전민제,김익준,양선혜,문성인,김현수,오대희,Jeon, Min-Je,Kim, Ick-Jun,Yang, Sun-Hye,Moon, Seong-In,Kim, Hyun-Soo,Oh, Dae-Hee 한국전기전자재료학회 2006 전기전자재료학회논문지 Vol.19 No.12
This work describes the effect of binders, such as carboxymethylcellulose (CMC), CMC+ Polytetrafluoroethylene (PTFE) and PTFE, on the electrochemical and mechanical properties of activated carbon-electrode for electric double layer capacitor. The cell capacitors using the electrode bound with binary binder composed of CMC and PTFE, especially in composition CMC PTFE = 60 : 40 wt.%, has better rate capability and the lower internal resistance than those of the cell capacitor with CMC. On the other hand, the sheet type electrode kneaded with PTFE was bonded with conductive adhesive on Al foil. This cell capacitor using the electrode with PTFE exhibited the best mechanical properties and rate capability compared to the CMC and CMC+PTFE one. These behaviors could be explained by the well-developed network structure of PTFE fibrils doting the kneading process.
하이브리드 (활성탄소+LiCoO<sub>2</sub>) 전극의 전기화학적 특성
김익준,전민제,양선혜,김현수,문성인,오대희,Kim, Ick-Jun,Jeon, Min-Je,Yang, Sun-Hye,Kim, Hyun-Soo,Moon, Sung-In,Oh, Dae-Hee 한국전기전자재료학회 2006 전기전자재료학회논문지 Vol.19 No.9
In this study, the hybrid electrodes, composed of the activated carbon powders and $LiCoO_{2}$ powders, were prepared as a cathode for the high-capacitance type hybrid capacitor, and the electrochemical properties of the hybrid electrodes were examined in terms of the weight composition and the milling time of $LiCoO_{2}$ powders. The specific volumetric capacities were increased with increasing of the composition of $LiCoO_{2}$ powders in the hybrid electrodes. On the other hand the coin cell capacitors, using the hybrid electrodes with $LiCoO_{2}$ poweders milled for 200 h, have exhibited the lower internal resistivities and the better capacity retention after 100 charge-discharge cycle than those of the coin cell capacitors using the hybrid electrodes with raw $LiCoO_{2}$ powders.
양선혜,김익준,전민제,문성인,김현수,안계혁,이윤표,Yang, Sun-Hye,Kim, Ick-Jun,Jeon, Min-Je,Moon, Seong-In,Kim, Hyun-Soo,An, Kye-Hyeok,Lee, Yun-Pyo 한국전기전자재료학회 2007 전기전자재료학회논문지 Vol.20 No.6
The oxidation treatment of several carbon materials with a sodium chlorate and 70 wt.% of nitric acid, combined with heat treatment, were attempted to achieve an electrochemical active material with a larger capacitance. Among pitch, needle coke, calcinated needle coke and natural graphite, the structure of needle coke and calacinated needle coke were changed to the graphite oxide structure with the expansion of the inter-layer. On the other hand, the calcinated needle coke after oxidation and heating at $200^{\circ}C$ has exhibited largest capacitance per weight and volume of 29.5 F/g and 24.5 F/ml at the two-electrode system in the potential range of 0 to 2.5 V. The electrochemical performance of the calcinated needle coke was discussed with the phenomenon of the electric field activation and the formation of new pores between the expanded inter-layer at first charge.