http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
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.
니들코크스의 전기이중층 거동에 미치는 산화처리/열처리 효과
양선혜,김익준,최인식,김현수,Yang, Sun-Hye,Kim, Ick-Jun,Choi, In-Sik,Kim, Hyun-Soo 한국전기화학회 2009 한국전기화학회지 Vol.12 No.1
In this study, a needle coke was oxidized in a mixture of dilute nitric acid and sodium chlorate ($NaClO_3$) solutions and followed by heat treatment. The samples were analyzed with using XRD, FESEM, elemental analyzer, BET, and Raman spectroscopy. Double layer capacitance was measured with the charge and discharge measurements. The consisting layers of the needle coke were expanded to single phase showing only (001) diffraction peak by the acid treatment for 24 hours. The oxidized coke returned to a graphite structure appearing (002) peak after heat treatment above $200^{\circ}C$. The structure returned could be more easily accessible to the ions by the first charge, and improve the double layer capacitance at the second charge. The two-electorde cell from acid treated coke and $300^{\circ}C$ heat treatment exhibited the maximum capacitances of 32.1 F/g and 29.5 F/ml at the potential of $0{\sim}2.5\;V$. 니들 코크스의 활성화를 위해 $HNO_3$와 $NaClO_3$ 혼합용액에서의 산처리와 열처리를 행하였다. 산화처리 코크스와 열처리한 코크스의 미세구조는 XRD, FESEM, elemental analysis, BET, Raman spectroscopy를 이용하였으며, 전기이중층 거동은 충방전 분석을 행하였다. 니들 코크스는 산화처리 시간에 따라 산소의 중량 %의 증가와 함께 층간이 분리되어(001) 구조로 상변화가 일어나고, $200^{\circ}C$ 이상의 열처리에서 흑연구조 특성인(002) 구조로 되돌아갔다. 이들 산화처리 과정에서 층간에 관능기가 도입 되어 구조결함이 발생하고 1차 충전에서 전계 활성화에 의해 층간을 확장되어 2차 충전에서 전기이중층 용량을 발생 시키는 것으로 보인다. 24시간 산화처리후 $300^{\circ}C$ 열처리한 코크스의 2.5 V까지의 2 전극 기준에서 구한 활물질 중량 당 용량과 전극 부피 당 용량은 각각 32.1 F/g과 29.5 F/ml을 나타내었다.
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.
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.
역류식 충진탑에서 수력학적인 분석과 이산화탄소의 탈착에 관한 연구
楊善惠,崔東勳,지혜미,金恩貞,金彰昊 동아대학교 환경문제연구소 1996 硏究報告 Vol.19 No.1
This study was carried out to interpret hydraulic behavior and CO₂gas desorption in countercurrent packing tower which packed 50 mm plastic Hiflow-ring. The results are as follows: 1. To compare with conventional packing, 50mm Hiflow-ring could save energy because of low pressure drop under high load. 2. As relative error between calculated value and investigated value was less than 6% in the loading point and flooding point we found that we can predict results mathematically which occurres in the packing tower. 3. The unique magnituteds of packing which was used are as follows. C_(L) = 2.1×10^(-4), n = 0.787 so we can predict efficency which occurres.