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RISS 인기검색어
- 검색키워드
- 저자 : Jae-Beck Ju (검색결과 5 건)
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유체가 흐르는 원통형 관내의 최적 전기도금을 위한 전류분포의 예측
朱宰伯,鄭在益 弘益大學校 科學技術硏究所 1996 科學技術硏究論文集 Vol.7 No.1
The methmatical model of the tertiary current distribution for the optimum conditions of electroplating inside a cylindrical tube with fluid flows, was stuied. With the assumption of fully developed flow, in the diffusion layer region the steady state equation of laminar convective diffusion was used, in the bulk region the Laplace's equation in cylindrical coordinates was used. The optimum condition of electroplating considered parameters that decide current distribution, was predicted.
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단일 충돌 분사법을 이용한 고속 전기도금 시스템의 반응특성 연구
朱宰伯,鄭在益 弘益大學校 科學技術硏究所 1997 科學技術硏究論文集 Vol.8 No.-
For an unsubmerged impinging slot-jet electroplating system, a theoretical model of the current and potential distribution was developed. It was found that hydrodynamic conditions exert a strong effect on performance at high current densities since flow influences mass transfer and also the shape of the free surface that confines the potential field. The capability of achieving selective reaction in the impingement region was found to improve with increased current density and flow rate. Dimensionless criteria for the upper limit of such improvements were established. Also the value of dimensionless parameters to represent the physical characteristics of the system gave significant effects for the determination of electroplating characteristics such as uniformity and selectivity of plating layer.
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Influence of Carbon Black as a Conductor on Electrode Characteristics for Lithium Secondary Battery
Yoon, Se-Rah,Lee, Joong-Kee,Ju, Jae-Beck,Cho, Byung-Won,Park, Dal-Keun 한국탄소학회 2002 Carbon Letters Vol.3 No.1
The electrochemical behavior of the $LiCoO_2$ electrode, containing carbon black as a conductor, depends upon the nature and characteristics of carbon black. In this study, six different kinds of carbon blacks were employed to investigate the relationship between the properties of carbon blacks and electrochemical characteristics of the electrode. The larger amount of surface oxygen functional groups brought the lower electrical conductivity for the carbon blacks. The electrical conductivity of carbon blacks was closely related to the impurities such as ash and volatile content. The rate capability and cyclability of the electrode were improved with the higher conductivity of carbon blacks used. So, it can be concluded that high conductive carbon black plays an important role as a conductor for high rate of charge-discharge capability and initial efficiency.
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Influence of Carbon Black as a Conductor on Electrode Characteristics for Lithium Secondary Battery
Se-Rah Yoon,Joong-Kee Lee,Jae-Beck Ju,Byung-Won Cho,Dal-Keun Park 한국탄소학회 2002 Carbon Letters Vol.3 No.1
The electrochemical behavior of the LiCoO2 electrode, containing carbon black as a conductor, depends upon the nature and characteristics of carbon black. In this study, six different kinds of carbon blacks were employed to investigate the relationship between the properties of carbon blacks and electrochemical characteristics of the electrode. The larger amount of surface oxygen functional groups brought the lower electrical conductivity for the carbon blacks. The electrical conductivity of carbon blacks was closely related to the impurities such as ash and volatile content. The rate capability and cyclability of the electrode were improved with the higher conductivity of carbon blacks used. So, it can be concluded that high conductive carbon black plays an important role as a conductor for high rate of charge-discharge capability and initial efficiency.
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메탄 플라즈마 분해에 의해 제조된 카본블랙 도전재의 전기화학적 특성에 대한 연구
윤세라,이중기,조원일,백영순,주재백,조병원,Yoon, Se-Rah,Lee, Joong-Kee,Cho, Won-Ihl,Baek, Young-Soon,Ju, Jae-Beck,Cho, Byung-Won 한국전기화학회 2003 한국전기화학회지 Vol.6 No.1
메탄의 플라즈마 열분해 방법에 의해 제조된 카본블랙을 $2\times10^{-2}torr$진공상태에서 $800,\;1300,\;2100^{\circ}C$의 온도로 열처리하여 원시료를 포함하여 물리적$\cdot$화학적 특성이 다른 4개의 시료를 준비하였다. 이 시료들을 리튬이차전지 양극 활물질인 $LiCoO_2$의 도전재로 사용하여 $Li/LiCoO_2$ 반쪽전지를 구성하고 변화된 도전재의 특성에 따른 셀의 전기화학적 특성 차이를 조사하였다 시료를 열처리하였을 때 표면화학그룹이 제거되고 전도도가 높아지면서 도전재로 사용하였을 때 사이클 특성 및 초기 방전용량이 향상되었다. 그러나, $2100^{\circ}C$에서 열처리한 시료를 도전재로 사용한 경우에는 사이클 특성 및 rate capability가 저하되는 것으로 나타났다. 이것은 플라즈마 블랙의 열처리에 의한 구조 변화에 따른 전극 내 분산 특성의 변화가 전도도 특성과 복합적으로 작용하여 제작한 셀의 전기화학적 특성에 영향을 미치기 때문으로 사료된다 열처리 온도가 높아질수록 카본블랙 표면의 관능기가 제거되면서 플라즈마 블랙의 전도도가 증가하였으나, 흑연화의 진행으로 나타난 agglomeration의 증가가 전극 내 분산 특성을 저하시키는 것으로 사료된다 그 결과 $800^{\circ}C$에서 열처리한 시료의 사이클 특성이 가장 우수하였다. Plasma carbon black(PB) which prepared by plasma pyrolysis of methane was treated at 800, 1300 and $2100^{\circ}C$ under $2\times10^{-2}$ torr. Four different samples including raw PB were added to $LiCoO_2$, cathode active material of lithium secondary battery, to investigate effects of properties of plasma black as conductors on electrochemical characteristics. Based on our experimental results, PB conductors with low amount of surface functional groups and high electrical conductivity enhanced the cyclability and the initial discharge capacity. However, deterioration of rate capability and cyclability were observed (or the plasma black treated at $2100^{\circ}C$ For the plasma black conductor prepared from plasma pyrolysis, the effects of properties of carbon black on electrochemical characteristics were combined results of changes in electrical conductivity and structural properties such as agglomeration of plasma black. The conductivity of plasma black increased with treatment temperature, while dispersion of plasma black decreased. As a result, the high cyclability of cell was observed at $800^{\circ}C$ of heat treatment temperature.
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