http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
$LiCoO_2/MPCF$전지에서 정$\cdot$부극 중량비의 영향
김상필,조정수,김희제,박정후,윤문수,Kim Sang-Pil,Cho Jeong-Soo,Kim Hee-Je,Park Jeong-Hu,Yun Mun-Soo 한국전기화학회 1999 한국전기화학회지 Vol.2 No.2
Li-ion 2차전지는 정극재료로 리튬전이금속산화물을, 부극재료로 탄소를 사용한다. 고용량 및 장수명을 지닌 Li-ion 2차 전지를 제작하기 위하여, 충전중에 탄소표면에 리튬 석출이 없이 전극 활물질의 이용율은 가능한 높아야 한다. 정극 및 부극 재료의 balance 및 적절한 충전 방식이 Li-ion 2차전지의 설계에 있어서 중요한 요소이다. 본 연구에서는 $LiCoO_2/MPCF$전지의 성능에 미치는 정$\cdot$부극 중량비의 효과를 고찰하였다. 먼저 각 반전지의 충방전 특성을 평가하였다. 그리고 흑연화 MPCF를 부극으로, $LiCoO_2$를 정극으로 사용하여 원통형 Li-ion 2차전지를 제작하였다. 기준전극으로 리튬금속을 사용하여 $LiCoO_2/MPCF$전지에서 각 반전지의 전위를 측정하였다. 또한 중량비에 따른 $LiCoO_2/MPCF$ 전지의 충방전 수명 성능을 평가하였다. 시험 결과, $LiCoO_2$ 정극의 이용율은 중량비에 의존하지 않지만, MPCF부극 이용율은 중량비에 크게 의존하였다. 또한, $LiCoO_2/MPCF$전지의 최적 중량비는 $2.0\~2.2$인 것으로 판단되었다. Li-ion cells employ lithium transtion metal oxide as the cathode material and carbon as anode material. To manufacture Li-ion cell with higher capacity and better cycle life, the utilization of electrode materials should be as high as possible without lithium deposition onto the carbon surface during charging. A careful design of cell balance between cathode and anode materials as well as a proper charge method is a key factor to design Li-ion cell with long cycle life. In this study, we investigated the effect of cathode/anode weight ratio on the performance of $LiCoO_2/MPCF$ cell. First we evaluated the charge-discharge behaviours of half-cells. And cylindrical Li-ion cells were fabricated using graphitized MPCF anode and $LiCoO_2$ cathode. The voltage profiles for each half-cell in $LiCoO_2/MPCF$ cell were measured by using lithium metal as a reference electrode. Also, we evaluated the cyclic performance of $LiCoO_2/MPCF$ cells according to weight ratio. From the result of experiment $LiCoO_2$ cathode utilization was independent of weight ratio, but MPCF anode utilization was dependant on weight ratio. Also, the optimal weight ratio of $LiCoO_2/MPCF$ cell was found to be $2.0\~2.2$.
김상필,정용재,Kwang-Ryeol Lee,Seung-Cheol Lee 한국물리학회 2004 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.44 No.1
Many attempts have been made to understand the dynamics of thin lm growth by using molecular dynamics. In accordance with the latest results for Co on deposited an Al substrate, which were obtained by using molecular dynamics, the surface compounds turned out to be formed in a few layers. The causes of the surface compound formation were also reported to be a relatively high value of the local acceleration induced by the strong chemical anity between Co and Al and a low value for the activation barrier. However, since the former investigations reported the local acceleration under ideal conditions, comprehensive approaches are needed for the sake of understanding the actual deposition and growth behaviors of atoms. In the present work, we performed a quantitative analysis of the local acceleration for various deposition energies of the incident atom and its dependence on the surface orientation. Incident 0.1 eV Co atoms were accelerated to about 1.5 3.5 eV in the vicinity of the Al(001) surface, and this observation was always the same in magnitude, irrespective of the incident energy. Also, the local accelerations were distributed widely for the various surface orientations. Specially, the (111) surface had a higher acceleration on average than any other surfaces [(001), (011)], and the (011) surface had the widest distribution.
도전재 첨가량에 따른 리튬폴리머 2차 전지 MCMB 부극의 전기적 특성
김상필,정재국,남효덕 嶺南大學校 工業技術硏究所 2002 工業技術硏究所論文集 Vol.30 No.2
Anode characteristics of Lithium Polymer Batteries(LPB) were investigated by adding different contents of conducting agents. Super P Black(SPB), Vapor Carbon Grown Fiber(VGCF) and Kuraha Carbon Fiber(KCF) were used as conducting agents with active material of Mesocarbon Microbeads(MCMB). In consequence, the internal resistance of LPB was decreased by increasing the amounts of conducting agents. AS a result, the conductivity of the battery improved upto 0.27×10 exp (-3)S/㎝, 0.4×10 erxp (-3)-3S/㎝ and 0.36×10 exp (-3)S/㎝ by adding SPB, VGCF and KCF as conducting agents to the anode, compared to that of the anode without conducting agents.