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비정질 SmFe₂ 합금의 자기적 및 자기변형 특성에 미치는 B 첨가와 열처리 영향
최규길(K. G. Choi),장호(Ho Jang),한석희(S. H. Han),김희중(H. J. Kim),임상호(S. H. Lim) 한국자기학회 2000 韓國磁氣學會誌 Vol.10 No.5
Effects of B addition and heat treatment on the magnetic and magnetostrictive properties of amorphous SmFe₂ thin films are investigated. A significant improvement in the magnetostrictive properties at low magnetic fields is observed with the addition of B. This improvement, however, is achieved at a heavy cost of intrinsic properties such as saturation magnetostriction. For example, at a magnetic field of 30 Oe, magnetostriction of a thin film with a B content of 9.9 at. % is increased from 190 to 333 ppm, but saturation magnetostriction is decreased by more than 50 %. This result is in accord with the deterioration (reduction) of saturation magnetization and the improvement (reduction) of coercive force at this B content. The magnetostrictive properties are also improved by annealing and optimum annealing temperature is found to be in the range 300-400℃. The main reason for the improvement is mainly considered to be due to the reduction of coercive force caused by stress relief, not due to the ultrafine SmFe₂ precipitates which were originally expected to form by annealing.
R.F. 마그네트론 스퍼터링을 이용한 LiCoO<sub>2</sub> 양극활물질의 Ar 증착분압에 따른 박막전지 전극 특성
박호영,임영창,최규길,이기창,박기백,권미연,조성백,남상철,Park, H.Y.,Lim, Y.C.,Choi, K.G.,Lee, K.C.,Park, G.B.,Kwon, M.Y.,Cho, S.B.,Nam, S.C. 한국전기화학회 2005 한국전기화학회지 Vol.8 No.1
Ar공정 분압에 따라 스퍼터링된 $LiCoO_2$박막 양극의 $400^{\circ}C$저온 열처리를 통한 전기화학적 및 미세구조적 특성을 연구하였다. Ar분압이 변화함에 따라 양극 박막의 미세구조 및 조성이 변화하였으며, Ar분압이 증가할수록 $LiCoO_2$ 박막의 안정성 및 전기화학적 특성이 개선되었다. 순환전류전위법 및 정전류 충방전 시험에 의해 전극반응의 가역성 및 안정성 등을 고찰하였으며, 박막의 조성, 결정성, 표면 특성 등 물리적 특성은 ICP-AES, XRD, SEM 및 AFM을 통해 분석하였다. We investigated the electrochemical properties and microstructure on the various argon deposition pressure $(P_{Ar})$ and the low annealing temperature $(400^{\circ}C)$ of $LiCoO_2$ cathodes, which deposited by R.F. magnetron sputtering. The microsuucture and composition of Lico02 thin film was changed as a function of $P_{Ar}$. The capacity and electrochemical properties were improved with Ph of $LiCoO_2$ thin films. The cycling reversibility and stability of thin film batteries were measured by cyclic voltammetry and the constant current charge-discharge. The physical properties of cathode films were analyzed by ICP-AES, XRD, SEM and AFM for composition, crystallization and surface morphology.
알루미나 기판상에 구현된 0.6mAh급 전고상 박막전지
박호영,남상철,임영창,최규길,이기창,박기백,조성백,Park, H.Y.,Nam, S.C.,Lim, Y.C.,Choi, K.G.,Lee, K.C.,Park, G.B.,Cho, S.B. 한국전기화학회 2005 한국전기화학회지 Vol.8 No.4
Lithium cobalt oxide thin film cathode, having thickness of $2.9{\mu}m$ with area of $4cm^2$, was deposited on platinum patterned alumina substrate by radio frequency magnetron sputtering. Li/Co molar ratio, which is an important factor for battery performance, was measured as a function of argon working pressure and applied R.F. power. Constant current charge and discharge performances were characterized with high rate discharge and cycling behavior. Using AC impedance analysis, internal resistance of the thin film battery was measured and simulated by proposed equivalent circuit model. 알루미나 기판을 사용하여 백금 박막 전류 집전체상에 $2.9{\mu}m$ 두께 및 $4cm^2$의 전극면적을 갖는 $LiCoO_2$ 박막을 R.F. 마그네트론 스퍼터링법에 의해 증착하였으며, 아르곤 공정 압력 및 인가된 R.F. 전력량에 따른 Li/Co 몰 비 의존성에 대해 고찰하였다. 비정질계 고체전해질인 Lipon 및 Li 음극이 순차적으로 증착된 박막전지를 제조하여 정전류충, 방전 시험하였으며, 고율방전 특성 및 충, 방전 횟수에 따른 전지 용량 변화를 측정하였다. 교류임피던스를 통해 전지내부의 저항성분을 측정하였으며, 이에 대한 등가회로를 구성하여 시뮬레이션한 결과와 비교하였다.