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리튬이차전지용 탄소 코팅된 Li<sub>2</sub>MnSiO<sub>4</sub> 양극활물질의 상형성 거동 및 충방전 특성
선호정,채수만,심중표,Sun, Ho-Jung,Chae, Suman,Shim, Joongpyo 한국전기화학회 2015 한국전기화학회지 Vol.18 No.4
Planetary ball mill과 고상반응법을 사용하여 실리케이트계 탄소 코팅된 $Li_2MnSiO_4$ 양극활물질 분말을 합성하였으며 충방전 특성을 조사하였다. 전기화학적 활성을 지니는 ${\beta}-Li_2MnSiO_4$ 상을 형성하기 위하여 하소 온도와 분위기를 조절하였으며 ${\beta}-Li_2MnSiO_4$ 단일상에 가까운 탄소 코팅된 $Li_2MnSiO_4$ 활물질 분말을 제조할 수 있었다. 합성된 분말은 100 nm 정도 크기의 1차 입자가 뭉쳐있는 2차 입자 형태를 보였다. $Li_2MnSiO_4$ 활물질에서 Li의 삽입/탈리가 가능하려면 탄소의 첨가가 필요하였으며, 4.8 wt%의 탄소가 코팅된 $Li_2MnSiO_4$ 활물질에서 초기용량 192 mAh/g를 얻을 수 있었다. Carbon-coated $Li_2MnSiO_4$ powders as the active materials for the cathode were synthesized by planetary ball milling and solid-state reaction, and their phase formation behavior and charge-discharge properties were investigated. Calcination temperature and atmosphere were controlled in order to obtain the ${\beta}-Li_2MnSiO_4$ phase, which was active electrochemically, and the carbon-coated $Li_2MnSiO_4$ active material powders with near single phase ${\beta}-Li_2MnSiO_4$ could be fabricated. The particles of the synthesized powders were secondary particles composed of primary ones of about 100 nm size. The carbon incorporation was essential to enable the Li ions to be inserted and extracted from $Li_2MnSiO_4$ active materials, and the initial capacity of 192 mAh/g could be obtained in the $Li_2MnSiO_4$ active materials with 4.8 wt% of carbon.
리튬이차전지에서 대기압 수소플라즈마 처리된 LiNi1/3Co1/3Mn1/3O2 양극 활물질의 특성분석
선호정,이재호,정현영,석동찬,정용호,박경세,심중표 한국수소및신에너지학회 2013 한국수소 및 신에너지학회논문집 Vol.24 No.2
LiNi1/3Co1/3Mn1/3O2 powder for cathode materials in lithium rechargeable batteries was treated by atmospheric plasma containing hydrogen to investigate the relationship between charge/discharge performance and physical/chemical changes of materials. Hydrogen plasma at atmosphere pressure was irradiated on the surface of active materials, and the change for their crystal structure, surface morphology, and chemical composition were observed by XRD, SEM-EDS and titration method, respectively. The crystal structure and surface morphology of H2 plasma-treated powders were not changed but their chemical compositions were slightly varied. For charge/discharge test, H2 plasma affected initial capacity and rate capability of active materials but continuous cycling was not subject to plasma treatment. Therefore, it was observed that H2 plasma treatment affected the surface of materials and caused the change of chemical composition.
아연-공기전지용 페롭스카이트 산화물 촉매의 산소환원반응 특성
선호정,조명연,안정철,엄승욱,박경세,심중표 한국수소및신에너지학회 2014 한국수소 및 신에너지학회논문집 Vol.25 No.4
LaCoO3 powders synthesized by Pechini process were pulverized by planetary ball-milling to decreaseparticle size and characterized as a catalyst in alkaline solution for oxygen reduction and evolution reaction (ORR& OER). The changes of physical properties, such as particle size distribution, surface area and electric conductivity,were analyzed as a function of ball-milling time. Also, the variations of the crystal structure and surface morphologyof ball-milled powders were examined by X-ray diffraction (XRD) and scanning electron microscopy (SEM),respectively. The electrochemically catalytic activities of the intrinsic LaCoO3 powders decreased with increasingball-milling time, but their electrochemical performance as an electrode improved by the increase of the surfacearea of the powder.
금속유기분해법을 사용한 Zr0.7Sn0.3TiO4 박막 제조 및 유전특성
선호정 한국전기전자재료학회 2010 전기전자재료학회논문지 Vol.23 No.4
Zr0.7Sn0.3TiO4 (ZST) thin films were fabricated by metal-organic decomposition, and their dielectric properties were investigated in order to evaluate their potential use in passive capacitors for rf and analog/mixed signal integrated circuits. The ZST thin film annealed at the temperature of 800℃ showed a dielectric constant of 27.3 and a dielectric loss of 0.011. The capacitor using the ZST film had quadratic and linear voltage coefficient of capacitance (VCC) of -65 ppm/V2 and -35 ppm/V at 100 kHz, respectively. It also exhibited a good temperature coefficient of capacitance (TCC) value of -32 ppm/℃ at 100 kHz.
리튬이차전지용 탄소 코팅된 Li2MnSiO4 양극활물질의 상형성 거동 및 충방전 특성
선호정,채수만,심중표 한국전기화학회 2015 한국전기화학회지 Vol.18 No.4
Planetary ball mill과 고상반응법을 사용하여 실리케이트계 탄소 코팅된 Li2MnSiO4 양극활물질분말을 합성하였으며 충방전 특성을 조사하였다. 전기화학적 활성을 지니는 β-Li2MnSiO4 상을형성하기 위하여 하소* 온도와 분위기를 조절하였으며 β-Li2MnSiO4 단일상에 가까운 탄소 코팅된 Li2MnSiO4 활물질 분말을 제조할 수 있었다. 합성된 분말은 100 nm 정도 크기의 1차 입자가 뭉쳐있는 2차 입자 형태를 보였다. Li2MnSiO4 활물질에서 Li의 삽입/탈리가 가능하려면 탄소의 첨가가 필요하였으며, 4.8 wt%의 탄소가 코팅된 Li2MnSiO4 활물질에서 초기용량 192 mAh/g 를 얻을 수 있었다.
박창순,선호정 한국물리학회 2010 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.57 No.41
La1−xSrxMnO3 thin films with different values of x were prepared in order to search for the best composition in terms of the electrical resistivity at room temperature. The metal-organic decomposition method through spin-coating and subsequent crystallization annealing was employed for their preparation. From the observed variation of the resistivity, the best composition of x = 0.4(La0.6Sr0.4MnO3) with the minimum resistivity was selected. The crystallization behavior and the microstructure of the La0.6Sr0.4MnO3 thin films with the selected composition were investigated by applying crystallization annealing. We successfully fabricated a single-phase La0.6Sr0.4MnO3thin film by annealing it at a temperature of 800 ℃. A resistivity value of 4.2 × 10−1Ω·cm was obtained from the film. When the La0.6Sr0.4MnO3 thin film was used as a bottom electrode for a ferroelectric capacitor, a nicely-shaped polarization-electric field hysteresis loop was obtained. It was revealed that the application of the La0.6Sr0.4MnO3 thin film obtained by the MOD route was feasible.
RF 마그네트론 스퍼터법을 사용한 전도성 SrMoO<sub>3</sub> 박막 제조 및 전기전도특성 평가
유희욱,선호정,Ryu, Hee-Uk,Sun, Ho-Jung 한국전기전자재료학회 2011 전기전자재료학회논문지 Vol.24 No.6
Conductive $SrMoO_3$ thin films were fabricated by RF magnetron sputtering with the powder-type sputtering target, and annealed for crystallization. When RTP (rapid thermal processing) in vacuum was applied, the fabricated thin films showed the mixed phases of $SrMoO_3$ and $SrMoO_4$, but $SrMoO_3$ phase could be promoted by the lowering of the working pressure during deposition. In order to eliminate $O_2$ gas during deposition and annealing, further lowering of the working pressure and furnace annealing in hydrogen atmosphere were tried. With the optimization of the deposition and annealing conditions, the thin film with nearly single-phase of $SrMoO_3$ was obtained, and it showed good electrical conduction properties with a low resistivity of $2.5{\times}10^{-3}{\Omega}{\cdot}cm$ at room temperature.
RF 스퍼터법을 이용한 Sr2FeMoO6 박막 제조 및 전기전도 특성
유희욱,선호정 한국전기전자재료학회 2010 전기전자재료학회논문지 Vol.23 No.12
Single-phase Sr2FeMoO6 thin films were produced by RF magnetron sputtering for use as electrodes in integrated sensors and found to be good conductors at room temperature. The films were deposited from a powder-type sputtering target under various conditions, and were crystallized by annealing. Elimination of O2 gas during deposition, by the use of a solely Ar sputtering gas under a working pressure as low as possible, and vacuum annealing were important to promote the Sr2FeMoO6phase. However, oxygen exclusion from sputtering and annealing was not enough to yield single-phase Sr2FeMoO6: hydrogen annealing was also required. Film production was optimized by varying the deposition parameters and hydrogen annealing conditions. The film had good electrical conduction, with a low resistivity of 1.6×10-2Ω․cm at room temperature.