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초임계 수열법으로 합성한 Li(Ni0.5Mn0.3Co0.2)O2 양극 활물질의 소성 온도영향에 따른 구조 및 전기화학적 특성
추소연,범윤경,김성수,한규승 한국전기화학회 2013 한국전기화학회지 Vol.16 No.3
리튬이온 전지의 양극물질로써, 초임계 수열합성법을 이용해 만들어진 분말은 각각 850oC와 900oC 공기 분위기에서 10시간씩 소성하여 Li(Ni0.5Mn0.3Co0.2)O2를 합성하였다. 온도를 조절함에 따라 합성된 분말은 어떠한 영향을 받는지 x-ray pattern, SEM-image, 물리적 특성과 전기화학적 거동을 관찰해 연구하였다. 그 결과, 900oC에서 열처리된 물질의 입자크기가 850oC에서 열처리된 물질에 비해 더 큰 것으로 나타났고, 특히 초기 가역용량 163.84 mAh/g (0.1 C/2.0- 4.3 V), 186.87 mAh/g (0.1 C/2.0-4.5 V)의 가역용량을 나타내면서 훌륭한 전기화학적 거동을 보였으며, 50th cycle에서도 91.49%(0.2 C/2.0-4.3 V)와 90.36%(0.2 C/2.0-4.5 V)의 높은 용량 유지율을 보였다.
추소연,범윤경,김성수,한규승,Choo, Soyeon,Beom, YunGyeong,Kim, Sungsu,Han, Kyooseung 한국전기화학회 2013 한국전기화학회지 Vol.16 No.3
리튬이온 전지의 양극물질로써, 초임계 수열합성법을 이용해 만들어진 분말은 각각 $850^{\circ}C$와 $900^{\circ}C$ 공기 분위기에서 10시간씩 소성하여 $LiNi_{0.5}Mn_{0.3}Co_{0.2}O_2$를 합성하였다. 온도를 조절함에 따라 합성된 분말은 어떠한 영향을 받는지 x-ray pattern, SEM-image, 물리적 특성과 전기화학적 거동을 관찰해 연구하였다. 그 결과, $900^{\circ}C$에서 열처리된 물질의 입자크기가 $850^{\circ}C$에서 열처리된 물질에 비해 더 큰 것으로 나타났고, 특히 초기 가역용량 163.84 mAh/g (0.1 C/2.0-4.3 V), 186.87 mAh/g (0.1 C/2.0-4.5 V)의 가역용량을 나타내면서 훌륭한 전기화학적 거동을 보였으며, 50th cycle에서도 91.49%(0.2 C/2.0-4.3 V)와 90.36%(0.2 C/2.0-4.5 V)의 높은 용량 유지율을 보였다. As the cathode material for li-ion battery, $LiNi_{0.5}Mn_{0.3}Co_{0.2}O_2$ were synthesized by supercritical hydrothermal method and calcined $850^{\circ}C$ and $900^{\circ}C$ for 10hrs in air. The effect of temperature in the heat treatment on the powder and its performance were studied of xray diffraction pattern, SEM-image, physical properties and electrochemical behaviors. As a result, calcined at $900^{\circ}C$ material particle size more increase than calcined at $850^{\circ}C$ material, especially shows excellent electrochemical performance with initial reversible specific capacity of 163.84 mAh/g (0.1C/2.0-4.3V), 186.87 mAh/g (0.1C/2.0-4.5V) and good capacity retention of 91.49% (0.2C/2.0-4.3V) and 90.36% (0.2C/2.0-4.5V) after 50th charge/discharge cycle.
추소연(Chu, So-Yeon),차지원(Cha, Ji-Won),이명주(Lee, Myoung-Ju) 대한건축학회 2013 대한건축학회논문집 Vol.29 No.6
Though the importance of energy efficient building is being progressively recognized, the absence of the design strategy in early stages of design increases the cost and hinders their proliferation. In order to help novice designers to comprehend a certain level of cost-efficient and energy efficient design integration in an intuitive manner, this research examines architectural design components of the passive house, which could be considered in early phase of design. In this study, plans of 35 PHI certified passive houses in Germany were analyzed, mainly focusing on the “architectural” design vocabulary, rather than building energy performance. The early design stage and its design components are defined in accordance with German and Korean ordinance on architects’ performance and fees. As a result, there was no indispensable requirement for passive house design, even including building orientation and compactness, although every project tends to maximize solar energy use and minimize heat loss through the building envelope. Futhermore, in addition to south facing windows, the open floor plan was also important in circulating warm air for overall indoor thermal comfort. The paper affirms the importance of integrated planning in passive house design, showing that its architectural design vocabulary has already included technical consideration from early phase, such as ventilation, plumbing, technical layout etc.
전열해석 시뮬레이션을 통한 패시브주택의 단열외피 열교 최소화 상세 개발 연구
추소연(Chu, So-Yeon),김정운(Kim, Jeong-Un),이명주(Lee, Myoung-Ju) 대한건축학회 2014 대한건축학회논문집 Vol.30 No.5
Current Korean building energy policy and standards provide only the specific insulating performance standards of the building component and it overlooks the prevention of heat loss caused by thermal bridge when evaluating building performance. In this research, details to minimize the heat loss due to thermal bridge was developed to achieve the linear thermal transmittance criterion(Psi<0.01W/mK) of the German Passivhaus Institut(PHI), performed through two-dimensional heat transfer simulation in a steady-state-condition (ISO 10211:2007). Then, the heat loss from the developed passive house details was compared with the exampled details as per the current Korean building code, and their effect on the annual heating energy demand was weighed according to the calculation method in PHPP(the building energy performance evaluation program of the PHI). Lastly, the possibility of condensation and mould was evaluated by using the temperature factor (ISO 10211:2007). As the result, while the overall heat loss through thermal bridges in enhanced passive house details was minimized to 1.1kWh/m2a, the gross heat loss due to thermal bridge in exampled details was 35.3kWh/m2a, which exceeds alone the annual heating energy demand criterion (15kWh/m2a) for passive house set by PHI. This shows that enhancing the building energy performance to the high-energy-efficient standard will be hindered, if minimizing thermal bridge is left neglected. Therefore, it is necessary to set up specific criteria to minimize the heat loss due to thermal bridge, in order to achieve the Korean building energy-efficiency road map set by the government. In addition, the study for diverse measure to manage the thermal bridge details in design and construction process is needed.
제로에너지단지의 적정 수소 활용 규모 및 운용방식에 관한 연구
김준오,김철희,추소연 한국신·재생에너지학회 2023 신재생에너지 Vol.19 No.3
This study aims to evaluate the optimal size of the hydrogen facility to be installed in a zero-energy district in terms ofload matching and facility efficiency. A mismatch between energy generation and consumption is a common occurrence in zero-energydistricts. This mismatch adversely effects the energy grid. However, using an energy carrier such as hydrogen can solve this problem. To determine the optimal size of hydrogen fuel cells to be used on-site, simulation of hydrogen installation is required at both district-and building- levels. Each case had four operating schedules. Therefore, we evaluated eight scenarios in terms of load matching, heatloss, and facility operational efficiency. The results indicate that district-level installation of hydrogen facilities enables more efficientenergy use. Additionally, based on the proposed model, we can calculate the optimal size of the hydrogen facility.