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신지웅,남윤채,손종태 한국전기화학회 2019 한국전기화학회지 Vol.22 No.4
The first commercialized cathode material, LiCoO2, suffers from disadvantages such as high cost and toxicity and also possesses safety problems. The nickel-rich LiNi0.9Mn0.1O2 cathode material, used as an alternative to LiCoO2, has highly reversible capacity and high energy density. So, the nickel-rich LiNi0.9Mn0.1O2 cathode material is widely used as an alternative to LiCoO2 due to its highly reversible capacity and high energy density. However, LiNi0.9Mn0.1O2 has several disadvantages as well, such as poor cycle performance and poor thermal instability. To address these problems, we synthesized a new material, LiNi0.5Mn0.5O2, as a shell on the surface of a core to suppress the surface degradation. The new material showed high structural and thermal stabilities and could also maintain a high capacity. The capacity retention of the core-shell cathode (87.7%) was better than that of the core cathode (76.9%) after 50 cycles. Analysis using differential scanning calorimetry revealed that the heat generation in the core-shell cathode (65.9 Jg-1) was lower than that in the core cathode (559.7 Jg-1).
신지웅,손종태 한국물리학회 2019 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.74 No.1
LiNi0:95Al0:05O2 cathode materials have attracted much interest as lithium storage materials for rechargeable lithium batteries because of their high capacity and low cost. However, they exhibit poor cycling performance and thermal instability. We synthesized Li[Ni0:87Co0:08Al0:05]O2 as a shell with high structural and thermal stability on the core surface to suppress surface degradation while maintaining high capacity. The capacity retention of the core-shell cathode after 30 cycles was 87%, which was better than that of the bare cathode (73%). Dierential scanning calorimetry analysis revealed that the heat generation of the core-shell cathode was 331.4 Jg1, which was lower than that of the bare cathode (487.5 Jg-1).
단독 주택의 제로에너지건축물 인증을 위한 태양광시스템 최적화에 관한 연구
신지웅,윤재현,고정림 한국태양에너지학회 2019 한국태양에너지학회 논문집 Vol.39 No.3
As part of the government’s energy policy, Zero Energy Building certification was launched on January of 2017. However, the three passive-housing rental housing projects are the only ZEB-certified detached housing since the certification’s launch. The reason is that, in order for a detached housing to earn ZEB certification, it has to secure self-reliance in energy, and a photovoltaic system is the only viable renewable energy system. Therefore, conducting an analysis to optimize the photovoltaic system in an early design stage is strongly recommended. This study aimed to propose an optimal photovoltaic system design for a detached housing after analyzing through the ECO2 energy simulation of 44 cases, varying in a module type and efficiency, inclination and azimuth. As a result, 15 cases out of 44 cases were analyzed to satisfy ZEB evaluation criteria, and it is thought that these data could contribute greatly to the expansion of ZEB certification dissemination.