• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 1999년도 추계학술대회 논문집
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• pp.395-397
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• 1999

There are many efforts to improve electrolytes to satisfy the requirements of a lithium rechargeable battery. We have investigated a binary solvent mixture containing the electrolyte lithium salt($LiBF_4$, $LiPF_6$), that is conductive and electrochemically stable. Ionic conductivities were measured between -5 and $80^{\circ}C$, and cyclic voltammetry between 2.5 and 4.3 V were measured by SUS or platinum electrode.

• 세라미스트
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• 제21권4호
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• pp.416-426
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• 2018

Water splitting is regarded as one of the most environmentally benign routes for hydrogen production. Nevertheless, the low energy efficiency to produce the hydrogen has been a critical bottleneck, which is attributable to the multi-electron and multi-step reactions during water splitting reaction. In this respect, the development of efficient, durable, and inexpensive catalysts that can promote the reaction is indispensable. Extensive searching for new catalysts has been carried out for past decades, identifying several promising catalysts. Recently, researchers have found that conventional battery materials; particularly high-voltage intercalation-based cathode materials, could exhibit remarkable performance in catalyzing the water splitting process. One of the unique capabilities in this class of materials is that the valency state of metals and the atomic arrangement of the structure can be easily tailored, based on simple intercalation chemistry. Moreover, taking advantage of the rich prior knowledge on the intercalation compounds can offer the unexplored path to identify new water splitting catalysts.

• 공업화학
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• 제30권2호
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• pp.133-140
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• 2019

Two-dimensional (2D) ultrathin molybdenum dichalcogenides $MoS_2$ has gained a great deal of attention in energy conversion and storage applications because of its unique morphology and property. The 2D $MoS_2$ nanosheets provide a high specific surface area, 2D charge channel, sub-nanometer thickness, and high conductivity, which lead to high electrochemical performances for energy storage devices. In this paper, an overview of properties and synthetic methods of $MoS_2$ nanosheets for applications of supercapacitors and rechargeable batteries is introduced. Different phases triangle prismatic 2H and metallic octahedral 1T structured $MoS_2$ were characterized using various analytical techniques. Preparation methods were focused on top-down and bottom-up approaches, including mechanical exfoliation, chemical intercalation and exfoliation, liquid phase exfoliation by the direct sonication, electrochemical intercalation exfoliation, microwave-assisted exfoliation, mechanical ball-milling, and hydrothermal synthesis. In addition, recent applications of supercapacitors and rechargeable batteries using $MoS_2$ electrode materials are discussed.

• 공업화학전망
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• 제23권1호
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• pp.18-29
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• 2020

배터리 구동 기기의 사용이 계속적으로 증가하고 첨단화, 다기능화, 융합화가 되면서 고에너지 밀도 배터리에 대한 수요는 지속적으로 증가하고 있다. 배터리의 에너지 밀도를 높이는 여러 가지 전략 중에서 활물질 코팅 두께를 늘려 에너지를 저장하지 않는 집전체와 분리막의 사용량을 줄이고 배터리의 중량, 부피, 그리고 가격을 동시에 줄이는 전략은 간단하면서도 매우 효율적인 방법이다. 하지만 기존 전극 제작 방법으로 후막 전극을 제작할 경우 전극 제작 자체가 쉽지 않고 만들었다고 해도 전자와 이온의 두께 방향 이동 지연으로 인해 전극의 전기화학 특성이 좋지 않다. 이러한 문제점을 극복하고자 이차 전지용 첨단 후막 전극에 대한 연구가 활발하게 진행되고 있다. 본 기고문에서는 이차 전지용 후막 전극의 구조, 제조방법, 전기화학 특성에 관한 연구동향을 소개하고자 한다.

• 대한화학회지
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• 제68권2호
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• pp.87-92
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• 2024

The commercialization of rechargeable metal-air batteries is extremely desirable but designing stable oxygen reduction reaction (ORR) catalysts with non-noble metal still has faced challenges to replace platinum-based catalysts. The nonnoble metal catalysts for ORR were prepared to improve the catalytic performance and stability by the thermal decomposition of ZIF-8 with optimum cobalt loading. The porous carbon was obtained by the calcination of ZIF-8 and different loading amounts of Co nanoparticles were anchored onto porous carbon forming a Co/PC catalyst. Co/PC composite shows a significant increase in the ORR value of current and stability (500 h) due to the good electronic conductive PCN support and optimum cobalt metal loading. The significantly improved catalytic performance is ascribed to the chemical structure, synergistic effects, porous carbon networks, and rich active sites. This method develops a new pathway for a highly active and advantageous catalyst for electrochemical devices.

• Advances in aircraft and spacecraft science
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• 제11권1호
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• pp.23-31
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• 2024

This paper addresses the enhancement of long-endurance solar-powered aircraft through the integration of a rechargeable battery and Maximum Power Point Tracking (MPPT) controller. Traditional long-endurance aircraft often rely on non-renewable energy sourcessuch as batteries orjetfuel, contributing to carbon emissions. The proposed system aims to mitigate these environmental impacts by harnessing solar energy and efficiently managing its storage and utilization. The MPPT controller optimizes the power output of photovoltaic cells, enabling simultaneous charging and discharging of the battery for propulsion and servo control. A prototype is presented to illustrate the practical implementation and functionality of the proposed design, marking a promising step towards more sustainable and enduring solar-powered flight.

• 한국재료학회:학술대회논문집
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• 한국재료학회 1994년도 추계 학술발표 강연 및 논문 개요집
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• pp.109-109
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• 1994

• 한국전기화학회:학술대회논문집
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• 한국전기화학회 1999년도 제3회 총회 및 추계학술발표회
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• pp.61-61
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• 1999

• 한국전기화학회:학술대회논문집
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• 한국전기화학회 1998년도 제1회 총회 및 추계학술발표회
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• pp.84-84
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• 1998

• 한국전기화학회:학술대회논문집
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• 한국전기화학회 2001년도 춘계총회 및 학술발표회
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• pp.31-31
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• 2001