• Proceedings of the KIPE Conference
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• 2011.07a
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• pp.52-53
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• 2011

현재 화석연료의 고갈과 이산화탄소의 배출로 인한 지구 온난화 문제로 인하여 전기 자동차의 연구가 활발히 진행 중에 있다. 본 논문에서는 전기 자동차용 배터리 충전 시스템의 급속충전 방식을 연구한다. 본 연구에서 사용하는 급속충전 방식은 기존의 CV/CC(정전압/정전류)제어 방식에서 CC모드를 충분히 확보하여 충전시간을 단축하는 방식으로 실험을 통해 그 동작을 검증한다.

• Journal of Sensor Science and Technology
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• v.28 no.6
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• pp.407-413
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• 2019

Using 3D printing technology, we created a biomimetic water strider robot that can monitor environments. We found ways to increase the bearing capacity of the fluid-driven water strider robot by conducting experiments then comparing with more stable robots. The controller of the robot is based on Arduino, and can be controlled wirelessly with a Bluetooth module. The speed of the robot is 7.37 cm/s, and the bearing capacity is 29 g. A lithium polymer battery that can be charged with a solar cell was used as a power source, and both the charging and driving times were also explored.

• Proceedings of the KIPE Conference
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• 2014.11a
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• pp.58-59
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• 2014

본 논문에서는 비례-적분(PI) 제어의 상태관측기를 구성하여 리튬폴리머 배터리의 충전량(SOC)을 추정하는 기법에 대해 설계한 뒤 실험을 통하여 검증하였다. 리튬폴리머 배터리는 1차 R-C 등가모델로 단순화하여 표현하였고, PI상태관측기를 Matlab/Simulink에서 설계하였다. 상온($25^{\circ}C$)에서 양방향 DC-DC 컨버터를 이용하여 리튬폴리머 배터리에 FTP-72 충 방전 사이클의 전류패턴을 인가한 뒤 SOC 추정기법을 검증하였다. PI상태관측기는 임의의 초기 SOC 상태에서도 오차율 2%이내로 SOC를 추정하여 모델링 에러나 외란에도 강인한 특성이 있는 것을 확인하였다.

• Proceedings of the KIEE Conference
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• 1996.07c
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• pp.1685-1687
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• 1996

Recently, conducting polymer has been much attracted as novel materials because of its electronic behavior and functional application by doping process. In this paper, we electrochemically synthesized polyaniline films under potential sweep conditions, which exhibit high electric conductivity about 200 S/cm. Specific energy of 600 Wh/kg and Ah efficiency 98% were achieved during the charge/discharge cycling using liquid electrolyte system. On the other hand, consequences of the cycling were 260 Wh/kg and 95% Ah efficiency using polyethylene oxide(PEO) based solid-state electrolyte system.

• 한국전기화학회:학술대회논문집
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• 2004.11a
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• pp.75-108
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• 2004

The market, development and trend of Lithium ion Batteries in China are introduce briefly. Early, Chinese manufactories were busy to expand and many new battery factories have been built up. Now, the relatively large companies pay more attentions on comprehensive quality improvement, therefore the production processing and facilities have been also modified in some extent. The recent technology progresses focus on High capacity (energy density), High rate, High average voltage, High safety, High temperature properties, Long cycle life, Low temperature properties, Low self discharge, Low cost, Super-large, Super-small, Super-thin, Consistency, Customization, and Environment friendly processing, simply $H_5L_4S_3C_2E_1$. Lithium ion polymer batteries which all batteries packaged with soft lamination film are named as in China have a quick growth and emphasized here because of their advantages ins $H_5L_4S_3C_2E_1$ for which it is quite difficult to be realized at the same time. Some of research works such as listed above are introduced. The other contends related to application trend of Lithium ion batteries and projects carrying out are also included.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 1996.11a
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• pp.218-220
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• 1996

A composite films were prepared by using Polyphenylenediamine(PPD) synthesized in our lab. and crystalline V$_2$O$_{5}$ in various mixture ratio for using positive active material of polymer film battery. The thermal stability of prepared composite film was carried out by using TGA. Electrical conductivity of composite film were also measured by using four-probe method in dry box. The thermal stability of prepared composite film is more than 35$0^{\circ}C$. The electrical conductivity of composite film increased and showed the highest value(about 23 S/cm) when doped at 0.4% LiCiO$_4$solution.n.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 1996.11a
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• pp.105-108
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• 1996

The positive active material for polymer film battery was prepared by using Polyphenylenediamine(PPD) synthesized in our lab. and 2.5-dimercapto-1, 3, 4-thiadiazole(DMcT) in various mixture ratio. The transference measurement of surface morphology and thermal stability of prepared composite film was carried out by using SEM and TGA, respectively. Electrocyhemical property and electrical conductivity of composite film were also measured by using cyclic voltammetry and four-probe method in dry box, respectively. The thermal stability of prepared composite film is more than 20$0^{\circ}C$. The electrical conductivity of composite film increased and showed the highest value(about 3 S/cm)when doped at 0.4% LiClO$_4$solution. And we could confirm that DMcT effect on reactiviation of PPD through cyclic voltammogram.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 1996.11a
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• pp.109-112
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• 1996

The purpose of this study is to research and develop solid polymer electrolyte(SPE) for all-stolid-state lithium battery. We investigated conductivity, electrochemical properites and impedence spectroscopy of poly(ethylene oxide)[PEO]/poly(vinylidene fluoride)[PVOF] blend electrolytes and charge/discharge cycling of LiCoO$_2$/SPE/Li cell. By adding PVDF and plasticizer to PEO-LICIO$_4$electrolyte, its condustivity was higher than that of PEO-LiCIO$_4$electrolyte. Also PEO$_4$PVDF$_4$LiClO$_4$PC$_{5}$EC$_{5}$ remains stable up to 4.4V vs Li/Li. The discharge capacity of the LiCoO$_2$composite cathode was 92mAh/g based on LiCoO$_2$.EX>.

• Proceedings of the KSR Conference
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• 2008.06a
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• pp.1968-1977
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• 2008

A bimodal low-floor tram is designed to provide the flexibility of bus and the punctuality of trains together to the passengers. Its propulsion system is a series hybrid type using a set of CNG engine generator and Li-polymer battery. The present paper describes the specifications of the propulsion system in the bimodal tram which was drawn by a desirable driving cycle. In addition, it shows how the propulsion system of the bimodal tram can be controlled. With using a computer simulation tool of hybrid vehicles, ADVISOR, the performance of the bimodal tram was verified.

• Journal of the Korean Electrochemical Society
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• v.6 no.3
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• pp.174-177
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• 2003

Electric double-layer capacitors based on charge storage at the interface between a high surface area activated carbon electrode and an electrolyte solution are characterized by their long cycle-life and high power density in comparison with batteries. However, energy density of electric double-layer capacitors obtained at present is about 6 Wh/kg at a power density of 500W/kg which is smaller as compared with that of batteries and limits the wide spread use of the capacitors. Therefore, a new capacitor that shows larger energy density than that of electric double-layer capacitors is proposed. The new capacitor is the hybrid capacitor consisting of activated carbon cathode, carbonaceous anode and an organic electrolyte. Maximum voltage applicable to the cell is over 4.2V that is larger than that of the electric double-layer capacitor. As a result, discharged energy density on the basis of stacked volume of electrode, current collector and separator is more than 18Wh/l at a power density of 500W/l.