• Proceedings of the KSEEG Conference
• /
• 2002.04a
• /
• pp.203-206
• /
• 2002

• Proceedings of the KIPE Conference
• /
• 2017.07a
• /
• pp.318-320
• /
• 2017

본 연구는 리튬이온 배터리의 엔트로피를 측정하는 방법인 ETM(Electro Thermodynamics Measurement)을 상용 장비에 적용하는 방법에 관한 것이다. 그리고 엔트로피 측정에 필요한 온도변경시간과 배터리의 relaxation 시간을 최소화함으로써, 측정의 정확성을 유지하면서 측정 시간을 최소화 했다.

• Membrane Journal
• /
• v.33 no.1
• /
• pp.13-22
• /
• 2023

Despite high capacity of lithium metal anode, its uncontrollable dendrite growth results in the poor electrochemical (EC) performance (low Coulomb efficiency and limited cycle stability) and unsafe operation. In this study, we demonstrated a lithium metal anode protected with BaTiO₃/PVDF based piezoelectric layer to enhance its EC performance by utilizing the locally polarized lithium metal after volume expansions. As-formed lithium metal electrode deposited with BTO@PVDF layer exhibited an enhanced Coulombic efficiency (> 98% for 100 cycles) and facilitated lithium ion diffusions (lithium diffusion coefficient: D_Li+), revealing the effectiveness of piezoelectric layer deposited lithium metal electrode approach.

• Journal of Energy Engineering
• /
• v.20 no.2
• /
• pp.109-122
• /
• 2011

The production capacity of EV models should be sufficient to achieve the goal of one million EVs by 2015. Large-Format lithium-ion battery are expected to find a prominent role as ideal electrochemical storage systems in traction power train for sustainable vehicles such as all-electric vehicles. This review focuses first on the present status of production lithium-ion battery technology and cooperative relations of between battery and EV makers, then on its near future development.

• Journal of Energy Engineering
• /
• v.19 no.2
• /
• pp.81-91
• /
• 2010

Plug-in hybrid electric vehicles(PHEVs) are gaining attention over the world due to their abilities to reduce $CO_2$ emission and gasoline/diesel consumption by using electricity from the grid. Lithium ion battery is one of the most suitable candidates as energy storage device for PHEVs applications up to 2030. This review focuses on the present status of lithium ion battery technology, then on comparison of the performance characteristics of the promising cathode materials.

• Transactions of the Korean Society of Mechanical Engineers B
• /
• v.40 no.1
• /
• pp.47-53
• /
• 2016

The electrolyte wetting phenomena occurring in the electrode of lithium-ion battery was studied using lattice Boltzmann method (LBM). Recently, lithium-ion batteries are being mixed with small particles on the active material to increase the capacity and energy density during the electrode design stage. The change to the mixing ratio may influence the wettability of electrolyte. In this study, the changes in electrolyte distribution and saturation were investigated according to various mixing ratios of active material. We found that the variations in mixing ratio of active material affect the wetting mechanism, and result in changes to the wetting speed and wettability of electrolyte.

• Journal of the Korean Electrochemical Society
• /
• v.2 no.1
• /
• pp.1-4
• /
• 1999

A lithium ion battery with polymer electrolyte is expected as a safe and long cycle life battery. This paper reports primarily the recent development results of a solid polymer electrolyte, which is a key factor of the secondary battery system, that has been obtained during the process of the development of a polymer type lithium battery. As a successful result of the solid polymer electrolyte. The ionic conductivity of the solid polymer electrolyte, which is composed of polyacrylonitrile and $LiClO_4\;with\; Al_2O_3$ dissolved as the supporting electrolyte, has been confirmed to be $2.3\times10^{-4} S/cm$ at room temperature.

• Proceedings of the KIPE Conference
• /
• 2018.07a
• /
• pp.225-227
• /
• 2018

일반적으로 리튬이온은 배터리들은 각 배터리마다 고유의 전기화학적 특성을 갖고 있으며 이러한 특성들로 인해서 직렬 또는 병렬로 패키징 되어서 팩으로 사용 될 때 각 셀 간의 전압 불균형이 발생하게 된다. 셀 벨런싱 회로 같은 셀 간 불균형을 회복시켜주는 기능이 없다면 배터리 팩 내의 셀 간 전압 불균형은 시간이 지남에 따라 더 커지게 되고 이는 배터리 팩의 노화를 가속 시키거나 배터리 팩의 성능을 저하시키는 원인이 된다. 이는 폐 리튬이온 배터리 팩을 재활용하는데 있어서도 반드시 고려해야하는 사항으로서 재활용 팩의 사용시간에 영향을 끼칠 수 있다. 위의 문제를 극복하기 위해서는 배터리 팩을 만들기 전에 스크리닝을 통해서 전기화학적 성분이 유사한 배터리들을 팩으로 만드는 것이 필요하다. 일반적으로 프레시 배터리의 용량은 거의 비슷하기 때문에 프레시 배터리 용량은 프레시 배터리를 스크리닝 하기 위한 많은 기준들 중에서 가중치가 크지 않지만 폐 리튬이온 배터리들은 각 배터리마다 고유의 전기화학적 특성을 갖을 뿐만 아니라 각 배터리마다 상이한 배터리 용량을 갖고 있기 때문에 각 배터리의 용량에 프레시 배터리를 스크리닝 할 때보다 큰 가중치를 두어 스크리닝 할 필요가 있다. 본 논문에서는 같은 전류 프로파일로 노화된 배터리 팩 내의 셀들의 전기화학적 특성을 분석하여 폐배터리 셀들을 재활용하기 위한 스크리닝 방법에 대해서 고찰한다.

• Membrane Journal
• /
• v.14 no.4
• /
• pp.263-274
• /
• 2004

The polymeric membrane, a component of battery devices such as Li-ion battery (LIB) and Li-polymer battery (LPB), is a typical material in which the carrier mobility dominates the battery performance. In this paper, the state-of-the-art of membranes for secondary battery is described in terms of membrane properties. Several prerequisites, which are related to stability of battery devices, are discussed to design and prepare suitable polymeric membranes. In addition, physical requirements of membranes and their measurement methods are described to develop applicable polymeric membranes in membrane preparation processes.

• The Journal of the Korea institute of electronic communication sciences
• /
• v.18 no.1
• /
• pp.195-204
• /
• 2023

The drone's battery system uses lithium-ion or lithium-polymer batteries, and it is known that the cause of fire during the disposal process after using the drone is combustible gas from the battery being discarded. Most of the batteries in the disposal process generated oxygen, but a small amount of flammable gas was also generated, and a large amount of chlorine ions and sulfates were also detected in the equipment used for treatment. If a system that detects this early is configured, it will be possible to reduce the risk of accidents caused by discarded batteries.