• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 1997년도 춘계학술대회 논문집
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• pp.269-272
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• 1997

The Lithium ion secondary battery has been developed for high energy density of portable electrical device and electronics. Among the many conductive polymer materials, the positive active film for Li polymer battery system was synthesized successfully from polyphenylene diamine(PPD) by chemical polymerization in our lab. And PPD-DMcT(2, 5-dimercapto-1, 3, 4-thi-adiazole) composite flim conductive material, at high temperature was also prerared with the addition of dimethylsulfoxide(DMSO). The surface morphology and thermal stability of prepared composite flim was carried out by using SEM and TGA, respectively. Electrochemical and electrical conductivity of composite flim were also discussed by cyclic voltammetry and four-probe method in dry box(<27pm). And the electrode reaction mechanism was detected and analyzed from the half cell unit battery system.

• 전력전자학회논문지
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• 제21권1호
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• pp.72-79
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• 2016

Uninterruptible power supplies are extensively used as backup power in various applications such as telecommunication systems, Internet data centers, hospitals, and military technologies. Some of these applications require a considerable number of batteries, and the maintenance of such batteries is critical for the reliability of a system. However, batteries are chemical energy storage devices that deteriorate over time and frequently inspecting their performance and suitability is difficult. A real-time remote battery inspection system that applies electrochemical impedance spectroscopy is proposed and implemented in this study. The proposed system consists of a small inspection circuit and software for control. The former is developed to monitor the impedance variation of the battery and to diagnose its state. The validity and feasibility of the proposed system is proven by experimental results.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2003년도 추계학술대회 논문집 Vol.16
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• pp.602-606
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• 2003

Silicon has been developed as an alternate anode material for lithium secondary batteries. A simple approach to improve the electrical contact of silicon powder has described. Carbon-coated and silver-coated silicon have been prepared by chemical vapor deposition and electroless plating respectively. Assembled cells, which consisted of surface modified silicon, lithium foil and $Li^+$ contained organic electrolyte, have been studied using electrochemical methods. Carbon-coated silicon was improved in the electrochemical performance such as reversibility and resistance compared to surface-unmodified silicon.

• International Journal of Internet, Broadcasting and Communication
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• 제16권3호
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• pp.236-241
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• 2024

Due to the recent emphasis on carbon neutrality and environmental regulations, the global electric vehicle (EV) market is experiencing rapid growth. This surge has raised concerns about the recycling and disposal methods for EV batteries. Unlike traditional internal combustion engine vehicles, EVs require unique and safe methods for the recovery and disposal of their batteries. In this process, predicting the lifespan of the battery is essential. Impedance and State of Charge (SOC) analysis are commonly used methods for this purpose. However, predicting the lifespan of batteries with complex chemical characteristics through electrical measurements presents significant challenges. To enhance the accuracy and precision of existing measurement methods, this paper proposes using a Long Short-Term Memory (LSTM) model, a type of deep learning-based recurrent neural network, to diagnose battery performance. The goal is to achieve safe classification through this model. The designed structure was evaluated, yielding results with a Mean Absolute Error (MAE) of 0.8451, a Root Mean Square Error (RMSE) of 1.3448, and an accuracy of 0.984, demonstrating excellent performance.

• Journal of Electrochemical Science and Technology
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• 제8권1호
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• pp.15-24
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• 2017

A comparative study was performed on the passivating abilities of surface films generated on lithium titanate (LTO; $Li_4Ti_5O_{12}$) electrodes during pre-cycling at two different rates. The surface film deposited at a faster pre-cycling rate (i.e., 0.5 C) is irregularly shaped and unevenly covers the LTO electrode. Owing to the incomplete coverage of the protective film, this LTO electrode exhibits poor passivating ability. Additional electrolyte decomposition and concomitant film deposition occur during subsequent charge/discharge cycles. As a result of the thick surface film, severe cell polarization occurs and eventually causes cell failure. However, pre-cycling the Li/LTO cell at a slower rate (0.1 C) improves cell polarization and capacity retention; this occurs because the surface film uniformly covers the LTO electrode and provides strong passivation. Accordingly, there is no significant film deposition during subsequent charge/discharge cycling. Additionally, self-discharge is reduced during high-temperature storage.

• Korean Chemical Engineering Research
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• 제51권2호
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• pp.263-266
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• 2013

본 연구에서는 친수화 처리된 격리막을 이용한 니켈수소전지의 전기화학적 특성을 연구하였다. 수계 전해액을 사용하는 니켈수소전지로의 적용을 위해 폴리올레핀계 분리막을 친수화 처리하였다. 친수화 미처리품은 방전성능, 용량보존성, 내구성 등의 전기화학적 성능에서 KS 규격기준에 미달되었지만 친수화 처리품은 KS 규격기준을 모두 만족시켰다. 친수화 처리품을 적용한 모든 시료는 유사한 전지성능을 보여주었다. 그 중 술폰화 처리 시료의 경우 용량 보존율(>88%) 측면에서 가장 우수한 특성을 보였으며, 불소화 처리시료는 내구성 측면에서 가장 우수한 성능을 보였는데, 이는 KS 규격기준(500회)과 비교할 때 약 3배 정도(1480회)의 우수한 성능을 유지함을 확인하였다.

• 에너지공학
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• 제20권1호
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• pp.1-7
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• 2011

전기자동차(Electric Vehicle, EV)와 하이브리드 전기자동차(Hybrid Electric Vehicle, HEV)의 성능과 수명주기 비용은 배터리 팩에 좌우된다. 팩 내부의 비정상적인 온도분포는 전지간의 전기적인 불균형을 가져오고 팩의 성능을 떨어뜨리기 때문에 팩 내부의 온도 균일성은 EV와 HEV용 전지 팩의 최적 성능을 위한 중요한 요소이다. 본 연구에서는 EV와 HEV용 리튬이온전지 팩의 열적 거동을 예측하기 위해 삼차원 전산 모사를 하였다. 전지 팩의 열전도도는 각종 구성요소의 열전도 저항이 직렬과 병렬로 연결되어 있는 것으로 간주하였다. 셀에서의 열 발생량은 전지내부의 전기화학적 반응에 의한 반응열과 전류의 흐름과 내부저항에 의한 열을 고려하여 계산 하였다.

• 한국고분자학회지:고분자과학과기술
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• 제1권6호
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• pp.331-341
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• 1990

• 한국전기화학회:학술대회논문집
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• 한국전기화학회 1999년도 전지기술심포지움
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• pp.33-52
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• 1999

• 한국전기화학회:학술대회논문집
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• 한국전기화학회 2000년도 전지기술심포지움
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• pp.39-49
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• 2000