• 제목/요약/키워드: Lithium ion secondary battery

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PC기반의 스마트 배터리 보호모듈 자동 검사 시스템 개발 (Development of PC-based Auto Inspection System for Smart Battery Protection Circuit Module)

  • 윤태성;장기원;박준호;이정재
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2005년도 심포지엄 논문집 정보 및 제어부문
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    • pp.275-277
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    • 2005
  • In a lithium-ion battery which is being used in many portable electronic goods, electrolyte is disaggregated and then the gas is happened when electric charging volt is over the 4.5V. So, the pressure on the safety valve is increased and electrolyte is leaked out in the cell. It leads to the risk of explosion. On the other hand, in the case which the battery is discharged excessively, the negative pole is damaged and the performance of the battery is deteriorated. The protection module of a lithium-ion battery is used for preventing such risk and the inspection system is needed to check the performance of such protection module. In this research, a PC-based auto inspection system is developed for the inspection of a battery protection module using Dallas chipset. In the inspection system, AVRl28 chip is used as a controller and the communication protocol is developed for the data communication between the protection module and the AVR128 chip. And GPIB interface is used for the control of measuring devices. Also, MMI environment is developed using LabView for convenient monitoring by the tester.

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실리콘 재료의 표면개질에 따른 리튬이차전지 음극 특성 (Electrochemical Properties of Surface-Modified Silicon as Anode for Lithium Secondary Batteries)

  • 박철완;도칠훈;문성인;윤문수
    • 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.

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고용량 리튬이온이차전지용 고내열성 분리막 코팅장비 연구 (A Study on High Thermal Stable Separator Coating Machine for High-Capacity Lithium Ion Secondary Battery)

  • 노진희;손화진;이호철;박정현
    • 한국기계가공학회지
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    • 제18권12호
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    • pp.45-51
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    • 2019
  • As the separator becomes thinner, the role of thermal stability becomes more important in ensuring the high capacity of medium- and large-sized lithium-ion secondary batteries. In this study, we researched coating technology to improve the separator's thermal stability. We minimized the coating time by optimizing the design of a vertical two-stage coater that was thin, uniform, and capable of coating on both sides at the same time with a maximum 2㎛ thickness coating layer of fluorinated polymer (PVdF-HFP) on the bare polyethylene (PE) separator, which increased the thermal stability. In addition, during the coating process, a dual-jacket-roll method of drying was developed that increased the drying effectiveness without thermal damage to the separator. We also investigated the thermal stability of the separator manufactured from a coating machine, and studied the battery-applied performance by making a lithium-ion pouch battery.

In Situ X-ray Absorption Spectroscopic Study for α-MoO3 Electrode upon Discharge/Charge Reaction in Lithium Secondary Batteries

  • Kang, Joo-Hee;Paek, Seung-Min;Choy, Jin-Ho
    • Bulletin of the Korean Chemical Society
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    • 제31권12호
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    • pp.3675-3678
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    • 2010
  • In-situ X-ray absorption spectroscopy (XAS) was used to elucidate the structural variation of $\alpha-MoO_3$ electrode upon discharge/charge reaction in a lithium ion battery. According to the XAS analysis, hexavalent Mo atoms in $\alpha-MoO_3$ framework are reduced as the amount of intercalated lithium ions increases. As lithium de-intercalation proceeds, most of pre-edge peaks are restored again. However, according to the Fourier transforms of the extended X-ray absorption fine structure (EXAFS) spectra, lithium de-intercalation reaction is partially irreversible upon the charge reaction, which is one of the main reasons why the capacity of $\alpha-MoO_3$ electrode decreases upon successive discharge/charge cycles.

포스트 리튬 이차전지 기술 동향 (Technology Trends in Post-Lithium Secondary Batteries)

  • 최윤호;정형석
    • 전자통신동향분석
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    • 제38권6호
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    • pp.128-136
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    • 2023
  • Lithium accounts for only 0.0017% of the earth crust, and it is produced in geographically limited regions such as South America, the United States, and China. Since the first half of 2017, the price of lithium has been continuously increasing, and with the rapid adoption of electric vehicles, lithium resources are expected to be depleted in the near future. In addition, economic blocs worldwide face intensifying scenarios such as competition for technological supremacy and protectionism of domestic industries. Consequently, Korea is deepening its dependence on China for core materials and is vulnerable to the influence of the United States Inflation Reduction Act. We analyze post-lithium secondary battery technologies that rely on more earth-abundant elements to replace lithium, whose production is limited to specific regions. Specifically, we focus on the technological status and issues of sodium-ion, zinc-air, and redox-flow batteries. In addition, research trends in post-lithium secondary batteries are examined. Post-lithium secondary batteries seem promising for large-capacity energy storage systems while reducing the costs of raw materials compared with existing lithium-based technologies.

초고압 합성법으로 제조한 리튬이온전지 음극활물질 Li4Ti5O12의 전기화학적 특성 (Electrochemical Performance of Li4Ti5O12 Particles Manufactured Using High Pressure Synthesis Process for Lithium Ion Battery)

  • 지성화;조완택;김현효;김효진
    • 한국재료학회지
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    • 제28권6호
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    • pp.337-342
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    • 2018
  • Using a high pressure homonizer, we report on the electrochemical performance of $Li_4Ti_5O_{12}(LTO)$ particles manufactured as anode active material for lithium ion battery. High-pressure synthesis processing is performed under conditions in which the mole fraction of Li/Ti is 0.9, the synthesis pressure is 2,000 bar and the numbers of passings-through are 5, 7 and 10. The observed X-ray diffraction patterns show that pure LTO is manufactured when the number of passings-through is 10. It is found from scanning electron microscopy analysis that the average size of synthesized particles decreases as the number of passings-through increases. $LiCoO_2-based$ active cathode materials are used to fabricate several coin half/full cells and their battery characteristics such as lifetime, rate capability and charge transfer resistance are then estimated, revealing quite good electrochemical performance of the LTO particles as an effective anode active material for lithium secondary batteries.

침전-증발법에 의해 제조된 리튬이온 2차 전지용 LiMn2O4 양극재료의 특성 (Characteristics of LiMn2O4 Cathode Material Prepared by Precipitation-Evaporation Method for Li-ion Secondary Battery)

  • 김국태;윤덕기;심영재
    • 한국재료학회지
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    • 제12권9호
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    • pp.712-717
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    • 2002
  • New wet chemical method so called precipitation-evaporation method was suggested for preparing spinel structure lithium manganese oxide ($LiMn_2$$O_4$) for Li ion secondary battery. Using precipitation-evaporation method, $LiMn_2$$O_4$ cathode materials suitable for Li ion secondary batteries can be synthesized. Single spinel phase $LiMn_2$$O_4$ powder was synthesized at lower temperature compared to that of prepared by solid-state method. $LiMn_2$$O_4$ powder prepared by precipitation-evaporation method showed uniform, small size and well defined crystallinity particles. Li ion secondary battery using $LiMn_2$$O_4$ as cathode materials prepared by precipitation-evaporation method and calcined at $800^{\circ}C$ showed discharge capacity of 106.03mAh/g and discharge capacity of 95.60mAh/g at 10th cycle. Although Li ion secondary battery showed somewhat smaller initial capacity but good cyclic ability. It is suggested that electro-chemical properties can be improved by controlling particle characteristics by particle morphology modification during calcination and optimizing Li ion secondary battery assembly conditions.

은 담지한 혹연을 부극 활물질로 이용한 Li ion 2차전지의 전기화학적 특성 연구 (The Electrochemical properties of Lithium ion Secondary Battery using Ag-deposited graphite anode)

  • 김상필;조정수;박정후;윤문수
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 1998년도 춘계학술대회 논문집
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    • pp.387-390
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    • 1998
  • New Ag-deposited graphite anodes were developed using wet chemical reduction methods for depositing Ag metal onto graphite particles. In this paper, we investigated X-ray diffraction pattern and charge-discharge behavior for Ag-deposited graphite anode. The Lithium ion cello using Ag-deposited graphite anode showed a high average discharge voltage of 3.6∼3.W and a excellent cycle ability than that of conventional graphite. Little capacity loss in this battery may be due to the highly durable Ag-deposited graphite anodes.

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등가물성 및 집중용량법을 이용한 리튬-이온 전지의 열해석 (Thermal Analysis of Lithium-ion Cell Using Equivalent Properties and Lumped Capacitance Method)

  • 이희원;박일석
    • 대한기계학회논문집B
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    • 제37권8호
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    • pp.775-780
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    • 2013
  • 일반적으로 전기자동차(Electric Vehicle, EV)의 배터리로는 리튬-이온 전지가 많이 사용된다. 리튬-이온 전지는 충전이 가능한 이차 전지의 일종으로 마이크로 스케일의 극판과 분리막이 반복하여 적층된 구조를 가지고 있다. 이와 같은 미세구조로 인해 상세해석모형을 적용하는 것은 지나치게 많은 비용이 소모되는 일이다. 본 연구에서는 리튬-이온 전지를 하나의 등가물성으로 나타내는 방법을 제시하고 있으며, 185.3Ah 전지와 20Ah 전지에 이를 적용하여 그 결과를 이전자료와 비교하고 있다. 또한 집중용량법을 적용한 계산 결과를 함께 제시하여 유한요소법(FEM)이나 유한체적법(FVM)의 사용 없이 손쉽게 전지의 열적 거동을 확인할 수 있는 방법을 제시하였다.