• Title, Summary, Keyword: Lithium Secondary Battery

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The electrochemical Characteristics on the Anode Material of Lithium Ion Secondary Batteries with Discharge Voltage (방전전압에 따른 리튬 이온 2차전지용 음극물질의 전기화학적 특성)

  • Park, Jong-Gwang;Han, Tae-Hui;Jeong, Dong-Cheol;Im, Seong-Hun;Han, Byeong-Seong
    • The Transactions of the Korean Institute of Electrical Engineers C
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    • v.49 no.6
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    • pp.328-334
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    • 2000
  • A lithium ion secondary battery using carbon as a negative electrode has been developed. Further improvements to increase the cell capacity are expected by modifying the structure of the carbonaceous material. There are hopes for the development of large capacity lithium ion secondary batteries with long cycle, high energy density, high power density, and high energy efficiency. In the present paper, needle cokes from petroleum were examined as an anode of lithium ion secondary battery. Petroleum cokes, MCL(Molten Caustic Leaching) treated in Korea Institute Energy Research, were carbonized at various temperatures of 0, 500, 700, $19700^{\circ}C$ at heating rate of $2^{\circ}C$/min for lh. The electrolyte was used lM liPF6 EC/DEC (1:1). The voltage range of charge & discharge was 0.0V(0.05V) ~ 2.0V. The treated petroleum coke at $700^{\circ}C$ had an initial capacity over 560mAh.g which beyond the theoretical maximum capacity, 372mAh/g for LiC6. This phenomena suggests that carbon materials with disordered structure had higher cell capacity than that the graphitic carbon materials.

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Impedance Estimation for Lithium Secondary Battery According to 1D Thermal Modeling (리튬 2차 전지의 1차원 열적 특성을 고려한 임피던스예측)

  • Lee, Jung-Su;Lim, Geun-Wook;Kim, Kwang-Sun;Cho, Hyun-Chan;Yoo, Sang-Gil
    • Journal of the Semiconductor & Display Technology
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    • v.7 no.2
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    • pp.13-17
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    • 2008
  • In this paper, in order to get the characteristics of the lithium secondary cell, such as charge and discharge characteristic, temperature characteristic, self-discharge characteristic and the capacity recovery rate etc, we build a thermal model that estimate the impedance of battery by experiment & simulation. In this one-dimensional model, Seven governing equations are made to solve seven variables c, $c_s,\;\Phi_1,\;\Phi_2,\;i_2$, j and T. The thermal model parameters used in this model have been adjusted according to the experimental data measured in the laboratory. The result(Voc, Impedance) of this research can be used in BMS(Battery Management System), so an efficient method of using battery is developed.

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Electrochemical Properties of Coal Tar Pitch based MCMB

  • Suh, Jeong-Kwon;Hong, Ji-Sook;Lee, Jung-Min
    • Carbon letters
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    • v.5 no.3
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    • pp.118-126
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    • 2004
  • MCMB (Mesocarbon microbeads) is a kind of anode material for lithium-ion secondary battery. MCMB charge/discharge cycle stability is one of the important criterion at lithium-ion battery operation. In this study, the cycling stability of a lithium-ion secondary battery has been examined. MCMB was made by the direct solvent extraction method. After the MCMB was carbonized and graphitized, the measurement of charge/discharge capacity and efficiency were carried out. In the result, discharge capacity of MCMB in the initial cycle was above 290.0 mAh/g. After the second cycle, efficiency of charge/discharge MCMB was about 98%. These results were similar to the commercial MCMB product.

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The Effect of Inorganic Material in Polymer Electrolyte for Lithium Secondary Battery (리튬이차전지용 고분전해질의 무기물의 첨가에 대한 영향)

  • Park, Soo-Gil;Park, Jong-Eun;Lee, Hong-Ki;Lee, Ju-Seong
    • Proceedings of the KIEE Conference
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    • pp.822-824
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    • 1998
  • The lithium polymer 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 point of the secondary battery system. The new type of polymer electrolyte was prepared under a dry Ar atmosphere by dissolving $LiCIO_4$ in a matrix of EC, PC and then dispersing polyacrylonitrile(PAN). Also adding some inorganic filler $Al_2O_3$. The dispersed solution heated at $120^{\circ}C$. The polymer electrolyte were characterized by EIS(Electrochemical Impedance Spectroscopy), TGA(Thermo Gravimetric analysis), DMA(Dynamic Mechanical Analyzer), DSC (Differential Scanning Calorimetry). The lithium ion yield is 0.29 when PAN-$Al_2O_3$ which was applied DC 5mV. The ionic conductivity of PAN, PAN-$Al_2O_3$ polymer electrolytes were showed $1.0{\times}10^{-4}S/cm$, $8.4{\times}10^{-4}S/cm$ at room temperature. When inorganic filler was added in the polymer electrolyte, ionic conductivity and lithium yield more larger than without inorganic filler.

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A Study on Optimal Operation Strategy for Mild Hybrid Electric Vehicle Based on Hybrid Energy Storage System

  • Bae, SunHo;Park, Jung-Wook
    • Journal of Electrical Engineering and Technology
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    • v.13 no.2
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    • pp.631-636
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    • 2018
  • This paper proposed an optimal operation strategy for a hybrid energy storage system (HESS) with a lithium-ion battery and lead-acid battery for mild hybrid electric vehicles (mild HEVs). The proposed mild HEV system is targeted to mount the electric motor and the battery to a conventional internal combustion engine vehicle. Because the proposed mild HEV includes the motor and energy storage device of small capacity, the system focuses on low system cost and small size. To overcome these limitations, it is necessary to use a lead acid battery which is used for a vehicle. Thus, it is possible to use more energy using HESS with a lithium battery and a lead storage battery. The HESS, which combines the lithium-ion battery and the secondary battery in parallel, can achieve better performance by using the two types of energy storage systems with different characteristics. However, the system requires an operation strategy because accurate and selective control of the batteries for each situation is necessary. In this paper, an optimal operation strategy is proposed considering characteristics of each energy storage system, state-of-charge (SOC), bidirectional converters, the desired output power, and driving conditions in the mild HEV system. The performance of the proposed system is evaluated through several case studies with respect to energy capacity, SOC, battery characteristic, and system efficiency.

Fabrication and Characterization of Sn1-xSixO2 Anode for Lithium Secondary Battery by R.F. Magnetron Sputtering Method (R.F. Magnetron Sputtering을 이용한 리튬이차전지 부극용 Sn1-xSixO2의 제조 및 특성)

  • Lee, Sang-Heon;Park, Keun-Tae;Son, Young-Guk
    • Journal of the Korean Ceramic Society
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    • v.39 no.4
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    • pp.394-400
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    • 2002
  • Tin oxide thin films doped with silicon as anodes for lithium secondary battery were fabricated by R. F. magnetron sputtering technique. The electrochemical results for lithium secondary battery anodes showed that addition of silicon decreases the oxidic state of tin, and, hence, reduced the irreversible capacity during the first discharge/charge cycle. The (110),(101),(211) planes were grown with increasing substrate temperatures. The reversible capacity of thin films fabricated in conditions of $300^{\circ}C$ substrate temperature and 7:3 $Ar:O_2$ ratio was 700 mAh/g.

Research Review of Sodium and Sodium Ion Battery (나트륨을 활용한 이차전지 연구동향)

  • Ryu, Cheol-Hwi;Kang, Seong-Gu;Kim, Jin-Bae;Hwang, Gab-Jin
    • Transactions of the Korean hydrogen and new energy society
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    • v.26 no.1
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    • pp.54-63
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    • 2015
  • The secondary battery using sodium is investigating as one of power storage system and power in electric vehicles. The secondary battery using sodium as a sodium battery and sodium ion battery had merits such as a abundant resources, high energy density and safety. Sodium battery (sodium molten salt battery) is operated at lower temperature ($100^{\circ}C$) compared to NAS and ZEBRA battery ($300{\sim}350^{\circ}C$). Sodium ion battery is investigating as one of the post lithium ion battery. In this paper, it is explained for the principle and recent research trends in sodium molten salt and sodium ion battery.

Electrochemical Characteristics of Porous Modified Silicon Impregnated with Metal as Anode Materials for Lithium Secondary Batteries (리튬 이차전지용 금속이 담지된 다공성 실리콘 음극물질의 전기화학적 특성)

  • Jang, Eun-Jung;Jeon, Bup-Ju
    • Transactions of the Korean hydrogen and new energy society
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    • v.23 no.4
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    • pp.353-363
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    • 2012
  • The relationship between the diffusivity and electrochemical characteristics of lithium secondary battery with the modified Si anode material prepared in HF/$AgNO_3$ solution was investigated. The crystallographic structure and images of the modified porous Si and modified Si/Cu was examined using the X-ray diffraction, BET and SEM. To examine the effect of metal composite and pore size distribution according to chemical etching on the electrochemical characterization, the electrodes for half cells were prepared with the modified Si, modified Si/Cu, and modified Si/Cu annealed with $600^{\circ}C$. Our results showed that the chemical diffusivity of lithium ions was related to structure and resistance of Si/Cu composite anode material. The lithium diffusivity in modified silicon compound calculated from the CV was at the range of $1{\times}10^{-12}$ to $9{\times}10^{-16}cm^2/s$. The effects of modified silicon structure and resistance on the cycling efficiency were significant.

Electrochemical Behavior of Si/Cu/Graphite Composite Anode for Lithium Secondary Battery (리튬이차전지용 Si/Cu/Graphite 복합체 음극의 전기화학적 거동)

  • Kim, Hyung-Sun;Chung, Kyung-Yoon;Cho, Won-Il;Cho, Byung-Won
    • Journal of the Korean Electrochemical Society
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    • v.12 no.2
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    • pp.162-166
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    • 2009
  • The carbon-coated Si/Cu powders were synthesized by mechanical ball-milling and hydrocarbon gas decomposition methods at high temperature. The carbon-coated Si/Cu powder was used as anode for lithium secondary battery and its electrochemical behavior was investigated. In addition, the carbon-coated Si/Cu/graphite composite anode material was prepared using natural graphite powder and their electrochemical characteristics were compared with natural graphite anode. The specific capacity of carbon-coated Si/Cu anode increased to the initial 10 cycles. The carbon-coated Si/Cu/graphite composite anode exhibited the reversible specific capacity of 450mAh/g and the first cycle efficiency of 81.3% at $0.25mA/cm^2$. The cycling performance of the composite anode was similar to that of pure graphite anode except the reversible specific capacity value.

The Electrical Characteristic of Composite Film for Lithium Secondary Battery by adding DMSO (DMSO 첨가에 따른 리튬이차전지용 복합필름의 전기적 특성)

  • 박수길;김종진;이창진;김상욱;김현후;임기조;이주성
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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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.

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