• Title/Summary/Keyword: 전해조

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Characteristics of Lithium Metal Secondary Battery Using PAN Gel-electrolyte Mixed with TiO2 Ceramic Filler (TiO2 Ceramic Filler가 혼합된 젤상의 PAN 고분자 전해질을 이용한 리튬금속 이차전지의 특성)

  • Lim, Hyo-Sung;Kim, Hyung-Sun;Cho, Byung-Won;Lee, Tae-Hee
    • Journal of the Korean Electrochemical Society
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    • v.5 no.3
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    • pp.106-110
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    • 2002
  • Gel-type polyacrylonitrile(PAN) polymer electrolytes have been prepared using ethylene carbonate(EC), propylene carbonate(PC) and dimethyl carbonate(DMC) plasticizer, $LiPF_6$ salt and $TiO_2$ ceramic filler. Electrochemical properties, such as electrochemical stability, ionic conductivity and compatibility with lithium metal and mechanical properly of polymer electrolytes were investigated. Charge/discharge performance of lithium secondary battery using these polymer electrolytes were investigated. The maximum load that the polymer electrolyte resists increased about two times as a result of adding $TiO_2$ in the polymer electrolyte containing EC and PC. Polymer electrolyte containing EC, PC and $TiO_2$ also showed ionic conductivity of $2\times10^{-3} S/cm$ at room temperature and electrochemical stability window up to 와 4.5V. Polymer electrolyte containing EC, PC, and $TiO_2$ showed the most stable interfacial resistance of $130\Omega$ during 20 days in the impedance spectra of the cells which were constructed by lithium metals as electrodes. Lithium metal secondary battery which employed $LiCoO_2$ cathode, lithium metal anode and $TiO_2$-dispersed polymer electrolyte showed $90\%$ of charge/discharge efficiency at the 1C rate of discharge.

A study on the channel design of bipolar plate of electrolytic cell by flow dynamic simulation in the two phase flow system (2상 흐름계에서 유로설계에 따른 전해조 분리판의 전산모사 연구)

  • Jo, Hyeon-Hak;Jang, Bong-Jae;Song, Ju-Yeong
    • Journal of the Korean Applied Science and Technology
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    • v.27 no.4
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    • pp.415-420
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    • 2010
  • This study is focused on the channel design of bipolar plate in the electrode of hydrogen gas generator. The characteristics of hydrogen gas generation was studied in view of efficiency of hydrogen gas generation rate and a tendency of gas flow through the riv design of electrode. Since the flow rate and flow pattern of generated gas in the two phase flow system are the most crucial in determining the efficiency of hydrogen gas generator, we adopted the commercial analytical program of COMSOL MultiphysicsTM to calculate the theoretical flow rate of hydrogen gas from the outlet of gas generator and flow pattern of two phase fluid in the electrode. In this study, liquid electrolyte flows into the bipolar plate and decomposed into gas phase, two phase flow simulation is applied to measure the efficiency of hydrogen gas generation.

A Study on the Stable Operation of High Sodium Hypochlorite Generation (고농도 차아염소산나트륨 발생장치의 안정적 운영에 관한 연구)

  • Cho, Haejin;Na, Chanwook;Ko, Sungho
    • The KSFM Journal of Fluid Machinery
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    • v.20 no.2
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    • pp.69-74
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    • 2017
  • Sodium hypochlorite, used as water disinfectant, is generated by electrolysis of salt. Compared to chlorine gas disinfection, it is free from high-pressure gas regulation and does not generate toxic gas, so it is increasingly used as a safe disinfectant. Despite these advantages, the concentration of sodium hypochlorite decreases with temperature during long-term storage, and the amount of chlorate increases when a large amount is added, it has mainly been applied to small-scale waterworks. To solve this problem, high sodium hypochlorite generation was developed. In this study, the changes of concentration and chlorate of sodium hypochlorite with time has been studied. As a result of the test, it was found that the usable period of sodium hypochlorite produced at a certain temperature or less was increased from 1.5 days to 13 days. Overall, sodium hypochlorite can be applied even in large-scale waterworks, which makes operation more stable and also reduces the disinfection byproducts, thus it contributed greatly to securing water quality.

Role of Electrode Reaction of Electrolyte in Electrokinetic-Fenton Process for Phenanthrene Removal (동전기-펜턴 공정에서 전해질의 전극반응이 처리효율에 미치는 영향)

  • Park Ji-Yeon;Kim Sang-Joon;Lee You-Jin;Yang Ji-Won
    • Journal of Soil and Groundwater Environment
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    • v.11 no.1
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    • pp.7-13
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    • 2006
  • The effects of electrolytes were investigated on the removal efficiency when several different electrolytes were used to change the electrode reaction in an electrokinetic (EK)-Fenton process to remediate phenanthrene-contaminated soil. Electrical potential gradient decreased initially due to the ion entrance into soil and then increased due to the ion extraction from soil under the electric field. Accumulated electroosmotic flow was $NaCl>KH_2PO_4>MgSO_4$ at the same concentration because the ionic strength of $MgSO_4$ was the highest and $Mg(OH)_2$ formed near the cathode reservoir plugged up soil pore to inhibit water flow. When hydrogen peroxide was contained in electrolyte solution, removal efficiency increased by Fenton reaction. When NaCl was used as an electrolyte compound, chlorine ($Cl_2$) was generated at the anode and dissolved to form hypochlorous acid (HClO), which increased phenanthrene removal. Therefore, the electrode reaction of electrolyte in the anode reservoir as well as its transport into soil should be considered to improve removal efficiency of EK-Fenton process.