• Title, Summary, Keyword: Electrolyte Additive

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High Performance Electrode of Polymer Electrolyte Membrane Fuel Cells Prepared by Direct Screen Printing Process (직접 스크린 프린팅법으로 제조된 고분자 전해질 연료전지의 고성능 전극)

  • 임재욱;최대규;류호진
    • Journal of the Microelectronics and Packaging Society
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    • v.11 no.1
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    • pp.65-69
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    • 2004
  • Screen printing it one of the most popular methods for the fabrication of catalytic layer in electrode of polymer electrolyte membrane fuel cells (PEMFCs) due to its convenience and adaptability. This paper suggests an improved screen-printing method, which is rather simple suppressing the swelling trouble without additive process and competitive with very low Pt loading in comparison with the previous methods. Particularly, the gasket unified MEA made better performances than the other especially at high current area due to blocking effect on the gas leakage during the operation. These methods give us more simplified and faster fabrication chances.

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Electrochemical Characteristics of Electrolyte Additives and Nano-Pb/AC Anode for Ultra Batteries (울트라 배터리 용 전해액 첨가제와 Nano-Pb/AC 음극의 전기화학적 특성)

  • Kim, Geun Joong;Lee, Jong Dae
    • Applied Chemistry for Engineering
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    • v.29 no.5
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    • pp.549-555
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    • 2018
  • In this study, the electrochemical properties of nano-Pb/activated carbon (nano-Pb/AC) composites and electrolyte additives were examined to improve the performance of ultra batteries. Physical properties of the prepared nano-Pb/AC composites were analyzed using FE-SEM, TEM, XPS and BET. The electrochemical performances of ultra batteries were performed by cycle, rate performance and impedance tests. The cycling performance of nano-Pb/AC (Pb : 9 wt%) coated ultra battery increased by 150% with respect to the lead acid one, and the discharge specific capacity increased by 119-122% for 1-5 C rate tests. As a result of the impedance test, it was confirmed that the internal resistance decreased as the nano lead content increased. The cycle performance of the ultra battery containing 0.45 vol% electrolyte additives showed 140% longer than that of no electrolyte additives.

Potentials of Additive Manufacturing with Smart Materials for Chemical Biomarkers in Wearable Applications

  • Kwon, JuYoun;Park, Hyung Wook;Park, Young-Bin;Kim, Namhun
    • International Journal of Precision Engineering and Manufacturing-Green Technology
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    • v.4 no.3
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    • pp.335-347
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    • 2017
  • In this paper, recent technology for wearables to detect electrolyte of sweat and biocompatible smart materials for additive manufacturing (AM) have been surveyed. The challenges and gaps toward successful realization of functional wearable devices as a kit to test biomarkers were, then, discussed. While wearable devices sensing physical conditions of users are popular in a consumer market, wearable devices to detect chemical components of human sweat have little studied due to several limitations such as contacting human skin and controlling ambient parameters etc. AM technology makes innovative products realized, differing from conventional fabrication and design methodologies due to unlimited design freedom for manufacturing and material selections. We investigate the potentials of AM to be applied for wearable devices, although detecting chemical biofluids requires wider and deeper researches on the development of advanced materials and AM process.

Market and Technology Analysis for Organic Electrolyte Additive of Lithium Battery (이차전지 유기 전해질 첨가제 시장 및 기술 분석)

  • Lee, Jongtaik
    • Proceedings of the Korea Contents Association Conference
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    • pp.407-408
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    • 2014
  • 유기 전해액 성능에 따라 고에너지 밀도, 장수명, 안전성의 특징에 영향을 미치므로 전해액 첨가제에 대한 연구가 활발하게 진행되고 있다. 국내외적으로 각각 7.7%, 6.2%의 연평균 성장률을 가질 것으로 예상되고 있다. 전해액을 포함한 관련 소재는 일본을 중심으로 성장해 왔으나, 최근 국내 이차전지 산업 발전에 따라 원천 기술 확보를 통한 주요 소재 국산화 대체가 시급하다. 이에 따라, 파낙스이텍, 솔브레인, 천보 등을 중심으로 국내 기업의 전해칠 첨가제 개발이 활발히 진행 중이다.

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Magnetic Properties of Thin Cu/Co Multilayers Made by Electrodeposition

  • Lee, Jung-Ju;Lee, Jin-Han;Hong, Kim-In
    • Journal of Magnetics
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    • v.10 no.3
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    • pp.118-121
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    • 2005
  • We have investigated the magnetic properties of electroplated thin Cu/Co multilayers by using electrolytes made of copper sulphate and cobalt sulphate and by applying alternating plating voltage. While the multilayers plated with pure electrolyte showed superparamagnetism, those plated with organic additives showed ferromagnetic behavior. These changes are attributed to the so-called 'self-annealing' effect and reduction of grain size caused by the organic additives.

Extending the Self-ordering Regime of High-field Anodization by Using an Electrolyte Additive (전해액 첨가제를 이용한 고전계 양극산화의 자기정렬에 관한 연구)

  • Kim, Min-Woo;Park, Seong-Soo;Sim, Seong-Ju;Kang, Tae-Ho;Shin, Yong-Bong;Ha, Yoon-Cheol
    • Journal of the Korean Electrochemical Society
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    • v.14 no.4
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    • pp.219-224
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    • 2011
  • Using an electrolyte additive, we examined, for the first time, a novel self-ordering regime of 160~200 V in high-field anodization which had been used for a fast fabrication of self-ordered anodic alumina nanotemplate. FE-SEM analyses conducted after the high-field anodization, pulse detachment and chemical widening of pores showed the relationship of 2.2 nm/V in this voltage range, which was identical to the previously reported one in the literature. The growth rate of the alumina film was about 60 um/hr, which was 30 times faster than that of phosphoric acid mild anodization. This study provides a new process for the fast fabrication of nanotemplates with interpore distances larger than 300 nm.

Electrodeposition of Copper on Porous Reticular Cathode (II) - Effect of PEG and MPS on throwing Power- (다공성 그물구조 음극을 이용한 구리 전착에 관한 연구 (II) -유기첨가제 PEG, MPS의 영향 -)

  • Lee Kwan Hyi;Lee Hwa Young;Jeung Won Young
    • Journal of the Korean Electrochemical Society
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    • v.4 no.2
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    • pp.41-46
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    • 2001
  • The effect of organic additives such as PEG ind MPS on throwing power have been studied in the fabrication of porous reticular metal by electrodeposition using the mixture of cupric sulfate and sulfuric acid as electrolyte. Both the polarization test and the electrodeposition on the stacked electrodes, mean pore diameter of which was $250{\mu}m$, were performed to illustrate the behavior of throwing power quantitatively. As far as PEG was concerned, it lowered throwing power of electrodeposition on the porous electrode used in this work while the addition of MPS up to 500 ppm in electrolyte enhanced throwing power monotonously. When both MPS and PEG were added in electrolyte, the effect of MPS on throwing power was superior to that of PEG. However, the excess addition of MPS was found to cause the defect in mechanical strength of deposit layer. From the result of SEM observation, it could be concluded that less than 50 ppm of MPS in electrolyte was appropriate to avoid the breakage of deposit layer.

Surface Treatment Effect on Electrochemical characteristics of Al Alloy for ship

  • Lee, Seung-Jun;Kim, Seong-Jong
    • Proceedings of the Korean Institute of Surface Engineering Conference
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    • pp.149-149
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    • 2017
  • Aluminum alloys have poor corrosion resistance compared to the pure aluminum due to the additive elements. Thus, anodizing technology artificially generating thick oxide films are widely applied nowadays in order to improve corrosion resistance. Anodizing is one of the surface modification techniques, which is commercially applicable to a large surface at a low price. However, most studies up to now have focused on its commercialization with hardly any research on the assessment and improvement of the physical characteristics of the anodized films. Therefore, this study aims to select the optimum temperature of sulfuric electrolyte to perform excellent corrosion resistance in the harsh marine environment through electrochemical experiment in the seawater upon generating porous films by variating the temperatures of sulfuric electrolyte. To fabricate uniform porous film of 5083 aluminum alloy, we conducted electro-polishing under the 25 V at $5^{\circ}C$ condition for three minutes using mixed solution of ethanol (95 %) and perchloric (70 %) acid with volume ratio of 4:1. Afterward, the first step surface modification was performed using sulfuric acid as an electrolyte where the electrolyte concentration was maintained at 10 vol.% by using a jacketed beaker. For anode, 5083 aluminum alloy with thickness of 5 mm and size of $2cm{\times}2cm$ was used, while platinum electrode was used for cathode. The distance between the two was maintained at 3 cm. Anodic polarization test was performed at scan rate of 2 mV/s up to +3.0 V vs open circuit potential in natural seawater. Surface morphology was compared using 3D analysis microscope to observe the damage behavior. As a result, the case of surface modification showed a significantly lower corrosion current density than that without modification, indicating excellent corrosion resistance.

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Effect of Anodizing Current Density on Anti-Corrosion Characteristics for Al2O3 Oxide Film (Al2O3 산화 피막의 내식성에 미치는 양극산화 전류밀도의 영향)

  • Lee, Seung-Jun;Jang, Seok-Gi;Kim, Seong-Jong
    • Proceedings of the Korean Institute of Surface Engineering Conference
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    • pp.153-153
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    • 2016
  • Aluminum alloys have poor corrosion resistance compared to the pure aluminum due to the additive elements. Thus, anodizing technology artificially generating thick oxide films are widely applied nowadays in order to improve corrosion resistance. Anodizing is one of the surface modification techniques, which is commercially applicable to a large surface at a low price. However, most studies up to now have focused on its commercialization with hardly any research on the assessment and improvement of the physical characteristics of the anodized films. Therefore, this study aims to select the optimum temperature of sulfuric electrolyte to perform excellent corrosion resistance in the harsh marine environment through electrochemical experiment in the sea water upon generating porous films by variating the temperatures of sulfuric electrolyte. To fabricate uniform porous film of 5083 aluminum alloy, we conducted electro-polishing under the 25 V at $5^{\circ}C$ condition for three minutes using mixed solution of ethanol (95 %) and perchloric (70 %) acid with volume ratio of 4:1. Afterward, the first step surface modification was performed using sulfuric acid as an electrolyte where the electrolyte concentration was maintained at 10 vol.% by using a jacketed beaker. For anode, 5083 aluminum alloy with thickness of 5 mm and size of $2cm{\times}2cm$ was used, while platinum electrode was used for cathode. The distance between the two was maintained at 3 cm. Afterward, the irregular oxide film that was created in the first step surface modification was removed. For the second step surface modification process (identical to the step 1), etching was performed using mixture of chromic acid (1.8 wt.%) and phosphoric acid (6 wt.%) at $60^{\circ}C$ temperature for 30 minutes. Anodic polarization test was performed at scan rate of 2 mV/s up to +3.0 V vs open circuit potential in natural seawater. Surface morphology was compared using 3D analysis microscope to observe the damage behavior. As a result, the case of surface modification presented a significantly lower corrosion current density than that without modification, indicating excellent corrosion resistance.

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Effect of Li3BO3 Additive on Densification and Ion Conductivity of Garnet-Type Li7La3Zr2O12 Solid Electrolytes of All-Solid-State Lithium-Ion Batteries

  • Shin, Ran-Hee;Son, Sam-Ick;Lee, Sung-Min;Han, Yoon Soo;Kim, Yong Do;Ryu, Sung-Soo
    • Journal of the Korean Ceramic Society
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    • v.53 no.6
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    • pp.712-718
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    • 2016
  • In this study, we investigate the effect of the$Li_3BO_3$ additive on the densification and ionic conductivity of garnet-type $Li_7La_3Zr_2O_{12}$ solid electrolytes for all-solid-state lithium batteries. We analyze their densification behavior with the addition of $Li_3BO_3$ in the range of 2-10 wt.% by dilatometer measurements and isothermal sintering. Dilatometry analysis reveals that the sintering of $Li_7La_3Zr_2O_{12}-Li_3BO_3$ composites is characterized by two stages, resulting in two peaks, which show a significant dependence on the $Li_3BO_3$ additive content, in the shrinkage rate curves. Sintered density and total ion conductivity of the system increases with increasing $Li_3BO_3$ content. After sintering at $1100^{\circ}C$ for 8 h, the $Li_7La_3Zr_2O_{12}-8$ wt.% $Li_3BO_3$ composite shows a total ionic conductivity of $1.61{\times}10^{-5}Scm^{-1}$, while that of the pure $Li_7La_3Zr_2O_{12}$ is only $5.98{\times}10^{-6}Scm^{-1}$.