• Title, Summary, Keyword: Electrode binder

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Fabrication of CMC+PTFE Electrode and it's Electrochemical Performances (CMC+PTFE 혼합바인더 전극의 제조 및 전기화학적 특성)

  • Kim, Ick-Jun;Lee, Sun-Young;Moon, Seong-In
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.1248-1253
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    • 2004
  • This work describes the effect of electrode binder on the characteristics of electric double layer capacitor Among carboxymethylcellulose (CMC), Polyvinylpyrrolidone (PVP), Polyvinyl Alcohol (PVA), and Polyvinylidene Fluoride (PVDF), the unit cell using CMC showed good rate capability between $2.5mA/cm^2{\sim}100mA/cm^2$ current density. However, CMC as a binder is incongruent, because the electrode bound with CMC is rigid and easy to crack during a press and winding process for fabrication of capacitor. The unit cell capacitor using the electrode bound with binary binder composed of CMC and Polytetrafluoroethylene (PTFE), especially in composition CMC : PTFE : 60 : 40 wt.%, has exhibited the better mechanical properties than those of the unit cell with CMC. On the other hand, it was also noted that the mechanical properties of CMC+PTFE electrode, coated on underlayer composed of CMC and carbon black, were much improved the binding force.

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Electrochemical Properties of Carbon Nanofiber Electrode with Different PVDF Binder Concentration (PVDF 접합제 농도 변화와 탄소나노섬유 전극의 전기화학적 특성)

  • Choi, Weon-Kyung;Cho, Tae-Hwan
    • Transactions of the Korean hydrogen and new energy society
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    • v.18 no.4
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    • pp.446-451
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    • 2007
  • Physicochemical properties of carbon nanofibers were evaluated as a supercacitor electrode materials could store electrochemical energy reversibly. A capacitance of carbon nanofiber electrode was increased gradually, depending on the PVDF binder ratio. A feasibility of EDLC electrode was estimated with specific surface area measurement by BET method and mesopore structure of carbon nanofiber surface could be explained electrochemical absorption-desorption in aqueous electrolyte. PVDF 5 wt.% ratio in electrode was observed a suitable binder amount by CV result.

Effects by Changing Binder Contents in The Carbon Counter Electrode for Dye-sensitized Solar Cells (염료감응형 태양전지의 탄소대항전극 제조시 바인더에 따른 영향)

  • Kim, Seong-Jun;Kwon, Jung-Youl;Lee, Hyeon-Seok;Park, Jung-Cheul;Lee, Heon-Yong
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.114-115
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    • 2006
  • In the present study we investigated effects by changing binder contents m the carbon counter electrode for dye-sensitized solar cells. Binder contents changed for 6 wt%, 7 wt%, 8 wt% before making carbon electrode. In the result of the measurement the specific resistance for 6 wt% was lowest among others And the surface of the carbon electrode which was measured by SEM was best m the 6 wt"%. The electrode properties be showing in an experiment were due to increment of surface roughness that appeared the carbon electrode, which decreased internal surface area.

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Electric and Mechanical Properties of CMC+PTFE Binary Binder Electrode for Electric Double Layer Capacitor (EDLC용 CMC+PTFE 혼합바인더 전극의 전기적, 기계적 특성)

  • Kim, Ick-Jun;Lee, Sun-Young;Moon, Seong-In
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.17 no.10
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    • pp.1079-1084
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    • 2004
  • This work describes the effect of electrode binder on the characteristics of electric double layer capacitor. Among carboxymethylcellulose (CMC), Polyvinylpyrrolidone (PVP), Polyvinyl Alcohol (PVA), and Polyvinylidene Fluoride (PVDF), the unit cell using CMC showed good rate capability at current densities between 2.5 mA/$\textrm{cm}^2$~100 mA/$\textrm{cm}^2$. However, CMC as a binder is incongruent, because the electrode bound with CMC is rigid and easy to crack during a press and winding process for fabrication of capacitor. The unit cell capacitor using the electrode bound with binary binder composed of CMC and Polytetrafluoroethylene (PTFE), especially in composition CMC : PTFE =60 : 40 wt.%, has exhibited the better mechanical properties than those of the unit cell with CMC. On the other hand, the mechanical properties of CMC+PTFE electrode, coated on underlayer composed of CMC and carbon black, were much improved.

Fabrication of Low Temperature Cofired Ceramic (LTCC) Chip Couplers for High Frequencies : I, Effects of Binder Burnout Process on the Formation of Electrode Line (고주파용 저온 동시소성 세라믹(LTCC)칩 커플러 제조: I. 전극형성에 대한 결합제 분해공정의 영향)

  • 조남태;심광보;이선우;구기덕
    • Journal of the Korean Ceramic Society
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    • v.36 no.6
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    • pp.583-589
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    • 1999
  • In the fabrication of ceramic chip couples for high frequency application such as the mobile communication equipment the formation of electrode lines and Ag diffusion were investigated with heat treatment conditions for removing organic binders. The deformation and densification of the electrode line greatly depended on the binder burnout process due to the overlapped temperature zone near 400$^{\circ}C$ of the binder dissociation and the solid phase sintering of the silver electrode. Ag ions were diffused into the glass ceramic substrate. The Ag diffusion was led by the glassy phase containing Pb ions rather than by the crystalline phase containing Ca ions. The fact suggests that the Ag diffusion could be controlled by managing the composition of the glass ceramic substrate.

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Determination of Properties of Ionomer Binder Using a Porous Plug Model for Preparation of Electrodes of Membrane-Electrode Assemblies for Polymer Electrolyte Fuel Cells

  • Park, Jin-Soo;Park, Seok-Hee;Park, Gu-Gon;Lee, Won-Yong;Kim, Chang-Soo;Moon, Seung-Hyeon
    • Journal of the Korean Electrochemical Society
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    • v.10 no.4
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    • pp.295-300
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    • 2007
  • A new characterization method using a porous plug model was proposed to determine the degree of sulfonation (DS) of ionomer binder with respect to the membrane used in membrane-electrode assemblies (MEAs) and to analyze the fraction of proton pathways through ionomer-catalyst combined electrodes in MEAs for polymer electrolyte fuel cells (PEFCs). Sulfonated poly(ether ether ketone) was prepared to use a polymeric electrolyte and laboratory-made SPEEK solution (5wt.%, DMAc based) was added to catalyst slurry to form catalyst layers. In case of the SPEEK-based MEAs in this study, DS of ionomer binder for catalyst layers should be the same or higher than that of the SPEEK membrane used in the MEAs. The porous plug model suggested that most of protons were via the ionomer binder (${\sim}92.5%$) bridging the catalyst surface to the polymeric electrolyte, compared with the pathways through the alternative between the interstitial water on the surface of ionomer binder or catalyst and the ionomer binder (${\sim}7.3%$) and through only the interstitial water on the surface of ionomer or catalyst (${\sim}0.2%$) in the electrode of the MEA comprising of the sulfonated poly(ether ether ketone) membrane and the 5wt.% SPEEK ionomer binder. As a result, it was believed that the majority of proton at both electrodeds moves through ionomer binder until reaching to electrolyte membrane. The porous plug model of the electrodes of MEAs reemphasized the importance of well-optimized structure of ionomer binder and catalyst for fuel cells.

Characterization and fabrication of one component solution based CNT/epoxy binder conductive films (일액형 탄소나노튜브/에폭시 바인더 코팅액을 이용한 전도성 필름 제조 및 특성 분석)

  • Han, Joong-Tark;Woo, Jong-Seok;Kim, Sun-Young;Lee, Geon-Woong
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.455-456
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    • 2007
  • Optically transparent, highly conductive coating have been major theme of thin film science efforts for some years. In this work, t-MWNT(thin Multi-walled Carbon Nanotubes) are acid treated, then the stable dispersion of t-MWNTs in polar solvent such as alcohols, was achieved by sonication. The transparent conducting films are prepared using the one component solution of t-MWNT/epoxy binder via spray coating on glass substrate. The characterization of acid treated t-MWNTs was performed by Raman spectrometer. The opto-electrical properties of conducting films are analyzed by the binder concentration, and the effect of co-solvent on the compatibility and dispersibility of one component t-MWNT/epoxy binder solutions are discussed.

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Effect of the spirobiindane group in sulfonated poly(arylene ether sulfone) copolymer as electrode binder for polymer electrolyte membrane fuel cells

  • Chae, Ji Eon;Kim, Bo Hyun;Noh, Jee Hyun;Jung, Jaewoo;Kim, Jin-Young;Jang, Jong Hyun;Yoo, Sung Jong;Kim, Hyoung-Juhn;Lee, So Young
    • Journal of Industrial and Engineering Chemistry
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    • v.47
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    • pp.315-322
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    • 2017
  • Electrode properties determine the membrane-electrode assembly (MEA) performance of fuel cells and are influenced by the materials and processing. A high-performance electrode requires good adhesion between the membrane and catalyst, excellent gas permeability, and good ion conduction. Here, sulfonated poly(arylene ether sulfone) (SPAES) containing a bulky spirobiindane (Spiro) group is proposed as a new hydrocarbon electrode binder for MEAs. The effect of the Spiro group on MEA performance was compared to that of the common biphenylsulfone. The structural differences between the two binders affected the mass transport region of the current-voltage polarization (related to gas permeation). The spiro-polyethersulfone (PES) had 115 times higher $O_2$ permeability (30 Barrer) than that of PES. From $^1H\;NMR$ spectra, the degree of sulfonation (DS) of each SPAES was confirmed, where the proton conductivity of Spiro 30, Spiro 20, and BPS 30 were 28.2, 10.1, and $26.9mS\;cm^{-1}$, respectively. In addition, the DS of the electrode binder contributed to the Ohmic region of the i-V curve. The Ohmic resistance of these hydrocarbon binders was similar to that of commercial Nafion binder ($0.13-0.15{\Omega}cm^2$). However, the charge transfer resistance of our binders was higher than that of Nafion due to insufficient gas permeability and low proton conductivity.

Effect of Auxetic Structure of PVdF on Tin Anode Stability for Na-ion Batteries (소듐 이온전지용 주석 음극의 안정화를 위한 PVdF 옥세틱 구조의 영향)

  • Park, Jinsoo
    • Journal of Korean Powder Metallurgy Institute
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    • v.25 no.6
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    • pp.507-513
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    • 2018
  • This study investigates the viability of using a Na-ion battery with a tin(Sn) anode to mitigate the vulnerability caused by volume changes during discharge and charge cycling. In general, the volume changes of carbon material do not cause any instability during intercalation into its layer structure. Sn has a high theoretical capacity of $847mAh\;g^{-1}$. However, it expands dramatically in the discharge process by alloying Na-Sn, placing the electrode under massive internal stress, and particularly straining the binder over the elastic limit. The repeating strain results in loss of active material and its electric contact, as well as capacity decrease. This paper expands the scope of fabrication of Na-ion batteries with Sn by fabricating the binder as an auxetic structure with a unique feature: a negative Poisson ratio (NPR), which increases the resistance to internal stress in the Na-Sn alloying/de-alloying processes. Electrochemical tests and micrograph images of auxetic and common binders are used to compare dimensional and structural differences. Results show that the capacity of an auxetic-structured Sn electrode is much larger than that of a Sn electrode with a common-structured binder. Furthermore, using an auxetic structured Sn electrode, stability in discharge and charge cycling is obtained.

Performance of Direct Methanol Fuel Cell (DMFC) based on New Electrode Binder (sPEEK/Nafion): Effect of Binder Content (새로운 전극 바인더(sPEEK/Nafion)를 도입한 직접 메탄올 연료전지의 성능 : 바인더 함량의 영향)

  • Jung, Ho-Young;Park, Jung-Ki
    • Korean Chemical Engineering Research
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    • v.45 no.4
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    • pp.391-395
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    • 2007
  • A new electrode binder mixed with sulfonated poly (ether ether ketone) (sPEEK) and Nafion is prepared and investigated as an anode binder for direct methanol fuel cell (DMFC). The mixed binder (95 wt% sPEEK/5 wt% Nafion) shows high proton conductivity and methanol transport rate as well as no dissolution and brittleness. The effect of content as an anode binder on the performance of the cell with the given cathode is investigated. The unit cell with the anode containing 10wt% mixed binder showed the highest cell performance.