• Title/Summary/Keyword: Polymer electrolyte

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Electrochemical Properties of Novel Metal Powder Electrodes for Polymer Electrolyte Membrane Electrolysis

  • Kim, Chang-Hee;Kang, Kyung-Soo;Park, Chu-Sik;Hwang, Gab-Jin;Bae, Ki-Kwang
    • Proceedings of the Korean Powder Metallurgy Institute Conference
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    • 2006.09b
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    • pp.1227-1228
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    • 2006
  • The electrochemical properties of novel metal powders were investigated for the electrode materias of polymer electrolyte memebrane electrolysis. Two types of Pt black and $IrO_2$ powder electrodes were hot-pressed on the polymer electrolyte membrane to form membrane electrode assembly. The galvanodynamic polarization methode was used to characterize the electrochemical properties of both electrodes. From the experimental results, we concluded that the $IrO_2$ powder electrode exhibits better electrochemical performance than Pt black as cathode material for the electrolysis.

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Recent Advances in Composite Polymer Electrolyte Membranes for Fuel Cell (연료전지용 고분자 전해질 복합막의 최근 발전 동향)

  • Vijayakumar, Vijayalekshmi;Son, Tae Yang;Nam, Sang Yong
    • Applied Chemistry for Engineering
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    • v.30 no.1
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    • pp.1-10
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    • 2019
  • Composite polymer electrolyte membranes based on porous supports have been recognized as an alternative for fuel cell applications since it can provide both mechanical as well as electrochemical stabilities. This mini-review highlights recent advances in supported composite polymer electrolyte membranes using porous matrix and nanofibrous supports. In addition, a comprehensive table listing a wide range of anion and proton exchange pore filling membranes was provided at the end of the review.

Research Trends on Developments of High-performance Perfluorinated Sulfonic Acid-based Polymer Electrolyte Membranes for Polymer Electrolyte Membrane Fuel Cell Applications (고분자 전해질 막 연료전지 응용을 위한 고성능 과불소화계 전해질 막 개발 연구 동향)

  • Choi, Chanhee;Hwang, Seansoo;Kim, Kihyun
    • Membrane Journal
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    • v.32 no.5
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    • pp.292-303
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    • 2022
  • An eco-friendly energy conversion device without the emission of pollutants has gained much attention due to the rapid use of fossil fuels inducing carbon dioxide emissions ever since the first industrial revolution in the 18th century. Polymer electrolyte membrane fuel cells (PEMFCs) that can produce water during the reaction without the emission of carbon dioxide are promising devices for automotive and residential applications. As a key component of PEMFCs, polymer electrolyte membranes (PEMs) need to have high proton conductivity and physicochemical stability during the operation. Currently, perfluorinated sulfonic acid-based PEMs (PFSA-PEMs) have been commercialized and utilized in PEMFC systems. Although the PFSA-PEMs are found to meet these criteria, there is an ongoing need to improve these further, to be useful in practical PEMFC operation. In addition, the well-known drawbacks of PFSA-PEMs including low glass transition temperature and high gas crossover need to be improved. Therefore, this review focused on recent trends in the development of high-performance PFSA-PEMs in three different ways. First, control of the side chain of PFSA copolymers can effectively improve the proton conductivity and thermal stability by increasing the ion exchange capacity and polymer crystallinity. Second, the development of composite-type PFSA-PEMs is an effective way to improve proton conductivity and physical stability by incorporating organic/inorganic additives. Finally, the incorporation of porous substrates is also a promising way to develop a thin pore-filling membrane showing low membrane resistance and outstanding durability.

The Effects of Plasticizer Addition on the Conductivity of Polymer Electrolyte Based on Poly(ethylene oxide) (이온전도성 Poly(ethylene oxide) 고분자 전해질의 전도도에 미치는 가소제 첨가 효과)

  • 문성인;진봉수;김종욱;윤문수;구할본
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 1994.11a
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    • pp.82-85
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    • 1994
  • The purpose of this study is to research and develop solid polymer electrolyte(SPE) for Li secondary battery. This paper describes effects of plasticizer addition and temperature dependence of conductivity of these PEO electrolytes. Adding propylene carbonate and ethylene carbonate to PEO-LiClO$_4$electrolyte, its conductivity was higher than PEO-LiClO$_4$ itself. Steady state current method and AC impedance used for the determination of transference number in PEO electrolyte film. The transference number of PEO$\_$8/LiClO$_4$PC$\_$5/EC$\_$5/ polymer electrolyte film is 0.45 at 60$^{\circ}C$.

New Solid Polymer Electrolyte for Lithium Secondary Batteries

  • Park, Jung-Ki;Lee, Yong-Min;Lee, Jun-Young;Ryou, Myeong-Hyeon
    • Proceedings of the Polymer Society of Korea Conference
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    • 2006.10a
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    • pp.67-68
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    • 2006
  • Solid polymer electrolyte is very important in the applications to high energy density lithium batteries of high safety. In this work, solid polymer electrolytes based on PE non-woven matrix, hybrid salt, and anion receptor were successfully prepared. They could provide high ion conduction phase with maintaining mechanical strength. They also showed high electrochemical stability and lithium ion transference number. This new type of solid polymer electrolyte is expected to be a good candidate for rechargeable solid state lithium secondary batteries.

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Electrochemical Properties of Lithium-Ion Polymer Battery with PMMA IPN-Based Gel Polymer Electrolyte (PMMA IPN계 겔폴리머전해질을 채용한 리튬이온폴리머전지의 전기화학적 특성)

  • 김현수;신정한;나성환;엄승욱;문성인;김상필
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.16 no.11
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    • pp.994-1000
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    • 2003
  • In this study, gel polymer electrolytes (GPE) with semi-interpenerating network of poly (methyl methacrylate) and hexanediol dimethacrylate were synthesized and their electrochemical performances were evaluated. LiCoO$_2$/GPE/graphite cells were prepared and their performances depending on discharge currents and temperatures were evaluated. The precursor containing 5 vol% curable mixture had a low viscosity relatively. GPE showed good electrochemical stability up to potential of 4.8 V vs. Li/Li$\^$+/. Ionic conductivity of the gel polymer electrolyte at room temperature and -20$^{\circ}C$ was ca. 5.9 and 1.4${\times}$10$\^$-3/ Scm$\^$-1/, respectively. LiCoO$_2$/GPE/graphite cells showed good rate capability, low-temperature performance and cycleability.

Quasi-Solid-State Polymer Electrolytes Based on a Polymeric Ionic Liquid with High Ionic Conductivity and Enhanced Stability

  • Jeon, Nawon;Jo, Sung-Geun;Kim, Sang-Hyung;Park, Myung-Soo;Kim, Dong-Won
    • Journal of Electrochemical Science and Technology
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    • v.8 no.3
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    • pp.257-264
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    • 2017
  • A polymeric ionic liquid, poly(1-methyl 3-(2-acryloyloxypropyl) imidazolium iodide) (PMAPII), was synthesized as a single-iodide-ion-conducting polymer and employed in a gel polymer electrolyte. Gel polymer electrolytes prepared from iodine, 4-tert-butylpyridine, ${\gamma}$-butyrolactone, and PMAPII were applied in quasi-solid-state dye-sensitized solar cells (DSSCs). The addition of 16 wt.% PMAPII provided the most favorable environment, striking a compromise between the iodide ion concentration and the ionic mobility, which resulted in the highest conversion efficiency of the resulting DSSCs. The quasi-solid-state DSSC assembled with the optimized gel polymer electrolyte exhibited a relatively high conversion efficiency of 7.67% under AM 1.5 illumination at $100mA\;cm^{-2}$ and better stability than that of the DSSC with a liquid electrolyte.

The Effect of sGO Content in sPEEK/sGO Composite Membrane for Unitized Regenerative Fuel Cell (일체형 재생연료전지 적용을 위한 sGO 함량 변화에 따른 sGO/sPEEK 복합막의 특성 평가)

  • Jung, Ho-Young;Kim, Min-Woo;Lim, Ji-Hun;Choi, Jin H.;Roh, Sung-Hee
    • KEPCO Journal on Electric Power and Energy
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    • v.2 no.1
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    • pp.127-131
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    • 2016
  • Polymer electrolyte membrane for unitized regenerative fuel cells requires high proton conductivity, high dimensional stability, low permeability, and low cost. However, DuPont's Nafion which is a commercial polymer electrolyte membrane has high permeability, high cost, and decreasing proton conductivity and dimensional stability over $80^{\circ}C$. To address these problems, sulfonated poly ether ether ketone (sPEEK) which is a low cost hydrocarbon polymer is selected as matrix polymer for the preparation of polymer electrolyte membrane. In addition, composite membrane with improved proton conductivity and dimensional stability is prepared by introducing sulfonated graphene oxide (sGO). The fundamental properties of polymer electrolyte membranes are analyzed by investigating membrane's water content, dimensional stability, proton conductivity, and morphology. The cell test is conducted to consider the possibility of application of sPEEK/sGO composite membrane for an unitized regenerative fuel cell.

Analysis of electrochemical double-layer capacitors using a Natural Rubber-Zn based polymer electrolyte

  • Nanditha Rajapaksha;Kumudu S. Perera;Kamal P. Vidanapathirana
    • Advances in Energy Research
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    • v.8 no.1
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    • pp.41-57
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    • 2022
  • Electrochemical double-layer capacitors (EDLCs) based on solid polymer electrolytes (SPEs) have gained an immense recognition in the present world due to their unique properties. This study is about preparing and characterizing EDLCs using a natural rubber (NR) based SPE with natural graphite (NG) electrodes. NR electrolyte was consisted with 49% methyl grafted natural rubber (MG49) and zinc trifluoromethanesulfonate ((Zn(CF3SO3)2-ZnTF). It was characterized using electrochemical impedance spectroscopy (EIS) test, dc polarization test and linear sweep voltammetry (LSV) test. NG electrodes were made using a slurry of NG and acetone. EIS test, cyclic voltammetry (CV) test and galvanostatic charge discharge (GCD) test have been done to characterize the EDLC. Optimized electrolyte composition with NR: 0.6 ZnTF (weight basis) exhibited a conductivity of 0.6 x 10-4 Scm-1 at room temperature. Conductivity was predominantly due to ions. The electrochemical stability window was found to be from 0.25 V to 2.500 V. Electrolyte was sandwiched between two identical NG electrodes to fabricate an EDLC. Single electrode specific capacitance was about 2.26 Fg-1 whereas the single electrode discharge capacitance was about 1.17 Fg-1. The EDLC with this novel NR-ZnTF based SPE evidences its suitability to be used for different applications with further improvement.

Electrochemical Characterization and Mechanical Properties of PEO-like Solid Polymer Electrolyte Based on Bisphenol A Ethoxylate Diacrylate (Bisphenol A ethoxylate diacrylate를 가교제로 사용한 PEO계 고분자 전해질의 전기화학적 특성 및 물성)

  • Kim, Seok-Koo;Kang, Yong-Ku;Rhee, Hee-Woo;Lee, Chang-Jin
    • Polymer(Korea)
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    • v.25 no.4
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    • pp.568-574
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    • 2001
  • PEO-like solid polymer electrolytes based on bisphenol A ethoxylate acrylate were synthesized and their electrochemical properties and mechanical stability were studied. Low molecular weight poly(ethylene glycol) dimethyl ether (PEGDMe) was added to increase the conductivity of the electrolyte. The maximum conductivity of the resulting polymer electrolyte was found to be 1.0 ${\times}$ 10$^{-3}$ S/cm [Bisphenol A ethoxylate diacrylate ([EO]/[phenol]= 15), PEGDMe250 80 wt%, LiCF$_3SO_3$] at 30$^{\circ}$C. Tensile strength of the free standing polymer electrolyte films was measured to be in the range of 0.4 ~ 5 MPa and these polymer electrolyte films did not show a crack even in 90$^{\circ}$ and 180$^{\circ}$ bending against ${\phi}$=3 mm bar. These electrolytes showed oxidation stability up to 4.5 V vs. lithium reference electrode.

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