• Title/Summary/Keyword: Solid polymer electrolyte

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Semi-interpenetrating Solid Polymer Electrolyte for LiCoO2-based Lithium Polymer Batteries Operated at Room Temperature

  • Nguyen, Tien Manh;Suk, Jungdon;Kang, Yongku
    • Journal of Electrochemical Science and Technology
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    • v.10 no.2
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    • pp.250-255
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    • 2019
  • Poly(ethylene oxide) (PEO)-based solid polymer electrolytes (SPEs) show promise for improving the lithium ion battery safety. However, due to oxidation of the PEO group and corrosion of the Al current collector, PEO-based SPEs have not previously been effective for use in $LiCoO_2$ (LCO) cathode materials at room temperature. In this paper, a semi-interpenetrating polymer network (semi-IPN) PEO-based SPE was applied to examine the performance of a LCO/SPE/Li metal cell at different voltage ranges. The results indicate that the SPE can be applied to LCO-based lithium polymer batteries with high electrochemical performance. By using a carbon-coated aluminum current collector, the Al corrosion was mostly suppressed during cycling, resulting in improvement of the cell cycle stability.

Perfluorinated Sulfonic Acid Ionomer-PTFE Pore-filling Membranes for Polymer Electrolyte Membrane Fuel Cells (고분자전해질연료전지용 과불소계 술폰화 이오노머-PTFE 강화막)

  • Kang, Seong Eun;Lee, Chang Hyun
    • Membrane Journal
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    • v.25 no.2
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    • pp.171-179
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    • 2015
  • Perfluorinated sulfonic acid ionomers (PFSAs) have been widely as solid electrolyte materials for polymer electrolyte membrane fuel cells, since they exhibit excellent chemical durability under their harsh application conditions as well as good proton conductivity. Even PFSA materials, however, suffer from physical failures associated with repeated membrane swelling and deswelling, resulting in fairly reduced electrochemical lifetime. In this study, pore-filling membranes are prepared by impregnating a Nafion ionomer into the pore of a porous PTFE support film and their fundamental characteristics are evaluated. The developed pore-filling membranes exhibit extremely high proton conductivity of about $0.5S\;cm^{-1}@90^{\circ}C$ in liquid water.

Pore-filling anion conducting membranes and their cell performance for a solid alkaline fuel cell (세공충진 음이온 전도성막의 제조 및 이를 이용한 고체알칼리 연료전지 성능 평가)

  • Choi, Youngwoo;Lee, Misoon;Park, Gugon;Yim, Sungdae;Yang, Taehyun;Kim, Changsoo
    • 한국신재생에너지학회:학술대회논문집
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    • 2010.06a
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    • pp.129.2-129.2
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    • 2010
  • AEM which were used for solid alkaline fuel cell(SAFC) were prepared by photo polymerization in method pore-filling with various quaternary ammonium cationic monomers and crosslinkers without an amination process. Their specific thermal and chemical properties were characterized through various analyses and the physico-chemical properties of the prepared electrolyte membranes such as swelling behavior, ion exchange capacity and ionic conductivity were also investigated in correlation with the electrolyte composition. The polymer electrolyte membranes prepared in this study have a very wide hydroxyl ion conductivity range of 0.01 - 0.45S/cm depending on the composition ratio of the electrolyte monomer and crosslinking agent used for polymerization. However, the hydroxyl ion conductivity of the membranes was relatively higher at the whole cases than those of commercial products such as A201 membrane of Tokuyama. These pore-filling membranes have also excellent properties such as smaller dimensional affects when swollen in solvents, higher mechanical strength, lowest electrolyte crossover through the membranes, and easier preparation process compared of traditional cast membranes. The prepared membranes were then applied to solid alkaline fuel cell and it was found comparable fuel cell performance to A201 membrane of Tokuyama.

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Preparation and Characterization of Advanced Organic Polymer - Inorganic Composite Gel Electrolyte for Dye-sensitized Solar Cells (염료 감응 태양전지를 위한 고급 유기 고분자 - 무기 복합 겔형 전해질의 제조와 특성분석)

  • Akhtar, M. Shaheer;Park, Jung-Guen;Kim, Ui-Yeon;Lee, Hyun-Choel;Yang, O-Bong
    • 한국신재생에너지학회:학술대회논문집
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    • 2009.11a
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    • pp.350-354
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    • 2009
  • In this work, polymer - inorganic composites have prepared using polymer such as polyethylene glycol (PEG)/poly (methyl methacrylate, PMMA) and inorganic nanofillers materials such as TiO2 nanotubes (TiNTs)/carbon nanotubes (CNTs). The extensive structural, morphological and ionic properties revealed that the high surface area and tubular feature of nanofillers improved the interaction and cross-linking to polymer matrix which is significantly enhanced the ionic conductivity and electrical properties of composite electrolytes. Comparably high conversion efficiency ~4.5% has been observed by using the newly prepared PEG-TiNTs composite solid electrolyte as compared with PMMA-CNTs electrolyte based DSSCs (~3%). The detailed comparative properties would be discussed in term of their structural, morphology, ionic and photovoltaic properties.

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The Effect of Plasticizer and Zeolite Addition on the Interface between Polymer Electrolyte Based on Poly(ethylene oxide) and Li Electrode. (이온전도성 Poly(ethylene oxide) 고분자 전해질과 Li과의 계면에 미치는 가소제 및 Zeolite의 첨가효과)

  • Kim, J.U.;Gu, H.B.;Jin, B.S.;Moon, S.I.;Yun, M.S.
    • Proceedings of the KIEE Conference
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    • 1994.11a
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    • pp.205-208
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    • 1994
  • The purpose of this study is to research and develop solid polymer electrolyte(SPE) for Li secondary battery. PEO-$LiClO_4$ electrolyte with plasticizer is very unstable. Passivation phenomena in polymer electrolyte cell was described by the SPL model. The time dependance of the impedance indicates that a passivation layer grows rapidly on the Li surface. However, the growing of passivation layer on the Li surface can be restrained by addition of zeolite to the PEO electrolyte. It suggested that addition of zeoliteto to the PEO-$LiClO_4$ electrolyte effectively controls the formation of a passivation layer on Li electrode.

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In Situ Crosslinked Ionic Gel Polymer Electrolytes for Dye Sensitized Solar Cells

  • Shim, Hyo-Jin;Kim, Dong-Wook;Lee, Chang-Jin;Kang, Yong-Ku;Suh, Dong-Hack
    • Macromolecular Research
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    • v.16 no.5
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    • pp.424-428
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    • 2008
  • We prepared an ionic gel polymer electrolyte for dye-sensitized solar cells (DSSCs) without leakage problem. Triiodide compound (BTDI) was synthesized by the reaction of benzene tricarbonyl trichloride with diethylene glycol monotosylate and subsequent substitution of tosylate by iodide using NaI. Bisimidazole was prepared by the reaction of imidazole with the triethylene glycol ditosylate under strongly basic condition provided by NaH. BTDI and bisimidazole dissolved in an ionic liquid were injected into the cells and permeated into the $TiO_2$ nanopores. In situ crosslinking was then carried out by heating to form a network structure of poly(imidazolium iodide), thereby converting the ionic liquid electrolytes to a gel or a quasi-solid state. A monomer (BTDI and bisimidazole) concentration in the electrolytes of as low as 30 wt% was sufficient to form a stable gel type electrolyte. The DSSCs based on the gel polymer electrolytes showed a power conversion efficiency of as high as 1.15% with a short circuit current density of $5.69\;mAcm^{-2}$, an open circuit voltage of 0.525 V, and a fill factor of 0.43.

Electrochemical Properties of Activated Carbon Capacitor Adopting a Proton-conducting Hydrogel Polymer Electrolyte (수소이온전도성 고분자 겔전해질을 적용한 활성탄소계 전기이중층 캐패시터의 전기화학적 특성)

  • Latifatu, Mohammed;Kim, Kwang Man;Kim, Yong Joo;Ko, Jang Myoun
    • Elastomers and Composites
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    • v.47 no.4
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    • pp.292-296
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    • 2012
  • An electric double-layer capacitor (ELDC) of activated carbon electrode is prepared using a proton-conducting hydrogel polymer electrolyte, which is composed of poly(vinyl alcohol), silicotungstic acid, $H_3PO_4$, and deionized water. A solid film by evaporating the hydrogel polymer electrolyte is also prepared for comparison. The hydrogel polymer electrolyte also acts as a separator with the thickness of about $80{\mu}m$ and the room-temperature ionic conductivity of $10^{-2}S\;cm^{-1}$. The EDLC containing the symmetric electrodes of activated carbon shows the specific capacitance of $58F\;g^{-1}$ at $100mV\;s^{-1}$ with a good cycle life, implying that the hydrogel polymer electrolyte is very promising for use in EDLCs.

Fabrication of Flexible Solid-state Dye-sensitized $TiO_2$ Nanotube Solar Cell Using UV-curable NOA

  • Park, Ik-Jae;Park, Sang-Baek;Kim, Ju-Seong;Jin, Gyeong-Seok;Hong, Guk-Seon
    • Proceedings of the Korean Vacuum Society Conference
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    • 2012.08a
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    • pp.396-396
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    • 2012
  • $TiO_2$ anatase nanotube arrays (NTAs) were grown by electrochemical anodization and followed annealing of Ti foil. Ethylene glycol/$NH_4F$-based organic electrolyte was used for electrolyte solution and using second anodization process to obtain free-standing NTAs. After obtaining NTAs, ITO film was deposited by sputtering process on bottom of NTAs. UV-curable NOA was used for attach free-standing NTAs on flexible plastic substrate (PEN). Solid state electrolyte (spiro-OMeTAD) was coated via spin-coating method on top of attached NTAs. Ag was deposited as a counter electrode. Under AM 1.5 simulated sunlight, optical characteristics of devices were investigated. In order to use flexible polymer substrate, processes have to be conducted at low temperature. In case of $TiO_2$ nano particles (NPs), however, crystallization of NPs at high temperature above $450^{\circ}C$ is required. Because NTAs were conducted high temperature annealing process before NTAs transfer to PEN, it is favorable for using PEN as flexible substrate. Fabricated flexible solid-state DSSCs make possible the preventing of liquid electrolyte corrosion and leakage, various application.

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