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Добірка наукової літератури з теми "PEO - Polymer Electrolytes"

Автор: Grafiati
Опубліковано: 7 вересня 2023

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Статті в журналах з теми "PEO - Polymer Electrolytes"

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Somsongkul, Voranuch, Surassawatee Jamikorn, Atchana Wongchaisuwat, San H. Thang, and Marisa Arunchaiya. "Efficiency and Stability Enhancement of Quasi-Solid-State Dye-Sensitized Solar Cells Based on PEO Composite Polymer Blend Electrolytes." Advanced Materials Research 1131 (December 2015): 186–92. http://dx.doi.org/10.4028/www.scientific.net/amr.1131.186.

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The composite polymer electrolyte consisting of poly (ethylene oxide) (PEO), KI, I2 and TiO2 was blended with low molecular weight poly (ethylene glycol) (PEG) and (PEG-MA)-Ru. The SEM images of these blended PEO electrolytes showed better dispersion of materials and the electrochemical impedance spectroscopic study showed an increase in conductivity compared to that of composite PEO electrolyte. These results were consistent with enhanced efficiency of DSSCs using these blended PEO electrolytes. The energy conversion efficiencies of DSSCs using composite PEO-PEG, PEO-(PEG-MA)-Ru and PEO-PEG-(PEG-MA)-Ru polymer blend electrolytes were 5.47, 5.05 and 5.28, respectively compared to 4.99 of DSSC using composite PEO electrolyte. The long-term storage of unsealed DSSCs at room temperature for 93 days demonstrated that the cell efficiency gradually decreased to 0.49-1.88%. DSSCs assembled with composite polymer blend electrolyte showed a slower decrease than that of DSSC using composite PEO electrolyte. It was found that the composite PEO-PEG-(PEG-MA)-Ru polymer blend electrolyte of 1.0:0.1:0.1 weight ratio gave the best improvement in stability of DSSCs.
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Lin, Yuan, Maio Wang, and Xu Rui Xiao. "Investigation of PEO-Imidazole Ionic Liquid Oligomer and Polymer Electrolytes for Dye-Sensitized Solar Cells." Key Engineering Materials 451 (November 2010): 41–61. http://dx.doi.org/10.4028/www.scientific.net/kem.451.41.

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Ionic liquid oligomer, 1-oligo(ethyleneoxide)-3-methylimidazolium salt (PEO(X)MIm) and Ionic liquid polymer, poly(1-oligo (ethylene glycol) methacrylate-3-methylimidazolium) salt (P(MOEMIm)) prepared by incorporating imidazolium ionic liquid with PEO oligomer and polymer were investigated as electrolytes for dye-sensitized solar cells (DSCs). Ionic liquid electrolytes were composed of LiI, I2, and PEO(X)MImCl or the mixture of 1-hexyl-3-methylidazolium iodide (HMImI), 1-ethyl-3-methylimidazolium tetrafluoroborate (EMImBF4) and PEO(X)MImCl. Quasi-solid-state electrolytes were prepared by employing the imidazole polymers P(MOEMImCl) to solidify the liquid electrolyte containing lithium iodide, iodine and ethylene carbonate (EC)/propylene carbonate (PC) mixed solvent. Ionic liquid based quasi-solid state electrolytes were prepared by solidifying the ionic liquid electrolytes containing HMImI or a binary mixture of HMImI and EMImBF4 with an ionic liquid polymer P(MOEMImCl), respectively. The influences of PEO molecular weight, polymer content, addition of alkyl ionic liquid and various anions of the ionic liquid oligomers and polymer on the ionic conductivity, apparent diffusion coefficient of the redox species in the electrolytes and the performance of solar cells were examined. The influences on the kinetic behaviors of dye regeneration and triiodide reduction reactions taken place at nanocrystalline TiO2 electrode and Pt counter-electrode, respectively, were also studied by cyclic-voltammetry and electrochemical impedance spectroscopy measurements. By using ternary ionic liquid electrolyte containing 1M lithium iodide and 0.5M iodine in the ionic liquid of the ionic liquid mixture of PEO(X)MImCl), HMImI and EMImBF4, quasi-solid-state electrolytes and ionic liquid based quasi-solid state electrolytes the photoelectron conversion efficiency of DSCs is 7.89%, 7.6% and 6.1%, respectively(AM 1.5, 100mWcm−2). These results show the potential application of PEO based ionic liquid in SCs.
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Sharon, Daniel, Chuting Deng, Peter Bennington, Michael Webb, Shrayesh N. Patel, Juan de Pablo, and Paul F. Nealey. "Critical Percolation Threshold for Solvation Site Connectivity in Polymer Electrolytes Mixtures." ECS Meeting Abstracts MA2022-01, no. 45 (July 7, 2022): 1906. http://dx.doi.org/10.1149/ma2022-01451906mtgabs.

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To address the tradeoff between mechanical strength and Li+ conductivity in Poly(Ethylene Oxide) (PEO)-based electrolytes, a rigid nonconductive polymer is frequently added to the electrolyte via blending or copolymerization. The ionic conductivity of mixed PEO electrolytes is generally lower than that of unmixed PEO electrolytes. The suppressed ionic conductivity is attributed to the reduced segmental mobility and connectivity of the conductive PEO cites. Most experimental systems make it difficult to decouple the two mechanisms and accurately examine their impact on conductivity. We compare two symmetric polymer mixtures (50:50 wt%): a miscible polymer blend PEO/PMMA and a disordered block copolymer (BCP) PEO-b-PMMA, both with the same amount of Li salt. Because their chemical and physical properties are the same, changes in ionic conductivity can be attributed solely to local changes in PEO network connectivity. We discover that the mixtures' immediate Li+ solvation sites (<5 Å) are identical to those of unmixed PEO electrolytes. The presence of non-conducting PMMA near the PEO, on the other hand, causes local concentration changes at longer range scales. The BCP is more mixed than the blend electrolyte at these length scales, resulting in a factor of two drop in conductivity. To that end, we propose a quantitative computational model that considers Li+ transport within and across PEO clusters at the appropriate length scales. This new understanding of network connectivity in polymer electrolyte mixtures is critical for the design of future multiphase polymer electrolyte systems.
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Arasakumari, M. "Structural, optical and electrical properties of anhydrous GdCl3 doped PEO polymer electrolyte films." Journal of Ovonic Research 18, no. 4 (July 31, 2022): 553. http://dx.doi.org/10.15251/jor.2022.184.553.

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Анотація:
GdCl3 doped PEO polymer electrolyte films were prepared using solution casting technique. XRD patterns, FTIR spectra and optical absorption studies confirm an amorphous nature and the formation of the polymer electrolyte films. The ionic conductivity increases with the GdCl3 content and the maximum value at room temperature is about 1.8310-2 S/cm for 20 mol% GdCl3doped PEO film. This value is more than two orders of magnitude larger than the ionic conductivity of NASICON type Gd-doped solid electrolytes and other polymer electrolytes. The results suggest that the Gd3+ doped PEO polymer electrolyte films are good candidates for future electrochemical devices.
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He, Binlang, Shenglin Kang, Xuetong Zhao, Jiexin Zhang, Xilin Wang, Yang Yang, Lijun Yang, and Ruijin Liao. "Cold Sintering of Li6.4La3Zr1.4Ta0.6O12/PEO Composite Solid Electrolytes." Molecules 27, no. 19 (October 10, 2022): 6756. http://dx.doi.org/10.3390/molecules27196756.

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Анотація:
Ceramic/polymer composite solid electrolytes integrate the high ionic conductivity of in ceramics and the flexibility of organic polymers. In practice, ceramic/polymer composite solid electrolytes are generally made into thin films rather than sintered into bulk due to processing temperature limitations. In this work, Li6.4La3Zr1.4Ta0.6O12 (LLZTO)/polyethylene-oxide (PEO) electrolyte containing bis(trifluoromethanesulfonyl)imide (LiTFSI) as the lithium salt was successfully fabricated into bulk pellets via the cold sintering process (CSP). Using CSP, above 80% dense composite electrolyte pellets were obtained, and a high Li-ion conductivity of 2.4 × 10−4 S cm–1 was achieved at room temperature. This work focuses on the conductivity contributions and microstructural development within the CSP process of composite solid electrolytes. Cold sintering provides an approach for bridging the gap in processing temperatures of ceramics and polymers, thereby enabling high-performance composites for electrochemical systems.
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Wang, Bo. "Polymer-Mineral Composite Solid Electrolytes." MRS Advances 4, no. 49 (2019): 2659–64. http://dx.doi.org/10.1557/adv.2019.317.

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ABSTRACTPolymer-mineral composite solid electrolytes have been prepared by hot pressing using lithium ion-exchanged bentonite (LIEB) and mineral derived LATSP (Li1.2Al0.1Ti1.9Si0.1P2.9O12) NASICON materials as solid electrolyte fillers in the polyethylene oxide (PEO) polymer containing LiTFSI salt. The mineral based solid electrolyte fillers not only increase ionic conductivity but also improve thermal stability. The highest ionic conductivities in the PEO-LIEB and PEO-LATSP composites were found to be 9.4×10-5 and 3.1×10-4 S·cm-1 at 40°C, respectively. The flexible, thermal stable and mechanical sturdy polymer-mineral composite solid electrolyte films can be used in the all-solid-state batteries.
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Lee, Kyoung-Jin, Eun-Jeong Yi, Gangsanin Kim, and Haejin Hwang. "Synthesis of Ceramic/Polymer Nanocomposite Electrolytes for All-Solid-State Batteries." Journal of Nanoscience and Nanotechnology 20, no. 7 (July 1, 2020): 4494–97. http://dx.doi.org/10.1166/jnn.2020.17562.

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Анотація:
Lithium-ion conducting nanocomposite solid electrolytes were synthesized from polyethylene oxide (PEO), poly(methyl methacrylate) (PMMA), LiClO4, and Li1.3Al0.3Ti1.7(PO4)3 (LATP) ceramic particles. The synthesized nanocomposite electrolyte consisted of LATP particles and an amorphous polymer. LATP particles were homogeneously distributed in the polymer matrix. The nanocomposite electrolytes were flexible and self-standing. The lithium-ion conductivity of the nanocomposite electrolyte was almost an order of magnitude higher than that of the PEO/PMMA solid polymer electrolyte.
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Zhang, Xiaoxian, Jing Tian, and Chunmei Jia. "Advances in the Study of Gel Polymer Electrolytes in Electrochromic Devices." Journal of Progress in Engineering and Physical Science 2, no. 1 (March 2023): 47–53. http://dx.doi.org/10.56397/jpeps.2023.03.06.

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Анотація:
The electrolytes in electrochromic devices (ECDs) serve as a conduction medium between electrodes and providing compensating ions for electrochromic reactions. Their characteristics directly affect the performance of electrochromic devices. Due to their ease of processing and encapsulation and high ionic conductivity, polymer gel electrolytes are widely used in electrochromic devices. As gel electrolyte polymers, polyethylene oxide (PEO), polymethyl methacrylate (PMMA), and polyvinylidene fluoride (PVDF) are reviewed according to their polymer matrix. Furthermore, future development trends in gel polymer electrolytes are discussed.
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Mabuchi, Takuya, Koki Nakajima, and Takashi Tokumasu. "Molecular Dynamics Study of Ion Transport in Polymer Electrolytes of All-Solid-State Li-Ion Batteries." Micromachines 12, no. 9 (August 26, 2021): 1012. http://dx.doi.org/10.3390/mi12091012.

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Анотація:
Atomistic analysis of the ion transport in polymer electrolytes for all-solid-state Li-ion batteries was performed using molecular dynamics simulations to investigate the relationship between Li-ion transport and polymer morphology. Polyethylene oxide (PEO) and poly(diethylene oxide-alt-oxymethylene), P(2EO-MO), were used as the electrolyte materials, and the effects of salt concentrations and polymer types on the ion transport properties were explored. The size and number of LiTFSI clusters were found to increase with increasing salt concentrations, leading to a decrease in ion diffusivity at high salt concentrations. The Li-ion transport mechanisms were further analyzed by calculating the inter/intra-hopping rate and distance at various ion concentrations in PEO and P(2EO-MO) polymers. While the balance between the rate and distance of inter-hopping was comparable for both PEO and P(2EO-MO), the intra-hopping rate and distance were found to be higher in PEO than in P(2EO-MO), leading to a higher diffusivity in PEO. The results of this study provide insights into the correlation between the nanoscopic structures of ion solvation and the dynamics of Li-ion transport in polymer electrolytes.
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10

Magistris, Aldo, and Kamal Singh. "PEO-based polymer electrolytes." Polymer International 28, no. 4 (1992): 277–80. http://dx.doi.org/10.1002/pi.4990280406.

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Більше джерел

Дисертації з теми "PEO - Polymer Electrolytes"

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Maranski, Krzysztof Jerzy. "Polymer electrolytes : synthesis and characterisation." Thesis, University of St Andrews, 2013. http://hdl.handle.net/10023/3411.

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Crystalline polymer/salt complexes can conduct, in contrast to the view held for 30 years. The alpha-phase of the crystalline poly(ethylene oxide)₆:LiPF₆ is composed of tunnels formed from pairs of (CH₂-CH₂-O)ₓ chains, within which the Li⁺ ions reside and along which the latter migrate.¹ When a polydispersed polymer is used, the tunnels are composed of 2 strands, each built from a string of PEO chains of varying length. It has been suggested that the number and the arrangement of the chain ends within the tunnels affects the ionic conductivity.² Using polymers with uniform chain length is important if we are to understand the conduction mechanism since monodispersity results in the chain ends occurring at regular distances along the tunnels and imposes a coincidence of the chain ends between the two strands.² Since each Li⁺ is coordinated by 6 ether oxygens (3 oxygens from each of the two polymeric strands forming a tunnel), monodispersed PEOs with the number of ether oxygen being a multiple of 3 (NO = 3n) can form either “all-ideal” or “all-broken” coordination environments at the end of each tunnel, while for both NO = 3n-1 and NO = 3n+1 complexes, both “ideal” and “broken” coordinations must occur throughout the structure. A synthetic procedure has been developed and a series of 6 consecutive (increment of EO unit) monodispersed molecular weight PEOs have been synthesised. The synthesis involves one end protection of a high purity glycol, functionalisation of the other end, ether coupling reaction (Williamson's type ether synthesis³), deprotection and reiteration of ether coupling. The parameters of the process and purification methods have been strictly controlled to ensure unprecedented level of monodispersity for all synthesised samples. Thus obtained high purity polymers have been used to study the influence of the individual chain length on the structure and conductivity of the crystalline complexes with LiPF₆. The results support the previously suggested model of the chain-ends arrangement in the crystalline complexes prepared with monodispersed PEO² over a range of consecutive chain lengths. The synthesised complexes constitute a series of test samples for establishing detailed mechanism of ionic conductivity. Such series of monodispersed crystalline complexes have been studied and characterised here (PXRD, DSC, AC impedance) for the first time. References: 1. G. S. MacGlashan, Y. G. Andreev, P. G. Bruce, Structure of the polymer electrolyte poly(ethylene oxide)₆:LiAsF₆. Nature, 1999, 398(6730): p. 792-794. 2. E. Staunton, Y. G. Andreev, P. G. Bruce, Factors influencing the conductivity of crystalline polymer electrolytes. Faraday Discussions, 2007, 134: p. 143-156. 3. A. Williamson, Theory of Aetherification. Philosophical Magazine, 1850, 37: p. 350-356.
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2

Ennari, Jaana. "Atomistic molecular modelling of PEO sulfonic acid anion based polymer electrolytes." Helsinki : University of Helsinki, 2000. http://ethesis.helsinki.fi/julkaisut/mat/kemia/vk/ennari/.

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3

Denney, Jacob Michael. "The Thermal and Mechanical Characteristics of Lithiated PEO LAGP Composite Electrolytes." Wright State University / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=wright1609971094548742.

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Eiamlamai, Priew. "Electrolytes polymères à base de liquides ioniques pour batteries au lithium." Thesis, Université Grenoble Alpes (ComUE), 2015. http://www.theses.fr/2015GRENI016/document.

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Анотація:
De nouvelles familles de liquides ioniques conducteurs par ion lithium; à anions aromatiques et aliphatiques de type perfluorosulfonate perfluorosulfonylimidure attachés à des oligoéthers (méthoxy polyéthylène glycol mPEG) de longueurs différentes ont été synthétisées et caractérisées dans le but d'améliorer l'interaction entre les chaînes de POE et les sels de lithium en améliorant la mobilité segmentaire. Ainsi différentes membranes amorphes ou peu cristallines améliorent le transport cationique par rapport aux électrolytes polymères usuels. . Leurs propriétés ont été évaluées dans deux types de polymères hôtes : un polyéther linéaire (POE) et un polyéther réticulé préparé par un procédé "VERT". Leurs parties oligooxyéthylène aident à la solvatation des cations lithium et conduisent à l'augmentation des propriétés de transport; c'est à dire la conductivité cationique et le nombre de transport. Leurs stabilités thermiques et électrochimiques sont adaptées à l'application batterie lithium-polymère
The new families of lithium-conducting ionic liquids; aromatic and aliphatic lithium salts based on perfluorosulfonate and perfluorosulfonylimide anions attached to an oligoether (methoxy polyethylene glycol mPEG) with different lengths were synthesized and characterized with the aim to improve the salt interaction with the host polymer's POE chains while keeping a high segmental mobility. They allowed obtaining membranes with lower crystallization degree and higher cationic transport number as compared with benchmarked salts. Their properties as lithium salts were investigated in two types of host polymers i.e. a linear polyether (POE) and a cross-linked polyether prepared by a ‘GREEN' process. Their oligooxyethylene moieties improve the lithium cation solvation leading to an increase in cationic transference numbers. Their electrochemical and thermal stabilities are suitable for lithium battery application
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Crisanti, Samuel Nathan Crisanti. "Effect of Alumina and LAGP Fillers on the Ionic Conductivity of Printed Composite Poly(Ethylene Oxide) Electrolytes for Lithium-Ion Batteries." Case Western Reserve University School of Graduate Studies / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=case1522756200308156.

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6

Soundiramourty, Anuradha. "Towards the low temperature reduction of carbon dioxide using a polymer electrolyte membrane electrolysis cell." Thesis, Paris 11, 2015. http://www.theses.fr/2015PA112174.

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L’objectif principal de ce travail de thèse était d’évaluer les propriétés électro catalytiques de différents composés moléculaires vis-à-vis de la réduction électrochimique basse température du dioxyde de carbone, en vue d’applications dans des cellules d’électrolyse à électrolyte polymère solide. Après avoir mesuré les performances de métaux modèles (cuivre et nickel) servant de référence, nous avons testé les performances de quelques composés moléculaires à base de nickel. Le rôle catalytique de ces différents composés a été mis en évidence en mesurant les courbes intensité-potentiel dans différents milieux. Nous avons évalué l’importance de la source en hydrogène dans le mécanisme réactionnel. Les produits de réduction du dioxyde de carbone formés dans le mélange réactionnel ont été analysés par chromatographie en phase gazeuse. Nous avons ensuite abordé la possibilité de développer des cellules d’électrolyse à électrolyte polymère solide. Nous avons testé des cellules utilisant soit des anodes à eau liquide pour le dégagement d’oxygène, soit des anodes à hydrogène gazeux. L’utilisation de complexes moléculaires à base de nickel à la cathode a permis d’abaisser le potentiel de la cathode et de réduire le CO₂ mais la réaction de dégagement d’hydrogène reste prédominante
The main objective of this research work was to put into evidence the electrocatalytic activity of various molecular compounds with regard to the electrochemical reduction of carbon dioxide, at low temperature, in view of potential application in PEM cells. First, reference values have been measured on copper and nickel metals. Then the performances of some molecular compounds have been measured. The electrochemical activity of these different compounds has been put into evidence by recording the current-potential relationships in various media. The role of a hydrogen source for the reduction processes has been evaluated. The formation of reduction products has been put into evidence and analyzed by gas phase chromatography. Then, a PEM cell has been developed and preliminary tests have been performed. PEM cells with either an oxygen-evolving anode or a hydrogen-consuming anode have been tested. Using nickel molecular complexes, it has been possible to lower the potential of the cathode and to reduce CO₂ but the parasite hydrogen evolution reaction was found to remain predominant
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7

Marshall, Josiah. "Synthesis of the Diazonium Zwitterionic Polymer/Monomer for Use as the Electrolyte in Polymer Electrolyte Membrane (PEM) Fuel Cells." Digital Commons @ East Tennessee State University, 2021. https://dc.etsu.edu/etd/3968.

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My research goals are to synthesize new zwitterionic perfluorosulfonimide (PFSI) monomer/polymers. They are expected to replace traditionally used perfluorosulfonic acid (PFSA) polymers as the electrolyte in PEM fuel cells. For the PFSI monomer preparation, we designed a nine-step synthesis route. Thus far, I have successfully completed the synthesis of 4- (2-bromotetrafluoroethoxy)-benzenesulfonyl amide, 4-acetoxybenzenesulfonic acid sodium salt, and 4-chlorosulfonyl phenyl acetate. The coupling reaction of 4-(2-bromotetrafluoroethoxy)- benzenesulfonyl amide with 4-chlorosulfonyl phenyl acetate, was troublesome due to slow reaction kinetics and byproducts. Additionally, I did a methodology study for the homopolymerziation of the perfluoro 3(oxapent-4-ene) sulfonyl fluoride monomer. We compared the weight average molecular weight (Mw) of different reaction conditions. The best Mw was achieved when the polymerization was carried out for five days at 100 °C and150 psi with 2 wt % initiator and 5 g of monomer. All the compounds were characterized by melting point, GC-MS, GPC, FT-IR, and 13C/1H/19F NMR.
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Bayrak, Pehlivan İlknur. "Functionalization of polymer electrolytes for electrochromic windows." Doctoral thesis, Uppsala universitet, Fasta tillståndets fysik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-204437.

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Saving energy in buildings is of great importance because about 30 to 40 % of the energy in the world is used in buildings. An electrochromic window (ECW), which makes it possible to regulate the inflow of visible light and solar energy into buildings, is a promising technology providing a reduction in energy consumption in buildings along with indoor comfort. A polymer electrolyte is positioned at the center of multi-layer structure of an ECW and plays a significant role in the working of the ECW. In this study, polyethyleneimine: lithium (bis(trifluoromethane)sulfonimide (PEI:LiTFSI)-based polymer electrolytes were characterized by using dielectric/impedance spectroscopy, differential scanning calorimetry, viscosity recording, optical spectroscopy, and electrochromic measurements. In the first part of the study, PEI:LiTFSI electrolytes were characterized at various salt concentrations and temperatures. Temperature dependence of viscosity and ionic conductivity of the electrolytes followed Arrhenius behavior. The viscosity was modeled by the Bingham plastic equation. Molar conductivity, glass transition temperature, viscosity, Walden product, and iso-viscosity conductivity analysis showed effects of segmental flexibility, ion pairs, and mobility on the conductivity. A connection between ionic conductivity and ion-pair relaxation was seen by means of (i) the Barton-Nakajima-Namikawa relation, (ii) activation energies of the bulk relaxation, and ionic conduction and (iii) comparing two equivalent circuit models, containing different types of Havriliak-Negami elements, for the bulk response. In the second part, nanocomposite PEI:LiTFSI electrolytes with SiO2, In2O3, and In2O3:Sn (ITO) were examined. Adding SiO2 to the PEI:LiTFSI enhanced the ionic conductivity by an order of magnitude without any degradation of the optical properties. The effect of segmental flexibility and free ion concentration on the conduction in the presence of SiO2 is discussed. The PEI:LiTFSI:ITO electrolytes had high haze-free luminous transmittance and strong near-infrared absorption without diminished ionic conductivity. Ionic conductivity and optical clarity did not deteriorate for the PEI:LiTFSI:In2O3 and the PEI:LiTFSI:SiO2:ITO electrolytes. Finally, propylene carbonate (PC) and ethylene carbonate (EC) were added to PEI:LiTFSI in order to perform electrochromic measurements. ITO and SiO2 were added to the PEI:LiTFSI:PC:EC and to a proprietary electrolyte. The nanocomposite electrolytes were tested for ECWs with the configuration of the ECWs being plastic/ITO/WO3/polymer electrolyte/NiO (or IrO2)/ITO/plastic. It was seen that adding nanoparticles to polymer electrolytes can improve the coloring/bleaching dynamics of the ECWs. From this study, we show that nanocomposite polymer electrolytes can add new functionalities as well as enhancement in ECW applications.
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9

Pehlivan-Davis, Sebnem. "Polymer Electrolyte Membrane (PEM) fuel cell seals durability." Thesis, Loughborough University, 2016. https://dspace.lboro.ac.uk/2134/21749.

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Polymer electrolyte membrane fuel cell (PEMFC) stacks require sealing around the perimeter of the cells to prevent the gases inside the cell from leaking. Elastomeric materials are commonly used for this purpose. The overall performance and durability of the fuel cell is heavily dependent on the long-term stability of the gasket. In this study, the degradation of three elastomeric gasket materials (silicone rubber, commercial EPDM and a developed EPDM 2 compound) in an accelerated ageing environment was investigated. The change in properties and structure of a silicone rubber gasket caused by use in a real fuel cell was studied and compared to the changes in the same silicone rubber gasket material brought about by accelerated aging. The accelerated aging conditions were chosen to relate to the PEM fuel cell environment, but with more extreme conditions of elevated temperature (140°C) and greater acidity. Three accelerated ageing media were used. The first one was dilute sulphuric acid solution with the pH values of 1, 2 and 4. Secondly, Nafion® membrane suspended in water was used for accelerated ageing at a pH 3 to 4. Finally, diluted trifluoroacetic acid (TFA) solution of pH 3.3 was chosen. Weight change and the tensile properties of the aged gasket samples were measured. In addition, compression set behaviour of the elastomeric seal materials was investigated in order to evaluate their potential sealing performance in PEM fuel cells. The results showed that acid hydrolysis was the most likely mechanism of silicone rubber degradation and that similar degradation occurred under both real fuel cell and accelerated aging conditions. The effect of TFA solution on silicone rubber was more aggressive than sulphuric acid and Nafion® solutions with the same acidity (pH value) suggesting that TFA accelerated the acid hydrolysis of silicone rubber. In addition, acid ageing in all three acidic solutions caused visible surface damage and a significant decrease in tensile strength of the silicone rubber material, but did not significantly affect the EPDM materials. EPDM 2 compound had a desirable (low) compression set value which was similar to silicone rubber and much better than the commercial EPDM. It also showed a very good performance in the fuel cell test rig conforming that it a potential replacement for silicone rubber in PEMFCs.
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10

Verma, Atul. "Transients in Polymer Electrolyte Membrane (PEM) Fuel Cells." Diss., Virginia Tech, 2015. http://hdl.handle.net/10919/64247.

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The need for energy efficient, clean and quiet, energy conversion devices for mobile and stationary applications has presented proton exchange membrane (PEM) fuel cells as a potential energy source. The use of PEM fuel cells for automotive and other transient applications, where there are rapid changes in load, presents a need for better understanding of transient behavior. In particular at low humidity operations; one of the factors critical to the performance and durability of fuel cell systems is water transport in various fuel cell layers, including water absorption in membrane. An essential aspect to optimization of transient behavior of fuel cells is a fundamental understanding of response of fuel cell system to dynamic changes in load and operating parameters. This forms the first objective of the dissertation. An insight in to the time scales associated with various transport phenomena will be discussed in detail. In the second component on the study, the effects of membrane properties on the dynamic behavior of the fuel cells are analyzed with focus on membrane dry-out for low humidity operations. The mechanical behavior of the membrane is directly related to the changes in humidity levels in membrane and is explored as a part third objective of the dissertation. Numerical studies addressing this objective will be presented. Finally, porous media undergoing physical deposition (or erosion) are common in many applications, including electrochemical systems such as fuel cells (for example, electrodes, catalyst layer s, etc.) and batteries. The transport properties of these porous media are a function of the deposition and the change in the porous structures with time. A dynamic fractal model is introduced to describe such structures undergoing deposition and, in turn, to evaluate the changes in their physical properties as a function of the deposition.
Ph. D.
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Частини книг з теми "PEO - Polymer Electrolytes"

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Raghavan, Prasanth, P. P. Abhijith, N. S. Jishnu, Akhila Das, Neethu T. M. Balakrishnan, Fatima M. J. Jabeen, and Jou-Hyeon Ahn. "Polyethylene Oxide (PEO)-Based Solid Polymer Electrolytes for Rechargeable Lithium-Ion Batteries." In Polymer Electrolytes for Energy Storage Devices, 57–80. First edition | Boca Raton : CRC Press, 2021.: CRC Press, 2021. http://dx.doi.org/10.1201/9781003144793-3.

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Misztal-Faraj, B., F. Krok, J. R. Dygas, Z. Florjañczyk, E. Zygad O-Monikowska, and E. Rogalska. "Dielectric Relaxations in Lithium Composite Polymer Electrolytes Based on PEO and Diethylaluminum Carboxylate." In Materials for Lithium-Ion Batteries, 627–32. Dordrecht: Springer Netherlands, 2000. http://dx.doi.org/10.1007/978-94-011-4333-2_58.

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Kim, Seok, Eun Ju Hwang, Hyung Il Kim, and Soo Jin Park. "Ion Conductivity of Polymer Electrolytes Based on PEO Containing Li Salt and Additive Salt." In Solid State Phenomena, 119–22. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/3-908451-27-2.119.

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Chaurasia, Sujeet Kumar, Abhishek Kumar Gupta, Sarvesh Kumar Gupta, Shivani Gupta, Pramod Kumar, and Manish Pratap Singh. "Investigation on Ionic Conductivity and Raman Spectroscopic Studies of Ionic Liquid Immobilized PEO-Based Polymer Electrolytes." In Springer Proceedings in Materials, 41–49. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-5971-3_5.

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Choi, Young Jin, Sung Hyun Kim, Sang Choul Park, Dong Hyun Shin, Dong Hun Kim, and Ki Won Kim. "A Study on the Electrochemical Properties of PEO-Carbon Composite Polymer Electrolytes for Lithium/Sulfur Battery." In Materials Science Forum, 945–48. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-431-6.945.

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Kocha, Shyam S. "Polymer Electrolyte Membrane (PEM) polymer electrolyte membrane (PEM) Fuel Cells, Automotive Applications polymer electrolyte membrane (PEM) automotive applications." In Encyclopedia of Sustainability Science and Technology, 8231–64. New York, NY: Springer New York, 2012. http://dx.doi.org/10.1007/978-1-4419-0851-3_151.

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Donoso, J. P., M. G. Cavalcante, W. Gorecki, C. Berthier, and M. Armand. "NMR Study of the Polymer Solid Electrolyte PEO (LIBF4)x." In 25th Congress Ampere on Magnetic Resonance and Related Phenomena, 331–32. Berlin, Heidelberg: Springer Berlin Heidelberg, 1990. http://dx.doi.org/10.1007/978-3-642-76072-3_171.

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Kocha, Shyam S. "Polymer Electrolyte Membrane (PEM) Fuel Cells: Automotive Applications." In Fuel Cells and Hydrogen Production, 135–71. New York, NY: Springer New York, 2018. http://dx.doi.org/10.1007/978-1-4939-7789-5_151.

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Kocha, Shyam S. "Polymer Electrolyte Membrane (PEM) Fuel Cells, Automotive Applications." In Fuel Cells, 473–518. New York, NY: Springer New York, 2012. http://dx.doi.org/10.1007/978-1-4614-5785-5_15.

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Kocha, Shyam S. "Polymer Electrolyte Membrane (PEM) Fuel Cells, Automotive Applications." In Encyclopedia of Sustainability Science and Technology, 1–38. New York, NY: Springer New York, 2017. http://dx.doi.org/10.1007/978-1-4939-2493-6_151-3.

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Тези доповідей конференцій з теми "PEO - Polymer Electrolytes"

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Gurusiddappa, J., W. Madhuri, K. Priya Dasan, and R. Padma Suvarna. "PEO/CoO composite polymer electrolytes for lithium batteries." In PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON PHYSICS OF MATERIALS AND NANOTECHNOLOGY ICPN 2019. AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0008994.

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Gondaliya, Nirali, D. K. Kanchan, Poonam Sharma, Manish S. Jayswal, and Prajakta Joge. "Effect of Al2O3 and PEG on relaxation time in PEO-LiCF3SO3 polymer electrolytes." In SOLID STATE PHYSICS: Proceedings of the 56th DAE Solid State Physics Symposium 2011. AIP, 2012. http://dx.doi.org/10.1063/1.4709972.

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Liu, Wei, Ryan Milcarek, Kang Wang, and Jeongmin Ahn. "Novel Structured Electrolyte for All-Solid-State Lithium Ion Batteries." In ASME 2015 13th International Conference on Fuel Cell Science, Engineering and Technology collocated with the ASME 2015 Power Conference, the ASME 2015 9th International Conference on Energy Sustainability, and the ASME 2015 Nuclear Forum. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/fuelcell2015-49384.

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In this study, a multi-layer structure solid electrolyte (SE) for all-solid-state electrolyte lithium ion batteries (ASSLIBs) was fabricated and characterized. The SE was fabricated by laminating ceramic electrolyte Li1.3Al0.3Ti1.7(PO4)3 (LATP) with polymer (PEO)10-Li(N(CF3SO2)2 electrolyte and gel-polymer electrolyte of PVdF-HFP/ Li(N(CF3SO2)2. It is shown that the interfacial resistance is generated by poor contact at the interface of the solid electrolytes. The lamination protocol, material selection and fabrication method play a key role in the fabrication process of practical multi-layer SEs.
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Chapi, Sharanappa, and Devendrappa H. "Enhanced ionic conductivity and optical studies of plasticized (PEO-KCl) solid polymer electrolytes." In NANOFORUM 2014. AIP Publishing LLC, 2015. http://dx.doi.org/10.1063/1.4917630.

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Chandra, Angesh, Alok Bhatt, and Archana Chandra. "Ion Transport Properties of Hot-Pressed Solid Polymer Electrolytes: (1-x) PEO: x NaHCO3." In 2011 International Conference on Nanoscience, Technology and Societal Implications (NSTSI). IEEE, 2011. http://dx.doi.org/10.1109/nstsi.2011.6111776.

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Gupta, Neha, Munesh Rathore, Anshuman Dalvi, Alka B. Garg, R. Mittal, and R. Mukhopadhyay. "Electrical And Electrochemical Characterization Of PEO-Ag[sub 2]SO[sub 4] Composite Polymer Electrolytes." In SOLID STATE PHYSICS, PROCEEDINGS OF THE 55TH DAE SOLID STATE PHYSICS SYMPOSIUM 2010. AIP, 2011. http://dx.doi.org/10.1063/1.3605792.

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Mulay, Nishad, Dahyun Oh, Dan-Il Yoon, and Sang-Joon (John) Lee. "Effect of Cyclic Compression on Mechanical Behavior of Ceramic-in-Polymer Composite Electrolytes for Lithium-Ion Batteries." In ASME 2021 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/imece2021-69196.

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Abstract Composite polymer electrolytes (CPEs) for lithium-ion batteries provide an effective balance of ionic conductivity, mechanical robustness, and safety. Loss of charge capacity, however, is caused by several contributing factors. In this work we specifically examine mechanical changes in the composite electrolyte layer. We apply cyclic compression to mimic stress cycling that is caused by asymmetric volume changes during charging cycles between anode and cathode. Using a representative composite electrolyte formulation consisting of Li6.4La3Zr1.4Ta0.6O12 (LLZTO) at 10 wt. % in polyethylene oxide (PEO) with bis(trifluoromethane) sulfonimide (LiTFSI), we experimentally measure stress-strain characteristics, stress relaxation time, and cyclic compression of a composite electrolyte. We also examine the effect of particle size, by comparing 500 nm vs. 5 μm sizes. At 15% compressive strain, the addition of 500 nm particles increased strain energy density (SED) by a factor of 2.6 and the addition of 5 μm particles increased SED by a factor of 2.9. Both particle sizes showed similar relaxation time constant, but the 5 μm particles showed tighter repeatability than the 500 nm case. Both compositions exhibited continual decline in peak stress beyond 500 cycles of compression at 15% strain. These experiments reveal insights into how cyclic loading can alter the mechanical response of a composite electrolyte, and thereby contribute to the broader understanding of electrochemical and mechanical coupling in lithium-ion batteries.
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Hashim, N. H. A. M., and R. H. Y. Subban. "Studies on conductivity, structural and thermal properties of PEO-LiTFSI polymer electrolytes doped with EMImTFSI ionic liquid." In 3RD INTERNATIONAL SCIENCES, TECHNOLOGY & ENGINEERING CONFERENCE (ISTEC) 2018 - MATERIAL CHEMISTRY. Author(s), 2018. http://dx.doi.org/10.1063/1.5066977.

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Kumar, K. Kiran, Y. Pavani, M. Ravi, S. Bhavani, A. K. Sharma, V. V. R. Narasimha Rao, P. Predeep, Mrinal Thakur, and M. K. Ravi Varma. "Effect of Complexation of NaCl Salt with Polymer Blend (PEO∕PVP) Electrolytes on Ionic Conductivity and Optical Energy Band Gaps." In OPTICS: PHENOMENA, MATERIALS, DEVICES, AND CHARACTERIZATION: OPTICS 2011: International Conference on Light. AIP, 2011. http://dx.doi.org/10.1063/1.3643635.

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Colella, Whitney G., Brian D. James, Jennie M. Moton, Todd G. Ramsden, and Genevieve Saur. "Next Generation Hydrogen Production Systems Using Proton Exchange Membrane Electrolysis." In ASME 2014 12th International Conference on Fuel Cell Science, Engineering and Technology collocated with the ASME 2014 8th International Conference on Energy Sustainability. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/fuelcell2014-6649.

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This article details analysis of hydrogen (H2) production based on polymer electrolyte membrane (PEM) electrolysis. This work identifies primary constraints to the success of this production pathway, primary cost drivers, and remaining Research and Development (R&D) challenges. This research assesses the potential to meet U.S. Department of Energy (DOE) H2 production and delivery (P&D) cost goals of $2 to $4/gasoline gallon equivalent (dispensed, untaxed) by 2020. Pathway analysis is performed using the DOE’s main H2A modeling tool, namely, the H2A Production model, which encapsulates the standard methods of energy, emissions, and cost analysis developed by DOE’s H2 and fuel cell technology teams. PEM electrolysis production pathways are analyzed for a distributed, forecourt H2 production system of 1,500 kilograms (kg) of H2 per day, and for a central, large, plant size H2 production system of 50,000 kg H2/day, for both current and future cases. The analysis is based in part on data from a technical and economic survey completed by four different PEM electrolyzer companies. Model results indicate that, for PEM electrolysis, the primary cost drivers are the electricity expenditures to run the electrolyzer and the capital cost of the electrolyzer. In the future within the electrolyzer system, the balance of plant is expected to be a greater source of cost than the electrolyzer stack due to stack reductions facilitated by operation at higher current densities whereas the balance of plant remains similarly sized for the given flow. This balance between size and cost of the stack versus balance of plant could also increase difficulties in meeting efficiency improvements in the future. The H2 cost reduction is estimated to be greater moving from a Current case to a Future case, compared with moving from a Forecourt case to a Central case.
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Звіти організацій з теми "PEO - Polymer Electrolytes"

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Jamieson, Matthew. Polymer Electrolyte Membrane (PEM) operations. Office of Scientific and Technical Information (OSTI), January 2023. http://dx.doi.org/10.2172/1922943.

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Wheeler, D., and G. Sverdrup. 2007 Status of Manufacturing: Polymer Electrolyte Membrane (PEM) Fuel Cells. Office of Scientific and Technical Information (OSTI), March 2008. http://dx.doi.org/10.2172/924988.

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Munshi, M. Z., and Boone B. Owens. A Study into the Effect of Humidity on (PEO)8.LiCF3SO3 Solid Polymer Electrolyte. Fort Belvoir, VA: Defense Technical Information Center, January 1987. http://dx.doi.org/10.21236/ada176212.

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