Download or read book Ion Transport in Semicrystalline Solid Polymer Electrolytes written by Shan Cheng and published by . This book was released on 2014 with total page 376 pages. Available in PDF, EPUB and Kindle. Book excerpt: Solid polymer electrolytes (SPEs) with both high room temperature ionic conductivity and mechanical integrity are highly desirable for all-solid-state lithium batteries. Linear polyethylene oxide (PEO) represents the simplest yet most attractive solvating polymer due to its capability to form complex with a selected number of alkali metal salt, especially lithium salt. The ether oxygen on PEO backbone coordinates with Li+ and the transport of the latter is facilitated through segmental motion of the polymer chain. However, the highly crystalline nature due to stereoregularity and flexibility of the polymer chain complicate the ion transport mechanism. PEO crystallization has been long considered to be detrimental to ion transport as it results in a decrease of the effective fraction of amorphous conducting phase, slower polymer chain dynamics and more tortuous pathways for ion transport. However, a quantitative analysis of crystallization effect on the ionic conductivity is challenging since these factors are always coupled. In this dissertation, we demonstrated that the two factors, namely tethered chain/dynamic and tortuosity/structural effects can be decoupled by preparing polymer membranes with controlled crystal orientation and measuring the in-plane and through-plane conductivity of the orientated membrane. Moderate conductivity anisotropy as a result of PEO lamellar orientation was first observed in a solution cast PEO SPE. We further used graphene oxide to enhance the crystal orientation, hence the conductivity anisotropy. To quantitatively characterize the crystallization effect, a model electrolyte system consists of PEO single crystals with well controlled crystal structure, size, crystallinity and orientation were fabricated. Ion conduction was confined within the chain fold region, and guided by the crystalline lamellae. We demonstrated that at low ion content, the in-plane conductivity was 1000-2000 times greater than through-plane one due to the tortuosity effect, which was described using Nielsen's permeability model. Contradictory to the general view, the dynamic effect was negligible at moderate ion contents and the overall conductivity was mainly controlled by crystal orientation, strong Li-PEO interaction and Li+ aggregation. Our results demonstrated that semicrystalline polymer can be viewed as a two phase model which morphologically mimicking the popular systems such as block copolymers and polyolefin porous membranes. By controlling crystallization behavior, mechanically robust semi-crystalline SPE with high room temperature conductivity is feasible.
Download or read book Study of Ion Transport in Semicrystalline Polymer Electrolytes written by Ela Livshits and published by . This book was released on 2006 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Polymer based Solid State Batteries written by Daniel Brandell and published by Walter de Gruyter GmbH & Co KG. This book was released on 2021-07-19 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent years has seen a tremendous growth in interest for solid state batteries based on polymer electrolytes, with advantages of higher safety, energy density, and ease of processing. The book explains which polymer properties guide the performance of the solid-state device, and how these properties are best determined. It is an excellent guide for students, newcomers and experts in the area of solid polymer electrolytes.
Download or read book De Brettes seigneurs du Cros de Cieux de Masrocher etc marquis de Brettes du Cros en Limosin written by and published by . This book was released on with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Biopolymer Electrolytes written by Sudhakar Y N and published by Elsevier. This book was released on 2018-06-09 with total page 194 pages. Available in PDF, EPUB and Kindle. Book excerpt: Biopolymer Electrolytes: Fundamentals and Applications in Energy Storage provides the core fundamentals and applications for polyelectrolytes and their properties with a focus on biopolymer electrolytes. Increasing global energy and environmental challenges demand clean and sustainable energy sources to support the modern society. One of the feasible technologies is to use green energy and green materials in devices. Biopolymer electrolytes are one such green material and, hence, have enormous application potential in devices such as electrochemical cells and fuel cells. Features a stable of case studies throughout the book that underscore key concepts and applications Provides the core fundamentals and applications for polyelectrolytes and their properties Weaves the subject of biopolymer electrolytes across a broad range of disciplines, including chemistry, chemical engineering, materials science, environmental science, and pharmaceutical science
Download or read book Ion Transport in the Polymer Electrolytes Formed Between Poly ethylene Succinate and Lithium Tetrafluoroborate written by R. Dupon and published by . This book was released on 1983 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt: Solid electrolyte complexes of poly(ethylene succinate), PESc, and LiBF4 were proposed from the melt and found to be the compound amorphous over the polymer repeat unit to salt formula unit range of 1:1 to 3:1. Preparations with larger amounts of salt contained a pure salt phase, and at salt concentrations below the 3:1 ratio, free crystalline polymer was observed. Within the 1:1 to 3:1 concentration range, increasing salt concentration was accompanied by decreasing conductivity, and increasing glass transition temperatures. This behavior is discussed in terms of a Gibbs-Adams-like excess entropy model. (Author).
Download or read book Rational Design of Nanostructured Polymer Electrolytes and Solid Liquid Interphases for Lithium Batteries written by Snehashis Choudhury and published by Springer Nature. This book was released on 2019-09-25 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis makes significant advances in the design of electrolytes and interfaces in electrochemical cells that utilize reactive metals as anodes. Such cells are of contemporary interest because they offer substantially higher charge storage capacity than state-of-the-art lithium-ion battery technology. Batteries based on metallic anodes are currently considered impractical and unsafe because recharge of the anode causes physical and chemical instabilities that produce dendritic deposition of the metal leading to catastrophic failure via thermal runaway. This thesis utilizes a combination of chemical synthesis, physical & electrochemical analysis, and materials theory to investigate structure, ion transport properties, and electrochemical behaviors of hybrid electrolytes and interfacial phases designed to prevent such instabilities. In particular, it demonstrates that relatively low-modulus electrolytes composed of cross-linked networks of polymer-grafted nanoparticles stabilize electrodeposition of reactive metals by multiple processes, including screening electrode electrolyte interactions at electrochemical interfaces and by regulating ion transport in tortuous nanopores. This discovery is significant because it overturns a longstanding perception in the field of nanoparticle-polymer hybrid electrolytes that only solid electrolytes with mechanical modulus higher than that of the metal electrode are able to stabilize electrodeposition of reactive metals.
Download or read book Polymerized Ionic Liquids written by Ali Eftekhari and published by Royal Society of Chemistry. This book was released on 2017-09-18 with total page 564 pages. Available in PDF, EPUB and Kindle. Book excerpt: The series covers the fundamentals and applications of different smart material systems from renowned international experts.
Download or read book Ion Transport in Liquid Crystalline Polymer Electrolytes written by Gillian S. McHattie and published by . This book was released on 1997 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Polymer Electrolytes and their Composites for Energy Storage Conversion Devices written by Achchhe Lal Sharma and published by CRC Press. This book was released on 2022-11-28 with total page 276 pages. Available in PDF, EPUB and Kindle. Book excerpt: Polymer Electrolytes and their Composites for Energy Storage/Conversion Devices presents a state-of-the-art overview of the research and development in the use of polymers as electrolyte materials for various applications. It covers types of polymer electrolytes, ion dynamics, and the role of dielectric parameters and a review of applications. Divided into two parts, the first part of the book focuses on the types of polymer electrolytes, ion dynamics, and the role of dielectric parameters, while the second part provides a critical review of applications based on polymer electrolytes and their composites. This book: Presents the fundamentals of polymer composites for energy storage/conversion devices Explores the ion dynamics and dielectric properties role in polymer electrolytes Provides detailed preparation methods and important characterization techniques to evaluate the electrolyte potential Reviews analysis of current updates in polymer electrolytes Includes various applications in supercapacitor, battery, fuel cell, and electrochromic windows The book is aimed at researchers and graduate students in physics, materials science, chemistry, materials engineering, energy storage, engineering physics, and industry.
Download or read book Polymer Electrolytes written by Fiona M. Gray and published by . This book was released on 1997 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first book in the RSC Materials Monographs Series, Polymer Electrolytes brings together the latest research in this important subject. The emphasis is on practical materials and it includes an excellent classification of polymer electrolytes, a comprehensive look at material types and an important discussion of the commercial prospects. The text is designed for research workers from a variety of disciplines and looks at some of the history as well as the future of the subject, including reference to computer simulation. Overall, Polymer Electrolytes is an important review of the structural, physical and electrical properties of the materials which are competing for a place in the future energy generation, storage and distribution markets.
Download or read book Crystalline Polymer and Small Molecule Electrolytes written by David Andrew Ainsworth and published by . This book was released on 2010 with total page 290 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Ion Transport and Structure in Polymer Electrolytes with Applications in Lithium Batteries written by Mahati Chintapalli and published by . This book was released on 2016 with total page 141 pages. Available in PDF, EPUB and Kindle. Book excerpt: When mixed with lithium salts, polymers that contain more than one chemical group, such as block copolymers and endgroup-functionalized polymers, are promising electrolyte materials for next-generation lithium batteries. One chemical group can provide good ion solvation and transport properties, while the other chemical group can provide secondary properties that improve the performance characteristics of the battery. Secondary properties of interest include non-flammability for safer lithium ion batteries and high mechanical modulus for dendrite resistance in high energy density lithium metal batteries. Block copolymers and other materials with multiple chemical groups tend to exhibit nanoscale heterogeneity and can undergo microphase separation, which impacts the ion transport properties. In block copolymers that microphase separate, ordered self-assembled structures occur on longer length scales. Understanding the interplay between structure at different length scales, salt concentration, and ion transport is important for improving the performance of multifunctional polymer electrolytes. In this dissertation, two electrolyte materials are characterized: mixtures of endgroup-functionalized, short chain perfluoropolyethers (PFPEs) and lithium bis(trifluoromethanesulfonyl) imide (LiTFSI) salt, and mixtures of polystyrene-block-poly(ethylene oxide) (PS-b-PEO; SEO) and LiTFSI. The PFPE/LiTFSI electrolytes are liquids in which the PFPE backbone provides non-flammability, and the endgroups resemble small molecules that solvate ions. In these electrolytes, the ion transport properties and nanoscale heterogeneity (length scale ~1 nm) are characterized as a function of endgroup using electrochemical techniques, nuclear magnetic resonance spectroscopy, and wide angle X-ray scattering. Endgroups, especially those containing PEO segments, have a large impact on ionic conductivity, in part because the salt distribution is not homogenous; we find that salt partitions preferentially into the endgroup-rich regions. On the other hand, the SEO/LiTFSI electrolytes are fully microphase-separated, solid, lamellar materials in which the PS block provides mechanical rigidity and the PEO block solvates the ions. In these electrolytes longer length scale structure (~10 nm - 1 [mu]m) influences ion transport. We study the relationships between the lamellar grain size, salt concentration, and ionic conductivity using ac impedance spectroscopy, small angle X-ray scattering, electron microscopy, and finite element simulations. In experiments, decreasing grain size is found to correlate with increasing salt concentration and increasing ionic conductivity. Studies on both of these polymer electrolytes illustrate that structure and ion transport are closely linked.
Download or read book Fast Ion Transport in Solids written by B. Scrosati and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 375 pages. Available in PDF, EPUB and Kindle. Book excerpt: The main motivation for the organization of the Advanced Research Workshop in Belgirate was the promotion of discussions on the most recent issues and the future perspectives in the field of Solid State lonics. The location was chosen on purpose since Belgirate was the place were twenty years ago, also then under the sponsorship of NATO, the very first international meeting on this important and interdisciplinary field took place. That meeting was named "Fast Ion Transport in Solids" and gathered virtually everybody at that time having been active in any aspect of motion of ions in solids. The original Belgirate Meeting made for the first time visible the technological potential related to the phenomenon of the fast ionic transport in solids and, accordingly, the field was given the name "Solid State lonics". This field is now expanded to cover a wide range of technologies which includes chemical sensors for environmental and process control, electrochromic windows, mirrors and displays, fuel cells, high performance rechargeable batteries for stationary applications and electrotraction, chemotronics, semiconductor ionics, water electrolysis cells for hydrogen economy and other applications. The main idea for holding an anniversary meeting was that of discussing the most recent issues and the future perspectives of Solid State lonics just twenty years after it has started at the same location on the lake Maggiore in North Italy.
Download or read book Synthesis and Characterization of Solid Polymer Electrolytes written by Anji Reddy Polu and published by LAP Lambert Academic Publishing. This book was released on 2012-08 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ion conducting polymer electrolytes in thin flexible forms show great technological potentials to fabricate all-solid-state mini/micro electrochemical power sources viz. batteries, fuel cells, supercapacitors etc. This book contains the synthesis and characterization of solid polymer electrolytes, is mainly focused on the objectives: to develop some new Mg2+ ion conducting solid polymer and composite polymer electrolytes using a novel solution casting technique; to characterize these materials using various models and experimental techniques; to understand the ion transport properties; subsequently, to employ these solid polymer electrolytes in the fabrication of solid state batteries and study the cell performances under constant load. This book is also provide the basic ideas of ion conduction mechanism in polymer electrolytes and also explained various models for transport phenomenon.
Download or read book Handbook Of Solid State Batteries And Capacitors written by M Z A Munshi and published by World Scientific. This book was released on 1995-05-11 with total page 739 pages. Available in PDF, EPUB and Kindle. Book excerpt: Solid state power sources have developed remarkably in the last three decades owing to improvements in technology and a greater understanding of the underlying basic sciences. In particular, a greater impetus has recently been placed in developing and commercializing small, lightweight, and highly energetic solid state power sources driven by demands from portable consumer electronics, medical technology, sensors, and electric vehicles. This comprehensive handbook features contributions by forerunners in the field of solid state power source technology from universities, research organizations, and industry. It is directed at the physicist, chemist, materials scientist, electrochemist, electrical engineer, science students, battery and capacitor technologists, and evaluators of present and future generations of power sources, as a reference text providing state-of-the-art reviews on solid state battery and capacitor technologies, and also insights into likely future developments in the field. The volume covers a comprehensive series of articles that deal with the fundamental aspects and experimental aspects of solid state power sources, an in-depth discussion on the state of the various technologies, and applications of these technologies. A description of the recent developments on solid state capacitor technology, and a comprehensive list of references in each and every article will help the reader with an encyclopedia of hidden information. The organization of the material has been carefully divided into thirty-one chapters to ensure that the handbook is thoroughly comprehensive and authoritative on the subject for the reader.
Download or read book Ion Transport in Polymer Electrolytes written by Fei Fan and published by . This book was released on 2015 with total page 199 pages. Available in PDF, EPUB and Kindle. Book excerpt: Batteries with superior performance will advance many technologies, such as the field of energy storage and electrochemical devices. Traditional lithium ion batteries based on liquid electrolytes have intrinsic problems such as leaking, dendrite growth, and those problems are associated with fire or even explosion hazard. Extensive efforts have been devoted into the development of solid polymer electrolytes (SPEs), which would not only reduce the size and weight of the batteries, but also solve safety related issues. However, none of current dry SPEs have reached the desired conductivity of 10-3 [0.001] S/cm at ambient temperature. The ion conductivity is controlled by two parameters, the free ion concentration and ion diffusivity. Despite the generally accepted theory that ion diffusion is facilitated by the segmental relaxation of the polymer, the mechanism of ion transport in SPEs is not completely understood. In this dissertation, the ion transport in different SPEs systems were studied with a combination of experimental techniques: dielectric spectroscopy, differential scanning calorimetry and rheology. The ion transport mechanism was investigated in poly(propylene glycol) (PPG) doped with LiClO4 [lithium perchlorate]. A comprehensive analysis was performed by systematically varying the temperature, pressure, polymer molecular weight and salt concentration. It was found that the ion transport was controlled by the segmental relaxation of the "ion-rich" phase in the system, which obeyed the traditional theory. On the contrary, decoupling was observed in several carbonate and styrene based polymer electrolytes. Analysis indicated that the decoupling feature might be related to the packing frustration in those systems. Polymerized ionic liquids (PolyILs) offer an opportunity of combining the high conductivity of ionic liquids and the superior mechanical strength of polymer. Unlike their small molecule analogue-aprotic ionic liquids, decoupling feature was observed in studied PolyILs. The variation of the pendant group structures altered the fragility index of the samples and thus the degree of decoupling. Unraveling the mechanisms of the ion transport and structure-property relationship in SPEs is of obvious fundamental and industrial importance. Findings in this work suggested new routes for future polymer electrolytes design of desired properties.
