Read Books Online and Download eBooks, EPub, PDF, Mobi, Kindle, Text Full Free.
Rational Design Of Nanostructured Polymer Electrolytes And Solid Liquid Interphases For Lithium Batteries
Download Rational Design Of Nanostructured Polymer Electrolytes And Solid Liquid Interphases For Lithium Batteries full books in PDF, epub, and Kindle. Read online Rational Design Of Nanostructured Polymer Electrolytes And Solid Liquid Interphases For Lithium Batteries ebook anywhere anytime directly on your device. Fast Download speed and no annoying ads. We cannot guarantee that every ebooks is available!
Book Synopsis Rational Design of Nanostructured Polymer Electrolytes and Solid–Liquid Interphases for Lithium Batteries by : Snehashis Choudhury
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.
Book Synopsis Rational Design of Nanostructured Polymer Electrolytes and Solid-liquid Interphases for Lithium Batteries by : Snehashis Choudhury
Download or read book Rational Design of Nanostructured Polymer Electrolytes and Solid-liquid Interphases for Lithium Batteries written by Snehashis Choudhury and published by . This book was released on 2019 with total page 239 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.
Book Synopsis Energy Storage Systems Beyond Li-Ion Intercalation Chemistry by : Kai Zhu
Download or read book Energy Storage Systems Beyond Li-Ion Intercalation Chemistry written by Kai Zhu and published by Frontiers Media SA. This book was released on 2021-05-28 with total page 134 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Nanostructures and Nanomaterials for Batteries by : Yu-Guo Guo
Download or read book Nanostructures and Nanomaterials for Batteries written by Yu-Guo Guo and published by Springer. This book was released on 2019-05-17 with total page 379 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book discusses the roles of nanostructures and nanomaterials in the development of battery materials for state-of-the-art electrochemical energy storage systems, and provides detailed insights into the fundamentals of why batteries need nanostructures and nanomaterials. It explores the advantages offered by nanostructure electrode materials, the challenges of using nanostructured materials in batteries, as well as the rational design of nanostructures and nanomaterials to achieve optimal battery performance. Further, it closely examines the latest advances in the application of nanostructures and nanomaterials for future rechargeable batteries, including high-energy and high-power lithium ion batteries, lithium metal batteries (Li-O2, Li-S, Li-Se, etc.), all-solid-state batteries, and other metal batteries (Na, Mg, Al, etc.). It is a valuable reference resource for readers interested in or involved in research on energy storage, energy materials, electrochemistry and nanotechnology.
Book Synopsis Interfaces, Phenomena, and Nanostructures in Lithium Batteries by : Albert R. Landgrebe
Download or read book Interfaces, Phenomena, and Nanostructures in Lithium Batteries written by Albert R. Landgrebe and published by The Electrochemical Society. This book was released on 2001 with total page 370 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Design and Synthesis of Nanostructured Materials for Flexible Lithium-Ion Battery by : Xing Lu
Download or read book Design and Synthesis of Nanostructured Materials for Flexible Lithium-Ion Battery written by Xing Lu and published by . This book was released on 2020 with total page 107 pages. Available in PDF, EPUB and Kindle. Book excerpt: In recent years, continuous progress in electronic devices, especially in wearable devices, has attracted surging attention from the consumer market. Therefore, flexible energy storage was developed to fulfill the needs of new flexible devices with ultra-lightweight and small volume. The very recent products and concepts such as touch screens, roll-up displays, wearable sensors, and even implantable medical devices have shown great potential in flexible applications because of their extreme convenience. However, the development of corresponding power sources largely lags behind these emerging technologies of flexible devices. Lithium-ion batteries (LIBs), owing to high energy density and high operating voltage, have been serving as an ideal power source for flexible devices. Nevertheless, direct implementation of commercial LIBs leads to irreversible deformation of structural integrity, short-circuiting or even severe explosion hazard. Such dilemma originates from the poor flexibility of electrode and electrolyte. For electrode side, current electrode sheets used in LIBs are manufactured by holding active material particles and conductive agents by a small weight fraction of polymeric binders. Such fragile electrode structure could easily lose electrical contact under physical deformation, leading to disintegrated electrode sheets, drastic degradations of electrochemical performance, and even safety issue due to internal short-circuiting. For electrolyte side, LIBs employ nonaqueous liquid electrolyte with high ionic conductivity and excellent electrode wettability. However, the drawbacks of such electrolyte system are also evident: poor ion selectivity, flammability, and leakage issue while being deformed render unsuitability of liquid electrolyte for flexible device application. To fabricate flexible LIBs, the current state-of-the-art research employs two design strategies involving electrode structure. One popular strategy is constructing scaffolding structure using carbonaceous materials to function as supportive matrix for active materials. Given carbon nanotubes (CNTs) as an example, the CNTs possess remarkable electrical conductivity and mechanical strength (elastic modulus: 1 TPa, tensile strength: 100 GPa), which contribute to conductive and flexible electrodes as the high-aspect ratio of CNTs can serve as threading materials. Another strategy is rational architecture design of active materials that are conventionally particulate. For example, vanadium pentoxide nanowires can be readily fabricated into free-standing and binder-free electrode membrane. Nevertheless, the most of strategies above still fall short of practicality due to reduced portion of active materials and consequently compromised energy density. In comparison with the mobile liquid electrolyte, the emerging solid-state electrolytes could largely solve circumventing issues of ion selectivity, flammability and leakage. As one prevailing category, solid polymer electrolytes comprising polymers and lithium salts feature decent manufacturing flexibility. Meanwhile, their poor ionic conductivity (10 8 ~ 10 5S cm 1) could be ameliorated by gel polymer electrolytes with organic solvents (plasticizers) and/or inorganic solid fillers (e.g., SiO2). Nevertheless, the non-conductive fillers block ion-transport pathways while allow partial electrical conduction, limiting the interfacial engineering and compatibility with electrodes. In this dissertation, we tackle the aforementioned critical issues of flexible batteries in two aspects. Firstly, we design and synthesize flexible electrode from prospective of material and architecture. A novel cathode constructed by entangling networks of V2O5, CNTs and polytetrafluoroethylene (PTFE) is design and fabricated. Notably, the resulting flexible battery simultaneously achieves excellent mechanical strength (800 MPa young's module), superior cycle durability (86% retention after 1000 times bending) and intriguing capacity (300 mAh g-1 at 0.25C). Furthermore, a Zr-based metal-organic framework (MOF) possessing open-metal sites (OMSs) was used as the microporous filler to facilitate cation (Li+) conduction in GPL. Compared with the state-of-the-art research, our work significantly enhanced tLi+ of GLP from 0.39 up to 0.66 while maintained 1.5 mS cm 1 ionic conductivity. Notably, a reduced thermal activation energy (from 113 to 76 meV) was observed, suggesting diffusion energy barriers was eased by selective promotion of Li+ conduction. To conclude, flexible Li-ion batterie system research is still at early developing stage. Above work provides rational design and improvement of the current FLIBs system in rather facile and cost-effective way. The methodology we proposed are hoped to bring further innovation toward FLIBs field and be extended to numerous applications in the future.
Book Synopsis Hard X-ray Photoelectron Spectroscopy (HAXPES) by : Joseph Woicik
Download or read book Hard X-ray Photoelectron Spectroscopy (HAXPES) written by Joseph Woicik and published by Springer. This book was released on 2015-12-26 with total page 576 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides the first complete and up-to-date summary of the state of the art in HAXPES and motivates readers to harness its powerful capabilities in their own research. The chapters are written by experts. They include historical work, modern instrumentation, theory and applications. This book spans from physics to chemistry and materials science and engineering. In consideration of the rapid development of the technique, several chapters include highlights illustrating future opportunities as well.
Book Synopsis DESIGN STABLE SOLID-ELECTROLYTE INTERPHASE FOR ANODES IN RECHARGEABLE LITHIUM BATTERIES. by : Yue Gao
Download or read book DESIGN STABLE SOLID-ELECTROLYTE INTERPHASE FOR ANODES IN RECHARGEABLE LITHIUM BATTERIES. written by Yue Gao and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Solid-electrolyte interphase (SEI) is a nanoscale composite layer of organic and inorganic lithium (Li) salts formed on the electrode surface by electrolyte decomposition. It is ionically conductive and electrically insulating, thus allowing facile Li-ion transport and preventing further electrolyte decomposition. Owing to these features, SEI stability is crucial to the performance of rechargeable Li batteries. Unfortunately, SEI layer are unstable for most advanced battery materials, including high-capacity anodes materials (e.g., silicon (Si) and Li) in liquid electrolyte and Li anodes in solid electrolytes (e.g., Li10GeP2S12 (LGPS)). An unstable SEI layer may cause poor battery performance including consumption of active materials and electrolyte, capacity fading, resistance increase., etc. The structure and property of SEI have generally eluded rational control since its formation and growth processes involve a series of complex and competitive electrochemical reactions. The main efforts to addressing this issue have been made on the development of new electrolyte systems to form alternative SEI layers and preformed artificial SEI layers on the electrode surface to replace the electrolyte-derived SEI.This dissertation focuses on intrinsically regulating the chemical composition and nanostructure of SEI for advanced battery materials in conventional electrolyte systems, which enables not only optimized chemical and physical properties of SEI but improved battery performance. This is realized by developing chemical and electrochemical reactive materials and allowing them to participate in the SEI formation. These materials can contribute functional components in the SEI layer and therefore alter the structure and property of the SEI deliberately. The design of functional material is based on the requirement of SEI layers for different anodes. In Chapters 2 and 3, I presented approaches to manipulating the formation process, chemical composition, and morphology of SEI for nano-sized and micro-sized Si anodes, respectively. The SEI layers were fabricated through a covalent anchoring of multiple functional components onto the Si surface, followed by electrochemical decomposition of the functional components and conventional electrolyte. We showed that to covalently bond organic oligomeric species at the surface of nano-sized Si anodes can effectively increase its SEI flexibility and realized an intimate contact between SEI and Si surface (Chapter 2). In the case of micro-sized Si anodes, we reported that to covalently bond a functional salt, N-methyl-N-propyl pyrrolidinium bis(fluorosulfonyl)imide (PYR13FSI), at the surface of micro-sized Si anodes can effectively stabilize the interface and SEI (Chapter 3). In Chapters 4 and 5, we designed chemically and electrochemically active organic polymer, namely poly((N-2,2-dimethyl-1,3-dioxolane-4-methyl)-5-norbornene-exo-2,3-dicarboximide), and polymeric composite containing poly(vinylsulfonyl fluoride-ran-2-vinyl-1,3-dioxolane) and graphene oxide (GO) nanosheets to alter SEI formation process and regulate the composition and nanostructure of SEI for Li metal anodes. The reactive organic polymer and polymeric composite can generate stable SEI layers in situ by reacting with Li to occupy surface sites and then electrochemically decomposing to form nanoscale SEI components. The formed SEI layers presented excellent surface passivation, homogeneity, and mechanical strength. Using the polymer, we can implant polymeric ether species in the electrolyte-derived SEI, enabling improved SEI flexibility and homogeneity. In the case of polymeric composite, the SEI is mainly generated by the composite instead of electrolyte. In this way, we realized an intrinsic control of SEI structure and property. The formed SEI presented excellent homogeneity, mechanical strength, ionic conductivity, and surface passivation.In Chapter 6, we reported a novel approach based on the use of a nanocomposite consisting of organic elastomeric salts (LiO-(CH2O)n-Li) and inorganic nanoparticle salts (LiF, -NSO2-Li, Li2O), which serve as an interphase to protect Li10GeP2S12 (LGPS), a highly conductive but reducible SSE. The nanocomposite is formed in situ on Li via the electrochemical decomposition of a liquid electrolyte, therefore possessing excellent chemical and electrochemical stability, affinity for Li and LGPS, and limited interfacial resistance. We concluded this dissertation work in Chapter 7 and briefly discussed the possible future work.
Book Synopsis Ceramic and Specialty Electrolytes for Energy Storage Devices by : Prasanth Raghavan
Download or read book Ceramic and Specialty Electrolytes for Energy Storage Devices written by Prasanth Raghavan and published by CRC Press. This book was released on 2021-04-04 with total page 335 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ceramic and Specialty Electrolytes for Energy Storage Devices, Volume II, investigates recent progress and challenges in a wide range of ceramic solid and quasi-solid electrolytes and specialty electrolytes for energy storage devices. The influence of these electrolyte properties on the performance of different energy storage devices is discussed in detail. Features: • Offers a detailed outlook on the performance requirements and ion transportation mechanism in solid polymer electrolytes • Covers solid-state electrolytes based on oxides (perovskite, anti-perovskite) and sulfide-type ion conductor electrolytes for lithium-ion batteries followed by solid-state electrolytes based on NASICON and garnet-type ionic conductors • Discusses electrolytes employed for high-temperature lithium-ion batteries, low-temperature lithium-ion batteries, and magnesium-ion batteries • Describes sodium-ion batteries, transparent electrolytes for energy storage devices, non-platinum-based cathode electrocatalyst for direct methanol fuel cells, non-platinum-based anode electrocatalyst for direct methanol fuel cells, and ionic liquid-based electrolytes for supercapacitor applications • Suitable for readers with experience in batteries as well as newcomers to the field This book will be invaluable to researchers and engineers working on the development of next-generation energy storage devices, including materials and chemical engineers, as well as those involved in related disciplines.
Book Synopsis Nanostructured Materials for Next-Generation Energy Storage and Conversion by : Qiang Zhen
Download or read book Nanostructured Materials for Next-Generation Energy Storage and Conversion written by Qiang Zhen and published by Springer Nature. This book was released on 2019-10-10 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt: Volume 3 of a 4-volume series is a concise, authoritative and an eminently readable and enjoyable experience related to lithium ion battery design, characterization and usage for portable and stationary power. Although the major focus is on lithium metal oxides or transition metal oxide as alloys, the discussion of fossil fuels is also presented where appropriate. This monograph is written by recognized experts in the field, and is both timely and appropriate as this decade will see application of lithium as an energy carrier, for example in the transportation sector. This Volume focuses on the fundamentals related to batteries using the latest research in the field of battery physics, chemistry, and electrochemistry. The research summarised in this book by leading experts is laid out in an easy-to-understand format to enable the layperson to grasp the essence of the technology, its pitfalls and current challenges in high-power Lithium battery research. After introductory remarks on policy and battery safety, a series of monographs are offered related to fundamentals of lithium batteries, including, theoretical modeling, simulation and experimental techniques used to characterize electrode materials, both at the material composition, and also at the device level. The different properties specific to each component of the batteries are discussed in order to offer tradeoffs between power and energy density, energy cycling, safety and where appropriate end-of-life disposal. Parameters affecting battery performance and cost, longevity using newer metal oxides, different electrolytes are also reviewed in the context of safety concerns and in relation to the solid-electrolyte interface. Separators, membranes, solid-state electrolytes, and electrolyte additives are also reviewed in light of safety, recycling, and high energy endurance issues. The book is intended for a wide audience, such as scientists who are new to the field, practitioners, as well as students in the STEM and STEP fields, as well as students working on batteries. The sections on safety and policy would be of great interest to engineers and technologists who want to obtain a solid grounding in the fundamentals of battery science arising from the interaction of electrochemistry, solid-state materials science, surfaces, and interfaces.
Book Synopsis Polymer-based Solid State Batteries by : Daniel Brandell
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.
Book Synopsis Rational Design of Composite Cathodes and Functional Electrolytes for High-Energy Lithium-Metal Batteries by : Panpan Dong
Download or read book Rational Design of Composite Cathodes and Functional Electrolytes for High-Energy Lithium-Metal Batteries written by Panpan Dong and published by . This book was released on 2020 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt: Metallic lithium has been considered one of the most attractive anode materials for high-energy batteries because it has a low density (0.53 g cm8́23), the lowest reduction potential (8́23.04 V vs. the standard hydrogen electrode), and a high theoretical specific capacity (3,860 mAh g8́21). Chalcogen elements, such as sulfur and selenium, have been widely reported as promising cathode candidates for next-generation lithium-metal batteries (LMBs) that demonstrate much higher energy density than current lithium-ion batteries. However, lithium0́3chalcogen batteries still suffer from the loss of cathode active materials and the degradation of lithium metal anode owing to the shuttle effects of intermediate products (e.g., polysulfides and polyselenides), leading to fast capacity fading and poor cyclability. Moreover, for lithium metal anodes, the cracking of solid electrolyte interphase (SEI) layer during long cycling results in dead lithium formation and lithium dendrite growth, leading to poor Coulombic efficiency and potential safety issues. The abovementioned challenges hinder the commercialization of LMBs. To address these problems, various strategies have been developed to mitigate the dissolution/diffusion of redox intermediates and stabilize metallic lithium anodes. In this dissertation, sulfur- and selenium-based nanocomposites were synthesized and employed as advanced cathode materials for high-energy LMBs. The correlations between syntheses, properties, and performances of such chalcogen cathode materials were established by various characterization methods such as microstructural analyses, solid-state nuclear magnetic resonance, X-ray photoelectron spectroscopy, and nanoscale X-ray computed tomography. Additionally, the interfacial electrochemistry of lithium metal anodes and ionic liquid0́3based electrolytes is comprehensively investigated, revealing the effective stabilization and protection of lithium anode via the formation of an in situ SEI layer with specific compositions. Moreover, strategies for achieving novel solid polymer electrolytes with improved lithium-ion transference number were demonstrated, paving the way toward safe LMBs by mitigating lithium dendrite growth. This dissertation provides a combined strategy of advanced cathode design, electrolyte engineering, and lithium anode stabilization to develop high-energy LMBs for practical applications.
Book Synopsis Designing Electrolytes for Lithium-Ion and Post-Lithium Batteries by : Władysław Wieczorek
Download or read book Designing Electrolytes for Lithium-Ion and Post-Lithium Batteries written by Władysław Wieczorek and published by CRC Press. This book was released on 2021-06-23 with total page 345 pages. Available in PDF, EPUB and Kindle. Book excerpt: Every electrochemical source of electric current is composed of two electrodes with an electrolyte in between. Since storage capacity depends predominantly on the composition and design of the electrodes, most research and development efforts have been focused on them. Considerably less attention has been paid to the electrolyte, a battery’s basic component. This book fills this gap and shines more light on the role of electrolytes in modern batteries. Today, limitations in lithium-ion batteries result from non-optimal properties of commercial electrolytes as well as scientific and engineering challenges related to novel electrolytes for improved lithium-ion as well as future post-lithium batteries.
Book Synopsis Liquid Electrolyte Chemistry for Lithium Metal Batteries by : Jianmin Ma
Download or read book Liquid Electrolyte Chemistry for Lithium Metal Batteries written by Jianmin Ma and published by John Wiley & Sons. This book was released on 2022-02-09 with total page 299 pages. Available in PDF, EPUB and Kindle. Book excerpt: Liquid Electrolyte Chemistry for Lithium Metal Batteries An of-the-moment treatment of liquid electrolytes used in lithium metal batteries Considered by many as the most-promising next-generation batteries, lithium metal batteries have grown in popularity due to their low potential and high capacity. Crucial to the development of this technology, electrolytes can provide efficient electrode electrolyte interfaces, assuring the interconversion of chemical and electrical energy. The quality of electrode electrolyte interphase, in turn, directly governs the performance of batteries. In Liquid Electrolyte Chemistry, provides a comprehensive look at the current understanding and status of research regarding liquid electrolytes for lithium metal batteries. Offering an introduction to lithium-based batteries from development history to their working mechanisms, the book further offers a glimpse at modification strategies of anode electrolyte interphases and cathode electrolytic interphases. More, by discussing the high-voltage electrolytes from their solvents—organic solvents and ionic liquids—to electrolyte additives, the text provides a thorough understanding on liquid electrolyte chemistry in the remit of lithium metal batteries. Liquid Electrolyte Chemistry for Lithium Metal Batteries readers will also find: A unique focus that reviews the development of liquid electrolytes for lithium metal batteries State-of-the-art progress and development of electrolytes for lithium metal batteries Consideration of safety, focusing the design principles of flame retardant and non-flammable electrolytes Principles and progress on low temperature and high temperature electrolytes Liquid Electrolyte Chemistry for Lithium Metal Batteries is a useful reference for electrochemists, solid state chemists, inorganic chemists, physical chemists, surface chemists, materials scientists, and the libraries that supply them.
Book Synopsis Materials for Lithium-Ion Batteries by : Christian Julien
Download or read book Materials for Lithium-Ion Batteries written by Christian Julien and published by Springer Science & Business Media. This book was released on 2000-10-31 with total page 658 pages. Available in PDF, EPUB and Kindle. Book excerpt: A lithium-ion battery comprises essentially three components: two intercalation compounds as positive and negative electrodes, separated by an ionic-electronic electrolyte. Each component is discussed in sufficient detail to give the practising engineer an understanding of the subject, providing guidance on the selection of suitable materials in actual applications. Each topic covered is written by an expert, reflecting many years of experience in research and applications. Each topic is provided with an extensive list of references, allowing easy access to further information. Readership: Research students and engineers seeking an expert review. Graduate courses in electrical drives can also be designed around the book by selecting sections for discussion. The coverage and treatment make the book indispensable for the lithium battery community.
Book Synopsis Polymer Electrolyte Discovery Via Rational Design and High Throughput Methods by : Michael A. Stolberg
Download or read book Polymer Electrolyte Discovery Via Rational Design and High Throughput Methods written by Michael A. Stolberg and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Storage of electrical energy is a cornerstone in the global endeavor to lower greenhouse gas emissions-in particular, electrochemical energy storage in the form of batteries can enable the electrification of transport through electric vehicles, as well as aid the transition to renewable energy generation such as wind and solar through stabilizing the grid and mitigating intermittency. Lithium-ion batteries, a pioneering technology to enable portable electronics, are seeing increased use in transportation and grid-scale applications due to their high energy density, and greatly decreasing production costs over the past decade. However, current lithium-ion batteries are reaching the theoretical energy density and must adhere to higher safety standards as they see use in larger scale formats. The next generation of cheaper, safer, and more energy-dense batteries will be enabled by advances in electrolytes which are the focus of this work. In this thesis, we focus on solid polymer electrolytes, which have the potential to enable more energy-dense batteries, and display improved safety compared to the highly flammable and toxic liquid electrolytes in use today. We detail our work in two main areas: the rational design of highly dissociative ionenes, and the development of a high throughput platform to increase the scale and speed of polymer electrolyte research. In the former, we investigate the impact of anion dissociation energy on ion conduction in solid polymer electrolytes via a novel class of ionenes prepared using acyclic diene metathesis polymerization of highly dissociative, liquid crystalline, fluorinated aryl sulfonimide-tagged ("FAST") anion monomers. These polyanions form well-ordered lamellae that are thermally stable and provide anionic channels for ion hopping. Electrochemical impedance spectroscopy and differential scanning calorimetry experiments, along with nudged elastic band calculations, suggest that cation motion in these materials operates via an ion hopping mechanism, which is enabled by the highly dissociative nature of FAST anions. In parallel, we developed a high throughput platform to accelerate electrolyte research. We detail the engineering problems and solutions which resulted in an estimated 100X increase in sample throughput with vastly less researcher effort. The platform is then leveraged in two case studies, first by performing the largest one-to-one comparison of lithium and sodium ion conduction in poly(ethylene oxide) to date, and secondly, the platform is employed in a machine learning-guided Bayesian optimization system to explore and optimize the ionic conductivity of electrolytes based upon poly(caprolactone). This work sets the stage for continued automation and data-driven design of polymer electrolytes for safer and more energy-dense batteries.
Book Synopsis Nanostructured Polymer Electrolyte Designs for Lithium-ion Batteries by : Melody A. Morris
Download or read book Nanostructured Polymer Electrolyte Designs for Lithium-ion Batteries written by Melody A. Morris and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lithium-ion batteries (LiBs) have become dominant energy storage devices because of their high energy densities, minimal memory effects, and low self-discharge rates. However, the mechanical failure of the liquid electrolyte present in most commercial LiBs have led to a number of high-profile incidents, including the grounding of the Boeing Dreamliner airplane. To replace the liquid electrolyte, block polymers (BPs), in which one polymer block has mechanical integrity (high glass transition temperature [Tg] and shear modulus) and the other is efficient at solvating and conducting lithium ions, have been harnessed as a way to decouple the competing constraints required in an electrolyte material. Polystyrene-block-poly(oligo-oxyethylene methacrylate) [PS-b-POEM]-based BPs were used throughout these studies. Four approaches have been leveraged in this dissertation work to improve the mechanical and electrochemical properties of BP electrolytes. First, self-doped BP materials have been developed to reduce the concentration polarization in the electrolyte so that only lithium ions were mobile. The lithium conductivity of these materials were similar to the salt-doped BPs upon normalization by the Tg of the conducting block, and strategies to further improve the lithium conductivity are suggested. Second, the lithium and polymer distributions were established quantitatively in a salt-doped BP electrolyte material, and key properties, like the effective Flory-Huggins interaction parameter, were calculated using strong segregation theory. Third, homopolymer-blended BP composite electrolytes were studied as a function of the homopolymer molecular weight. Though blends with lower-molecular-weight homopolymers had higher lithium mobilities, blends with higher-molecular-weight homopolymers showed enhanced ionic conductivity as a result of structural differences. Finally, a BP in which the high-Tg component was replaced with a bio-based alternative, poly(guaiacyl methacrylate), was probed. The conductivity of the bio-based BP was higher than that of the PS-b-POEM BP doped at similar lithium concentrations, and replacement of the PGM with a higher-Tg bio-based component would promote improved conductivities at higher operating temperatures with maintained mechanical robustness. Overall, the work in this dissertation contributed new strategies that promoted the enhancement of mechanical and electrochemical properties in BP electrolytes for next-generation LiBs.
