Download or read book Custom cell component Design and Development for Rechargeable Lithium sulfur Batteries written by Sheng-Heng Chung and published by . This book was released on 2014 with total page 468 pages. Available in PDF, EPUB and Kindle. Book excerpt: Development of alternative cathodes that have high capacity and long cycle life at an affordable cost is critical for next generation rechargeable batteries to meet the ever-increasing requirements of global energy storage market. Lithium-sulfur batteries, employing sulfur cathodes, are increasingly being investigated due to their high theoretical capacity, low cost, and environmental friendliness. However, the practicality of lithium-sulfur technology is hindered by technical obstacles, such as short shelf and cycle life, arising from the shuttling of polysulfide intermediates between the cathode and the anode as well as the poor electronic conductivity of sulfur and the discharge product Li2S. This dissertation focuses on overcoming some of these problems. The sulfur cathode involves an electrochemical conversion reaction compared to the conventional insertion-reaction cathodes. Therefore, modifications in cell-component configurations/structures are needed to realize the full potential of lithium-sulfur cells. This dissertation explores various custom and functionalized cell components that can be adapted with pure sulfur cathodes, e.g., porous current collectors in Chapter 3, interlayers in Chapter 4, sandwiched electrodes in Chapter 5, and surface-coated separators in Chapter 6. Each chapter introduces the new concept and design, followed by necessary modifications and development. The porous current collectors embedded with pure sulfur cathodes are able to contain the active material in their porous space and ensure close contact between the insulating active material and the conductive matrix. Hence, a stable and reversible electrochemical-conversion reaction is facilitated. In addition, the use of highly porous substrates allows the resulting cell to accommodate high sulfur loading. The interlayers inserted between the pure sulfur cathode and the separator effectively intercept the diffusing polysulfides, suppress polysulfide migration, localize the active material within the cathode region, and boost cell cycle stability. The combination of porous current collectors and interlayers offers sandwiched electrode structure for the lithium/dissolved polysulfide cells. By way of integrating the advantages from the porous current collector and the interlayer, the sandwiched electrodes stabilize the dissolved polysulfide catholyte within the cathode region, resulting in a high discharge capacity, long-term cycle stability, and high sulfur loading. The novel surface-coated separators have a polysulfide trap or filter coated onto one side of a commercial polymeric separator. The functional coatings possess physical and/or chemical polysulfide-trapping capabilities to intercept, absorb, and trap the dissolved polysulfides during cell discharge. The functional coatings also have high electrical conductivity and porous channels to facilitate electron, lithium-ion, and electrolyte mobility for reactivating the trapped active material. As a result, effective reutilization of the trapped active material leads to improved long-term cycle stability. The investigation of the key electrochemical and engineering parameters of these novel cell components has allowed us to make progress on (i) understanding the materials chemistry of the applied functionalized cell components and (ii) the electrochemical performance of the resulting lithium-sulfur batteries.
Download or read book Rechargeable Lithium sulfur Batteries with Novel Electrodes Cell Configurations and Recharge Strategies written by Yu-Sheng Su and published by . This book was released on 2013 with total page 284 pages. Available in PDF, EPUB and Kindle. Book excerpt: Entering a new era of green energy, several criteria such as cost, cycle life, safety, efficiency, energy, and power need to be considered in developing electrical energy storage systems for transportation and grid storage. Lithium-sulfur (Li-S) batteries are one of the prospective candidates in this regard as sulfur offers a high theoretical capacity of 1675 mAh g−1 at a safer operating voltage range of ~ 2.1 V and low-cost benefit. This dissertation explores various original designs of novel electrodes, new cell configurations, and recharge strategies that can boost the cycle performance of Li-S cells. An in situ sulfur deposition route has been developed for synthesizing sulfur-carbon composites as cathode materials. This facile synthesis method involves the precipitation of elemental sulfur at the interspaces between carbon nanoparticles in aqueous solution at room temperature. Thus, a sulfur/multi-wall carbon nanotube (MWCNT) composite cathode with high-rate cyclability has been synthesized by the same process. Due to the self-weaving behavior of MWCNTs, extra cell components such as binders and current collectors are rendered unnecessary, thereby streamlining the electrode manufacturing process and decreasing the cell weight. A novel Li-S cell configuration with a carbon interlayer inserted between the separator and cathode has been designed to enhance the battery cyclability as well. A conductive MWCNT interlayer acting as a pseudo-upper current collector not only reduces the charge transfer resistance of sulfur cathodes significantly, but also localizes and retains the dissolved active material during cycling. Moreover, with a bi-functional microporous carbon paper intrerlayer, we observe a significant improvement not only in the active material utilization but also in capacity retention, without involving complex synthesis or surface modification. The kinetics of the sulfur/long-chain polysulfide redox couple (S8 [double-sided arrow] Li2S4, theoretical capacity = 419 mAh g−1) is experimentally proven to be very fast in the Li-S system. The Li-S cell with a blended carbon interlayer retains excellent cycle stability and possesses a high percentage of active material utilization over 250 cycles at high C rates (up to 15C). The meso-/micro- pores in the interlayer are in charge of accommodating the shuttling polysulfides and offering sufficient electrolyte accessibility. An appropriate and applicable way to recharge Li-S cells within the lower plateau region has been designed to offer tremendous improvement with various Li-S battery systems. Adjusting the charging condition led to long cycle life (over 500 cycles) with excellent capacity retention (> 99%) by inhibiting the electrochemical reactions along with polysulfide dissolution. In addition, the redox products determined by ex situ x-ray photoelectron spectroscopy (XPS) further clarify the mechanism of polysulfide formation upon cycling, which is partially different from the general consensus. These approaches of novel electrode designs, new cell configurations, charging strategy, and understanding of the reactions in different discharge steps could progress the development and advancement of Li-S batteries.
Download or read book Design and Analysis of Large Lithium Ion Battery Systems written by Shriram Santhanagopalan and published by Artech House. This book was released on 2014-12-01 with total page 241 pages. Available in PDF, EPUB and Kindle. Book excerpt: This new resource provides you with an introduction to battery design and test considerations for large-scale automotive, aerospace, and grid applications. It details the logistics of designing a professional, large, Lithium-ion battery pack, primarily for the automotive industry, but also for non-automotive applications. Topics such as thermal management for such high-energy and high-power units are covered extensively, including detailed design examples. Every aspect of battery design and analysis is presented from a hands-on perspective. The authors work extensively with engineers in the field and this book is a direct response to frequently-received queries. With the authors’ unique expertise in areas such as battery thermal evaluation and design, physics-based modeling, and life and reliability assessment and prediction, this book is sure to provide you with essential, practical information on understanding, designing, and building large format Lithium-ion battery management systems.
Download or read book Lithium Sulfur Batteries written by and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: BEEST Project: Sion Power is developing a lithium-sulfur (Li-S) battery, a potentially cost-effective alternative to the Li-Ion battery that could store 400% more energy per pound. All batteries have 3 key parts--a positive and negative electrode and an electrolyte--that exchange ions to store and release electricity. Using different materials for these components changes a battery's chemistry and its ability to power a vehicle. Traditional Li-S batteries experience adverse reactions between the electrolyte and lithium-based negative electrode that ultimately limit the battery to less than 50 charge cycles. Sion Power will sandwich the lithium- and sulfur-based electrode films around a separator that protects the negative electrode and increases the number of charges the battery can complete in its lifetime. The design could eventually allow for a battery with 400% greater storage capacity per pound than Li-Ion batteries and the ability to complete more than 500 recharge cycles.
Download or read book Printed Batteries written by Senentxu Lanceros-Méndez and published by John Wiley & Sons. This book was released on 2018-04-23 with total page 270 pages. Available in PDF, EPUB and Kindle. Book excerpt: Offers the first comprehensive account of this interesting and growing research field Printed Batteries: Materials, Technologies and Applications reviews the current state of the art for printed batteries, discussing the different types and materials, and describing the printing techniques. It addresses the main applications that are being developed for printed batteries as well as the major advantages and remaining challenges that exist in this rapidly evolving area of research. It is the first book on printed batteries that seeks to promote a deeper understanding of this increasingly relevant research and application area. It is written in a way so as to interest and motivate readers to tackle the many challenges that lie ahead so that the entire research community can provide the world with a bright, innovative future in the area of printed batteries. Topics covered in Printed Batteries include, Printed Batteries: Definition, Types and Advantages; Printing Techniques for Batteries, Including 3D Printing; Inks Formulation and Properties for Printing Techniques; Rheological Properties for Electrode Slurry; Solid Polymer Electrolytes for Printed Batteries; Printed Battery Design; and Printed Battery Applications. Covers everything readers need to know about the materials and techniques required for printed batteries Informs on the applications for printed batteries and what the benefits are Discusses the challenges that lie ahead as innovators continue with their research Printed Batteries: Materials, Technologies and Applications is a unique and informative book that will appeal to academic researchers, industrial scientists, and engineers working in the areas of sensors, actuators, energy storage, and printed electronics.
Download or read book A Perspective on Lithium Sulfur Battery Design and Development of Power Law Design Tool for Hotspot Mitigation Using Parallel Microchannel Heat Exchanger written by Chase Allen McCreary and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lithium/sulfur cells that offer ultrahigh theoretical specific energy of 2600 W h kg-1 are considered a promising next-generation rechargeable battery system for electrification of transportation. However, commercialization of Li/S cells remains challenging, despite recent advancement in materials development for sulfur electrodes and electrolytes, due to several critical issues including insufficient obtainable specific energy and relatively poor cyclability. This perspective introduces electrode manufacturing and modeling methodologies and their current challenges. The obtainable specific energy of Li/S pouch cells are calculated for several parameters to demonstrate design requirements for high specific energy of >300 W h kg-1. Furthermore, prospects on rational modeling and manufacturing strategies are proposed to establish a new design standard for Li/S batteries. Finally, to address thermal management at cell and package scales, we propose a design tool for engineers in the form of a power law for hotspot mitigation using parallel microchannel heat exchangers. The tool relates local power density to the hydraulic diameter of a local microchannel. This study builds on earlier work by considering a wider range of flow distributions, conduction effects and hotspot power densities in a multivariable regression analysis. A laminar flow regime was considered, with Reynolds numbers between 200 and 2200, while the local hotspot was varied between three and eight times greater than surroundings. A computational analysis of several microchannel heat exchangers designed using this power law demonstrated it could balance temperature to a standard deviation of 2.61% on average over all Reynolds number. Compared to reference models with uniform channel size, the temperature standard deviation was reduced by 69.9% on average over all Reynolds numbers. However, a simultaneous average temperature rise of 11.1% was observed. A similar empirical analysis was conducted to validate the power law experimentally. We show a reduction in temperature standard deviation across a solid copper heat exchanger relative to a reference exchanger. However, the effect was muted significantly, reducing temperature standard deviation by only 21.6%, at the expense of a 48.0% rise in average temperature. Furthermore, we demonstrate power law efficacy is impacted by channel density, indicating the analytical development of the power law may require inclusion of conduction effects.
Download or read book Design Fabrication and Electrochemical Performance of Nanostructured Carbon Based Materials for High Energy Lithium Sulfur Batteries written by Guangmin Zhou and published by Springer. This book was released on 2017-02-09 with total page 131 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book focuses on the design, fabrication and applications of carbon-based materials for lithium-sulfur (Li-S) batteries. It provides insights into the localized electrochemical transition of the “solid-solid” reaction instead of the “sulfur-polysulfides-lithium sulfides” reaction through the desolvation effect in subnanometer pores; demonstrates that the dissolution/diffusion of polysulfide anions in electrolyte can be greatly reduced by the strong binding of sulfur to the oxygen-containing groups on reduced graphene oxide; manifests that graphene foam can be used as a 3D current collector for high sulfur loading and high sulfur content cathodes; and presents the design of a unique sandwich structure with pure sulfur between two graphene membranes as a very simple but effective approach to the fabrication of Li-S batteries with ultrafast charge/discharge rates and long service lives. The book offers an invaluable resource for researchers, scientists, and engineers in the field of energy storage, providing essential insights, useful methods, and practical ideas that can be considered for the industrial production and future application of Li-S batteries.
Download or read book Lithium Sulfur Batteries written by Ram Gupta and published by Elsevier. This book was released on 2022-04-30 with total page 710 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lithium-Sulfur Batteries: Materials, Challenges, and Applications presents the advantages of lithium-sulfur batteries, such as high theoretical capacity, low cost, and stability, while also addressing some of the existing challenges. Some of the challenges are low electrical conductivity, the possible reaction of sulfur with lithium to form a soluble lithium salt, the formation of the dendrimer, large volume variation of cathode materials during the electrochemical reaction, and shuttle behavior of highly soluble intermediate polysulfides in the electrolyte. This book provides some possible solutions to these issues through novel architecture, using composite materials, doping to improve low conductivity, etc., as well as emphasizing novel materials, architectural concepts, and methods to improve the performance of lithium-sulfur batteries. Covers the state-of-the-art progress on materials, technology, and challenges for lithium-sulfur batteries Presents novel synthetic approaches, characterizations, and applications of nanostructured and 2D nanomaterials for energy applications Provides fundamentals of electrochemical behavior and their understanding at nanoscale for emerging applications in lithium-sulfur batteries
Download or read book An Integrated Development of High capacity Lithium sulfur Li S Batteries written by Chi-Hao Chang (Ph. D.) and published by . This book was released on 2018 with total page 308 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lithium-sulfur (Li-S) batteries have been receiving great recognition for the past few years. This is largely due to the fact that sulfur is an environmentally harmless, and cost-effective element in high abundance. Most importantly, it offers the highest capacity among all solid-state cathode materials. However, the poor electrochemical utilization resulting from the low active material conductivity, and fast capacity fade caused by the freely migrating polysulfides (Li2S [subscript n], 4 ≤ n ≤ 8) limit the practical implementation of Li-S battery technology to replace the current lithium-ion technology. This dissertation focuses on improving the electrochemical performance by developing new battery materials and advanced cell components for the Li-S-cell. First, a simple method is presented to design a thin coating layer on the cathode-side of the polymeric separator, which significantly limits the polysulfide migration. The functional coating layer offers either physical trapping capabilities or chemical immobilization toward migrating polysulfide species within the cathode region during cycling, resulting in a great improvement on discharge capacity and cycling performance. Second, a sophisticated cathode design is proposed to increase the sulfur loading and enhance the areal capacity. A facile procedure was used to integrate polysulfide trapping layers and polysulfide blocking layers into the sulfur cathode of the Li-S cell. The designed cathode, also called "the tandem (layer-by-layer) cathode," not only efficiently utilizes the active material but also effectively suppresses the polysulfide migration. Third, a new electrolyte additive was successfully synthesized to mitigate the polysulfide migration. The electrolyte additive and polysulfides form bulkier polysulfide complexes that are then size-selectively sieved by the separator. Moreover, a protected layer/coating abundant with functional groups of high lithium affinity effectively stabilize the lithium-metal anode surface and improve the reversibility of the lithium-metal cell. Additionally, a new polymer/graphene composite was synthesized and used as a new cathode material for the Li-S chemistry, which also shows better electrochemical performance compared to that from the elemental sulfur cathode. Finally, several techniques are utilized and integrated to assemble a practically viable Li-S battery cell prototype (pouch-cell). The electrochemical performance and the morphological changes are also investigated. This work successfully achieves high-capacity Li-S cells, which are able to compete with the conventional lithium-ion batteries.
Download or read book Advanced Battery Development written by and published by . This book was released on 1989 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Handbook of Lithium Ion Battery Pack Design written by John T. Warner and published by Elsevier. This book was released on 2024-05-15 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Handbook of Lithium-Ion Battery Pack Design: Chemistry, Components, Types and Terminology,?Second Edition provides a clear and concise explanation of EV and Li-ion batteries for readers that are new to the field. The second edition expands and updates all topics covered in the original book, adding more details to all existing chapters and including major updates to align with all of the rapid changes the industry has experienced over the past few years. This handbook offers a layman’s explanation of the history of vehicle electrification and battery technology, describing the various terminology and acronyms and explaining how to do simple calculations that can be used in determining basic battery sizing, capacity, voltage, and energy. By the end of this book the reader will have a solid understanding of the terminology around Li-ion batteries and be able to undertake simple battery calculations. The book is immensely useful to beginning and experienced engineers alike who are moving into the battery field. Li-ion batteries are one of the most unique systems in automobiles today in that they combine multiple engineering disciplines, yet most engineering programs focus on only a single engineering field. This book provides the reader with a reference to the history, terminology and design criteria needed to understand the Li-ion battery and to successfully lay out a new battery concept. Whether you are an electrical engineer, a mechanical engineer or a chemist, this book will help you better appreciate the inter-relationships between the various battery engineering fields that are required to understand the battery as an Energy Storage System. It gives great insights for readers ranging from engineers to sales, marketing, management, leadership, investors, and government officials. Adds a brief history of battery technology and its evolution to current technologies? Expands and updates the chemistry to include the latest types Discusses thermal runaway and cascading failure mitigation technologies? Expands and updates the descriptions of the battery module and pack components and systems?? Adds description of the manufacturing processes for cells, modules, and packs? Introduces and discusses new topics such as battery-as-a-service, cell to pack and cell to chassis designs, and wireless BMS?
Download or read book Advanced Batteries written by Yuan Yang and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Rechargeable batteries are vital in solving imminent energy and environmental issues. Advanced batteries with superior performance and new functionality are desired for applications including novel electronics, electric vehicles, and smart grids. In this thesis, our work on designing novel materials, structures and devices for advanced batteries are presented. In the first part, progresses on high energy lithium sulfur (Li-S) batteries are presented and discussed. The Li-S battery has a specific energy three to five times that of state-of-the-art Li-ion batteries. However, the battery has a poor cycle life due to limitations in the sulfur cathode. To improve the performance of Li-S battery, several nanostructured sulfur cathode have been proposed and realized, including hollow carbon nanofiber-encapsulated sulfur and conductive polymer-wrapped mesoporous carbon/sulfur composite. Discharge capacity of 900 mAh/g and cycle retention of 85% per 100 cycles have been achieved. Moreover, the reaction mechanism of Li-S battery is studied by in-situ X-ray diffraction and imaging. It has been found that results based on in-situ techniques are quite different from previous ex-situ results and common opinions. These results illustrate the importance of in-situ studies and can help guide future designs of Li-S batteries. In the second part, our results on Li2S are presented. Li2S can avoid the safety issue of metallic lithium anode in Li-S batteries. Furthermore, Li2S has capacity one order of magnitude higher than current oxide/phosphate cathodes of Li-ion batteries, and thus leads to rechargeable batteries with specific energy four to six times that of commercial Li-ion batteries. However, Li2S is both electronic and ionically insulating. By using either nanostructures or charging to high potential in the initial cycle, we demonstrate two approaches to activate Li2S to be electrochemically active. Discharge capacity over 800 mAh/g has been achieved and capacity retention as high as 75% per 100 cycles are demonstrated with a discharge capacity of ~550 mAh/g. In the last part, our work on transparent Li-ion batteries is presented as a progress at the device level. Transparent devices are one of the future trends for electronics. As a critical component in electronics, the battery is not transparent yet as both electrode materials and metallic substrate are opaque. We fabricate a grid-like electrode by microfluidics-assisted method to solve this issue. As lines in the grid are smaller than eye's resolution and the gap among lines is filled with transparent PDMS, the whole electrode appears transparent. Batteries with transparency of 60% and energy density of 10 Wh/L have been demonstrated. The energy density could reach 100 Wh/L by optimization. Moreover, the grid-structured electrodes in the transparent battery are stackable without sacrificing the transparency. Future work includes scaling up and further optimization of full cell operations for commercial products.
Download or read book High energy Lithium sulfur Batteries written by Zhi Wei Seh and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Rechargeable lithium-ion batteries have transformed the world of portable electronics and consumer devices today, but their specific energy and cycle life remain insufficient for many emerging, modern-day applications such as electric vehicles and grid energy storage. Lithium-sulfur (Li-S) batteries represent a very promising technology for these applications because their theoretical specific energy is about 7 times that of lithium-ion batteries today. However, the challenges of S and Li2S cathodes include: (1) the formation of intermediate lithium polysulfide species which dissolve into the electrolyte during cycling and (2) the low electronic conductivity of S and Li2S. Thus, there is an urgent need for novel encapsulation materials and morphologies for these cathodes that can effectively confine the polysulfide species and facilitate electronic conduction. In this thesis, I will present my work on developing high-energy Li-S batteries, from theoretical understanding to materials design. First, I will present results from theoretical ab initio simulations which enable the systematic screening of promising encapsulation materials. Next, I will present four different designs of S and Li2S cathodes. The first design is that of S-TiO2 yolk-shell nanostructures, which uses oxygen-rich TiO2 as the encapsulation material. The novelty of this yolk-shell cathode lies in the precise engineering of internal void space to accommodate the volumetric expansion of S during lithiation, enabling long cycle life of 1,000 cycles to be achieved. The second and third designs: Li2S-graphene oxide and Li2S-polypyrrole composite structures, use oxygen-rich and nitrogen-rich materials respectively to encapsulate fully-lithiated and fully-expanded Li2S cathodes. Using these cathodes, we demonstrate high specific capacity and stable cycling performance over hundreds of cycles. The fourth design: Li2S-TiS2 core-shell nanostructures, uses highly-conductive and sulfur-rich TiS2 as an effective 2D encapsulation material. This cathode not only exhibits high rate capability of 4C (fast charge/discharge in 15 min), but also high areal capacity of 3.0 mAh/cm2, both of which are on par with commercial standards today. These works pave the way for the future development of high-performance and long-lasting rechargeable batteries.
Download or read book Design Optimization and Study on Multiple Electrochemical Systems in Energy Dense Rechargeable Lithium Batteries written by Yi Cui and published by . This book was released on 2019 with total page 290 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lithium-ion batteries (LIBs) are commonly and widely applied in current numerous devices such as smart phones, laptops, electric vehicles and medical devices. The LIBs are considered as a mature technology in todays commercial market bene ted from their uncomplicated lithium intercalation and de-intercalation reactions, stable cycling performance and good working life as energy storage devices and power resources. However, the conventional LIBs with technical limits such as high weight, low lithium utilization and low speci c energy density hit the bottlenecks of further improvements and optimizations for meeting the growing power supply requirements. It is urgent to develop the second generations of rechargeable lithium batteries, which have the bene ts of low cost, high speci c capacity and high energy density with light weight. In this context, lithium-sulfur batteries (LSBs) and lithium-selenium (Li-Se) batteries attract much attention due to the high possibility to meet the requirements of high speci c capacity and high energy density. However, the technical challenges they are facing put some barriers before they can be successfully commercialized. By a brief summary, the challenges to be solved are current low energy density because of requiring large amount of liquid electrolyte, the highly ammability and unsafety of lithium metal, low active material content due to the necessary requirement of carbon and binder, and severe so-called shuttle effect resulting in low Coulombic effciency. Before solving these challenges, Li-S batteries or Li-Se batteries are unlikely to be successfully commercialized in our market. Therefore, numerous research is aimed at solving the challenges and further developing more advanced Li-S and Li-Se battery systems. In the present dissertation, the contributions are mainly focused on sulfur-based and selenium-based materials, which aim to solve the current existing challenges and improve the battery performance, herein obtain a higher potential for application. Four chapters are included in this dissertation, which aim to present the four studied projects. The rst research conducted in this dissertation is developing organo S/Se hybrid materials which require low E/S ratios of liquid electrolyte and show light shuttle effect, therefore indicate promising high energy density and cycling life. Secondly, the tin foil is used as lithium sources instead of metallic lithium anode, then incorporated with sulfur cathode as a full cell. The full cell design provides the potential using a metallic anode other than pure lithium and increase the safety factor of a battery system. In addition, nano-scale selenium/carbon nanotubes composite electrode is synthesized via a chemical reduction method. With the optimization on thickness of the composite electrodes, the Se cathode has an active material content of ~60% and shows stable long cycling life with maximizing the utilization of selenium. The nal research conducted in this dissertation is applying a macro molecule named cyanostar, which has the ability to chemically bind with polysul de species, thereupon to alleviate the shuttle effect in Li-S batteries. With the evidence from chemistry analysis and electrochemical comparison results presented in this dissertation, cyanostar is proven to have the potential for further applications in Li-S batteries.
Download or read book Computational Design of Battery Materials written by Dorian A. H. Hanaor and published by Springer Nature. This book was released on with total page 589 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Development of High energy Cathode Materials for Lithium sulfur Batteries written by Tianren Xu and published by . This book was released on 2013 with total page 121 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book From Solvate to Cell written by Dion Hubble and published by . This book was released on 2019 with total page 142 pages. Available in PDF, EPUB and Kindle. Book excerpt: The lithium-sulfur (Li-S) battery system has been widely lauded as a candidate to replace lithium-ion (Li-ion) technology in weight-critical applications such as electric vehicles, aerospace missions, and personal electronics. The attractiveness of this design comes from its titular active materials, which can theoretically store >2300 Wh/kg in comparison to ~400 Wh/kg for Li-ion. Additionally, sulfur is cheap and earth-abundant, reducing the potential cost and environmental impact of the system. However, despite decades of research, a commercially-competitive Li-S battery remains elusive. This is largely due to functional challenges such as poor conductivity, electrolyte-soluble reaction intermediates, and anode surface passivation, which reduce the capacity, efficiency and cycle life of practical cells. Although many of these issues are specific to Li-S chemistry, contemporary research often borrows heavily from Li-ion conventions in attempting to address them (to varying degrees of success). Alternately, Li-S battery design may be approached from a "bottom-up" or "rational molecular design" perspective, in which the materials, fabrication techniques, and analytical methods are designed de novo based on the unique functional demands of the system. This doctoral dissertation broadly details my efforts to develop and study free-standing gel electrolytes for the Li-S system, successfully integrate them into working devices, and demonstrate their effect on cell performance. Chapter 1 introduces the motivating factors behind this research, basic Li-S operating principles, and major functional challenges. Chapter 2 reviews the existing literature on Li-S chemistry and cell designs, including common strategies to improve cell performance. Chapter 3 presents the design, fabrication, and electrochemical properties of solvate ionogel (SIG) electrolytes based on solvate ionic liquid Li(G4)TFSI and functional poly(ethylene glycol) methacrylates. Chapter 4 explores the structure-property relationships of SIGs with regards to solvent additives and polymer molecular structures. Chapter 5 details the development of quasi-solid-state (QSS) Li-S battery designs through integration of SIGs into sulfur/carbon composite cathodes and porous polypropylene separators, the electrochemical performance of QSS cells, and the origin of their cycling characteristics. Finally, Chapter 6 summarizes these results and their impact, concluding with suggestions for future research that may build upon the work herein.
