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Author: Tianren Xu
Publisher:
ISBN:
Category :
Languages : en
Pages : 121
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Author: Tianren Xu
Publisher:
ISBN:
Category :
Languages : en
Pages : 121
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Book Description
Author: Katerina E. Aifantis
Publisher: John Wiley & Sons
ISBN: 9783527630028
Category : Technology & Engineering
Languages : en
Pages : 296
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Book Description
Materials Engineering for High Density Energy Storage provides first-hand knowledge about the design of safe and powerful batteries and the methods and approaches for enhancing the performance of next-generation batteries. The book explores how the innovative approaches currently employed, including thin films, nanoparticles and nanocomposites, are paving new ways to performance improvement. The topic's tremendous application potential will appeal to a broad audience, including materials scientists, physicists, electrochemists, libraries, and graduate students.
Author: Shuru Chen
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Rechargeable lithium-sulfur (Li-S) batteries have attracted great attentionbecause they promise an energy density 3-5 times higher than that of currentstate-of-the-art lithium ion batteries at lower cost. However, current Li-S frequently suffer from low practical energy density, poor cycle life, low efficiency, and high self-discharge. Those issues mainly stem from the poorconductivity of sulfur and its lithiated products, the dissolution and side-reactions of intermediate lithium polysulfides, and the unstable lithium-electrolyte interface.This dissertation focuses on development of high-sulfur-fraction carbon/sulfur composite cathode materials and efficient electrolyte systems for Li-S batteries, aiming to improve both their practical energy densities and electrochemical performance. In Chapter 3, hollow carbon (HC) spheres with extremely high specific volume (>10 cm3 g-1) are shown to accommodate ultrahigh sulfur fraction (~90 wt%) in their nano-scale pores. The obtained HC/S composites enable high areal sulfur loading of up to 6.9 mg cm-2 in the cathode electrode using industry-adopted coating techniques. In addition, a new hydrofluoroether-based electrolyte is shown to significantly mitigate polysulfide dissolution and also to facilitate the electrochemicalreactions of sulfur cathodes. Combined with this new electrolyte, thehigh-sulfur-fraction and high-areal-loading HC/S composite cathode can achieve exceptional performance, which can significantly improve both the cyclability and the practical energy density of the Li-S batteries. In chapter 4, substituting soluble Li polysulfides for conventional Li salts in the commonly used Li-S electrolyte is found to not only contribute extra capacity but also significantly improve the cycling performance of Li-S cells. In chapter 5, a new functional electrolyte system using electrochemically active organosulfides (e.g., dimethyl disulfide) as co-solvents is shown to reduce the required electrolyte amount while at the same time increasing cell capacity. The organosulfides lead to a new reaction pathway for sulfur cathodes, which involves the chemical reactions between organosulfides and sulfur to new intermediate organopolysulfides, followed by their subsequent electrochemical reactions during cell cycling. Through this new mechanism, the functional organosulfide electrolyte not only contributes a significant amount of capacity, but also enables good cathode cyclability by way of an automatic discharge shutoff mechanism. This new functional electrolyte system thus promises high energy density for Li-S batteries.In the appendix, the development of silicon-carbon yolk-shell nanocomposite materials is discussed. These high-performance silicon anode materials can potentially be used to replace the Li anode, which in the long term can improve the cycle life and safety of Li-S batteries.
Author: Muhammad Suleman Tahir
Publisher: Springer Nature
ISBN: 981992796X
Category :
Languages : en
Pages : 231
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Author: Prashant Kumta
Publisher: Elsevier
ISBN: 0128231696
Category : Technology & Engineering
Languages : en
Pages : 624
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Book Description
Lithium-sulfur (Li-S) batteries provide an alternative to lithium-ion (Li-ion) batteries and are showing promise for providing much higher energy densities. Systems utilizing Li-S batteries are presently under development and early stages of commercialization. This technology is being developed in order to provide higher, safer levels of energy at significantly lower costs. Lithium-Sulfur Batteries: Advances in High-Energy Density Batteries addresses various aspects of the current research in the field of sulfur cathodes and lithium metal anode including abundance, system voltage, and capacity. In addition, it provides insights into the basic challenges faced by the system. The book includes novel strategies to prevent polysulfide dissolution in sulfur-based systems while also exploring new materials systems as anodes preventing dendrite formation in Li metal anodes. Provides insight into the basic challenges faced by the materials system Discusses additives and suppressants to prevent dissolution of electrolyes Includes a review of the safety limitations associated with this technology Incorporates a historical perspective into the development of lithium-sulfur batteries
Author: Ram Gupta
Publisher: Elsevier
ISBN: 0323919324
Category : Technology & Engineering
Languages : en
Pages : 710
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Book Description
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
Author: Rui Xu
Publisher:
ISBN:
Category :
Languages : en
Pages : 179
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Book Description
"Energy storage systems play an important role nowadays. Developing batteries with high energy and long cycle life has been an important research part in scientific and engineering field. Lithium ion batteries and the recent rising lithium sulfur batteries demonstrate a huge potential to be the next generation energy storage devices and being substitutes for fossil fuels in electric cars. This dissertation focuses on the development of cathode materials for lithium ion batteries with advanced electrochemical performances, and then on the design of novel lithium sulfur systems which can deliver a capacity five times as much as lithium ion batteries offer. In the first part of the dissertation, advanced cathode materials for lithium-ion batteries were investigated in the aspects of material synthesis and performance test. Li-Mn-rich composite materials have high theoretical capacities (200 - 300 mAh/g). High energy composite material 0.5Li2MnO3·0.5LiMn0.5Ni0.5O2, or written as Li1.5Ni0.25Mn0.75O2.5, was synthesized through a polymer-assisted method and a coprecipitation method in a continuous stirred tank reactor (CSTR). The as-synthesized powder using the polymer-assisted method has a primary particle size in the range of 100-300 nm, and can reach a discharge capacity of around 230 mAh/g at the current density of 5 mA/g, and 170 mAh/g at 20 mA/g. The secondary particles of the composite material synthesized through co-precipitation method were spheres with diameters of around 10 [mu]m, and has an initial capacity of 295 mAh/g. 0.5Li2MnO3·0.5LiMn1/3Ni1/3Co1/3O2 powder was synthesized via a spray pyrolysis method. The as-prepared material was spheres with a high porosity. The first discharge capacity of the material was over 300 mAh/g. High voltage spinel cathode material has a high working potential and thus can generate a high energy. LiNi0.24Mn1.76O4 was prepared through a simple solid state method and the as-prepared material was tested between 3 - 4.8 V. The material has excellent rate capabilities and cycling stabilities. Nanofiber cathode materials were successfully produced using the electrospinning method. Through controlling a series of electrospinning parameters, LiFePO4 and high voltage spinel LiNi0.5Mn1.5O4 (LMNO) nanofibers with a diameter as thin as 50 - 100 nm were fabricated followed by a subsequent heat-treating procedure. The well-separated nanofiber precursors supress LiNi0.5Mn1.5O4 particles' growth and aggregation during the heating procedure, and led to good performances of high capacities and excellent rate capabilities of the final LMNO nanofibers. At a current density of 27 mA g−1, the initial discharge capacity of the cell was 130 mAh g−1 (charge-discharge between 3.5 - 4.8 V) and 300 mAh g−1 (2.0 - 4.8 V). In the second part of the dissertation, lithium sulfur systems were investigated due to their high theoretical capacity and the use of abundant and safe sulfur cathode material. To understand the chemistry and problems within a lithium-sulfur cell, various techniques were applied to study the system including SEM, TEM, XRD, Raman spectroscopy and etc. It was identified that one of the main problems in a Li-S cell that hinders its achieving a high performance is the so-called 'shuttle reactions'. It was resulted from the dissolution of lithium polysulfides into the electrolyte and migration to the lithium anode. Another issue was the difficulty of fully discharge a sulfur cathode due to the low conductivity of reduction product, lithium sulfide. Several approaches aiming to resolve the problems were designed to improve the cell's coulombic efficiency, capacity and cycle life. The electrochemical performances of lithium sulfur batteries and electrochemistry mechanisms within the cell system were investigated in the following aspects: 1) Impact of liquid electrolytes (including carbonate-based electrolytes and ether-based electrolytes) 2) Impact of the LiNO3 additive as a shuttle inhibitor 3) Impact of the sulfur/carbon ratio in the electrode 4) Impact of different carbon forms in the electrode 5) Impact of impregnating sulfur in the carbon pores in the electrode 6) Impact of adding polysulfide adsorbents 7) Surface morphology change of the lithium anode and the sulfur cathode 8) Composition of lithium polysulfide solution and powder 9) Self-discharge phenomenon 10) Cell intermediate and interface characterization. Last but not least, we developed a novel polysulfide-based electrolyte that prevents the performance degradation inherent to Li-S batteries by self-healing. By creating a dynamic equilibrium between the dissolution and precipitation of lithium polysulfides at the sulfur/electrolyte interface, the Li-S cells were capable of delivering a superior capacity (1450 mAh/g, sulfur), which along with the high coulombic efficiency and excellent cycle life make our cells among the best performing Li-S cells. In addition, the present technology eliminates the need for complicated and costly electrode preparation. The polysulfides in the electrolyte eliminate the need for traditional lithium salts"--Pages vi-ix.
Author: Rezan Demir-cakan
Publisher: #N/A
ISBN: 1786342510
Category : Science
Languages : en
Pages : 370
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Book Description
'This book provides an excellent review and analysis of the latest information on rechargeable Li-S battery research. With a clear and concise writing style and in-depth technical material , this book will appeal to undergraduates and graduates, researchers, chemists, material scientists, and physicists working in the field of energy storage, especially those with an interest in Li-S battery technology.'IEEE Electrical Insulation MagazineLithium-sulfur (Li-S) batteries give us an alternative to the more prevalent lithium-ion (Li-ion) versions, and are known for their observed high energy densities. Systems using Li-S batteries are in early stages of development and commercialization however could potentially provide higher, safer levels of energy at significantly lower cost.In this book the history, scientific background, challenges and future perspectives of the lithium-sulfur system are presented by experts in the field. Focus is on past and recent advances of each cell compartment responsible for the performance of the Li-S battery, and includes analysis of characterization tools, new designs and computational modeling. As a comprehensive review of current state-of-play, it is ideal for undergraduates, graduate students, researchers, physicists, chemists and materials scientists interested in energy storage, material science and electrochemistry.
Author:
Publisher: John Wiley & Sons
ISBN: 1789450136
Category : Science
Languages : en
Pages : 386
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Book Description
This book covers both the fundamental and applied aspects of advanced Na-ion batteries (NIB) which have proven to be a potential challenger to Li-ion batteries. Both the chemistry and design of positive and negative electrode materials are examined. In NIB, the electrolyte is also a crucial part of the batteries and the recent research, showing a possible alternative to classical electrolytes – with the development of ionic liquid-based electrolytes – is also explored. Cycling performance in NIB is also strongly associated with the quality of the electrode-electrolyte interface, where electrolyte degradation takes place; thus, Na-ion Batteries details the recent achievements in furthering knowledge of this interface. Finally, as the ultimate goal is commercialization of this new electrical storage technology, the last chapters are dedicated to the industrial point of view, given by two startup companies, who developed two different NIB chemistries for complementary applications and markets.
Author: Arumugam Manthiram
Publisher: Springer Nature
ISBN: 3030908992
Category : Technology & Engineering
Languages : en
Pages : 408
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Book Description
This book presents the latest advances in rechargeable lithium-sulfur (Li-S) batteries and provides a guide for future developments in this field. Novel electrode compositions and architectures as well as innovative cell designs are needed to make Li-S technology practically viable. Nowadays, several challenges still persist, such as the shuttle of lithium polysulfides and the poor reversibility of lithium-metal anode, among others. However over the past several years significant progress has been made in the research and development of Li-S batteries. This book addresses most aspects of Li-S batteries and reviews the topic in depth. Advances are summarized and guidance for future development is provided. By elevating our understanding of Li-S batteries to a high level this may inspire new ideas for advancing this technology and making it commercially viable. This book is of interest to the battery community and will benefit graduate students and professionals working in this field
