Download Free Polymer Ceramic Hybrid Separators For Lithium Ion Batteries Book in PDF and EPUB Free Download. You can read online Polymer Ceramic Hybrid Separators For Lithium Ion Batteries and write the review.

The demands for novel approaches that enhance safety and alleviate issue of aging in lithium-ion batteries are increasing and have promoted the development of new battery materials and fabrication techniques. In this study, polymer/ceramic fibers were created by combining the polyimide polymer and polysilsesquioxane (PSSQ) precursors in a one-step gas-assisted electrospinning process and used as separators in lithium-ion batteries. The resultant PI/PSSQ (90:10 wt%) hybrid fiber mats showed excellent thermal dimensional stability at elevated temperature and retained their structural integrity even after being ignited, lowering the risk of battery internal shorting. It was found that PI/PSSQ nanofibrous membranes exhibit higher porosity, superior electrolyte uptake and ionic conductivity in relation to the commercial microporous polyolefin separator (Celgard). As a result of the excellent electrochemical properties, PI/PSSQ separators outperformed Celgard separators by possessing better cyclic stability and rate performance. In addition, PI/PSSQ hybrid separators were elevated under high-voltage condition and also delivered obvious enhancement as compared to Celgard. Therefore, the PI/PSSQ hybrid separator can be regarded as a promising candidate for application in lithium-ion batteries.
Lithium-ion batteries are gaining popularity with increasing use of electronic devices especially laptops, cameras, and phones. With more and more electric vehicles hitting the market, next generation batteries with several advantages like, high energy density, long cycle life, low self-discharging are required. Separators act as an electrical insulator between battery's positive and negative electrode. They serve as an electrolyte reservoir and their structure plays an important role in battery's cycle life, safety, energy density and capacity.In this study, Polyimide (PI) / Polysilsesquioxane (PSSQ) hybrid separators were successfully fabricated via a single step electrospinning process. They are thermally stable, and non-flammable separators that enable high capacity and high-rate Li-ion batteries to be safer. The novelty of this project lies in its fundamental improvement of electrospun fibers. It involves controlling and tailoring morphology of nanoscale fiber made from a polymer and ceramic blend to reduce non-uniformity in the fiber morphology, leading to improved performance at high charging and discharging rates, as compared to Celgard, a commercially used separator. Fiber morphology was controlled by the addition of various surfactants. Sodium dodecyl sulfate (SDS) modified hybrid separators showed the best battery performance when paired with high-rate capable Silicon-graphene anodes. This combination of anode and separator performed better than the pristine hybrid separators and Celgard at high-rate cycling. These high-rate capable separators show huge potential to enable fast charging for electric vehicles
Polymer-Based Separators for Lithium-Ion Batteries: Production, Processing, and Properties takes a detailed, systematic approach to the development of polymer separators for lithium-ion batteries, supporting the reader in selecting materials and processes for high-performance polymer separators with enhanced properties. The book begins by introducing the polymeric materials that may be used for separators, as well as characterization techniques, before presenting the available technologies used to produce separators for use in lithium-ion batteries. Each technology is discussed in terms of the advantages and disadvantages of the chosen approach, with the properties of the separators made via each technology also summarized and compared in detail. In addition, areas for further development are addressed, and the limitations of current materials and separators in achieving those goals are highlighted. This is a valuable resource for scientists and engineers in the industry who work on polymer-based battery separators, polymers for electronic/energy applications, and new materials and processes for lithium-ion batteries. In academia, this book will be of interest to researchers and advanced students across the fields of polymer science, materials science, electronics, energy, and chemical engineering. Covers all current and new technologies used in the production of polymer battery separators for lithium-ion batteries Analyzes the connections between the various materials and processes, advantages and disadvantages, and resulting properties of different polymer-based separators Enables the reader to develop polymer separators that meet industry standards and property and performance requirements
The search for new electrode and membrane materials for lithium-ion batteries (LIBs) has been under investigation to satisfy the ever-growing demands for better performance with higher energy density, improved safety and longer cycle life. In this study, electrospraying has been used to produce mesoporous thin films for the application as Li-ion battery separators. Electrospraying is a film formation technique that utilizes electrical rather than mechanical forces to form uniformly sprayed films. Polyacrylonitrile (PAN) was used to produce these thin membranes of thickness ranging between 20 and 25 microns. In this system, Polyethylene Oxide was incorporated as a sacrificial polymer. An ideal separator for LIB must be permeable and must have pore sizes ranging from 30 to 100 nm to facilitate good ion transport. In addition, a low thickness is required for high energy and power densities. Using this approach, we were able to achieve thinner and more porous membranes with pore sizes ranging from 0.1 microns to 0.3 microns. Silica precursors like PSSQ(Poly(silsesquioxane)) and OPSZ (Organopolysilazane) were incorporated into the film to increase the ionic conductivity of the membranes and thermal stability thereby increasing the battery performance. Results from SEM, BET, DSC, FTIR, Impedance Spectroscopy, Capillary Flow Analysis, Dynamic Mechanical Analysis of resulting mesoporous polymer/ceramic will be discussed. The battery tests reveal that mesoporous polymeric/ceramic film separators exhibit higher capacity and better capacity retention than polymeric/ceramic nanofiber separators. Meanwhile, metal oxides can prevent the corrosion of the electrode under harsh electrochemical conditions and thus they are regarded as promising electrode coating materials for highperformance Lithium Ion Batteries (LIBs). Zirconium metal oxide was studied as a potential anode coating material to further improve the cycle stability and performance of the LIBs. The Zirconium metal oxide was electrosprayed onto the silicon (Si)/reduced graphene ocide (RGO) anodes. Si/RGO anodes have been prepared by gas-assisted electrospraying the mixture of Si and Graphene Oxide (GO), followed by thermal treatment. Results from SEM, Impedance Spectroscopy, battery testing will be discussed.
Lithium-sulfur (Li-S) is a promising candidate for next-generation batteries. There has been much effort in researching novel Li-S cathode materials to overcome inherent drawbacks, but limited attention to separator improvements, which can drastically affect ion diffusion and overall battery safety aspects. In this work, gas-assisted electrospinning is used to develop polymer/ceramic non-woven separators with polyimide (PI) and a polysilsesquioxane (PSSQ) ceramic. These separators are thermally stable well above temperatures seen in typical battery abuse conditions and retain their structural integrity even after being ignited. In Li-S cells, superior cycling performance is seen at high charge/discharge rates, owing to high ionic conductivity through the fibrous structure and favorable electrolyte interactions with PSSQ. To extend the previous work, a graphene interlayer was coated onto PI/PSSQ with an air-controlled electrospray method. This interlayer served as a physical barrier to hinder polysulfide shuttling and a "secondary cathode" to further improve battery rate capability performance.
The last two decades have seen an instrumental increase in the favor for renewable energy and the demand for electrical transport has significantly strengthened. With ever increasing demand for longer device duration especially for long-range electric transport, the existing Li-ion technology has eventually reached its limit. Meanwhile, Lithium Sulphur (Li-S) batteries, owing to their ultrahigh theoretical energy density of about 2600 Whkg-1, low-cost, Earth abundant and environmentally friendly sulfur (S) cathode, are seen as promising replacements to realize energy densities beyond 500 Whkg-1. However, Li-S batteries still suffer from several challenges. (1) The loss of coulombic efficiency due to 'polysulfide shuttling' wherein lithium polysulfide intermediates formed during cell discharge, dissolve into the battery electrolyte and migrate and undergo side reactions at the Li anode. The instability caused due to (2) significant cathodic volume changes, (2) lithium dendritic formation and (3) the formation of an ionically insulating 'rough' passivation layer after repeated charge/discharge operations, limit the practical utility of Li-S batteries. In this work, a novel solution in the form a facile, in-situ fabricated crosslinked Gel Electrolyte (GE) system has been proposed to tackle all the above issues. First, we present a comprehensive comparative analysis of the performance of GE cells with traditional liquid electrolyte (LE). The performance of GE cells was further enhanced using Polyethylene Glycol (PEG) as an additive. It was observed that the GE cells had substantially lower capacity fade and performed better than LE cells at high-rate cycling. Next, the GE system was paired with high-performance hybrid Polyimide (PI) / Organopolysilazane (OPSZ) separators. The synergistic performance of these two components in Li-S cell was probed and comparative analysis was conducted with conventional Celgard 2400 separator. The hybrid separator systems exhibit a ten-fold improvement in electrolyte uptake, a marked improvement in ionic conductivity and a high first cycle discharge capacity - close to that of LE cells.Finally, to investigate the effectivity of the gelled separators at trapping the lithium polysulfide (LPS) intermediates, a diffusivity analysis was carried out using gel crosslinked and non-crosslinked Celgard 2400 and PI/OPSZ separators. Experimental analysis showed that the gelled separators were more effective at entrapping LPS migration. We have also built a numerical model solved using Finite Element Method on a mapped mesh grid using COMSOL Multiphysics 5.5 to supplement the experimental analysis.
Advanced Materials for Battery Separators focuses solely on battery separators and their significance, providing the reader with a detailed description of their use in both aqueous and non-aqueous batteries. Topics include separator requirements and classifications, as well as discussions of the different methods for the fabrication of separators, experimental techniques used for the characterization of separators, and their physical and chemical properties. It concludes with a look at the challenges and new technologies developed to improve the performance of separators. This book is a valuable reference for engineers, research scholars, and for graduates and post graduates primarily in the field of material science, electrochemistry, and polymer chemistry. It can also be useful for engineers and technologists working in both industry and the energy field. Provides a detailed discussion of separators used in battery applications Discusses the influence of nanofillers on separator performance and the analytical techniques used for the characterization of separators Explores the challenges and new technologies to improve the performance of separators
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.
The last 10 years have seen an enormous growth in our understanding of the molecular organisation of biological membranes. Experimental methods have been devised to meas ure the translational and rotational mobility of lipids and proteins, thereby furnishing a quantitative basis for the concept of membrane fluidity. Likewise, the asymmetry of bi layer membranes as evidenced by the asymmetric insertion of proteins and lipids has been put on firm experimental ground. At higher molecular resolution it has been possible to provide a detailed pi2ture of the molecular conformation and dynamics of lipids and, to some extent, even of small peptides embedded in a bilayer matrix. Many of these achieve ments would not have been possible without the application of modem spectroscopic methods. Since these techniques are scattered in a variety of specialized textbooks the present monograph attempts to describe the key spectroscopic methods employed in present-day membrane research at an intermediate level. There is no question that the elusive detailed structure of the biological membrane demands a multiplicity of experi mental approaches and that no single spectroscopic method can cover the full range of physical phenomena encountered in a membrane. Much confusion in the literature has arisen by undue generalizations without considering the frequency range or other limi tations of the methods employed. It is to be hoped that the present monograph with its comprehensive description of most modem spectroscopic techniques, will contribute to- .