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The ability to store energy in a scalable, profitable, and environmentally benign manner is a key challenge in the global transition to clean energy. Unfortunately, lithium-ion batteries (LIBs) and other conventional energy storage systems depend on metal-based electrode materials and the large-scale mining of metal ores, which is environmentally costly and ultimately unsustainable. Organic electrode materials (OEMs) offer an intriguing alternative to metal-based electrode materials, as OEMs benefit from abundant feedstocks, unparalleled synthetic modularity, and rich redox chemistry. However, reported OEMs lack the fast charging rates and long cycle lifetimes of metal-based electrode materials, likely due to low electrical conductivity and dissolution in battery electrolytes. To address these issues, we have focused on understanding fundamental relationships between the molecular structure of OEMs and battery performance, which can serve as design guidelines for the development of next-generation sustainable energy storage systems. Using benzoquinone as our OEM scaffold, we first investigated the impact of discrete synthetic modifications, such as incorporating thiazyl (-S=N-) moieties or hydrogen bonding motifs, to uncover new structure-performance trends for OEMs in LIBs. Through theoretical calculations and experimental studies, we established a positive correlation between non-covalent intermolecular interaction strength and performance for thiazyl and hydrogen bonding functional groups. In particular, we found that increasing the number of thiazyl S atoms or hydrogen bonding groups leads to stronger intermolecular interactions, resulting in enhanced charging rates and prolonged battery lifetimes. These works showcase molecular modification as a tool for systematically tuning battery performance, presenting two possible design strategies for improving conductivity and stability in future OEMs. Aside from LIBs, aqueous Zn-ion batteries (AZIBs) have become promising candidates for grid-scale renewable energy storage due to the low cost of Zn metal and safety of aqueous electrolytes. Toward this end, we designed and synthesized two low-cost Zn-thiolate OEMs, utilizing our molecular modification approach to tune the electrochemical performance. Through detailed mechanistic investigation and optimization of the electrolyte and separator, we were able to identify and inhibit a detrimental H+ insertion redox process, extending the battery lifetime appreciably. This work identifies a new thiolate/disulfide redox platform for designing low-cost electrode materials for sustainable energy storage. In each of these studies, chemical intuition and experimental testing were necessary to identify, synthesize, and evaluate each OEM candidate. Although this approach has led to useful insights and design trends in our case, it is inherently time-intensive, and a good outcome is not guaranteed. With this in mind, we have begun developing a statistical model for predicting OEM performance based on easily obtained physical organic features. We aim to use this model to identify key factors that govern the performance of OEMs, which will significantly reduce the time and cost of OEM development.
Viable electrical energy storage is essential for the development of sustainable energy technologies, such as renewable power and electric vehicles. Electrochemical energy storage devices are promising candidates for these applications, and lithium-ion batteries are the leading available technology. However, the current cost and performance of these devices limit their widespread adoption. In this thesis, we develop materials and design guidelines for positive electrodes and solid-state electrolytes to address these challenges. The positive electrode is one of the main limitations to improving both the capacity and cost of lithium-ion batteries. Organic molecules represent a class of materials, which if selected correctly, can address these issues. The electrochemical properties of various polycyclic aromatic hydrocarbons (PAHs), which are organic molecules produced in significant quantities as industrial waste products, were investigated for use as positive electrodes. By introducing PAHs within a functionalized few-walled carbon nanotube (FWNT) matrix, we developed high-energy and high-power positive electrodes. The redox potential and capacity of various PAHs were correlated with their chemical and electronic structures, and their interaction with the functionalized FWNT matrix. Another challenge limiting the adoption of lithium-ion batteries is the flammability and instability of the organic liquid electrolyte, which increases the risk of dangerous battery failures and limits the use of higher energy-density electrodes. One promising solution is to replace the organic liquid electrolyte with a solid-state lithium-ion conductor. However, the ionic conductivity of solid-state electrolytes are typically several orders of magnitude lower than organic liquid electrolytes. Using lattice dynamics, we developed a framework to understand the migration of lithium through crystalline solid-state electrolytes. The understanding of the use of organic materials in positive electrodes and solid-state lithium-ion conductors as electrolytes provides insight for the design of next-generation electrochemical energy storage solutions.
This book provides a comprehensive overview of the latest developments and materials used in electrochemical energy storage and conversion devices, including lithium-ion batteries, sodium-ion batteries, zinc-ion batteries, supercapacitors and conversion materials for solar and fuel cells. Chapters introduce the technologies behind each material, in addition to the fundamental principles of the devices, and their wider impact and contribution to the field. This book will be an ideal reference for researchers and individuals working in industries based on energy storage and conversion technologies across physics, chemistry and engineering. FEATURES Edited by established authorities, with chapter contributions from subject-area specialists Provides a comprehensive review of the field Up to date with the latest developments and research Editors Dr. Mesfin A. Kebede obtained his PhD in Metallurgical Engineering from Inha University, South Korea. He is now a principal research scientist at Energy Centre of Council for Scientific and Industrial Research (CSIR), South Africa. He was previously an assistant professor in the Department of Applied Physics and Materials Science at Hawassa University, Ethiopia. His extensive research experience covers the use of electrode materials for energy storage and energy conversion. Prof. Fabian I. Ezema is a professor at the University of Nigeria, Nsukka. He obtained his PhD in Physics and Astronomy from University of Nigeria, Nsukka. His research focuses on several areas of materials science with an emphasis on energy applications, specifically electrode materials for energy conversion and storage.
The idea of a NATO Science Committee Institute on "Materials for Advanced Batteries" was suggested to JB and DWM by Dr. A. G. Chynoweth. His idea was to bring together experts in the field over the entire spectrum of pure research to applied research in order to familiarize everyone with potentially interesting new systems and the problems involved in their development. Dr. M. C. B. Hotz and Professor M. N. Ozdas were instrumental in helping organize this meeting as a NATO Advanced Science Institute. An organlzlng committee consisting of the three of us along with W. A. Adams, U. v Alpen, J. Casey and J. Rouxel organized the program. The program consisted of plenary talks and poster papers which are included in this volume. Nearly half the time of the conference was spent in study groups. The aim of these groups was to assess the status of several key aspects of batteries and prospects for research opportunities in each. The study groups and their chairmen were: Current status and new systems J. Broadhead High temperature systems W. A. Adams Interface problems B. C. H. Steele Electrolytes U. v Alpen Electrode materials J. Rouxel These discussions are summarized in this volume. We and all the conference participants are most grateful to Professor J. Rouxel for suggesting the Aussois conference site, and to both he and Dr. M. Armand for handling local arrangements.
Advanced Two-Dimensional Material-Based Heterostructures in Sustainable Energy Storage Devices provides a detailed overview of advances and challenges in the development of 2D materials for use in energy storage devices. It offers deep insight into the synthesis, characterization, and application of different 2D materials and their heterostructures in a variety of energy storage devices, focusing on new phenomena and enhanced electrochemistry. This book: Introduces 2D materials, synthesis methods, and characterization techniques Discusses application in a wide range of batteries and supercapacitors Offers perspectives on future investigations necessary to overcome existing challenges This comprehensive reference is written to guide researchers and engineers working to advance the technology of energy-efficient energy storage devices.
This book surveys state-of-the-art research on and developments in lithium-ion batteries for hybrid and electric vehicles. It summarizes their features in terms of performance, cost, service life, management, charging facilities, and safety. Vehicle electrification is now commonly accepted as a means of reducing fossil-fuels consumption and air pollution. At present, every electric vehicle on the road is powered by a lithium-ion battery. Currently, batteries based on lithium-ion technology are ranked first in terms of performance, reliability and safety. Though other systems, e.g., metal-air, lithium-sulphur, solid state, and aluminium-ion, are now being investigated, the lithium-ion system is likely to dominate for at least the next decade – which is why several manufacturers, e.g., Toyota, Nissan and Tesla, are chiefly focusing on this technology. Providing comprehensive information on lithium-ion batteries, the book includes contributions by the world’s leading experts on Li-ion batteries and vehicles.
Materials for Energy Storage offers a combinatorial understanding of materials science and electrochemistry in electrochemical energy storage devices with a holistic overview of the status, research gaps, and future opportunities. Rooted in a profound understanding of contemporary energy utilization, aligned with the sustainable development goals, this book delves deep into the several device chemistries, impact of nanomaterials, and critical factors related to the device performance. It discusses electrode-electrolyte interaction, device fabrication, and commercial aspects. This book will offer value to the graduate and postgraduate students, researchers, and industry professionals related to materials science and energy technology.
With its inclusion of the fundamentals, systems and applications, this reference provides readers with the basics of micro energy conversion along with expert knowledge on system electronics and real-life microdevices. The authors address different aspects of energy harvesting at the micro scale with a focus on miniaturized and microfabricated devices. Along the way they provide an overview of the field by compiling knowledge on the design, materials development, device realization and aspects of system integration, covering emerging technologies, as well as applications in power management, energy storage, medicine and low-power system electronics. In addition, they survey the energy harvesting principles based on chemical, thermal, mechanical, as well as hybrid and nanotechnology approaches. In unparalleled detail this volume presents the complete picture -- and a peek into the future -- of micro-powered microsystems.
Metal-Organic Framework-Based Nanomaterials for Energy Conversion and Storage addresses current challenges and covers design and fabrication approaches for nanomaterials based on metal organic frameworks for energy generation and storage technologies. The effect of synthetic diversity, functionalization, ways of improving conductivity and electronic transportation, tuning-in porosity to accommodate various types of electrolyte, and the criteria to achieve the appropriate pore size, shape and surface group of different metal sites and ligands are explored. The effect of integration of other elements, such as second metals or hetero-atomic doping in the system, to improve catalytic activity and durability, are also covered. This is an important reference source for materials scientists, engineers and energy scientists looking to further their understanding on how metal organic framework-based nanomaterials are being used to create more efficient energy conversion and storage systems. Describes major metal organic framework-based nanomaterials applications for fuel cell, battery, supercapacitor and photovoltaic applications Provides information on the various nanomaterial types used for creating the most efficient energy conversion and storage systems Assesses the major challenges of using nanotechnology to manufacture energy conversion and storage systems on an industrial scale