Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 154 for “"rechargeable"”.
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Fractional modelling of rechargeable batteries
… data at lower frequencies shows that any rechargeable battery can be simply modelled with a constant phase element in series with a resistor. Based on this observation, an equivalent circuit model and a mathematical model were proposed in this study. Similar to Randles’ model presented in …
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Composite cathodes for lithium rechargeable batteries
… electrode materials for solid-state rechargeable batteries. In situ growth of cathodic phases within ion-conducting copolymer domains was explored as a means to control morphology and to increase the surface-area-to-volume ratio, thereby increasing the specific electrode area for …
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Crystal structure prediction for rechargeable battery anodes
… the foundations of first-principles modelling of rechargeable batteries and the methods of crystal structure prediction are introduced. Results on phosphorous conversion anodes for sodium- and potassium-ion batteries are then presented and compared to the literature. In the sodium phosphide case …
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Modeling and Optimization of Rechargeable Sensor Networks
Over the past fifteen years, advances in Micro-Electro-Mechanical Systems (MEMS) technology have enabled rapid development of wireless sensor networks (WSNs). A WSN consists of a large number of sensor nodes that are typically powered by batteries. Each sensor node collects useful information from …
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Cation-disordered oxides for rechargeable lithium battery cathodes
… for high-energy density cathode materials for rechargeable lithium batteries are ever increasing. This is because such cathode materials will enable smaller and lighter rechargeable lithium batteries for complex applications such as in electric vehicles or in grid energy storage. Nearly all …
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Characterisation and prediction of state of health of rechargeable batteries
Electrochemical impedance spectroscopy (EIS) is used extensively in battery research, but usually at frequencies that do not reflect real-world usage patterns. This has resulted in equivalent circuit models (ECMs) that are over-complicated, and suboptimal battery management systems. It is logical …
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Studies of Sulfur-based Cathode Materials for Rechargeable Lithium Batteries
… capacity is critical for the next generation rechargeable batteries to meet the ever-increasing desires of global energy storage market. This thesis is focused on two sulfur-based cathode materials ranging from inorganic lithium sulfide to organotrisulfide. For lithium sulfide cathode, we …
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Alkaline Potassium Polyacrylate Electrolytes for Rechargeable Zinc-Manganese Dioxide Batteries
<p>Zinc (Zn)–manganese dioxide (MnO<sub>2</sub>) rechargeable batteries have high specific theoretical capacity as well as being environmentally friendly, intrinsically safe and low-cost. Liquid electrolytes, such as potassium hydroxide (KOH), are historically used in these batteries; however, many …
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Toward commercializable microphase-separating copolymer electrolytes for rechargeable lithium batteries
Microphase-separating copolymers have been shown to possess the electrical properties of a polymer liquid and the mechanical properties of a solid. In the past, these materials had to be produced via anionic methods that are not easily scalable. To circumvent this problem, two approaches were …
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Understanding and Improving Zinc Anodes for High-Energy Rechargeable Alkaline Batteries
… organic electrolytes. Metallic zinc as a rechargeable anode material for aqueous batteries has gained tremendous attention with merits of intrinsic safety, low cost, and high theoretical volumetric capacity (5,854 mAh cm-3). Among zinc-based batteries, Zn-air batteries are promising with …
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In situ investigation of electrochemical surface stress development in rechargeable batteries
Rechargeable batteries are everywhere these days such as portable electric devices and electric vehicles. The global annual sales of electric vehicles are increasing, showing the rechargeable battery market is obviously getting bigger. Li-ion batteries are operated by an intercalation mechanism. …
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Stability of lithium aluminum manganese oxide cathodes for rechargeable lithium batteries
… nontoxic intercalation cathode materials for rechargeable lithium batteries. In this work, the stability of these compounds during synthesis and in use has been studied in several respects. (1) Phase stability of LiMnO2 polymorphs has been determined under the high temperature synthesis …
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Towards more stable and ion-conductive organic electrolytes for rechargeable batteries
… increase the utilization of renewable energy. Rechargeable batteries are important enablers of sustainable energy use, as they can be employed to store energy generated from renewable but intermittent source. Enhancing the functionality of battery electrolytes, such as (electro)chemical …
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Tailoring Electrolytes for Extreme Temperatures in Rechargeable Aluminum and Lithium-Ion Batteries
… under extreme conditions.</p> <p>In parallel, rechargeable aluminum batteries are gaining attention as potential alternatives to LIBs due to aluminum's high theoretical capacity, abundance, safety, and low cost. Yet, the development of practical Al batteries has been limited by the lack of …
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Synthesis and characterization of novel fluoride and oxide cathodes for rechargeable batteries
… is key to improving the energy density of rechargeable batteries and enabling new applications of energy storage. In this thesis, two families of materials were explored as candidate cathode materials: the dirutile and rutile polymorphs of LiMnF4, and layered lithium-excess . . . Dirutile …
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Molecular to Macroscopic Understanding of Chloroaluminate Anion Intercalation in Rechargeable Aluminum-Graphite Batteries
… positive electrode material in non-aqueous rechargeable aluminum batteries, which store charge when monovalent chloroaluminate molecular anions (<em>e.g.,</em> AlCl<sub>4</sub><sup>-</sup>) intercalate into graphite. Such aluminum-graphite batteries exhibit discharge voltages of <em>ca.</em> …
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Understanding and Controlling Failure Mechanisms of the Zinc Anode for Rechargeable Alkaline Batteries
… by safe, low-cost, and reliable large-scale rechargeable battery energy storage systems. Zinc (Zn) alkaline electrodes hold great importance and promise in the battery technology community as they satisfy the safety and cost requirements, yet their behavior in real world application is still …
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Advanced Materials for High-Energy Rechargeable Batteries: Borate Polyanion Cathodes and Silicon Anodes
… to enhance the energy density of next-generation rechargeable batteries, with a dual focus on cathode materials for rechargeable magnesium-ion batteries (RMBs) and anode materials for lithium-ion batteries (LIBs). The work is divided into two major parts: the development and evaluation of …
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