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 75 for “"rechargeable batteries"”.
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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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Characterisation and prediction of state of health of rechargeable batteries
… management systems. It is logical to measure batteries at frequencies reflecting their daily or weekly charge-discharge cycles, i.e., of the order of microhertz. This is generally not done, however, because of difficulties that include extreme measurement durations and the need for care to …
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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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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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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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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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Phase transformations and microstructural design of lithiated metal anodes for lithium-ion rechargeable batteries
… in lithium storage at the anode of Li-ion rechargeable battery by alloying with metals such as Al, Sn, and Sb, or metalloids such as Si, as an alternative to the intercalation of graphite. This is due to the intrinsically high gravimetric and volumetric energy densities of this type of …
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Cr-Ga-N materials for negative electrodes in Li rechargeable batteries : structure, synthesis and electrochemical performance
… as possible future anode materials for lithium rechargeable batteries were studied. Motivation for this study was dealt in chapter 2 following chapter 1 that covered introduction to batteries, lithium ion batteries and anode materials for lithium ion batteries. Synthesis method with less time …
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Investigating the Thermal Stability and Cation Ordering in Layered Cathode LixMO2 (x ≤ 1; M = Co, Mn, Ni) Materials for Li-ion Rechargeable Batteries and Studying the Ferroelectric Properties of LiNbO3 Nanoparticles
… Mn, Ni), has served as cathode materials in the rechargeable battery, and LiNbO3, has wide application in ferroelectric devices such as electronics, non-volatile memories, and thin film capacitors. LiMO2 was synthesized and characterized to understand the correlation between capacity fading and …
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Synthesis and characterization of lithium-manganese-oxide electrodes for lithium battery applications
… more towards portable equipment the demand for batteries, especially rechargeable batteries, is increasing. Lithium batteries have several advantages over other competitive systems. Coupled with the inexpensive and environmentally friendly manganese dioxide, Li/MnO₂ batteries are being used …
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Silicon nanowire anode for lithium-ion batteries: fabrication, characterization and solid electrolyte interphase
… efficiencies and low emissions. Lithium-ion rechargeable batteries, compared to lead acid, nickel cadmium, nickel metal hydroxide, and other popular rechargeable batteries, are considered as the most promising candidates for EVs for their high operating voltage and high energy density. …
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Development of a MEMS turbocharger and gas turbine engine
… sources to power them increases. Primary (non-rechargeable) batteries now provide energy densities upwards of 180 W-hr/kg, secondary (rechargeable) batteries offer about 1/2 that level. Hydrocarbon fuels have a chemical energy density of 13,000-14,000 W-hr/kg. A power source using hydrocarbon …
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Understanding Failure Mechanisms using Multi-Scale Analyses to Improve the Performance of Zinc Metal and Lithium-ion Batteries
… distribution and electrified transportation. Rechargeable batteries are an attractive energy storage option because of their high energy efficiency, versatility, modularity, and ease of use. Lithium-ion batteries (LIBs) have dominated the rechargeable battery market for portable electronics …
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Magnetic augmented rotation system (MARS ) - properties and performance
… on MARS is implemented. This system includes rechargeable batteries in the range of 6 volts to 12 volts, a load in the form of a light bulb, a voltage transformer, and digital multimeter to monitor current/voltage in real-time. Additionally, infrared imaging is utilized during charging the …
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Nuclear Magnetic Resonance Studies of Electrode and Electrolyte Materials for Li-Ion Batteries
… electrode and electrolyte materials for advanced rechargeable lithium ion batteries. Three projects are described in this thesis. The first involves <sup>23</sup>Na and <sup>37</sup>Al static and magic angle spinning NMR studies of NaAlH<sub>4</sub>/C anode materials for advanced rechargeable …
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Design of an AUV recharging system
… storage capability. Research indicates that rechargeable batteries will continue to be the AUV power source of choice for at least the near future. Thus, a need exists in both military and commercial markets for a universal, industry-standard underwater AUV recharge system. A novel solution …
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Electrochemical and microstructural studies of AlPO₄-nanoparticle coated LiCoO₂ for lithium-ion batteries
… is studied as a positive electrode for lithium rechargeable batteries for a high-voltage charge limit of 4.7V. To understand the role of the coating in transport phenomena and in deintercalation of Li+, the electrochemical behavior is studied alongside the microstructure of the coating. The …
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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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