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 29 for “"porous electrode"”.
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Electrosorption of Organic Compounds in a Flow-Through Porous Electrode
… high-surface-area adsorbent (flow-through porous electrode) is required, as well as a short cycle time.
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Lifetime prediction for lithium-ion batteries undergoing fast charging protocols
This thesis describes the application of Porous Electrode Theory and supervised machine learning to lifetime prediction for 18650 lithium iron phosphate (LiFePO₄ LFP)/graphite cells subject to mixed galvanostatic and potentiostatic fast charging policies. Porous Electrode Theory is used to predict …
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Learning the Electrochemistry of Degradation and Safety in Graphite Porous Electrodes for Lithium-ion Batteries
… at multiple scales - from single particle to porous electrode to the battery pack. Insights obtained from experimentation on a given scale to inform modeling, often performs poorly when it comes to prediction at other scales, limiting applicability. This thesis is a small part of a …
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Homogeneous Catalysis in Flow-by Porous Electrodes Containing Gas-Liquid Flow (Mass Transfer, Redox Catalyst, Oxygen Electrode)
Transport and reaction in a porous electrode containing gas-liquid flow and a dissolved catalyst were studied. Dimensionless criteria were developed for the selection and evaluation of candidate catalysts.
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Physics-based and data-driven modeling of multi-active material electrode batteries
As the design of single-component battery electrodes has matured, the battery industry has turned to hybrid electrodes with blends of two or more active materials to enhance battery performance. Leveraging best properties of each material, these multi-active material electrodes open a new and …
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Robust optimization techniques and design of Li-ion batteries
… varying porosities. The microstructure of a porous electrode was designed to minimize the Ohmic resistance. The spatial variation in the porosities was found to provide enhanced robustness of the Li-ion battery to uncertainties. This thesis also proposes a robust optimization formulation …
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Design of high-ionic conductivity electrodes for direct methanol fuel cells
Carbon-supported porous electrodes are used in low-temperature fuel cells to provide maximum catalyst surface area, while taking up little volume and using minimum catalyst material. In Direct Methanol Fuel Cells (DMFCs), however, much of the catalyst included in the anode is significantly …
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Data-driven Modeling of Lithium Intercalation Materials
… behavior and the population dynamics in a porous electrode. PDE-constrained optimization and Bayesian inference are used to infer and quantify the uncertainty of the constitutive laws from multiple data streams. Applications include learning the constitutive laws from images of pattern …
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The Application of Thin Film Ionic Self-assembled Multilayer (ISAM) Nanostructures in Electromechanical Bending Actuators and Micro-fabricated Gas Chromatography (uGC) Devices
… thin film nanostructures, including highly porous and conductive gold nanoparticles (GNP), and highly porous and thermally stable silica nanoparticles (SNP), were fabricated via the layer-by-layer (LbL) self-assembly technique. Their application in ionic polymer-metal composite (IPMC) …
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Nonequilibrium thermodynamics of porous electrodes for lithium-ion batteries
… its ability to capture both single particle and porous electrode experimental data. Second, we connect a model of electrochemical kinetics that is well-established in the chemistry community to nonequilibrium thermodynamics and apply it to materials with phase separating electrodes. We …
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ELECTRODEPOSITION OF POLYMER NETWORKS (EPON) AS CONFORMAL ULTRATHIN COATINGS
… between battery components such as the active electrode material and solid electrolyte could overcome some of these incompatibility detriments and the increase in contact resistance over long-term operation. However, existing coating strategies are incompatible with emerging mesoscaled 3D …
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Non-equilibrium thermodynamics in porous media : battery degradation, and sorption and transport in porous materials
Porous media offer many interesting problems in physics and engineering due to the interaction of phase transitions, surface effects and transport. In this thesis I examine two such problems: the degradation of lithium-ion batteries, and sorption and transport of fluids in porous materials. The …
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Simulating, Controlling, and Understanding Lithium-ion Battery Models
… high-performance implementation of the Porous Electrode Theory (PET) model. PET typically contains several hundred nonlinear differential-algebraic equations (DAEs) after discretization. This package is designed from a systems engineering perspective to be robust and highly efficient, …
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Computational modeling and design of multilayer corrosion coatings for galvanic protection of steel
… coatings by treating the coating material as a porous electrode with properties calculated through an effective medium approximation. The output of the corrosion models is validated through comparison to a number of quantitative and qualitative corrosion tests on a variety of coatings, and is …
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A Plastic-Based Thick-Film Li-Ion Microbattery for Autonomous Microsensors
… system for autonomous microsensors. A composite porous electrode structure and a liquid state electrolyte were implemented in the microbatteries to achieve the high power capability and energy density. The use of single-walled carbon nanotubes (SWNTs) was found to significantly reduce the …
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A combined modeling and experimental study assessing the impact of fluid pulsation and operating schemes on charge and energy efficiency in capacitive deionization
… CDI, we show that salt residue within electrodes introduces a temporal lag between charge and desalination stages of a CDI cycle. Without accounting for this effect in the collection of effluent, significant performance degradation occurs as current density increases. To overcome this …
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Dynamic modelling and simulation of the all-vanadium redox flow battery
… flow frame along with the pressure losses in the porous electrode and the pipes is calculated and incorporated into the model. With the knowledge of total pressure losses in the vanadium redox flow battery system, the overall system efficiencies under different constant or variable flow conditions …
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Improving energy and power densities of three-dimensional next generation secondary battery electrodes
3D mesostructured electrodes have been intensively investigated since the beginning of this century, based on the concept of shortening diffusion length of Li ions and electrons using either structured current collector or carbon-based additives, e.g. carbon nanotubes, reduced graphene oxides, etc. …
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Effect of Design Parameters and Intercalation Induced Stresses in Lithium Ion Batteries
… optimization of design parameters for porous electrodes that are commonly used in lithium ion systems. The approach simultaneously optimizes the battery design variables of electrode porosities and thickness for maximization of the energy drawn for an applied current, cut-off voltage, …
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Numerical investigation of ion transport mechanisms in electrochemical energy storage devices: Similarity correlation and exergy destruction analysis
… formulation with hydrodynamic dispersion in porous media for the species transport. The RFBs modeled here can use either cost-effective non-selective separators or crossover reducing ion-exchange membranes. We also introduce Marcus-Hush-Chidsey kinetic theory based on microscopic electron …
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