Phase Field Modeling Of Phase Changes And Mechanical Stresses In Electrode Particles Of Secondary Batteries
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| Author | : Zhang, Tao |
| Publisher | : KIT Scientific Publishing |
| Total Pages | : 224 |
| Release | : 2021-09-27 |
| Genre | : Technology & Engineering |
| ISBN | : 3731510022 |
Most storage materials exhibit phase changes, which cause stresses and, thus, lead to damage of the electrode particles. In this work, a phase-field model for the cathode material NaxFePO4 of Na-ion batteries is studied to understand phase changes and stress evolution. Furthermore, we study the particle size and SOC dependent miscibility gap of the nanoscale insertion materials. Finally, we introduce the nonlocal species concentration theory, and show how the nonlocality influences the results.
| Author | : Tao Zhang |
| Publisher | : |
| Total Pages | : |
| Release | : 2019 |
| Genre | : |
| ISBN | : |
| Author | : Röhe, Maximilian |
| Publisher | : KIT Scientific Publishing |
| Total Pages | : 178 |
| Release | : 2024-01-09 |
| Genre | : |
| ISBN | : 3731512343 |
In this work, the first simulation model of oxygen depolarized cathodes (ODC), which are silver catalyst-based gas diffusion electrodes, is presented that considers the phase equilibrium of the gas-liquid interface and structure-related inhomogeneities in electrolyte distribution. By means of the model it has been identified that mass transport of water and ions in the liquid phase is a crucial factor for electrode performance and how it is influenced by the electrode structure.
| Author | : Ganser, Markus |
| Publisher | : KIT Scientific Publishing |
| Total Pages | : 272 |
| Release | : 2021-03-09 |
| Genre | : Technology & Engineering |
| ISBN | : 3731510472 |
Solid state batteries with a lithium metal electrode are considered the next generation of high energy battery technology. Unfortunately, lithium metal is prone to harmful protrusion or dendrite growth which causes dangerous cell failure. Within this work the problem of protrusion growth is tackled by deriving a novel electro-chemo-mechanical theory tailored for binary solid state batteries which is then used to discuss the impact of mechanics on interface stability by numerical studies.
| Author | : Birkholz, Oleg |
| Publisher | : KIT Scientific Publishing |
| Total Pages | : 246 |
| Release | : 2022-10-05 |
| Genre | : Science |
| ISBN | : 373151172X |
Hierarchically structured active materials in electrodes of lithium-ion cells are promising candidates for increasing gravimetric energy density and improving rate capability of the system. To investigate the influence of cathode structures on the performance of the whole cell, efficient tools for calculating effective transport properties of granular systems are developed and their influence on the electrochemical performance is investigated in specially adapted cell models.
| Author | : Schöller, Lukas |
| Publisher | : KIT Scientific Publishing |
| Total Pages | : 230 |
| Release | : 2024-03-15 |
| Genre | : |
| ISBN | : 3731513404 |
During the production of fiber-reinforced thermosets, the resin material undergoes a reaction that can lead to damage. A two-stage polymerization reaction is modeled using molecular dynamics and evaluations of the system including a fiber surface are performed. In addition, a phase-field model for crack propagation in heterogeneous systems is derived. This model is able to predict crack growth where established models fail. Finally, the model is used to predict crack formation during curing.
| Author | : Lingelbach, Yannick |
| Publisher | : KIT Scientific Publishing |
| Total Pages | : 278 |
| Release | : 2024-07-24 |
| Genre | : |
| ISBN | : 3731513528 |
This work presents a data mining framework applied to industrial heattreatment (bainitization and case hardening) aiming to optimize processes and reduce costs. The framework analyses factors such as material, production line, and quality assessment for preprocessing, feature extraction, and drift corrections. Machine learning is employed to devise robust prediction strategies for hardness. Its implementation in an industry pilot demonstrates the economic benefits of the framework. - This work presents a data mining framework applied to industrial heattreatment (bainitization and case hardening) aiming to optimize processes and reduce costs. The framework analyses factors such as material, production line, and quality assessment for preprocessing, feature extraction, and drift corrections. Machine learning is employed to devise robust prediction strategies for hardness. Its implementation in an industry pilot demonstrates the economic benefits of the framework.
| Author | : Fett, Theo |
| Publisher | : KIT Scientific Publishing |
| Total Pages | : 226 |
| Release | : 2022-07-11 |
| Genre | : Science |
| ISBN | : 3731511592 |
Water diffusing into silica surfaces gives rise for several effects on diffusion behaviour and mechanical properties. In a preceding booklet, we focused on diffusion and fiber strengths and deformations which were obtained by water soaking under external loading. In the present booklet we deal with results and interpretations of strength increase in the absence of applied stresses.
| Author | : Fett, Theo |
| Publisher | : KIT Scientific Publishing |
| Total Pages | : 226 |
| Release | : 2022-07-11 |
| Genre | : Science |
| ISBN | : 3731511487 |
Water diffusing into silica surfaces gives rise for several effectson diffusion behaviour and mechanical properties. Water added to silica glass increases its specific volume so that the silica expands near the surface. Mechanical boundary conditions give rise for compressive “swelling stresses”. This fact provides a tool for the interpretation of many experimental observations from literature.
| Author | : Mazzocchi, Francesco |
| Publisher | : KIT Scientific Publishing |
| Total Pages | : 212 |
| Release | : 2022-07-01 |
| Genre | : Technology & Engineering |
| ISBN | : 3731511819 |
This work aimed at designing, studying and producing the first prototypes of KIDs tailored for fusion plasma polarimetric diagnostics. Diamond was considered for the first time as substrate material for low-temperature superconducting detectors given its unmatched optical, radiation hardness and thermal qualities, properties necessary for working environments potentially saturated with radiation. This work represents a first step toward the optimization and final application of this technology.
