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 11 of 11 for “"capacity degradation"”.
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Diffusional lithium trapping as a failure mechanism of aluminum foil anodes in lithium-ion batteries
… for lithium-ion batteries due to their high capacity and low-cost, but their viability has been limited due to poor cyclability arising from pulverization and solid-electrolyte interphase growth. We show in this thesis that significant capacity degradation of aluminum foil anodes during …
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Refrigerant flow distribution in vertical headers of reversible microchannel heat exchangers
… is developed to evaluate heat exchanger capacity reduction because of refrigerant maldistribution. The capacity degradation is up to 30% for R410A and 5% for R134a in a two-pass MCHX, compared to the uniform distribution case. The capacity degradation is related to the coefficient of …
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Evaluation of the Cycle Profile Effect on the Degradation of Commercial Lithium Ion Batteries
… investigate the effect of cycle profile on the capacity fade of the battery. The pulse-heavy profile was designed to simulate on-road conditions for a typical hybrid electric vehicle, while the simplified square-wave profile was designed to have the same charge throughput as the pulse-heavy …
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Operando characterisation techniques for graphene-based lithium-sulfur batteries
… have the potential to enable high-gravimetric capacity, low-cost energy storage, but their widespread implementation is presently limited by their rapid capacity degradation due to irreversible loss of electrical connectivity with their active material. Electrically conductive cathodic host …
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Operando Optical Tracking of Ion Dynamics and Degradation in Battery Electrodes
… the kinetic origin of significant first-cycle capacity losses in Ni-rich cathodes. Finally, we study rod-like particles of Nb₁₄W₃O₄₄ (NWO) anodes during high-rate cycling. We resolve elongation of the particles which, by comparison with ensemble X-ray diffraction, allows us to determine changes …
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The Impacts of Particle Size Distribution and Electrode Structuring on NMC Cathode Performance
… but has also been suggested to accelerate their capacity degradation. This PhD work focuses on how particle size distribution and electrode structuring affect reaction heterogeneity and, subsequently, the battery performance, including cyclability and rate performance. To this end, …
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Experimentelle Untersuchungen zur Verformungsakkumulation und Tragfähigkeitsreduktion von zyklisch belasteten Pfählen
… and the actually occurring deformations or load capacity reductions have not yet been clarified. A significant point investigated in this work is therefore to assess the independence of the deformations and load carrying capacity changes due to cyclic loading of the order of appearance of …
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Flash gas bypass - a way to improve distribution of adiabatic two-phase refrigerant flow in headers of microchannel evaporators
… same compressor speed, FGB increased the cooling capacity and COP by up to 18% and 7%, respectively. For the case of matched cooling capacity with the baseline larger COP improvements were achieved in FGB system. Two main benefits of FGB approach were identified: 1) improved refrigerant …
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Corrosion Behavior of Corrosion-Resistant Steel Reinforcements in High and Ultra-High Performance Concrete in Chloride Attack Environments
… in an accelerated aging environment, and the degradation of the axial-load-carrying-capacity of the columns over time was also obtained and discussed. Findings indicate that corrosion-resistant reinforcements exhibit significantly improved corrosion performance. Additionally, HPC and UHPC …
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Utilizing A Real Life Data Warehouse To Develop Freeway Travel Time Eliability Stochastic Models
… the effect of travel demand variation and link capacity degradation on the reliability of a roadway network. The method is applied to a hypothetical roadway network and the results show that both travel time reliability and capacity reliability are consistent measures for reliability of the road …
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Alkaline Potassium Polyacrylate Electrolytes for Rechargeable Zinc-Manganese Dioxide Batteries
… 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 failure mechanisms of the Zn–MnO<sub>2</sub> battery …