Thematische Bibliographien / SEI stability

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Auswahl der wissenschaftlichen Literatur zum Thema „SEI stability“

Autor: Grafiati

Veröffentlicht am 25. Mai 2024

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Zeitschriftenartikel zum Thema "SEI stability"

Westhead, Olivia, Matthew Spry, Zonghao Shen, Alexander Bagger, Hossein Yadegari, Silvia Favero, Romain Tort et al. „Solvation and Stability in Lithium-Mediated Nitrogen Reduction“. ECS Meeting Abstracts MA2022-02, Nr. 49 (09.10.2022): 1929. http://dx.doi.org/10.1149/ma2022-02491929mtgabs.

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The lithium-mediated method of electrochemical nitrogen reduction, pioneered by Tsuneto et al1 then verified by Andersen et al2, is currently the sole paradigm capable of unequivocal electrochemical ammonia synthesis. Such a system could allow the production of green, distributed ammonia for use as fertiliser or a carbon-free fuel. However, despite great improvements in Faradaic efficiency and stability since just 20193, fundamental understanding of the mechanisms governing nitrogen reduction and other parasitic reactions is lacking. Lithium Ion Battery (LIB) research can provide insight; since both lithium-mediated electrochemical ammonia synthesis and LIBs utilise an organic solvent and lithium salt, both form a Solid Electrolyte Interphase (SEI), which is electronically insulating but ionically conducting, at the electrode surface. In LIBs, this is necessary to stabilize and cycle low potential materials4. In lithium-mediated ammonia synthesis, the SEI could also have a critical role in controlling the access of protons and other key reactants to the catalytically active sites and promoting greater selectivity toward nitrogen reduction to ammonia5. While some characterisation of the SEI has been carried out for the lithium-mediated nitrogen reduction system6, the literature still lacks holistic studies which aim to carefully characterise the bulk electrolyte and SEI components and link them to system performance. In this work we use insight from battery science to tackle a significant stability problem in lithium-mediated nitrogen reduction. The traditional electrolyte employed by Tsuneto et al. was 0.2 M LiClO4 in a 99:1 tetrahydrofuran to ethanol mix. While this system can produce ammonia, the working electrode potential becomes more negative over time. Our initial investigations show that this problem stems from an unstable SEI which becomes increasingly organic. Simply by raising the concentration of LiClO4 in the electrolyte, we vastly improve stability, as shown in figure 1(a), and boost Faradaic efficiency. Bulk electrolyte salt solvation properties are investigated through Raman spectroscopy, as shown in figure 1(b). Here we observe the emergence of a shoulder at around 930 cm-1 with increasing LiClO4 concentration, which we assign to the emergence of Contact-Ion-Pairs (CIPs) through comparison to Density Functional Theory calculations. These CIPs mean that perchlorate anion degradation products are more abundant in the formed SEI, as shown in our X-Ray Photoelectron Spectroscopy and Time-of-Flight Secondary Ion Mass spectrometry results. This more inorganic SEI protects the electrolyte against further degradation, preventing the working electrode drift to more negative potentials. We then link this behaviour to a peak observed in the Faradaic efficiency of ammonia synthesis at 0.6 M LiClO4 by also considering decreasing N2 solubility and diffusivity, as well as a more ionically conductive SEI, in an increasingly concentrated electrolyte. We also present never-before seen cross-sectional images of the SEI using cryogenic Focussed Ion Beam milling and Scanning Electron Microscopy, further aiding understanding of how salt solvation affects the morphology of the formed SEI and system performance. Our results emphasise the need to consider SEI properties in electrolyte design for lithium-mediated nitrogen reduction, as well as the need to balance desirable SEI properties with desirable bulk electrolyte properties. Tsuneto, A., Kudo, A. & Sakata, T. Efficient Electrochemical Reduction of N 2 to NH 3 Catalyzed by Lithium . Chemistry Letters vol. 22 851–854 (1993). Andersen, S. Z. et al. A rigorous electrochemical ammonia synthesis protocol with quantitative isotope measurements. Nature 570, 504–508 (2019). Westhead, O., Jervis, R. & Stephens, I. E. L. Is lithium the key for nitrogen electroreduction? Science. 372, 1149–1150 (2021). Peled, E. & Menkin, S. Review—SEI: Past, Present and Future. J. Electrochem. Soc. 164, A1703–A1719 (2017). Singh, A. R. et al. Electrochemical Ammonia Synthesis—The Selectivity Challenge. ACS Catal. 7, 706–709 (2017). Li, K. et al. Enhancement of lithium-mediated ammonia synthesis by addition of oxygen. Science. 1597, 1593–1597 (2021). Figure 1

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Guihua, Li, und Jin Zhen. „Global stability of an SEI epidemic model“. Chaos, Solitons & Fractals 21, Nr. 4 (August 2004): 925–31. http://dx.doi.org/10.1016/j.chaos.2003.12.031.

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Mesmin, C., und J. ‐O Liljenzin. „Determination of H2TPTZ22+Stability Constant by TPTZ Solubility in Nitric Acid“. Solvent Extraction and Ion Exchange 21, Nr. 6 (11.01.2003): 783–95. http://dx.doi.org/10.1081/sei-120025922.

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Wang, Menghao. „In Situ Formation of Dense Polymers as Artificial Protective Layers for Lithium Metal Anodes“. Journal of Physics: Conference Series 2578, Nr. 1 (01.08.2023): 012034. http://dx.doi.org/10.1088/1742-6596/2578/1/012034.

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Abstract In order to improve the stability and safety of lithium (Li) metal anodes, an innovative artificial solid electrolyte interface (SEI) film of Li Poly (tert-butyl acrylate-co-ethyl acrylate-co-methacrylic acid) (LiPTBEM) has been designed. This thin and uniformly artificial SEI is stable, which can suppress the continuous side reactions between the electrolyte and Li metal, improve the stability of modified Li metal anodes, and achieve better electrochemical performance. Symmetric batteries with LiPTBEM exhibit significantly improved cycling stability, indicating that LiPTBEM is a promising artificial SEI film.

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Lucht, Brett L. „(Invited) Optimization of Carbonate Electrolytes for Lithium Metal Anodes“. ECS Meeting Abstracts MA2023-02, Nr. 5 (22.12.2023): 830. http://dx.doi.org/10.1149/ma2023-025830mtgabs.

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A solid electrolyte interphase (SEI) is generated on the anode of lithium ion batteries during the first few charging cycles. While the SEI generated for LiPF6/carbonate based electrolytes is stable on graphite anodes, the stability of the SEI is poor for LiPF6/carbonate based electrolytes with lithium metal anodes. However, modification of the carbonate based electrolytes via incorporation of alternative salts and/or electrolyte additives significantly improves the stability of the SEI and the cycle life of lithium metal anodes. Investigations of the SEI structure have been conducted via a combination of XPS, IR-ATR, SEM, and TEM. Mechanisms for the generation of the complicated mixture of products are presented along with the differences in the SEI structure and function.

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Ali, Yasir, Noman Iqbal, Imran Shah und Seungjun Lee. „Mechanical Stability of the Heterogenous Bilayer Solid Electrolyte Interphase in the Electrodes of Lithium–Ion Batteries“. Mathematics 11, Nr. 3 (19.01.2023): 543. http://dx.doi.org/10.3390/math11030543.

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Mechanical stability of the solid electrolyte interphase (SEI) is crucial to mitigate the capacity fade of lithium–ion batteries because the rupture of the SEI layer results in further consumption of lithium ions in newly generated SEI layers. The SEI is known as a heterogeneous bilayer and consists of an inner inorganic layer connecting the particle and an outer organic layer facing the electrolyte. The growth of the bilayer SEI over cycles alters the stress generation and failure possibility of both the organic and inorganic layers. To investigate the probability of mechanical failure of the bilayer SEI, we developed the electrochemical-mechanical coupled model with the core–double-shell particle/SEI layer model. The growth of the bilayer SEI is considered over cycles. Our results show that during charging, the stress of the particle changes from tensile to compressive as the thickness of bilayer SEI increases. On the other hand, in the SEI layers, large compressive radial and tensile tangential stress are generated. During discharging, the compressive radial stress of the bilayer SEI transforms into tensile radial stress. The tensile tangential and radial stresses are responsible for the fracture and debonding of the bilayer SEI, respectively. As the thickness ratio of the inorganic to organic layers increases, the fracture probability of the inorganic layer increases, while that of the organic layer decreases. However, the debonding probability of both layers is decreased. In addition, the SEI covering large particles is more vulnerable to fracture, while that covering small particles is more susceptible to debonding. Therefore, tailoring the thickness ratio of the inorganic to organic layers and particle size is important to reduce the fracture and debonding of the heterogeneous bilayer SEI.

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Yao, Koffi, Rownak Jahan Mou, Sattajit Barua und Daniel P. Abraham. „(Digital Presentation) Unraveling of the Morphology and Chemistry Dynamics in the FEC-Generated Silicon Anode SEI across Delithiated and Lithiated States“. ECS Meeting Abstracts MA2023-02, Nr. 8 (22.12.2023): 3289. http://dx.doi.org/10.1149/ma2023-0283289mtgabs.

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The silicon solid electrolyte interphase (SEI) faces cyclical cracking and reconstruction due to the ~350% volume expansion of Si which leads to shortened cell life during electrochemical cycling. Understanding the SEI morphology/chemistry and more importantly its dynamic evolution from delithiated and lithiated states is paramount to engineering a stable Si anode. Fluoroethylene carbonate (FEC) is a preferred additive with widely demonstrated enhancement of the Si cycling. Thus, insights into the effects of FEC on the dynamics of the resulting SEI may provide hints toward engineering the Si interface. Herein, ATR-FTIR, AFM, tip IR, and XPS probing all show pronounced relative invariance of the FEC-generated SEI compared to the FEC-free SEI between adjacent lithiated and delithiated states beyond the formation cycles. The SEI of Si thin film model surfaces in the baseline 1 M LiPF6 in EC:EMC (1:1) undergoes major morphological and chemical speciation swings between half-cycles while comparatively the SEI upon addition of FEC displays far less dynamic evolution. This morphology and chemistry stability of the FEC-SEI supports the enhanced cycling stability of silicon anodes in FEC-containing electrolytes. The experimental evidence gathered suggests that the FEC-SEI invariance is enabled by an elastomeric polycarbonate matrix that preserves the SEI integrity against the expansion of silicon upon lithiation. In turn, less electrolyte-consuming reconstruction occurs which manifests as and high LiF content from one half-cycle to the next. This work provides critical insights to enhance the silicon anode stability via targeted SEI engineering, namely that LiF protected by an elastomeric protective matrix may be key to buffering the unavoidable mechanical disruption. Figure 1

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Alexandratos, Spiro D., und Stephanie D. Smith. „High Stability Solvent Impregnated Resins: Metal Ion Complexation as a Function of Time“. Solvent Extraction and Ion Exchange 22, Nr. 4 (31.12.2004): 713–20. http://dx.doi.org/10.1081/sei-120038701.

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Xue, Yakui, Xinpeng Yuan und Maoxing Liu. „Global stability of a multi-group SEI model“. Applied Mathematics and Computation 226 (Januar 2014): 51–60. http://dx.doi.org/10.1016/j.amc.2013.09.050.

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Ji, Yuchen, Luyi Yang und Feng Pan. „In-Situ Probing the Origin of Interfacial Instability of Na Metal Anode“. ECS Meeting Abstracts MA2023-02, Nr. 5 (22.12.2023): 832. http://dx.doi.org/10.1149/ma2023-025832mtgabs.

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The chemical-mechanical stability of solid–electrolyte interphase (SEI) is probably the most critical factor determining the performance of alkali metal anode (Li, Na, etc.) in secondary batteries. Although extensive advanced characterization methods have been carried out to study SEI layers of Na metal anode, including solid state nuclear magnetic resonance1, 2, cryogenic transmission electron microscopy3, etc., the structural/componential evolution of SEI is still an uncharted territory due to its transient formation process and complicated components. In this work, we systematically analyze the SEI formation and dissolution processes via jointly combining multiple in-situ characterization technologies. By revealing spatial-temporal resolved information of SEI evolution, the buried origin of chemical-mechanical instability of SEI in Na anode is further clarified, which provides valuable guidelines for SEI engineering. A dynamic SEI formation/dissolution model of Na metal anode is demonstrated as follow: Quantitative evaluation methods for the chemical instability (i.e., solubility) and mechanical instability (i.e., modulus) are designed. According to the mass variation in EQCM and the modulus measurement in in-situ AFM, we firstly quantitatively observe the chemical and mechanical stability evolution during SEI formation process. The dynamic evolution picture of SEI formation has been explicitly established. We discover the instantaneous electrochemical formation process of SEI is obviously divided into two stages based on the potential. It is revealed that the formation of efficient passivation layer anchored on Na surface during the 1st (passivating) stage (2.3 – 1 V vs Na/Na+) (Scheme 1 a-b) is the critical factor to construct stable SEI. In absence of passivation layer, the Na mental surface will trigger unrestricted electrolyte decomposition and homogenous components distribution during the subsequent (growing) stage. The dissolution model of SEI was revealed related to its spatial distribution of organics and inorganics. SEI with layered structure evolved from a compact passivation layer is found to have higher stability than that with homogenously distributed components. The inorganic species in the latter structure tend to detach from the SEI with the dissolution of organics, resulting in poor SEI chemical stability (Scheme 1 c and e). By contrast, SEIs with hierarchical structure growing based on the top of a passivation layer exhibits lower dissolution tendency (Scheme 1 d and f). The dynamic analysis of SEI evolution of Na anode presented in this work not only sheds light on how to construct a stable SEI, but also provides guiding significance in unveiling the seemingly complicated interfacial chemistry in batteries via a concerted characterization approach. References Gao, L.N., Chen, J.E., Chen, Q.L. et al. The chemical evolution of solid electrolyte interface in sodium metal batteries. Science Advances 8, 4606 (2022). Xiang, Y., Zheng, G., Liang, Z. et al. Visualizing the growth process of sodium microstructures in sodium batteries by in-situ 23Na MRI and NMR spectroscopy. Nat. Nanotechnol. 15, 883–890 (2020). Han, B., Zou, Y., Zhang, Z. et al. Probing the Na metal solid electrolyte interphase via cryo-transmission electron microscopy. Nat Commun 12, 3066 (2021). Figure 1

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Dissertationen zum Thema "SEI stability"

Zhang, Qinglin. „IMPROVING THE CAPACITY, DURABILITY AND STABILITY OF LITHIUM-ION BATTERIES BY INTERPHASE ENGINEERING“. UKnowledge, 2016. http://uknowledge.uky.edu/cme_etds/60.

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This dissertation is focus on the study of solid-electrolyte interphases (SEIs) on advanced lithium ion battery (LIB) anodes. The purposes of this dissertation are to a) develop a methodology to study the properties of SEIs; and b) provide guidelines for designing engineered SEIs. The general knowledge gained through this research will be beneficial for the entire battery research community.

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Droguet, Léa. „Vers des électrolytes aqueux superconcentrés pour une application dans les batteries Li-ion“. Electronic Thesis or Diss., Sorbonne université, 2021. http://www.theses.fr/2021SORUS330.

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Depuis 2015, le développement des électrolytes aqueux superconcentrés, dénommés « Water-in-salt electrolytes » (WiSE), a suscité un regain d’intérêt pour les batteries Li-ion (LIB) aqueuses. Les WiSE proposent une alternative aux électrolytes organiques commerciaux qui posent des problèmes de sécurité et de durabilité, tout en résolvant les faibles performances des électrolytes aqueux dilués limitées par l’étroitesse de la fenêtre électrochimique (1 .23 V). En effet, la superconcentration influe sur les propriétés physico-chimiques et la réactivité interfaciale. La formation d’une interphase solide/électrolyte inorganique (SEI) riche en fluorure de lithium (LiF) ouvre la voie à l’utilisation d’électrode négative à bas potentiel et donc à l’augmentation de la densité d’énergie de ces batteries. Cette thèse étudie la viabilité des électrolytes WiSE dans les LIB. Grâce à la mise en place d’une étude systématique, l’impact de la superconcentration sur les performances des batteries en fonction des conditions d’opération montre que la SEI formée ne prévient pas de la réduction de l’eau, appelée réaction d’évolution de l’hydrogène (HER) ni pendant le cyclage ni pendant les périodes de repos, i.e. l’autodécharge. L’évaluation des vitesses de consommation de l’eau souligne les limites des propriétés protectrices de la SEI malgré la passivation de l’interface. Par ailleurs, la détermination des énergies d’activation de la HER directe, ayant lieu pendant le cyclage, et du phénomène d’autodécharge suggère que l’autodécharge est gouvernée par la HER. Enfin, l’évaluation de la solubilité de LiF dans les WiSE, des observations au microscope environnemental à balayage électronique et des mesures de chromatographie en phase gaz suggèrent que l’instabilité de la SEI est d’avantage reliée à des défauts microstructuraux qui ne peuvent pas être comblés dû à l’absence d’auto-passivation de l’interface. Une étape de pré-imprégnation dans un électrolyte organique réduit la consommation d’eau, confirmant la nécessité de propriétés d’autoréparation de la SEI
The development of superconcentrated aqueous electrolytes, namely Water-in-salt electrolytes (WiSE), from 2015 onwards has renewed the interest for aqueous-based Li-ion battery (LIB). Indeed, they were proposed to overcome issues related to safety and sustainability of common carbonate-based organic solvent while solving the poor performances of diluted aqueous electrolyte due to the narrow electrochemical stability window (ESW) of water (1.23 V). Such achievements are largely attributed to modification of the electrolyte structure upon increase in concentration that changes the physico-chemical properties and the interfacial reactivity. An inorganic LiF-based solid electrolyte interphase (SEI) was reported to be formed, opening the path for the use of low potential negative electrodes, further increasing the energy density of these batteries. This work aims to provide answers regarding the viability of WiSE in LIB. By conducting a systematic study of the impact of superconcentration on battery performances as function of the operating conditions, we demonstrate that the SEI is not able to prevent water reduction following the hydrogen evolution reaction (HER), neither during cycling nor during resting period, i.e. self-discharge. Indeed, the rates for water consumption calculated during cycling and resting period are found within the same order of magnitude, highlighting the SEI limitation to prevent water reduction although the surface is passivated. Determining the activation energies for HER during cycling and self-discharge, we suggest that self-discharge is more likely driven by water reduction than Li+ deintercalation. Eventually, LiF solubility measurements, gas chromatography tests and environmental scanning electron microscopy suggest that SEI instability is related to structural defects that cannot be self-passivated in WiSE. A presoaking step in organic electrolyte of an artificial Li/LiF layer reduces water consumption and thus confirms the need for the SEI to self-repair

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Akil, Mohammad. „Quelques problèmes de stabilisation directe et indirecte d’équations d’ondes par des contrôles de type fractionnaire frontière ou de type Kelvin-Voight localisé“. Thesis, Limoges, 2017. http://www.theses.fr/2017LIMO0043/document.

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Cette thèse est consacrée à l’étude de la stabilisation directe et indirecte de différents systèmes d’équations d’ondes avec un contrôle frontière de type fractionnaire ou un contrôle local viscoélastique de type Kelvin-Voight. Nous considérons, d’abord, la stabilisation de l’équation d’ondes multidimensionnel avec un contrôle frontière fractionnaire au sens de Caputo. Sous des conditions géométriques optimales, nous établissons un taux de décroissance polynomial de l’énergie de système. Ensuite, nous nous intéressons à l’étude de la stabilisation d’un système de deux équations d’ondes couplées via les termes de vitesses, dont une seulement est amortie avec contrôle frontière de type fractionnaire au sens de Caputo. Nous montrons différents résultats de stabilités dans le cas 1-d et N-d. Finalement, nous étudions la stabilité d’un système de deux équations d’ondes couplées avec un seul amortissement viscoélastique localement distribué de type Kelvin-Voight
This thesis is devoted to study the stabilization of the system of waves equations with one boundary fractional damping acting on apart of the boundary of the domain and the stabilization of a system of waves equations with locally viscoelastic damping of Kelvin-Voight type. First, we study the stability of the multidimensional wave equation with boundary fractional damping acting on a part of the boundary of the domain. Second, we study the stability of the system of coupled onedimensional wave equation with one fractional damping acting on a part of the boundary of the domain. Next, we study the stability of the system of coupled multi-dimensional wave equation with one fractional damping acting on a part of the boundary of the domain. Finally, we study the stability of the multidimensional waves equations with locally viscoelastic damping of Kelvin-Voight is applied for one equation around the boundary of the domain

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Park, Aaron W. „U. S. Navy Seabees as a stability asset“. Thesis, Monterey, California : Naval Postgraduate School, 2009. http://edocs.nps.edu/npspubs/scholarly/theses/2009/Sep/09Sep%5FPark.pdf.

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Thesis (M.A. in Security Studies (Stabilization and Reconstruction))--Naval Postgraduate School, September 2009.
Thesis Advisor(s): Porch, Douglas. "September 2009." Description based on title screen as viewed on November 5, 2009. Author(s) subject terms: Naval Mobile Construction Battalion (NMCB), Seabees, Stabilization and Reconstruction, Four Pillars, Provincial Reconstruction Team (PRT), Iraq, Afghanistan, Civil Military Operations, Insurgency, Counter-insurgency (COIN), Seabee Stability Team (SST) Includes bibliographical references (p. 51-53). Also available in print.

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Svensson, Nina. „Wind and atmospheric stability characteristics over the Baltic Sea“. Licentiate thesis, Uppsala universitet, Luft-, vatten och landskapslära, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-306948.

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In recent years there has been an increase in offshore wind energy, which poses the need for accurate wind speed estimates in the marine environment, especially in coastal areas where most wind turbines will be placed. This thesis is focused on the Baltic Sea, which is a small, semi-enclosed sea where land-sea interaction play an important role in explaining the wind patterns. Mesoscale model simulations can be used to study the marine environment, where observations are often scarce. In this thesis the Weather Research and Forecasting (WRF) model is used. In the first study simulations show that stable stratification over sea is very common in spring and summer and is associated with an increase in low-level jet occurrence and increased wind shear below 200 m, at heights where wind turbines are erected. The model performance in stable conditions is evaluated against aircraft measurements using several boundary layer parametrization schemes, and it is shown that the low-level jet height and strength is not accurately captured with any of the parametrizations. In the second study the advection of land features is investigated. From simulations, aircraft observations and satellite images it is shown that boundary layer rolls are created in the convective boundary layer over land, and advected several tens of kilometres out over sea surface, despite the stable stratification, where convective turbulence dissipates quickly. The occurrence of boundary layer rolls gives rise to horizontal wind speed variations of several meters per second over distances of kilometres, which can increase the uncertainty of short term wind speed forecasts in coastal areas with offshore flow. It is shown that mesoscale processes in and above the marine boundary layer are important in modifying the wind field in distances of at least 100 km from the coast and that models still need to be improved in order to capture these conditions.
Under de senaste decennierna har vindkraftsutbyggnaden ökat till havs, vilket innebär att det krävs tillförlitliga vindhastighetsuppskattningar över hav, särskilt i kustområden, där de flesta vindturbinerna kommer att placeras. Den här avhandlingen kommer att fokusera på Östersjön, vilket är ett relativt litet hav omgivet av landmassor, där land-hav-interaktion har en stor påverkan på vindmönstren över havet. Mesoskaliga modeller kan användas för att studera den lägre delen av den marina atmosfären. I den här avhandlingen används modellen "Weather Research and Forecasting" (WRF). I den första studien visar simuleringar att stabila förhållanden över havet är vanligt förekommande under sommar och vår, och sker i samband med en ökad förekomst av vindmaxima på låg höjd och ökad vindskjuvning under 200 m - alltså på höjder där vindkraftverk förekommer. Modellen, med flertalet gränskiktsparametriseringar, utvärderas för stabila fall mot flygplansmätningar, och resultaten visar att styrkan och höjden för vindmaxima är antingen över- eller underskattade oavsett parametrisering. I den andra studien undersöks advektiva fenomen. Simuleringar, flyplansobservationer och satellitbilder visar att avlånga rullvirvlar uppstår i det konvektiva gränsskiktet över land och advekteras flera tiotals kilometer över hav ut från kusten. Detta trots stabila förhållanden över havet, där den konvektiva turbulensen snabbt dör ut. Rullvirvlarna ger upphov till variationer i horisontell vindhastighet på flera meter per sekund över avstånd på några kilometer, vilket kan öka osäkerheten hos korttidsprognoser för vind när det är blåser från land. Sammanfattningsvis har det har visats att mesoskaliga processer i och ovanför det marina gränsskiktet har en stor inverkan på vindfältet åtminstone 100 km från kusten, och modeller behöver fortfarande förbättras för att kunna fånga dessa företeelser.
StandUp for Wind

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Macabies, Romain. „Proprietes et stabilite de l’interface isolant-pentacene dans les transistors organiques a effet de champ“. Thesis, Saint-Etienne, EMSE, 2011. http://www.theses.fr/2011EMSE0628/document.

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Le développement des transistors organiques, ces dernières années, a permis une nette amélioration de leurs performances et de leur stabilité. Ceci a été possible, notamment, grâce à une meilleure compréhension des mécanismes régissant le transport de charges dans ces dispositifs. Cependant, certains phénomènes restent encore à éclaircir, en particulier au niveau de l’interface entre le semi-conducteur et le diélectrique. Le piégeage des porteurs de charges qui est une des principales causes de perturbations du transport de charges dans les transistors organiques, en est un. Cette thèse se propose donc, d’étudier ce phénomène dans des transistors à base de pentacène.Les groupements polaires, et plus particulièrement les groupements hydroxyles, présents à l’interface entre l’isolant et le semi-conducteur, sont les principaux responsables du piégeage des porteurs de charges dans les transistors organiques. Afin de limiter leur présence, une technologie basée sur l’emploi d’une couche interfaciale diélectrique passivante, pauvre en groupements hydroxyles, à base de fluorure de calcium, a été mise en place. L’influence de cette couche sur le comportement de transistors à base de pentacène a été étudiée, de même que le vieillissement de ces dispositifs sous différentes conditions de stockage (sous vide et à l’air) et sous contrainte électrique.Ainsi, il a été mis en évidence qu’une couche de fluorure de calcium d’une épaisseur trop importante (de l’ordre de 5 nm) modifie la morphologie de la couche de pentacène, ce qui se traduit par une quasi-disparition du transport de charges dans le pentacène en configuration de transistor à effet de champ. Les études de vieillissement ont montré que sous l’effet de la couche interfaciale de CaF2, même d’une très fine épaisseur (de quelques nanomètres), une quantité plus importante d’humidité est présente dans la couche de pentacène, probablement à cause de la nature hygroscopique du fluorure de calcium
These recent years, Organic Field-Effect Transistor (OFET) development has significantly improved it performances and it stability. This was made possible, through a better understanding of the mechanisms governing charge transport in these devices. However, some phenomena remain unclear, in particular, at the interface between the semiconductor and the dielectric. Charge carrier trapping which is one of the main causes of charge transport disturbance in organic transistors, is one of them. So, this work aims to investigate such phenomena in pentacene-based transistors.Polar groups and particularly, hydroxyl groups, located at the insulator-semiconductor interface, are the main sources of charge carriers trapping in OFET. To prevent their presence, an OFET fabrication technology based on a passivating dielectric, poor of hydroxyl groups, calcium fluoride-based interfacial layer has been developed. Effect of this layer on pentacene-based transistors operation has been studied, as well as these devices aging under different storage atmosphere (in vacuum and in air) and under electrical stress.Thus, it has been highlighted that an interfacial layer of calcium fluoride with a too high thickness (around 5 nm) changes pentacene layer morphology which results in a quasi-disappearance of charge transport in pentacene in OFET configuration. Aging studies showed that under the effect of CaF2 interfacial layer, even with a very thin thickness (a few nanometers), a greater quantity of moisture is induced in pentacene layer probably due to the hygroscopic nature of calcium fluoride

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LaBauve, Jeffrey W. „China and Japan's strategic nuclear relationship“. Thesis, Monterey, California : Naval Postgraduate School, 2009. http://edocs.nps.edu/npspubs/scholarly/theses/2009/Sep/09Sep%5FLaBauve.pdf.

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Thesis (M.A. in Security Studies (Far East, Southeast Asia, and the Pacific))--Naval Postgraduate School, September 2009.
Thesis Advisor(s): Twomey, Christopher P. "September 2009." Description based on title screen as viewed on 5 November 2009. Author(s) subject terms: Deterrence, Japan, China, Nuclear Missile Defense. Includes bibliographical references (p. 57-66). Also available in print.

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Atlar, M. „Towards the understanding of the steady tilt phenomenon in semi-submersibles“. Thesis, University of Glasgow, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.378157.

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Sopaci, Evrim. „Stability Investigations Along The Ordu Peripheral Highway“. Master's thesis, METU, 2003. http://etd.lib.metu.edu.tr/upload/1054857/index.pdf.

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The Eastern Black Sea region of Turkey accomodates indecent residence conditions for people owing to ground conditions comprising of volcanics and concurrent flysch, and its related irregular geomorphology. One of the important difficulties in this region is transportation. Accordingly, the ordu peripheral highway which encompasses various structures such as, open cuts, bridges, viaducts and junctions and double tubed tunnel sections which will be driven in these geological and geomorphological conditions is palnned to be constructed. In regional scale, volcanics, pyroclastics and flysch deposits often intertounge with each other even over very short distances. The accurate determination of the shear strength parameters of these lithologies is vital for the assessment of portal slope stability and support design in regards to tunnel design. Rock mass classification systems, namley, RMR, NGI Q system and GSI, have been employed to obtain the rock mass shear strength parameters. Stress analyses around the tunnel opennings have been executed through employing 2D finite element analysis in an attempt to design tunnel support. The results of the analysis have been correlated with the results obtained from the emprical methods. The overall analyses and interpretations led to the determination of the support systems to be employed during tunnel construction.

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Issa, Ibtissam. „Some results on the stabilization of elastic/viscoelastic transmission problems with Kelvin-Voigt or fractional Kelvin-Voigt damping“. Thesis, Aix-Marseille, 2021. http://theses.univ-amu.fr.lama.univ-amu.fr/211207_ISSA_690cu840ucxbzr880kpmyt859oe_TH.pdf.

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Cette thèse est consacrée à l'étude de la stabilisation de certains systèmes localement couplés. Tout d'abord, nous étudions la stabilité d'équations d'onde couplées unidimensionnelles avec deux amortissements visqueux intérieurs non lisses où nous établissons une stabilité exponentielle. Dans un second temps, nous étudions la stabilisation d'équations d'onde localement couplées avec un seul amortissement viscoélastique interne de type Kelvin-Voigt. L'amortissement et les coefficients de couplage ne sont pas lisses. En utilisant une approche spectrale, nous démontrons la stabilité non uniforme du système. Ensuite, en utilisant une approche dans le domaine fréquentiel, combinée à une technique de multiplicateur par morceaux et à la construction d'un nouveau multiplicateur satisfaisant quelques équations différentielles ordinaires, nous montrons que l'énergie de la solution lisse du système décroît polynomiale. Troisièmement, nous étudions la décroissance énergétique de systèmes hyperboliques de type onde-onde, onde-Euler Bernoulli et faisceau-faisceau. En effet, les deux équations sont couplées par liaison limite avec un seul amortissement fractionnaire Kelvin Voigt localisé non lisse. Nous établissons un taux de décroissance d'énergie polynomial. Enfin, nous étudions la stabilité d'un système multidimensionnel de deux équations d'onde couplées par des vitesses avec un seul amortissement Kelvin-Voigt localisé non lisse. En utilisant une analyse spectrale, nous prouvons la stabilité non uniforme du système. Nous établissons des résultats de stabilité polynomiale en considérant différentes conditions géométriques sur les domaines de couplage et d'amortissement
This thesis is devoted to study the stabilization of some locally coupled systems. First, we study the stability of a one-dimensional coupled wave equations with two interior non smooth viscous dampings where we establish exponential stability. Second, we study the stabilization of a locally coupled wave equations with only one internal viscoelastic damping of Kelvin-Voigt type. Both the damping and the coupling coefficients are non smooth. Using a spectrum approach, we prove the non-uniform stability of the system. Next, using a frequency domain approach, combined with a piecewise multiplier technique and the construction of a new multiplier satisfying some ordinary differential equations, we show that the energy of the smooth solution of the system decays polynomially. Third, we investigate the energy decay of hyperbolic systems of wave-wave, wave-Euler Bernoulli beam and beam-beam types. Indeed, the two equations are coupled through boundary connection with only one localized non smooth fractional Kelvin Voigt damping. We establish a polynomial energy decay rate. Finally, we study the stability of a multidimensional system of two wave equations coupled by velocities with only one localized non-smooth Kelvin-Voigt damping. By using a spectral analysis, we prove the non uniform stability of the system. Further, using a frequency domain approach combined with a multiplier technique, we establish some polynomial stability results by considering different geometric conditions on the coupling and the damping domains. In addition, in the absence of any geometric condition, we establish two polynomial energy decay rates of the system on a square domain

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Bücher zum Thema "SEI stability"

Rowny, Edward L. SDI, enhancing security and stability. Washington, D.C: U.S. Dept. of State, Bureau of Public Affairs, Office of Public Communication, Editorial Division, 1988.

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Rowny, Edward L. SDI, enhancing security and stability. Washington, D.C: U.S. Dept. of State, Bureau of Public Affairs, Office of Public Communication, Editorial Division, 1988.

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Rowny, Edward L. SDI, enhancing security and stability. Washington, D.C: U.S. Dept. of State, Bureau of Public Affairs, Office of Public Communication, Editorial Division, 1988.

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C, Wall C. T., Hrsg. The geometry of topological stability. Oxford: Clarendon Press, 1994.

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Plessis, Andrew Du. The geometry of topological stability. Oxford: Clarendon Press, 1995.

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International Institute for Strategic Studies., Hrsg. Strategic stability in the Arctic. London: Brasseys̓ for the International Institute for Strategic Studies, 1989.

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Chengi, Kuo, University of Strathclyde, Society for Underwater Technology und Royal Institution of Naval Architects., Hrsg. Stationing and stability of semi-submersibles. London, UK: Graham & Trotman, 1986.

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Nitze, Paul H. SDI, arms control, and stability: Toward a new synthesis. Washington, D.C: U.S. Dept. of State, Bureau of Public Affairs, Office of Public Communication, Editorial Division, 1986.

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1958-, Wirtz James J., und Larsen Jeffrey Arthur 1954-, Hrsg. Naval peacekeeping and humanitarian operations: Stability from the sea. Milton Park, Abingdon, Oxon: Routledge, 2009.

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Bednarczuk, Ewa. Stability analysis for parametric vector optimization problems. Warszawa: Institute of Mathematics, Polish Academy of Sciences, 2007.

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Buchteile zum Thema "SEI stability"

Anakira, Nidal, Amel Hioual, Adel Ouannas, Taki-Eddine Oussaeif und Iqbal M. Batiha. „Global Asymptotic Stability for Discrete-Time SEI Reaction-Diffusion Model“. In Mathematics and Computation, 345–57. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-0447-1_30.

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Menini, Laura, und Antonio Tornambè. „Stability Analysis“. In Symmetries and Semi-invariants in the Analysis of Nonlinear Systems, 293–328. London: Springer London, 2011. http://dx.doi.org/10.1007/978-0-85729-612-2_8.

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Goberna, Miguel A., und Marco A. López. „Qualitative Stability Analysis“. In Post-Optimal Analysis in Linear Semi-Infinite Optimization, 61–77. New York, NY: Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4899-8044-1_5.

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Goberna, Miguel A., und Marco A. López. „Quantitative Stability Analysis“. In Post-Optimal Analysis in Linear Semi-Infinite Optimization, 79–107. New York, NY: Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4899-8044-1_6.

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Aubin, Jean-Pierre, und Hèléne Frankowska. „Existence and Stability of an Equilibrium“. In Set-Valued Analysis, 1–40. Boston: Birkhäuser Boston, 2008. http://dx.doi.org/10.1007/978-0-8176-4848-0_3.

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Grimm, Volker, Hauke Bietz, Carmen-Pia Günther, Andreas Hild, Marlies Villbrandt, Verena Niesel, Ulrike Schleier und Sabine Dittmann. „Stability Properties in the Wadden Sea“. In The Wadden Sea Ecosystem, 227–59. Berlin, Heidelberg: Springer Berlin Heidelberg, 1999. http://dx.doi.org/10.1007/978-3-642-60097-5_9.

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Bačkalov, Igor. „A Probabilistic Analysis of Stability Regulations for River-Sea Ships“. In Contemporary Ideas on Ship Stability, 707–23. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-00516-0_41.

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Katayama, Toru, Mai Kankaku, Atsuo Maki, Kei Sugimoto und Yusuke Fukumoto. „Study on Short-Term Prediction of Roll in Beam Sea“. In Contemporary Ideas on Ship Stability, 143–56. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-16329-6_9.

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Martynyuk, Anatoly A. „Stability of Systems with Aftereffect“. In Qualitative Analysis of Set-Valued Differential Equations, 123–34. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-07644-3_5.

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Tadros, Tharwat. „Colloid Stability of Biocolloidal Dispersions“. In Encyclopedia of Biocolloid and Biointerface Science 2V Set, 1004–13. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2016. http://dx.doi.org/10.1002/9781119075691.ch81.

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Konferenzberichte zum Thema "SEI stability"

Joseph, G. Arul, und S. Balamuralitharan. „Global stability analysis of human SEIV-mosquitoes SEI model for malaria transmission“. In 1ST INTERNATIONAL CONFERENCE ON MATHEMATICAL TECHNIQUES AND APPLICATIONS: ICMTA2020. AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0025240.

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Xu, Wentao, Jiangong Zhu, Jie Zhang, Yiqun Jin, Xiuwu Wang, Xuezhe Wei und Haifeng Dai. „Revealing the Impact of Mechanical Pressure on Lithium-Ion Pouch Cell Formation and the Evolution of Pressure During the Formation Process“. In WCX SAE World Congress Experience. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2024. http://dx.doi.org/10.4271/2024-01-2192.

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<div class="section abstract"><div class="htmlview paragraph">The formation is a crucial step in the production process of lithium-ion batteries (LIBs), during which the solid electrolyte interphase (SEI) is formed on the surface of the anode particles to passivate the electrode. It determines the performance of the battery, including its capacity and lifetime. A meticulously designed formation protocol is essential to regulate and optimize the stability of the SEI, ultimately achieving the optimal performance of the battery. Current research on formation protocols in lithium-ion batteries primarily focuses on temperature, current, and voltage windows. However, there has been limited investigation into the influence of different initial pressures on the formation process, and the evolution of cell pressure during formation remains unclear. In this study, a pressure-assisted formation device for lithium-ion pouch cells is developed, equipped with pressure sensors. This device allows for precise adjustment of the initial pressure during cell formation and enables the recording of pressure evolution. Employing the initial pressure as a variable, five groups of pouch cells are subjected to distinct initial pressure settings for individual formation processes. Simultaneously, the pressure evolution signals during formation are meticulously recorded. The results reveal that applying an appropriate initial pressure (0.05/0.1 MPa) during the formation resulted in a capacity enhancement of over 2% for the pouch cells, accompanied by significantly improved consistency. Conversely, both inadequate and excessive pressure adversely affect the capacity of the battery. The effectiveness of the formation is analyzed using rate capability testing, electrochemical impedance spectroscopy (EIS) testing, battery disassembling, and scanning electron microscopy (SEM). Additionally, the pressure evolution during formation is scrutinized to track the growth of the SEI from a unique perspective.</div></div>

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Soule, Danald. „Stability in a sea of change“. In Conference proceedings. New York, New York, USA: ACM Press, 1990. http://dx.doi.org/10.1145/97808.97871.

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Goh, Patrick, Jose E. Schutt-Aine, Dmitri Klokotov, Jilin Tan, Ping Liu, Wenliang Dai und Feras Al-Hawari. „Partitioned latency insertion method (PLIM) with stability considerations“. In 2011 IEEE 15th Workshop on Signal Propagation on Interconnects (SPI). IEEE, 2011. http://dx.doi.org/10.1109/spi.2011.5898851.

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Biasotti, Silvia, und Marco Attene. „SHape REtrieval contest 2008: Stability of watertight models“. In 2008 IEEE International Conference on Shape Modeling and Applications (SMI). IEEE, 2008. http://dx.doi.org/10.1109/smi.2008.4547975.

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Sadeghpour, Mehdi, und Gábor Orosz. „On the Stability of Continuous-Time Systems With Stochastic Delay: Applications to Gene Regulatory Circuits“. In ASME 2014 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/detc2014-35139.

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In this paper the dynamics and stability of a linear system with stochastic delay are investigated. We assume that the delay may take finitely many different values and its dynamics are modeled by a continuous-time Markov chain. Semi-discretization is used to derive the dynamics of the second moment which leads to necessary and sufficient stability conditions for the trivial solution. We apply these results to investigate the stability of the steady state of an auto-regulatory gene-protein network. We demonstrate that stochastic delay may stabilize the system when the corresponding deterministic system with average delay is unstable.

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Maximov, Vasily V., und Tatyana F. Zavadskaya. „Modelling of interaction of sea waves between the “source-sink” hydrodynamical system“. In 2015 International Conference "Stability and Control Processes" in Memory of V.I. Zubov (SCP). IEEE, 2015. http://dx.doi.org/10.1109/scp.2015.7342153.

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Meng, Xiao-Ying, Fei-Qi Deng und Ytjn-Jian Peng. „Stability of SEIR system with random perturbations“. In 2010 International Conference on Machine Learning and Cybernetics (ICMLC). IEEE, 2010. http://dx.doi.org/10.1109/icmlc.2010.5580967.

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Kongnuy, Rujira. „Stability of a Seasonal-Structured SEIR Model“. In Artificial Intelligence and Applications / Modelling, Identification, and Control. Calgary,AB,Canada: ACTAPRESS, 2011. http://dx.doi.org/10.2316/p.2011.718-021.

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Ibeas, Asier, Manuel de la Sen, Santiago Alonso-Quesada und Raul Nistal. „Partial stability of controlled SEIR epidemic models“. In 2013 European Control Conference (ECC). IEEE, 2013. http://dx.doi.org/10.23919/ecc.2013.6669275.

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Berichte der Organisationen zum Thema "SEI stability"

Rowny, Edward L. SDI: Enhancing Security and Stability. Fort Belvoir, VA: Defense Technical Information Center, März 1988. http://dx.doi.org/10.21236/ada351518.

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Hansen, Gregory A., und Edwin A. Frame. Generator Set Environmental and Stability Testing. Fort Belvoir, VA: Defense Technical Information Center, Februar 2015. http://dx.doi.org/10.21236/ada626570.

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Nitz, Paul H. SDI, Arms Control, and Stability: Toward a New Synthesis. Fort Belvoir, VA: Defense Technical Information Center, Juni 1989. http://dx.doi.org/10.21236/ada344721.

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Arveson, Paul, und Ralph Goodman. Low-frequency Sea Surface Scattering Levels as a Function of Stability. Fort Belvoir, VA: Defense Technical Information Center, September 1997. http://dx.doi.org/10.21236/ada629296.

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Moltz, James C. Submarine and Autonomous Vessel Proliferation: Implications for Future Strategic Stability at Sea. Fort Belvoir, VA: Defense Technical Information Center, Dezember 2012. http://dx.doi.org/10.21236/ada578475.

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Amos, C. L., T. Sutherland und J. Zevenhuizen. Sea carousel measurements of seabed stability in Manitounuk Sound, Grande Baleine, Hudson Bay. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1993. http://dx.doi.org/10.4095/183970.

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Suitner, Niels. Data set on the dissolution experiments available. OceanNets, März 2023. http://dx.doi.org/10.3289/oceannets_d5.1.

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Abiotic laboratory-based experiments were undertaken to determine the characteristics of mineral dissolution in seawater and thereby examine the potential for ocean alkalinization applications. As part of the mesocosm campaigns on Gran Canaria 2021 (WP5.3) and Bergen 2022 (WP5.4) we contributed to the impact assessment of OAE by conducting labbased experiments, focused on the carbonate chemistry and the stability of alkalinity in TA enhanced seawater. Due to extensive precipitation of secondary Ca-carbonates during the dissolution experiments, the focus of WP5.1 changed from mineral dissolution experiments to describing and avoiding the process of runaway precipitation while studying the generation of alkalinity. Understanding when, why and how precipitation is triggered in an OAE context might be an essential factor to determine the potential as a negative emission technology. All data sets for the dissolution experiments, the precipitation process and critical thresholds are available for project members.

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Otrok, Christopher, Huigang Chen, Alessandro Rebucci, Gianluca Benigno und Eric R. Young. Optimal Policy for Macro-Financial Stability. Inter-American Development Bank, Dezember 2012. http://dx.doi.org/10.18235/0011440.

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This paper studies whether policymakers should wait to intervene until a financial crisis strikes or rather act in a preemptive manner. This question is examined in a relatively simple dynamic stochastic general equilibrium model in which crises are endogenous events induced by the presence of an occasionally binding borrowing constraint as in Mendoza (2010). First, the paper shows that the same set of taxes that replicates the constrained social planner allocation could be used optimally by a Ramsey planner to achieve the first best unconstrained equilibrium: in both cases without any precautionary intervention. Second, the paper shows that the extent to which policymakers should intervene in a preemptive manner depends critically on the set of policy tools available and what these instruments can achieve when a crisis strikes. For example, in the context of the model, it is found that, if the policy tools are constrained so that the first best cannot be achieved and the policymaker has access to only one tax instrument, it is always desirable to intervene before the crisis regardless of the instrument used. If, however, the policymaker has access to two instruments, it is optimal to act only during crisis times. Third and finally, the paper proposes a computational algorithm to solve Markov-perfect optimal policy for problems in which the policy function is not differentiable.

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Nakov, Anton, und Carlos Thomas. Climate-conscious monetary policy. Madrid: Banco de España, November 2023. http://dx.doi.org/10.53479/34755.

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We study the implications of climate change and the associated mitigation measures for optimal monetary policy in a canonical New Keynesian model with climate externalities. Provided they are set at their socially optimal level, carbon taxes pose no trade-offs for monetary policy: it is both feasible and optimal to fully stabilize inflation and the welfare-relevant output gap. More realistically, if carbon taxes are initially suboptimal, trade-offs arise between core and climate goals. These trade-offs however are resolved overwhelmingly in favor of price stability, even in scenarios of decades-long transitions to optimal carbon taxation. This reflects the untargeted, inefficient nature of (conventional) monetary policy as a climate instrument. In a model extension with financial frictions and central bank purchases of corporate bonds, we show that green tilting of purchases is optimal and accelerates the green transition. However, its effect on CO2 emissions and global temperatures is limited by the small size of eligible bonds’ spreads.

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Pagliacci, Carolina, und Nora Guarata. Understanding Financial Fluctuations and Their Relation to Macroeconomic Stability. Inter-American Development Bank, Mai 2017. http://dx.doi.org/10.18235/0011801.

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This paper examines how financial fluctuations and macroeconomic stability interact in the case of Venezuela, acknowledging that financial conditions deteriorating the macroeconomic environment can arise with both good and bad macroeconomic performance. An empirical methodology is provided that constructs two indexes, which are fully interpretable and are constructed with a minimum set of assumptions applied to a large number of financial time series. Structural interpretation of indexes is pursued using a structural VAR (SVAR) that associates macroeconomic stability with financial indexes. For Venezuela, a deterioration of procyclical financial conditions relates to financial margin reductions and expansions in banks’ balance sheets, which are mostly triggered by unexpected increases in net primary money creation. Such expansions tend to appear in situations of declining macroeconomic stability. Worse countercyclical financial conditions are instead associated with situations of rising bank profitability, deleveraging and increased banking instability. In this case, fragility tends to materialize in periods of ameliorated macroeconomic stability.

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