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 37 for “"Positive Electrode"”.
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Understanding and Exploiting Anion Redox Process for High Energy Density Positive Electrode Materials for Li-ion Batteries
… It was widely assumed that Li-ion battery positive electrode materials, Li transition metal oxides, store charges through the redox activity of transition metal species, accompanied by the intercalation and deintercalation of Li-ions into and out of the host structure. Layered lithium …
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Lithium ion power generator : a novel system for direct thermal to electric energy conversion
… the effect of the system. LiCo02 used as a positive electrode with LiV2Os as a negative electrode (LCO/LVO) could theoretically generate 0.9mvK-1 in the dual-temperature system. Additionally, LCO/LVO cells used in conjunction with LiNio.Mno.1Co0.1O2 used as a positive electrode and LiFePO 4 …
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Electrochemical properties of crystalline polymorphs of MnO2 in aluminum and zinc metal batteries
… coulombic capacities, which make them promising electrode materials for “beyond lithium-ion” battery chemistries. However, the electrochemical feasibility and charge storage mechanisms of alternative Al and Zn battery systems, particularly when paired low-cost positive electrode materials, must …
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Thermodynamic properties and atomic structure of Ca-based liquid alloys
To identify the most promising positive electrodes for Ca-based liquid metal batteries, the thermodynamic properties of diverse Ca-based liquid alloys were investigated. The thermodynamic properties of Ca-Sb alloys were determined by emf measurements. It was found that Sb as positive electrode …
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Understanding electronic structure and interfaces of positive electrodes for lithium ion batteries
… One of the key parameters to study is electrode/electrolyte interface of electrodes. EEI on the negative electrode, also known as Solid Electrolyte Interphase (SEI) has the well-known structure with organic and inorganic compounds. Although EEI on negative electrodes is well known, it …
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Understanding the pathway and mechanism of electrolyte decomposition on metal oxide surfaces in Li-ion batteries by in situ Fourier Transform Infrared Spectroscopy
Understanding (electro)chemical reactions at the electrode-electrolyte interface (EEI) is crucial to promote the cycle life of lithium-ion batteries. In situ studies of EEI can provide new insights into reaction intermediates and soluble species not accessible by ex situ characterization of …
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Electronic transport in Lithium Nickel Manganese Oxide, a high-voltage cathode material for Lithium-Ion batteries
… Manganese Oxide (LixNi1i/2Mn3/2O4, or LNMO) as a positive electrode material appears to be one of the shortest. LNMO is a high-voltage material, with a voltage of 4.7V, and thus offers a significant energy density boost without straying far outside of the stability window of common carbonate-based …
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A multi-functional electrolyte for lithium-ion batteries
… upon heat absorption in small channels in the positive electrode of the cell. The inert fluid HFE-7000 is investigated as the volatile co-solvent in the MFE (1 M LiTFSI in 1:1 HFE-7000/ethyl methyl carbonate by volume) for the proposed TMS. In the first phase of the study, the baseline …
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The Correlation Between Electrical Pulses and Light Flashes in a Proportional Counter.
… and ions are swept toward the collecting electrodes. The electric field strength is adjusted to a value such that the electrons on their way to the positive electrode cause further ionization. The total charge collected at the electrodes is proportional to the charge separated by the …
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Technical and economic feasibility of a high-temperature self-assembling battery
… solid phase, the novel three-layer liquid-phase electrode-electrolyte-electrode cell facilitates high diffusivity and facile interfacial kinetics, which results in rapid ion transport and low activation overpotential. In addition to the extremely high currents enabled by the absence of …
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Electrochemical and microstructural studies of AlPO₄-nanoparticle coated LiCoO₂ for lithium-ion batteries
AlPO₄-nanoparticle coated LiCoO₂ 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 …
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Electrically evoked motions of the isolated mouse tectorial membrane
… shows that the TM expands near the negative electrode and contracts near the positive electrode with a stationary pivot point between the two electrodes. Lowering the pH in the bath surrounding the TM from 7.3 to 4.07 decreased the maximum amplitude of displacement from 4 nm to approximately …
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Biomembranas formuojančių monosluoksnių ir adsorbuotų biomolekulių struktūros tyrimas virpesinės spektroskopijos metodais /
… membranes (tBLM) and laccase enzymes at the electrode surface in water and controlled electric potential environments. Water is crucial in maintaining the native state of biomolecules, while the electric methods are widely used in studying such biomolecules. To realize how these forces affect …
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Linear and Nonlinear Electrochemical Impedance Spectroscopy for Lithium-ion Batteries
… toward kinetics that favor oxidation on the positive electrode (α<sub>a,pos</sub> > 0.5, α<sub>c,pos</sub> < 0.5) occurs as the cell is aged. Furthermore, modeling insights and experimental measurements of linear EIS and second harmonic NLEIS spectra at different states-of-charge (SoC) and …
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Modeling the operating voltage of liquid metal battery cells
… alloys and calibrate a two-phase Mg-Sb reference electrode. The charge transfer kinetics at the alloying electrode were studied using the galvanostatic pulse method and a novel working electrode design. The contribution of the charge transfer reaction to the cell operation was found to be …
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Liquid metal batteries : ambipolar electrolysis and alkaline earth electroalloying cells
… 500 0C was first investigated by two- and three-electrode electrochemical analysis techniques. The electrochemical behavior of the melt, thermodynamic properties, and kinetic properties were evaluated. A single cell battery was constructed, demonstrating for the first time the simultaneous …
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Molecular-Level Understanding of Ionic & Electronic Charge Storage Mechanisms in Rechargeable Aluminum Batteries Using Sold-State NMR
… of aluminum. However, very few electrode materials have shown reversible aluminum ion intercalation. Intercalation Al<sup>3+</sup> ions in these structures leads to poor capacity retention, mainly due to slow solid-state diffusion of the highly charged tri-valent aluminum ions …
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Modelling and simulation of all-vanadium redox flow batteries
… as a result of evolution at the negative/positive electrode is included in the model, taking into account the attendant reduction in the liquid volume and the transfer of momentum between the gas and liquid phases, using a modified multiphase-mixture approach. Comparisons to simulations …
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Electrochemically driven phase transformation in energy storage compounds
… olivines have become commercially important as positive electrode materials in a new generation of lithium-ion batteries. Not surprisingly, many energy storage compounds undergo phase transitions in-situ, including the production of metastable phases. Unique to this environment is the frequent …
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