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.
Results
Showing 1 to 20 of 28 for “"Li ions"”.
-
Functional expression and initial biochemical characterization of Yp-NhaP, cation-proton antiporter from Yersinia pestis
… form in the antiporter-deficient strain of E. coli, TO114. When assayed in inside-out sub-bacterial membrane vesicles, Yp-NhaP acted as an electroneutral cation/proton antiporter, exchanging Ca2+, K+, Na+ and Li+ ions for H+. Competition experiments suggested that in vivo Yp-NhaP operates as …
-
Thermal conductivity switching of polymers and lithium-ion battery electrode materials in response to external stimuli
Advances in technologies have led to a utilization of a wide range of transport, storage and release of energy as a form of heat. Researchers in electronics, thermoelectrics, energy science and biomaterials seek for materials with either high or low thermal conductivity as they help to manage heat …
-
Tunable viscoelasticity, morphology, and charge transport of dynamic covalent polymers
Dynamic covalent bonds are reversible chemical linkages, enabling materials to undergo bond rearrangements in response to external stimuli. This dynamic behavior has led to the emergence of vitrimers that retain network integrity while exhibiting flow at elevated temperatures via associative bond …
-
MULTI-IONIC LITHIUM SALTS FOR USE IN SOLID POLYMER ELECTROLYTES FOR LITHIUM BATTERIES
Commercial lithium ion batteries use liquid electrolytes because of their high ionic conductivity (>10-3 S/cm) over a broad range of temperatures, high dielectric constant, and good electrochemical stability with the electrodes (mainly the cathode cathode). The disadvantages of their use in lithium …
-
Structure and properties of the interdiffused phase between lithiated silicon and copper current collector
Silicon is an important electrode material for next generation high performance lithium ion batteries due to its order of magnitude higher charge carrying capacity compared to conventional graphite electrodes. The main obstacle of using Si electrodes in commercial lithium batteries is the massive …
-
Electrochemical lithiation and delithiation for control of magnetic properties of nanoscale transition metal oxides
… electronic properties, ranging from half-metallic ferromagnets like CrO2, ferrimagnetic semiconductors like Fey's, and antiferromagnetic insulators like rocksalt-structured FeO. The accessibility of multiple electronic configurations and coordination of cations in these oxides enables the …
-
FIRST-PRINCIPLES SIMULATIONS OF SOLID STATE BATTERY MATERIALS
In this work materials with possible applications in all solid state Li-ion batteries are explored using computational methods within the framework of density functional theory and kinetic Monte Carlo. The density functional theory simulations use fundamental quantum mechanics along with some …
-
Material engineering for Li-ion capacitors and Li-ion batteries
… behind personal and industrial electronics. Li-ion batteries became the most prevalent rechargeable energy storage technology in market because of a high energy density. However, a power density (especially charging) of Li-ion batteries is not satisfactory for certain applications. In this …
-
DEVELOPMENT OF NANO-STRUCTURED METAL OXIDES/GRAPHENE FOR ENERGY APPLICATIONS
… work centered on the investigation of V2O5 and LiFePO4 as the cathode materials for Li-ion batteries. The first part is about the investigation of structure evolution of vanadium oxide (V2O5) nanocrystals during the Li+ ion intercalation and deintercalation processes using in operando …
-
DEVELOPMENT OF NANO-STRUCTURED METAL OXIDES/GRAPHENE FOR ENERGY APPLICATIONS
… work centered on the investigation of V2O5 and LiFePO4 as the cathode materials for Li-ion batteries. The first part is about the investigation of structure evolution of vanadium oxide (V2O5) nanocrystals during the Li+ ion intercalation and deintercalation processes using in operando …
-
Understanding the Limits of Lithium-Air Batteries – NMR and Thermodynamic Studies
Lithium-air batteries promise to deliver exceptionally high energy density while only using common materials, such as carbon, in their cathode structure. To do this, they oxidise a metallic lithium anode to release Li+ ions, which combine with O<sub>2</sub><sup>2-</sup> ions, produced from the …
-
Stimuli-Induced Structural Transformations of Metal–Organic Cages
… that respond adaptively to external stimuli. In particular, biological systems rely on precise, stimuli-induced structural changes to regulate complex functions such as molecular recognition, transport, and catalysis. Inspired by these systems, metal–organic cages (MOCs) have emerged as …
-
Understanding two-phase reaction processes in electrodes for Li-ion batteries
… large volume changes, is generally considered to limit the high rate application of any battery electrode material. Contrary to this perception, nanoparticulate LiFePO$_{4}$ exhibits exceptionally high rates although the large Li miscibility gap in the Li-composition phase diagram dictates that …
-
Improving energy and power densities of three-dimensional next generation secondary battery electrodes
… 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. Majority of these work focus on improving electrical conductivity and thus rate performance of the …
-
Structure- and Composition-Performance Relationships of Electrically Conductive Metal-Organic Frameworks, Conjugated Porous Organic Polymers, and Fused Aromatics
… with permanent porosity and structural modulability, electrically conductive metal-organic frameworks (MOFs), have drawn increasing attention due to their potential use in a variety of applications including electrochemical energy storage (EES). Although fully conjugated porous organic polymers …
-
New metastable cathode materials for lithium-ion batteries
… discovery and study of new cathode materials for lithium-ion batteries. To obtain new materials, a well-known strategy based on ion-exchanging alkali metals within stable crystalline frameworks was used. Ion-exchange procedures between sodium and lithium ions were performed on known sodiated …
-
Understanding and Exploiting Anion Redox Process for High Energy Density Positive Electrode Materials for Li-ion Batteries
… a better solution for energy storage systems. Li-ion battery system give rise to such opportunity by providing reasonable cycle life and energy density. It was widely assumed that Li-ion battery positive electrode materials, Li transition metal oxides, store charges through the redox activity …
-
Novel Magnetic Resonance Techniques as Applied to Metallic Phases in Lithium-Ion Battery Electrodes
Since their introduction in the late 1990s, lithium-ion batteries (LIBs) have played an increasingly important role in society, powering portable electronics, electric vehicles and grids. As such, they are critical in paving the way to net-zero carbon emissions. The prototypical anode and cathode …
-
Investigation of lithium-air battery discharge product formed on carbon nanotube and nanofiber electrodes
… for integration in a wide variety of applications since their discovery over 20 years ago. Their myriad desirable material properties including exceptional mechanical strength, high thermal conductivities, large surface-to-volume ratios, and considerable electrical conductivities, which …
-
Design and Characterization of Electrospun Mats with Tailored Morphologies for Enhanced Active Layer Performance in Energy Conversion and Energy Storage Applications
The goal of this research was to utilize the morphological control inherently imparted by the electrospinning process to improve the active layer performance in energy conversion devices as well as to better understand the relationship between morphology and performance in energy storage devices. …
Page 1 of 2