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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 748 for “"Cathode"”.
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Hollow cathode life time modelling
Hollow Cathodes (HCs) are of primary importance in the field of electric space propulsion, being used as electron sources in ion and Hall-effect thrusters. Hence, their lifetime is a key factor in all these applications.<br/><br/>HCs have demonstrated the capability of providing up to 30,000 hours …
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Physics-Based Li-Svo Cathode Model
<p>A cathode half cell physics-based model for a St. Jude Medical fabricated silver vanadium oxide (SVO) cathode coin cell battery was constructed. The model is based on a single particle Fick's second law approach with the open-circuit potential modeled with a Redlich-Kister equation. By assuming …
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Characterization of hot cathode helimak plasma
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1994.
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Rapid screening of PEM FC cathode catalysts
… for the oxygen reduction reaction (ORR) at the cathode of PEMFCs. The first system developed was the 64 channel pin electrode array, using liquid electrolyte. The developed method improved both the quality and reproducibility of the data and has been used to rank catalyst samples, as well as to …
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A hollow cathode source for spectroscopic investigations.
… promising types of light source is the hollow cathode glow discharge tube. In view of this, the present research was undertaken to develop, build, and study a hollow cathode glow discharge tube and the necessary vacuum, circulating, purifying system, for use with the high resolution instrument …
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Characterization of carbon fiber flocked cathode materials
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Nuclear Engineering, 1996.
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Layered perovskites as cathode materials for IT-SOFC
… (Ln = Sm & Gd) has been investigated as cathode material for intermediate temperature solid oxide fuel cell using Ce₀.₉Gd₀.₁O₁.₉₅ (GDC) and La₀.₉Sr₀.₁Ga₀.₈Mg₀.₂O₃-δ (LSGM-9182) as the electrolyte material. Both oxides crystallize in tetragonal P4/nmm symmetry. The structural and phase …
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New metastable cathode materials for lithium-ion batteries
… is dedicated to the 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 …
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Field emission from a multiple emitter composite cathode.
Massachusetts Institute of Technology. Dept. of Physics. Thesis. 1965. B.S.
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Operation Mode Transitions in a Heaterless Hollow Cathode
Hollow cathodes are used to neutralize ions in electric propulsion systems, and are a lifetime-limiting component due to the presence of high-energy ions generated in the plasma plume. These ions impact the cathode's keeper electrode destroying it over a period of tens of thousands of hours. The …
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Aerosol Synthesis Of Cathode Materials For Li-Ion Batteries
… developed to produce high-quality, spherical cathode materials. These processes have many advantages over conventional processes including:: 1) the ability to consistently produce uniform porous spherical particles,: 2) low-cost,: 3) simplicity, and: 4) precise control over particle …
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Transition Metal Oxides for Cathode of Li-ion Battery
Layered transition metal oxides are used as cathode materials in Li-ion batteries particularly in those used in the automobile industry. With growing demands for high energy supply for practical applications, Ni -rich cathodes have become a popular option due to their high theoretical capacity; …
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Integration of composite nanomaterials into anode and cathode designs
… Additionally, this research introduces new cathodes designs based on buckeye and toray papers for air-breathing and liquid electrolyte modes. Buckeye and 0.11mm-thick toray papers are used to design the air-breathing cathode by immobilization of Laccase using a non-covalent linking agent. …
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Hollow cathode sputtering system - installation, operation and theoretical background
… was to assemble, install and operate a hollow cathode sputtering system (HCSS). Therefore a complex vacuum system was built to create the right sputtering environment. The purpose of the HCSS is to develop advanced thin conducting oxides (TCOs) as well as high resistivity transparent (HRT) …
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Electrochemically-induced phase transition in olivine type cathode materials
Phase transitions are commonly observed in ion storage compounds when being used in rechargeable batteries and thus, the phase behavior of ion storage compounds as electrode active materials has significant impact on battery performance. This thesis aims to understand the interplay between …
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Optimization of Fasp for Li-Ion Cathode Material Production
… of creating the materials for lithium-ion cathodes, more specifically the NCM-811 variation of the lithium-ion batteries. This study aims to identify key factors in improving the powder production of the FASP system. One way it aims to do this is by creating a CFD simulation, within ANSYS, …
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Ab-initio study of cathode materials for lithium batteries
Using first principles calculations the effect of electronic structure on the stability of positive electrode materials for lithium rechargeable batteries is investigated. The investigation focuses upon lithiated α-NaFeO₂ type 3d transition metal oxide structures. It is found that the ligand field …
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