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 120 for “"Cathode Materials"”.
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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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Aerosol Synthesis Of Cathode Materials For Li-Ion Batteries
… renewable energy storage system. Advancements in materials are believed to be essential to meet the growing demand of high-performance materials for Li-ion batteries, as well as to bring down the battery cost: material cost) to a reasonable level. In the past decade, the primary focus in the …
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Electrochemically-induced phase transition in olivine type cathode materials
… of ion storage compounds as electrode active materials has significant impact on battery performance. This thesis aims to understand the interplay between materials structure, phase behavior and battery performance. The effects of operating conditions, especially overpotential and temperature, …
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Ab-initio study of cathode materials for lithium batteries
… 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 stabilization energy (LFSE) is of particular importance in …
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Optimization of layered battery cathode materials synthesized via spray pyrolysis
… techniques for the synthesis of Li-ion battery materials are critically needed to address the requirement of a clean and efficient transportation sector. The current research serves this goal by developing an approach to producing layered cathode materials with superior electrochemical …
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Studies of Sulfur-based Cathode Materials for Rechargeable Lithium Batteries
Developing alternative cathodes with high capacity is critical for the next generation rechargeable batteries to meet the ever-increasing desires of global energy storage market. This thesis is focused on two sulfur-based cathode materials ranging from inorganic lithium sulfide to organotrisulfide. …
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Borate polyanion-based systems as Li- and Mg-ion cathode materials
… as high capacity and high voltage Li- and Mg-ion cathode materials. We explore the layered orthoborates (M3(BO3)2 which, to our knowledge, have not been previously considered as Li- or Mg-ion cathodes, perhaps due to the lack of Li analogues. Structural analysis shows that mixed metal orthoborates …
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Direct Lithium-ion Battery Recycling to Yield Battery Grade Cathode Materials
… oxides (NCM) are one of the most essential cathode materials for EV applications due to their long cycle life, high capacity, and low cost. In 2008, 18.9% of Lithium-ion batteries used NCM cathode material worldwide while this number increased to 31% six years later. An environment–friendly …
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Advanced Characterization for Studying Ni-rich Cathode Materials for Li-ion Batteries
… way to Zr bulk doping a Ni-rich layered cathode material upon two different pathways, during lithiation and co-precipitation step. High resolution x-ray diffraction and x-ray absorption spectroscopy measurements revealed, for the coprecipitation step, the absence of every Zr based …
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Developing new techniques to synthesize layered cathode materials for lithium-ion batteries
… used to synthesize batteries' active electrode materials. High surface area cathode materials with smaller nanoparticles are favored for their higher reactivity compared to materials with particles of larger size. Sol-gel and co-precipitation methods have been primarily adopted because they can …
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Surface phase emergence and evolution of solid oxide fuel cell cathode materials
… oxygen reduction reaction (ORR) that occurs at cathode surface. This research involves the study of changes in the surface composition and structure at the surface of the cathode, since these changes can directly influence the ORR. Idealized single crystals of cathode materials La0.8Sr0.2MnO3 …
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Nanoscale defect engineering and mapping for cathode materials of multivalent ion batteries
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2027-08-01
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Investigation of polymers used in lithium oxygen batteries as electrolyte and cathode materials
… been well established that the electrolytes and cathodes have a significant effect on the electrochemical performance of lithium oxygen batteries. In this Master project, polymers were employed as electrolyte and cathode materials due to their unique superior properties. Using different methods, …
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Evaluation of Cathode Materials for Low Temperature (500-700C) Solid Oxide Fuel Cells
… into state of the art Ba- and La- based cathode materials for use in low temperature (500-700°C) solid oxide fuel cells.</p> <p>Synthesis of A-site deficient [A=0.97] Ba<sub>0.5</sub>Sr<sub>0.5</sub>Co<sub>0.8</sub>Fe<sub>0.2</sub>O<sub>3</sub> (BSCF) was accomplished by the EDTA-citrate …
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Microstructural Investigations of the Layered Cathode Materials LiCoO2 and LiNi1/3Mn1/3Co1/3O2
Both LiCoO2 and LiNi1/3Mn1/3Co1/3O2 layered cathode materials are investigated in our studies. P3 phase of CoO2, the end member of the LixCoO2, is found in both chemically and electrochemically delithiated materials. Delithiated LixCoO2 specimens decompose into fine Co3O4 and LiCoO2 particles …
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A first principles investigation of transitional metal doping in lithium battery cathode materials
… transition-metal oxides for lithium battery cathode materials was investigated. The effect of doping on the phase separation tendencies of layered transition-metal oxides was examined and it was found that for normal processing temperatures, Al is miscible in layered transition metal oxides …
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