Synthesis and Electrochemical Studies of Cobalt Substituted Nickel Hydroxide for Battery Applications

Synthesis and Electrochemical Studies of Cobalt Substituted Nickel Hydroxide for Battery Applications
Author: Iman Yazdi
Publisher:
Total Pages: 134
Release: 1999
Genre:
ISBN:

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Homogeneous precipitation by urea decomposition has been shown to form powders of superior performance for use as the positive electrode of rechargeable batteries. Cobalt substituted [Alpha]-Ni(OH)2 powders prepared by this method have produced micron sized spherical particles with an inner structure of nanosized sheet-like crystallites, which demonstrate a very high specific surface area for the powder. Comparative electrochemical studies and phase analyses between homogeneously precipitated, commercial, and base precipitated Ni(OH)2 powders have shown that homogeneously precipitated powders, with or without cobalt, have the highest capacity and best reversibility characteristics. The effects of coprecipitation of cobalt versus mechanical mixing were studied. Results show that even though any type of cobalt addition will improve the capacity and reversible potential of the electrode, regardless of the preparation method, the most dramatic enhancement is seen with the substitution of cobalt for nickel within the structure.

Microscopy Applied to Materials Sciences and Life Sciences

Microscopy Applied to Materials Sciences and Life Sciences
Author: Ajay Vasudeo Rane
Publisher: CRC Press
Total Pages: 502
Release: 2018-11-21
Genre: Science
ISBN: 1351251570

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This new volume, Microscopy Applied to Materials Sciences and Life Sciences. focuses on recent theoretical and practical advances in polymers and their blends, composites, and nanocompos¬ites related to their microscopic characterization. It highlights recent accomplishments and trends in the field of polymer nanocomposites and filled polymers related to microstructural characterization. This book gives an insight and better understanding into the development in microscopy as a tool for characterization. The book emphasizes recent research work in the field of microscopy in life sciences and materials sciences mainly related to its synthesis, characterizations, and applications. The book explains the application of microscopic techniques in life sciences and materials sciences, and their applications and state of current research carried out. The book aims to foster a better understanding of the properties of polymer composites by describing new techniques to measure microstructure property relationships and by utilizing techniques and expertise developed in the conventional filled polymer composites. Characterization techniques, particularly microstructural characterization, have proven to be extremely difficult because of the range of length-scales associated with these materials. Topics include: •Instrumentation and Techniques: advances in scanning probe microscopy, SEM, TEM, OM. 3D imaging and tomography, electron diffraction techniques and analytical microscopy, advances in sample preparation techniques in-situ microscopy, correlative microscopy in life and material sciences, low voltage electron microscopy. •Life Sciences: Structure and imaging of biomolecules, live cell imaging, neurobiology, organelles and cellular dynamics, multi-disciplinary approaches for medical and biological sciences, microscopic application in plants, microorganism and environmental science, super resolution microscopy in biological sciences. •Materials Sciences: materials for nanotechnology, metals alloys and inter-metallic, ceramics, composites, minerals and microscopy in cultural heritage, thin films, coatings, surfaces and interfaces, carbon based materials, polymers and soft materials and self-assembled materials, semiconductors and magnetic materials. Polymers and inorganic nanoparticles. The volume will be of significant interest to scientists working on the basic issues surrounding polymers, nanocomposites, and nanoparticulate-filled polymers, as well as those working in industry on applied problems, such as processing. Because of the multidisciplinary nature of this research, the book will be valuable to chemists, materials scientists, physicists, chemical engineers, and processing specialists who are involved and interested in the future frontiers of blends.

Synthesis and Modification of High-Nickel Cathode Materials for Next Generation Lithium Ion Batteries

Synthesis and Modification of High-Nickel Cathode Materials for Next Generation Lithium Ion Batteries
Author: Au Nguyen
Publisher:
Total Pages: 0
Release: 2023
Genre:
ISBN:

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The limited worldwide Cobalt resource has spurred demand for new cathode materials with reduced Cobalt reliance. Substituting Cobalt with Nickel giving high-Nickel cathode material is a promising solution due to its high energy density and cheaper price. However, the poor cycling stability of high-nickel cathode materials is the major challenge that hinders their widespread adoption in electric vehicles and other energy storage applications. This work reports a significant advance in the development of high-nickel cathode materials with improved cycling stability. Firstly, a scalable synthesis route is developed to produce high-nickel cathodes with favorable morphology and high nickel content of 92%. Various low-cost doping elements including Mg, Al and Ti are screened to improve the structure of high-nickel cathodes during cycling. A Dual Protective strategy with AlPO4 nanoparticles as a representative is introduced as a low cost and effective approach to prolong the cycle stability of high-nickel cathodes. Finally, single-crystalline high-nickel cathodes are synthesized, and their electrochemical performance is compared with polycrystalline cathodes. The synthesized high-nickel cathode materials exhibit excellent electrochemical performance and significantly improved cycling stability. This work demonstrates promising pathways towards the commercialization of high-nickel cathode materials for Lithium Ion Batteries.

Commencement

Commencement
Author: Iowa State University
Publisher:
Total Pages: 510
Release: 1998
Genre: Commencement ceremonies
ISBN:

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Synthesis and Study of Coordination Compounds of Cobalt, Copper, Palladium and Nickel with Polydentate Ligands Containing Sulfur

Synthesis and Study of Coordination Compounds of Cobalt, Copper, Palladium and Nickel with Polydentate Ligands Containing Sulfur
Author: Tatiana Straistari
Publisher:
Total Pages: 0
Release: 2016
Genre:
ISBN:

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This work focuses on the synthesis, the characterization and the catalytic evaluation in the reduction of protons into dihydrogen, of new complexes of Ni(II), Co(III), Cu(II) and Pd(II) based ligands Type thiosemicarbazone. The catalytically active species during the process of the proton reduction was studied by cyclic voltammetry and mechanisms were formulated on the basis quantum chemical calculation.The first chapter introduces the scientific context, the goals and the main objectives of this work. The second chapter concerns the synthesis and the characterization of the N2S2 ligands and their associated mononuclear complexes, Ni, Cu and Pd. The third chapter presents the synthesis and the characterization of binuclear Co and trinuclear Ni based on N2S2 ligand.Electrochemical studies of these complexes in DMF in the presence of a proton source (trifluoroacetic acid), allowed us to evaluate their catalytic efficiency. Our results show that Cu and Pd complexes have a specific irreversible wave for the reduction of protons, but decomposition is observed during electrolysis, which makes these uninteresting complexes for the reduction of protons.On the contrary, Ni and Co complexes showed an electrochemical stability and good catalytic performances. In particular, the new mononuclear Ni complex exhibits remarkable catalytic properties that rank it among the best catalysts for the reduction of protons reported in the literature. All this work provided a complete description of the electrochemical behavior of N2S2 thiosemicarbazone ligands complexed to transition metals. It allows considering future developments in improving the catalytic properties of these complexes.