A5042091360- Advancements in Battery Materials
- Advanced Battery Materials and Technologies
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Advanced Battery Technologies Research
- Extraction and Separation Processes
- Supercapacitor Materials and Fabrication
- Chalcogenide Semiconductor Thin Films
- Semiconductor materials and interfaces
- Microwave Engineering and Waveguides
- Gyrotron and Vacuum Electronics Research
- Magnetic and transport properties of perovskites and related materials
- Magnetic Properties and Synthesis of Ferrites
- Crystal Structures and Properties
- Particle accelerators and beam dynamics
- Transition Metal Oxide Nanomaterials
- Layered Double Hydroxides Synthesis and Applications
- Electromagnetic Simulation and Numerical Methods
- Solid-state spectroscopy and crystallography
- Advanced battery technologies research
- Advanced Thermoelectric Materials and Devices
- Phase-change materials and chalcogenides
- Electrochemical Analysis and Applications
- Chemical Synthesis and Characterization
- E-Learning and Knowledge Management
University of Córdoba
2014-2024
Centro Científico Tecnológico - Córdoba
2021
Software (Spain)
2009-2019
Qatar University
2017
Universitat de València
2013
Institut National Polytechnique Félix Houphouët-Boigny
2008
Université de Montpellier
1997-2007
Universitat Politècnica de València
2006
Centre National de la Recherche Scientifique
1997-2005
Technical University of Darmstadt
2005
Lithium has been inserted into the spinel Li4Ti5O12 by both chemical and electrochemical methods. The cation distribution in lithiated phases analyzed 6,7Li NMR, Raman spectroscopy, X-ray diffraction, chemically compound additionally neutron diffraction. A refinement of structural parameters carried out applying Rietveld method to diffraction pattern. It is shown that two insertion methods are based on different mechanisms. Chemically lithium ions trapped (48f) sites structure from which...
A new model is presented for the calculation of passive intermodulation (PIM) in waveguide connections. The considers roughness interconnecting surfaces and presence an insulator layer (oxide contaminants) on these metal surfaces. This results generation a contact resistance, which can excite PIM level. In particular, case metal-insulator-metal regions are source especially investigated. level response calculated different junction parameters like applied mechanical load, surface finish, or...
Orthorhombic cobalt oxalate dihydrate has been prepared in the form of nanoribbons by a reverse micelles method. The crystallographic structure resulting solid differs from monoclinic massive product. A careful dehydration nanocrystals leads to anhydrous which nanoribbon-shaped particles are preserved and Co2+ ions located centrosymmetric environment. CoC2O4 is used for first time as high-capacity lithium storage materials with improved rate performance. solids react lithium, leading...
A promising group of inorganic salts recently emerged for the negative electrode advanced lithium-ion batteries. Manganese carbonate combines low weight and significant lithium storage properties. Electron paramagnetic resonance (EPR) magnetic measurements are used to study environment manganese ions during cycling in test cells. To observe reversible into carbonate, preparation by a reverse micelles method is used. The resulting nanostructuration favors capacitive mechanism with good rate...
Calcium batteries could be an alternative to lithium analogues, but this technology is still in its infancy. It previously known that layered-type molybdite (α-MoO3) can intercalate hydrated calcium ions aqueous electrolyte, and intercalation process increases the interlayer spacing. In work, we have found α-MoO3 electrochemically active cell with nonaqueous electrolyte. The mechanism of has been explored by using XRD, Raman, XPS. layered structure preserved upon electrochemical unsolvated...
A cathode material with, to our knowledge, the highest discharge capacity (125 mAh/g) is reported. The phosphate obtained by using a novel solid-state synthesis procedure. basic idea of procedure use an alternative cobalt-containing precursor and lithium excess with carbon black as temporal dispersing agent, later eliminated addition produces lower average particle size than conventional preparations, yielding finely dispersed solid. low responsible for better electrochemical behavior....
Mesoporous FeC 2O 4 was prepared by dehydration of bulk monoclinic- and micellar orthorhombic 4.2H precursors at 200 degrees C. The material shows nanoribbon shaped particles, which are preserved after dehydration. These solids used as high-capacity lithium storage materials with improved rate performance. mesoporous nanoribbons exhibit higher capacities close to 700 mA h/g 50 cycles 2C (C = 1 Li h (-1) mol (-1)) between 0 2 V.
Different solid solutions in the FexCo1−xC2O4·2H2O system have been prepared form of nanoribbons by a reverse micelles method. The orthorhombic crystallographic structure differs from monoclinic massive products FeC2O4·2H2O and CoC2O4·2H2O. dehydration process is studied thermal analysis to prepare anhydrous solution oxysalts, which nanoribbon-shaped particles are preserved porous developed. Anhydrous mixed oxalates used for first time as high-capacity lithium storage materials with improved...
The feasibility of cubic Mg2MnO4 (c-Mg2MnO4) cathode for rechargeable magnesium batteries is scrutinized by both theoretical and experimental methods. To exploit the high valence state Mn4+ upon insertion in c-Mg2MnO4, we substituted Mn3+ (0.645 Å) larger Mg2+ (0.72 studied a series Mg1+yMn3+2-2yMn4+yO4. results prove that this Mg/Mn substitution progressive increase unit cell parameter "a" due to increasement average oxidation Mn. We also distinguish importance having Mn(IV) c-Mg2MnO4 vs....
Magnesium driven reaction in olivine-type MgMn0.5 Zn0.5 SiO4 structure is subject of study by experimental tests and density functional theory (DFT) calculations. The partial replacement Mn Oh sites other divalent metal such as Zn to get cathode successfully developed a simple sol-gel method. Its comparison with the well-known MgMnSiO4 (Mg)M1 (Mn)M2 cations distribution serves basis this understand structure, magnesium extraction/insertion properties novel (Mn0.5 )M2 composition. This work...
Highly Al-substituted C-coated Na3V2-xAlx(PO4)3 compounds with a sodium superionic conductor structure are synthesized by single and easily scalable sol-gel route. The effect of the experimental conditions is examined. Their structural, chemical, morphological features described. first-principles method used to determine theoretical voltage vs Na content profile during extraction. electrochemical extraction characterized presence two plateaus. first one at ca. 3.4 V assigned V4+/V3+ redox...
First studies of the ternary system SnSe-Bi(2)Se(3) developed in 1960s and 1970s have revealed existence a nonstoichiometric trigonal phase with wide range compositions. In this study, an almost stoichiometric phase, corresponding to composition SnBi(4)Se(7), has been identified isolated. The structure determined by X-ray diffraction local environment Sn atoms analyzed Mössbauer spectroscopy. This rhombohedral structure, space group R&thremacr;m, hexagonal lattice parameters = 4.1602(5) Å c...
With a view to the possible application of tin phosphide as negative electrode in advanced lithium-ion battery test cells, and magic angle spinning nuclear magnetic resonance Mössbauer spectroscopy techniques were used reveal mechanism electrochemical reactions lithium cells. The formation Sn through conversion reaction was observed. This process followed by successive intermetallics up stoichiometry. Reversibility restricted lithium–tin thus limiting maximum allowed reversible capacity.