Literatura académica sobre el tema "Accumulateurs lithium-Ions"
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Artículos de revistas sobre el tema "Accumulateurs lithium-Ions"
Shlimas, Dmitriy I., Daryn B. Borgekov, Kayrat K. Kadyrzhanov, Artem L. Kozlovskiy y Maxim V. Zdorovets. "Study of the Surface-Layer Softening Effects in xLi2ZrO3–(1−x)Li4SiO4 Ceramics under Irradiation with He2+ Ions". Ceramics 7, n.º 2 (16 de abril de 2024): 547–61. http://dx.doi.org/10.3390/ceramics7020036.
Texto completoHughes, P. J. y A. H. Drummond. "Formation of inositol phosphate isomers in GH3 pituitary tumour cells stimulated with thyrotropin-releasing hormone. Acute effects of lithium ions". Biochemical Journal 248, n.º 2 (1 de diciembre de 1987): 463–70. http://dx.doi.org/10.1042/bj2480463.
Texto completoCygan, Randall T., Henry R. Westrich y Daniel H. Doughty. "Molecular Dynamics Study of Lithium Diffusion in Lithium-Manganese Spinel Cathode Materials". MRS Proceedings 496 (1997). http://dx.doi.org/10.1557/proc-496-109.
Texto completoBi, Chen‐Xi, Yu‐Jie Zhu, Zheng Li, Meng Zhao, Xue‐Qiang Zhang, Bo‐Quan Li y Jia‐Qi Huang. "Evolution of Lithium Metal Anode Along Cycling in Working Lithium–Sulfur Batteries". Advanced Energy Materials, 18 de julio de 2024. http://dx.doi.org/10.1002/aenm.202402609.
Texto completoTesis sobre el tema "Accumulateurs lithium-Ions"
Sandu, Izabela. "Nouveaux matériaux d'électrode négative pour batteries à ions lithium". Nantes, 2003. http://www.theses.fr/2003NANT2073.
Texto completoSafari, Mohammadhosein. "Vieillissement des batteries à ions lithium : étude expérimentale et modélisation". Amiens, 2011. http://www.theses.fr/2011AMIE0106.
Texto completoThe focus of this dissertation is on aging and life prediction of lithium-ion batteries under different modes of operation. To this end, two different approaches are demonstrated in this thesis: the application of an empirical methodology derived from concepts used in mechanical fatigue and analysis of experimental aging data assisted by physics-based simulation. In a physics-based model, the behavior of the cell is described using a set of relevant governing equations. The cell performance can readily be simulated under different modes of operation and moreover, the explicit inclusion of aging phenomena in the set of governing equations might be used to simulate the performance fade of the cell. An originality of our work is to evaluate the prediction capability of the empirical approach using such a physics-based model of a graphite/LiCoO2 cell experiencing a single source of aging [i. E. , the growth of a solid electrolyte interphase (SEI) at the graphite electrode] as a dummy battery. We show that the empirical Palmgren-Miner rule (PM), well-known in the field of mechanical fatigue, is a valid and accurate damage-accumulation law for our case study. Additionally, we propose and validate another relationship for the loss accumulation over time. We demonstrate that the two developed methodologies can successfully predict the life of the cell under a given complex current profile with slightly better prediction ability for the case of the PM rule. The power of simulation-based analysis in aging study of Li-ion batteries is demonstrated for analyzing experimental aging data of a commercial graphite/LiFePO4 cell. Performance decay of this cell during either open-circuit-potential storage or under cycling conditions at 25 and 45°C during one year is monitored by non-destructive electrochemical techniques and is analyzed with the aid of post-mortem analyses and simulations of the cell performance over the course of aging. Data analysis reveals that the aging manifests itself more in terms of capacity loss rather than in terms of impedance increase, regardless of cycling or storage conditions and of temperature. The capacity fade is larger at 45 than at 25°C, regardless of cycling or storage conditions, and at a same temperature, cycling conditions are always more detrimental to capacity fade than storage conditions. An in-depth understanding of capacity-loss mechanism under both storage and cycling conditions is gained by refining some parameters of a mathematical model of the cell at different extents of aging. To do so, first, a simple while accurate model of the cell (without aging) is developed and validated that is able to properly account for the experimental charge/discharge (from C/10 to 1C) and path-dependence effects of the cell. In this model, the LiFePO4 electrode is treated based on a resistive-reactant concept with multiple particles whereas a single-particle approach is used to model the graphite electrode. The simulation-based analysis of the aging data reveals that the capacity fade during cell storage only results from the loss of cyclable lithium because of side reactions whereas the loss of graphite active material is an additional source of aging for the cells under cycling conditions. A simple kinetic analysis of electrode/electrolyte interactions is provided for the cells under storage conditions. Moreover, the growth of SEI at the graphite electrode under storage conditions is simulated in order to refine the solvent-reduction kinetic parameters and solvent diffusion coefficient in the SEI layer. From the analysis, it is shown that the SEI growth during storage is under mixed kinetic/diffusion control
Recham, Nadir. "Synthèse, structure et propriétés électrochimiques de nouveaux matériaux pour batteries à ions lithium". Amiens, 2010. http://www.theses.fr/2010AMIE0111.
Texto completoThe subject of this thesis is the preparation of new electrode materials for Li ion batteries via eco-efficient syntheses processes. It first reports the making of LiFePO4 powders according to a new synthesis process using latent bases; this process is later generalized to the preparation of other electrode materials such as LiMPO4 (M=Mn, Ni, Co), Li2FeSiO4 or Na2MnPO4F. These materials are then prepared via a new specific synthesis strategy centered on the use of ionic liquids. This is an ionothermal synthesis, hardly explored in inorganic chemistry until now. This new synthesis method, due to its dual role of solvent and structuring agent of the ionic liquid, enabled us to not only prepare powders with controlled morphology and texture from already known materials, but also to discover a new class of insertion compounds namely the family of fluorosulfates LiMSO4F. One of them, LiFeSO4F, has a potential of 3. 6V vs. Li, a capacity of 151mAh/g and a good ionic conductivity, and is a direct opponent to LiFePO4 which is today the most praised electrode material. Although less interesting from an electronic point of view, the ionothermal approach has been generalized to the formation of AMSO4F (A=Li, Na, M=Mn, Co and Ni) compounds, never reported until now. The last point of this thesis is the synthesis of new boron complexes able to solubilize fluorides with high reticular energy (LiF, NaF), or to act as a fluoride carrier in order to obtain, via an exchange reaction, the lamellar compound FeOF, which was only known in its rutile form until now
Dulac, Anne-Marie. "Matériaux d'électrode positive à haut potentiel pour batteries à ions lithium". Nantes, 2002. http://www.theses.fr/2002NANT2103.
Texto completoLecoeur, Cyrille. "Élaboration de collecteurs de courant structurés en aluminium pour accumulateurs à ions lithium par synthèses électrochimiques en milieux liquides ioniques". Amiens, 2011. http://www.theses.fr/2011AMIE0109.
Texto completoThe initial goal of this research project was to realize structured current collectors, through electrochemical methods in ionic liquid media, in order to improve the performance of the positive electrode in lithium ion batteries. We have determined the composition of mixtures made of 1-ethyl-3-methylimidazolium chloride/aluminium chloride ([EMIm]Cl/AlCl3) and 1-alkyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide/aluminium chloride (['X'MIm]TFSI/AlCl3 with ‘X’ = -C2H5, n-C8H17, n-C16H33) for different aluminium salt contents, respectively. Whatever the electrochemical bath used, the electroactive phase is mainly composed of the organic cation ['X'MIm]+ and Al2Cl7 - anion, which is reducible in metallic aluminium. By three different methods, we managed to get three distinct Al morphologies. Structured aluminium deposits showing ball morphology were obtained using the pulsed current deposition method. Modulation in term of size particles is possible according to the nature of ionic liquids ['X'MIm]TFSI. By potentiostatic deposition from [EMIm]TFSI/AlCl3 bath, columnar current collectors were prepared thanks to the addition of a cationic surfactant, cetyltrimethylammonium bromide (CTAB), which plays a role of "soft-template". Finally, we showed that it was possible to obtain textured current collectors using a method of oxidation by cyclic voltametries. Electrochemical tests showed significant improvements in the capacity delivered by the LiFePO4 active material at high rate. Compared to a 1 mm thick flat aluminium substrate, an optimized aluminium ball size, as our columnar deposit, can go from 0% to about 80% of the initial capacity for a rate of 20C. Our textured current collector, consisting of nano-needles, allows an improvement of 62% for the same high rate
Naudin, Coralie. "Étude par spectroscopies infrarouge et Raman des composants d'un accumulateur lithium-métal polymère". Bordeaux 1, 2002. http://www.theses.fr/2002BOR12579.
Texto completoSaint, Juliette. "Matériaux d'électrode négative pour accumulateurs à ions lithium : étude des systèmes binaires Li-Ga et Li-B et des composites silicium-carbone". Amiens, 2005. http://www.theses.fr/2005AMIE0530.
Texto completoFantin, Roberto. "Etude des matériaux d'électrode positive pour accumulateurs lithium-ions par spectroscopie de photoémission à rayonnement X mous et durs expérimentale et théorique". Electronic Thesis or Diss., Université Grenoble Alpes, 2024. http://www.theses.fr/2024GRALI027.
Texto completoThis thesis has the objective to understand the redox compensation mechanism of positive electrode materials sustaining lithium-ion battery (dis-)charge processes. The study is conducted for LiNiO2, Li2MnO3, and LiCoO2, archetype materials for the state-of-art high-energy positive electrode materials Li[NixMnyCoz]O2. Despite these materials having been studied for decades, the link between electronic correlations and redox mechanism during (de-)lithiation is not well understood. In particular, the role of transition metals and oxygen ions in the redox process is yet to be clarified and resolved in-depth from the surface towards the bulk.To this goal, we establish a novel methodology based on laboratory- and synchrotron-based soft and hard X-ray photoemission spectroscopy (XPS, HAXPES) to probe qualitatively and quantitatively the electronic structure from the extreme surface down to ~20-30 nm. This allows us to follow the evolution of positive solid electrode-electrolyte interphase, surface electrode material degradation, and bulk electronic structure upon cycling. Notably, the thickness and chemical structure of the surface degradation layer depends on the increase of oxygen valence, related to its interaction with the transition metal. Subsequently, we investigate the evolution of the bulk electronic structure upon cycling by analyzing the transition metal 2p core-level HAXPES spectra with electronic structure simulations based on density functional (DFT) and cluster model (CMT) theories. We evaluate the role of transition metals and oxygen in the redox process by quantifying the 3d-3d Coulomb repulsion and oxygen ligand-metal 2p-3d charge transfer (Δ). The spectra analysis for LiCoO2 and LiNiO2 highlights a decrease of Δ towards the negative charge transfer regime indicating a leading role of the oxygen ions in the charge compensation mechanism. The delithiation process is therefore controlled by the local electron transfer from oxygen 2p orbitals to limit charge accumulation in the metal 3d orbitals
Donval, Gaël. "Modélisation de spectres de perte d'énergie des électrons sur des matériaux d'électrode à base de silicium dans les accumulateurs aux ions lithium". Nantes, 2015. http://archive.bu.univ-nantes.fr/pollux/show.action?id=18deb5d1-aa83-406d-bc4b-84b9ff24ac2c.
Texto completoSilicon is a very promising negative electrode material for Li-ion batteries. Even so, it becomes amorphous during lithiation which makes it difficult to characterize by employing the usual experimental setups. In this thesis, we have chosen to take advantage of the electron energy-loss spectroscopy (eels) technique to study atomically-resolved structures and chemical compositions of interfaces which are generated at the lithiation front of bulk silicon. Yet eel spectrum interpretation remains challenging, especially when measured along an heterogeneous environment such as an interface. That is why we have focused our work on the theoretical study of interfaces in the electronic density functional theory (dft) framework. We have leveraged the Li-Si phase diagram and have developed efficient tools that were used, in association with ab initio molecular dynamics, to generate realistic lithiation-frontcentered lithiated interfaces. We have concurrently tested some of the most appropriate methods to calculate eel line-spectra on these systems. A semi-empirical model of plasmon energy has been obtained from all our data and we demonstrated its generalization to a whole domain of LixSi compositions
Azib, Tahar. "Elaboration de nanocomposites LiFePO₄/Polypyrrole comme matériau d'électrode positive pour batteries à ions lithium : rôle de la morphologie et de l'interface particules-polymère sur l'optimisation des performances électrochimiques". Paris 7, 2012. http://www.theses.fr/2012PA077189.
Texto completoLiFePO4 is one of the most promising cathode materials for lithium ion rechargeable batteries. It has a high theoretical specific capacity (170 mAh/g) and operating potential (3. 45 V vs. Li+/Li). Additionally, the material is extremely stable thermally and electrochemically at ambient conditions. However, its electronic and ionic conductivities must be still improved. In tis context, we produced almost highly crystallized LiFePO₄ nanoplatelets using the polyol process. Structural, microstructural and electrochemical analyses established the key role of the crystral coherence lengh along the b axis of the olivine structure. It cannot be reduced to less than some tens of nanometers if one desires to boost the ionic conductivity of this material. We also tentatively prepared c/LiFePO4 nanocomposites, using the previously synthesized particles and those obtained by hydrothermal route exhibiting larger sizes (submicrometer range). Polypyrrole (PPy) is a conductive polymer. PPy particles coating was achieved by chemical oxidative polymerization of pyrrole (Py) monomer in an aqueous suspension of LiFePO4 particles, varying the synthesis conditions, including the nominal Py/LiFePO4 weight ratio. Advanced structural and microstructural analyses of the produced composites evidenced a severe chemical delithiation, making them non valuable for the desired application. To overcome this drawback, we successfully grafted pyrrole modified arryl groups to the surface of the nano- and submicrometer-sized LiFePO4 particles using diazonium salts chemistry. Weakly PPy-weighted composites (2. 5 wt. -%), exhibiting relatively high electronic conductivity, were then synthesized starting from these hybrids, opening thus real opportunities for the desired application