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Showing 1 to 20 of 40 for “"LiFePO4"”.
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Mesoporous materials and nanostructured LiFePO4 as cathodes for secondary Li-ion batteries: synthesis and characterisation
… materials and nano-structured phospho-olivine LiFePO4 as cathode materials for Li-ion cells. In Chapter IV the characterization techniques and methods used to analyse the synthesized samples, either from the structural-morphological or electrochemical point of view, are briefly described. In …
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Síntesis hidrotermal de micro y nanopartículas de lifepo4 para la fabricación de baterías de ion litio
… síntesis hidrotermal de nano-micropartículas de LiFePO4, objeto de la presente tesis doctoral. Actualmente, el LiFePO4 es el material catódico más empleado en las baterías de ion litio comercializadas, principalmente por sus fantásticas prestaciones, como alta capacidad teórica (170 mA·h·g-1), …
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Nanostrucured Lithium Iron Phosphate As Cathode Material For Lithium Ion-Batteries
… Of particular interest is the olivine-structured LiFePO4 cathode developed by Goodenough and co-workers, which offers several appealing features, such as a high, flat voltage profile and relatively high theoretical specific capacity (170 mAhg−1), combined with low cost and low toxicity. However, the …
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Enhancement In Electrochemical Performance Of Advanced Battery Electrodes Using Carbon- Nanomaterial Composites
<p>LiFePO4 has attracted great interest as a cathode material for lithium ion batteries due to its reasonably high theoretical capacity (170mAh/g), thermal stability, high Li ion reversibility and low cost. However, prohibitively low electronic conductivity (~10-9 S/cm) of LiFePO4 leads to high …
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Thermodynamische Untersuchungen an orthorhombischem Lithiumeisen(II)-phosphat und Eisen(III)-phosphat
… der mittleren molaren Mischungsenthalpie von LiFePO4 und FePO4 wurde die Methode der isothermen Titrationskalorimetrie für die Untersuchung heterogener Stoffsysteme optimiert. Die Ergebnisse konnten mit elektrochemischen Gleichgewichtszellspannungsmessungen validiert werden. Ferner wurde die …
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Novel lithium iron phosphate materials for lithium-ion batteries
… presents a major progress in the development of LiFePO4 as a cathode material for lithium-ion batteries. Using simple procedure, a completely novel morphology has been synthesized (mesocrystals of LiFePO4) and excellent electrochemical behavior was recorded (nanostructured LiFePO4). The newly …
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Phase behavior and phase transformation kinetics during electrochemical cycling of lithium transition metal olivine compounds
… for Fe, Mn, Co, and Ni. Among these, LiFePO4 has received the most attention for its likelihood to provide low price, good cycling stability, thermal stability, and low-toxicity. It is being utilized in a new generation of Li-ion batteries for high power applications such as power …
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Doped LiFePO₄ cathodes for high power density lithium ion batteries
Olivine LiFePO4 has received much attention recently as a promising storage compound for cathodes in lithium ion batteries. It has an energy density similar to that of LiCoO 2, the current industry standard for cathode materials in lithium ion batteries, but with a lower raw materials cost and an …
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The effect of temperature on phase transformation mechanisms in electrodes for Li-ion batteries
… to study two important cathode materials: LiFePO4 and V6O13. This allows unprecedented insights into the structural changes and its influence on electrochemical performance at variable temperatures (VTs). LiFePO4 was investigated for various battery cycling rates and temperatures. …
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Mixed (ion and electron) conducting polymers, with applications in batteries
… found to be an effective separator between a 3D LiFePO4 positive electrode and a liquid lithium amalgam negative, and the chemically prepared materials showed a capacity of around 150 mAh per gram LiFePO4 in a conventional Li/LiFePO4 cell,. These experiments demonstrate a proof of concept for the …
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A multi-functional electrolyte for lithium-ion batteries
… full cell cycling with lithium iron phosphate (LiFePO4), lithium titanate oxide (Li4Ti5O12), and copper antimonide (Cu2Sb), and impedance spectroscopy measurements. The results show that the MFE containing HFE-7000 has comparable stability and cycling performance to a conventional lithium-ion …
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Bateriová oblouková svářečka
… akumulátoru. Články akumulátoru jsou typu LiFePO4, které jsou schopné dodávat vysoké proudy i při relativně malé kapacitě. K akumulátoru jsou též navrženy a zkonstruovány BMS obvody. Hlavní výkonovou částí svářečky je snižující DC/DC měnič se synchronně spínanými dolními tranzistory na …
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Synthesis and microstructural characterization of phosphate cathode materials prepared by a polymeric steric entrapment precursor route
… work, a nanoscale and pure olivine structure LiFePO4 (triphylite) was synthesized at low temperature (since 300 ºC) using an organic–inorganic steric entrapment solution, from precursor chemicals of LiNO3, Fe(NO3)3•9H2O and (NH4)2HPO4 stoichiometrically dissolved in distilled water. A …
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Operando investigations of mechanical changes in lithium-ion batteries
… mechanical changes in lithium iron phosphate (LiFePO4) cathodes during cyclic voltammetry in LiPF6 and LiClO4-containing electrolytes. Analysis of the stress and strain derivatives in LiClO4–containing electrolytes both exhibit single peaks during lithiation and delithiation that coincide with …
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Advances in Lithium Ion Batteries Obviate Need for Ultracapacitors in Electric Vehicles
… are varied to observe the effects of new (A123 LiFePO4) and old (Sony LiCoO2) battery technologies in these topologies. A sixty percent reduction in the peak power delivery from the ultracapacitor in the passive hybrid (no DC/DC Converter) using the newer technology battery model is observed. …
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Printable lithium batteries
Printable lithium iron phosphate (LiFePO4) cathodes and porous aerogel / polymer separators have been designed, constructed, and tested. The cathodes consist of LiFePO4, PVDF binder, and conductive carbon which was developed for robocast deposition (printing) onto carbon coated aluminum substrates …
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Ab initio thermodynamics of phase-separating and cation-disordered cathodes for Li-ion batteries
… cation-disordered rocksalts and high-rate LiFePO4 In the first part of this thesis (Chapters 3 and 4), we provide the first voltage-based design rules for high-capacity cation-disordered rocksalts. We demonstrate that, depending on the transition metal species, cation disorder can increase …
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Ab initio screening of lithium diffusion rates in transition metal oxide cathodes for lithium ion batteries
… are screened using this approach: [beta]'-LiFePO4, hexagonal LiMnBO3, monoclinic LiMnBO3, Li 3Mn(CO3)(PO4), and Li9V3 (P2O7)3(PO4) 2. The activation barriers for the materials are determined using a combined approach. First, an empirical potential model is used to identify the lithium …
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Investigations of rate limitation in nanostructured composite electrodes and experiments towards a 3D Li-ion microbattery
… effecting discharge rate limitation within LiFePO4 composite electrode structures have been investigated. It was found that for composite electrodes containing ‘small particles’ of active material solid state processes are not necessarily rate limiting. A simple model has been developed to …
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Intercalation dynamics in lithium-ion batteries
… highly anisotropic materials such as LiFePO4, this model predicts phase-transformation waves between the lithiated and unlithiated portions of a crystal. This work extends the analysis of the wave dynamics, and describes a new mechanism for current capacity fade through the …
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