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See detailResorcinol-Formaldehyde Carbon Xerogels as Anode Material for Lithium-Ion Battery: Synthesis, Grinding and Coating on Current Collector
Piedboeuf, Marie-Laure ULg; Léonard, Alexandre ULg; Pirard, Jean-Paul ULg et al

Poster (2013, September 24)

Rechargeable lithium-ion batteries show great advantages over traditional batteries and are extensively used for consumer electronic devices due to their high energy density and long cycle life. However ... [more ▼]

Rechargeable lithium-ion batteries show great advantages over traditional batteries and are extensively used for consumer electronic devices due to their high energy density and long cycle life. However, the improvement of performance of current lithium-ion batteries requires the optimization of the materials used (electrolyte and electrodes). Therefore, tremendous efforts have been dedicated to exploring new materials with high capacity, excellent cycling performance, low cost and high safety features [1-3]. As an example, carbon xerogels are promising candidates in the development of new high performance C-based anode materials for Li-ion batteries, since such carbonaceous materials show very small changes of volume during the charge/discharge process, providing a long cycle life. Nevertheless, hard carbons also exhibit quite high irreversible capacity losses due to their intrinsic high microporosity [4]. To overcome these disadvantages, the structural and textural characteristics need to be carefully controlled. Also, due to the different morphology of these materials compared to graphite, the deposition of carbon xerogels on current collectors needs to be studied in detail. In this work, porous carbon xerogels have been synthesized from Resorcinol-Formaldehyde mixtures by adjusting the pH of the solution in order to obtain different mesopore sizes. Monoliths of carbon xerogels are obtained after drying of the polymer gel and pyrolysis [5]. These monoliths have been ground by two different methods and particle size distributions were measured by granulometry. Mercury intrusion porosimetry and nitrogen adsorption techniques (BET) have been used to characterize the pore texture of the monolithic and the powder materials. Different conditions have been used for the mixing of carbon xerogels with a binder and a solvent to form slurries. The latter have been cast on a copper foil using bar coating with different openings. After evaporation of the solvent, the resulting coatings were analyzed using scanning electron microscopy (SEM) for the morphology and their thickness was monitored by profilometry. First results indicate that the method of grinding has no influence on the final particle size distribution of the powder. The structural features of the carbon xerogels is well preserved for particles down to one micrometer. Nevertheless, a study of grinding duration shows that additional particles with sizes close to that of the porosity of the carbon appear. As a consequence, the grinding conditions were chosen so as to obtain a compromise between particles small enough to realize a coating on a current collector and particles large enough to maintain the carbon gel structural characteristics. References 1) Goodenough J.B., Kim Y. J. Power Sources 2011; 196(16): 6688-6694. 2) Bruce P.G. Solid State Ionics 2008; 179: 752-760. 3) Cairns A. J., Albertus P. Ann. Rev. Chem. Biomol. Eng. 2010; 1: 299-320. 4) Tran T., Yebka B., Song X., Nazri G., Kinoshita K., Curtis D. J. Power Sources 2000; 85: 269-278. 5) Job N., Théry A., Pirard R., Marien J., Kocon L., Rouzaud J., Béguin F., Pirard J. Carbon 2005; 43: 2481-2494. [less ▲]

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See detailXérogels de carbone à base de résorcinol-formaldéhyde en tant que matériaux d’anode pour batterie Li-ion; Synthèse et broyage avec contrôle de la granulométrie
Piedboeuf, Marie-Laure ULg; Léonard, Alexandre ULg; Pirard, Jean-Paul ULg et al

Conference (2013, May)

Xérogels de carbone à base de résorcinol-formaldéhyde en tant que matériaux d’anode pour batteries Li-ion : synthèse et broyage avec contrôle de la granulométrie Les xérogels de carbone sont des candidats ... [more ▼]

Xérogels de carbone à base de résorcinol-formaldéhyde en tant que matériaux d’anode pour batteries Li-ion : synthèse et broyage avec contrôle de la granulométrie Les xérogels de carbone sont des candidats prometteurs en tant que matériaux d’anodes de batterie Li-ion étant donné que leur faible variation de volume lors des cycles de charge-décharge devrait conduire à une durée de vie plus élevée. Néanmoins, du fait de leur morphologie fort différente de celle du graphite, tout un travail de mise au point du dépôt sur collecteur de courant se doit d’être effectué. Une partie de cette étude consiste à contrôler la granulométrie des particules issues du processus de broyage préalable à la préparation d’une encre. Dans ce travail, quatre xérogels de carbone de textures différentes ont été synthétisés et deux méthodes de broyage ont été utilisées pour réduire la taille des monolithes obtenus après synthèse. Les premiers résultats indiquent que la méthode de broyage n’a pas d’influence sur la distribution de la taille des particules et la structure des matériaux est bien conservée pour des particules de taille allant jusqu’au micromètre. [less ▲]

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See detailThe multiple SEA method: a method to synthesize Pt/carbon xerogel catalysts for Proton Exchange Membrane Fuel Cells (PEMFC)
Zubiaur, Anthony ULg; Chatenet, Marian; Maillard, Frédéric et al

Poster (2013, April)

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See detailEffect of current flow on bipolar plate/gas diffusion layer interfacial contact resistance in Proton Exchange Membrane fuel cells (PEMFC)
Stergiopoulos, Vaios ULg; Lafort, Adeline; Maseri, Fabrizio et al

in Proceedings of the Fundamentals and Development of Fuel cells 2013 conference (2013, April)

Stainless steel bipolar plates can be excellent alternative to graphite bipolar plates since they display better mechanical properties and the manufacturing procedure is easier and cheaper. However, they ... [more ▼]

Stainless steel bipolar plates can be excellent alternative to graphite bipolar plates since they display better mechanical properties and the manufacturing procedure is easier and cheaper. However, they are chemically instable in the corrosive environment of PEMFCs, and a thin oxide layer is developed on the plate’s surface. This layer causes a significant increase in the interfacial contact resistance (ICR) between the plates and gas diffusion layers. In an effort to characterize various stainless steel samples, before and after their exposure to the corrosive environment of a PEMFC, the interfacial contact resistance (ICR) between the plates and a commercial gas diffusion layer (GDL) was studied as a function of the pressure applied on the assembly. The ICR was studied in the range of 0-500 N/cm2 of pressure applied to the assembly; the ICR value was determined by means of galvanostatic potentiometry, where a constant current is applied to the assembly and the average value of the potential over time is recorded. The ICR is then calculated, after appropriate simplifications, as: ICR = Rtot = Iapplied / Vmonitored (1) It was observed that, besides the expected exponential reduction of ICR versus pressure, the value of the current applied to the assembly impacted greatly the obtained values for the ICR, irrespective of the applied pressure. This indicates that the observed phenomenon is not caused by any morphological changes on the interface. A possible explanation is that, at higher currents, the temperature increases locally due to ohmic heating, inducing thus changes in the GDL’s resistivity. [less ▲]

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See detailLa pile à combustible: du marché de niche au marché de masse
Job, Nathalie ULg

Conference given outside the academic context (2013)

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See detailPiles à combustible: vers une solution économiquement viable
Job, Nathalie ULg

Conference given outside the academic context (2013)

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See detailÉtude du mécanisme d'électrooxydation de BH4- sur platine à bas potentiel
Olu, Pierre-Yves; Rouhet, Marlène; Bonnefont, Antoine et al

Conference (2013)

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See detailApproaches to synthesize carbon-supported platinum-based electrocatalysts for proton-exchange membrane fuel cells
Maillard, Frédéric; Job, Nathalie ULg; Chatenet, Marian

in Suib, Steven (Ed.) New and future developments in catalysis. Batteries, hydrogen storage and fuel cells (2013)

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See detailBasics of PEMFC including the use of carbon-supported nanoparticles
Chatenet, Marian; Job, Nathalie ULg; Maillard, Frédéric

in Suib, Steven (Ed.) New and future developments in catalysis. Catalysis by nanoparticles. (2013)

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See detailEfficient Pt/carbon electrocatalysts for Proton Exchange Membrane fuel cells: avoid chloride-based Pt salts !
Job, Nathalie ULg; Chatenet, Marian; Berthon-Fabry, Sandrine et al

in Journal of Power Sources (2013), 240

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See detailCatalytic layer for PEMFC based on carbon xerogels
Deschamps, Fabien ULg; Traina, Karl; Pirard, Jean-Paul ULg et al

in Proceedings of the Fundamentals and Development of Fuel cells 2013 conference (2013)

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See detailMass transport in carbon gels with tuned porosity
Job, Nathalie ULg

in Spanish Carbon Group Bulletin (2012)

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See detailPropriétés physicochimiques et électrochimiques de catalyseurs Pt/xérogel de carbone synthétisés par la méthode de SEA multiple.
Zubiaur, Anthony ULg; Chatenet, M.; Maillard, F. et al

Conference (2012, October 01)

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See detailFonctionnalisation surfacique de poudre de carbone pour greffer des nanoparticules métalliques par plasma.
Laurent-Brocq, M.; Job, Nathalie ULg; Pireaux, J.-J.

Conference (2012, October 01)

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See detailPréparation de couches catalytiques pour PEMFC à partir de xérogels de carbone.
Deschamps, Fabien ULg; Traina, Karl; Pirard, Jean-Paul et al

Conference (2012, October 01)

Detailed reference viewed: 13 (1 ULg)