INVESTIGADORES
PASSEGGI Mario Cesar Guillermo
artículos
Título:
Aluminum fluoride intercalation in graphite for rechargeable batteries design
Autor/es:
CANDIA, A.E.; RODRÍGUEZ, S.J.; ALBANESI, E.A.; BERNARDI, G.; FREGENAL, D.; ZAMPIERI, G.E.; PASSEGGI, M.C.G.; RUANO, G.
Revista:
CARBON
Editorial:
PERGAMON-ELSEVIER SCIENCE LTD
Referencias:
Lugar: New York; Año: 2022 vol. 186 p. 724 - 736
ISSN:
0008-6223
Resumen:
Rechargeable batteries based on graphite areconsidered as promising alternatives for energy storage applications. Thecharge/discharge mechanisms of these batteries results from the intercalationand deintercalation driven electrochemically by the atoms or molecules of theelectrodes in contact with a liquid electrolyte. These solutions are oftencomplex systems engineered to stabilize and allow the transport of the evolvingmoieties. In this article, we isolate the effect on the graphite structure of achemical component of novel electrolytes, the aluminum fluoride (AlF3), by dosing this purecompound in the gas phase over high oriented pyrolitic graphite (HOPG) substrates at 10-9 mbarand 300 K. We performed an extensive experimental study involving surface characterizationand beam analysis techniques, and developed a model of the sorptionsubstantiated in ab-initio calculations. We found a preferential interlaminarabsorption when dosing in the direction transversal to the carbon planes. The intercalationin the HOPG is spontaneous and non-reactive, and increases the interplanarspacing by 20%. A charge transfer of 0.65 e- per formula fromgraphite to AlF3 is calculated for the intercalate. Since the absorptiondepends on the roughness of the substrate we may infer that the intercalationproceeds through the step-edges. These features may contribute to thedevelopment of novel quasi-2D devices for special applications.