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Influence of the electrode nano/microstructure on the electrochemical properties of graphite in aluminum batteries

: Greco, G.; Tatchev, D.; Hoell, A.; Krumrey, M.; Raoux, S.; Hahn, R.; Elia, G.A.

Volltext ()

Journal of materials chemistry. A, Materials for energy and sustainability 6 (2018), Nr.45, S.22673-22680
ISSN: 2050-7488
ISSN: 2050-7496
Zeitschriftenaufsatz, Elektronische Publikation
Fraunhofer IZM ()

Herein we report on a detailed investigation of the irreversible capacity in the first cycle of pyrolytic graphite electrodes in aluminum batteries employing 1-ethyl-3-methylimidazolium chloride:aluminum trichloride (EMIMCl:AlCl3) as electrolyte. The reaction mechanism, involving the intercalation of AlCl4− in graphite, has been fully characterized by correlating the micro/nanostructural modification to the electrochemical performance. To achieve this aim a combination of X-ray diffraction (XRD), small angle X-ray scattering (SAXS) and computed tomography (CT) has been used. The reported results evidence that the irreversibility is caused by a very large decrease in the porosity, which consequently leads to microstructural changes resulting in the trapping of ions in the graphite. A powerful characterization methodology is established, which can also be applied more generally to carbon-based energy-related materials.