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Insights into the reversibility of aluminum graphite batteries

: Elia, G.A.; Hasa, I.; Greco, G.; Diemant, T.; Marquardt, K.; Hoeppner, K.; Behm, R.J.; Hoell, A.; Passerini, S.; Hahn, R.


Journal of materials chemistry. A, Materials for energy and sustainability 5 (2017), No.20, pp.9682-9690
ISSN: 2050-7488
ISSN: 2050-7496
European Commission EC
646286; ALION
High Specific Energy Aluminium-Ion Rechargeable Decentralized Electricity Generation Sources
Bundesministerium für Bildung und Forschung BMBF
Journal Article
Fraunhofer IZM ()

Herein we report a novel study on the reaction mechanism of non-aqueous aluminum/graphite cell chemistry employing 1-ethyl-3-methylimidazolium chloride: aluminum trichloride (EMIMCl:AlCl3) as the electrolyte. This work highlights new insights into the reversibility of the anion intercalation chemistry besides confirming its outstanding cycle life exceeding 2000 cycles, corresponding to more than 5 months of cycling test. The reaction mechanism, involving the intercalation of AlCl4- in graphite, has been fully characterized by means of ex situ X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), X-ray absorption near edge structure spectroscopy (XANES) and small-angle X-ray scattering (SAXS), evidencing the accumulation of anionic species into the cathode as the main factor responsible for the slight initial irreversibility of the electrochemical process.