Towards Chloride-Free Organic Electrolytes for Rechargeable Aluminum Batteries



The corrosivity of chloride-based electrolytes is a major shortcoming in the practical realization of rechargeable aluminum batteries. Herein, the effect of Cl- on Al speciation and electrochemistry in tetrahydrofuran was measured by employing theoretical and experimental approaches for three systems: Al(OTF)3/THF, Al(OTF)3 plus LiCl in THF, and AlCl3/THF. The high consistency between measured and computed spectroscopic aspects associated with Al(OTF)3/THF electrolyte provided both a rationale for understanding Al complex-ion formation in a Cl- free environment and an approach for examining the effect of Cl- on Al speciation. Room-temperature Al plating was achieved from dilute solutions ([Al] = 0.1M) at potentials ≥ 0V (vs. Al⁄Al3+). Cl- is found to enable facile Al plating and SEM reveals that Al is electrochemically deposited as nanocrystalline grains.

Version notes

Fixed minor typos and formatting in the manuscript and supporting information. Specifically, there were typos in reactions 1, 2, and 3 of the manuscript, and there was red text in the SI that should have been black


Thumbnail image of ChemRxiv_manuscript.pdf

Supplementary material

Thumbnail image of Supporting_info_final-draft.pdf
Supporting information
Electronic supporting information for the manuscript. Contains information on methods and materials, calculated vibrations and energies, and additional experimental data