An aluminum metal, both native and with a very thin oxide film, was investigated as an anode for aluminum-ion batteries. Investigations were carried out in an acidic ionic liquid electrolyte, composed of AlCl in 1-ethyl-3-methylimidazolium chloride ([EMIm]Cl), with β-MnO/C as a cathode. The battery based on Al metal with a very thin oxide film showed high capacity and stable surface corrosion.
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