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Actually it is only a new kind of supercapacitor, even though they claimed that it was an aluminum ion battery. It is the ionic liquid electrolyte (EMImAlCl4) that reacts with (AlCl4- anions intercalate into) graphite foil under moderate voltage, not Al3+ cations from Al electrode. If the Al electrode is replaced by other stable metal or graphite, the results should be the same. Compared with other real aluminum ion battery (Chem. Commun., 2011, 47, 12610¨C12612), its specific capacity is too low (60 vs 273 mAh/g). As a supercapacitor, its specific capacitance is only 4A/g*54s/(2.45-0.4V)=105.4 F/g. I can only smile on this "Nature" paper.
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