In addition, the signal of AlCl 4 − at 349 cm –1 exhibited an initial enhancement followed by a decreasing trend, which was attributed to the release of AlCl 4 − during preliminary discharge (above 1.80 V) and subsequent further insertion of Al 3+ .
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Superlattice cathodes endow cation and anion co-intercalation for high-energy-density aluminium batteries.
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