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Abstract Irreversible reductive insertion of Zn 2+ transforms Mn 3 O 4 such that the resulting Zn 0.2 Mn 3 O 4 exhibits highly reversible storage properties of chloride ions, thus rendering Zn 0.2 Mn 3 O 4 an excellent cathode of aqueous dual‐ion batteries. With Zn 2+ trapped, Zn 0.2 Mn 3 O 4 delivers the chloride‐storage capacity over 200 mAh/g at an average potential of 1.6 V vs Zn 2+ /Zn by reversibly forming a new ionic compound equivalent to Zn 0.2 Mn 3 O 4 Cl 1.7 . Electrochemical quartz crystal microbalance results suggest chloride as the primary charge carrier in the reversible oxidative anion insertion. The Mn 3 O 4 anion‐hosting cathode couples with Zn metal anode in a full‐cell dual‐ion battery, demonstrating stable cycling in practical pouch cells with an energy density of 150 Wh/kg based on the mass of both electrodes.
Jiang et al. (Fri,) studied this question.