Abstract
Main observation and conclusionThe cathode material plays a crucial role in the performances of aqueous zinc‐ion batteries (ZIBs). Herein, we report an ammonium vanadate (NH4V4O10∙0.28H2O, NHVO) aqueous ZIB cathode material. The obtained NHVO microflowers manifest high discharge capacity (410 mA·h∙g–1 at 0.2 A∙g–1), long‐term durability (76% capacity retention over 500 cycles), as well as ideal rate performance (112 mA·h∙g–1 at 10 A∙g–1). The impressive electrochemical performance can be attributed to the ammonium ion and structural water co‐assisted Zn2+ intercalation/de‐intercalation, which has been demonstrated by various ex‐situ and in‐situ characterizations. The superior electrochemical performance makes the NHVO microflower an ideal candidate cathode material for aqueous ZIBs.
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