Phase regulation of manganese vanadium oxide and its effects on capacity for aqueous zinc-ion battery

Phase structure in manganese vanadium oxide is very important for zinc ion battery. This work aims to regulate the phase structure of manganese vanadium oxide from MnV 12 O 31 ·10H 2 O to Mn(VO 3 ) 2 by mass loading of Mn sources. In addition, the influences of morphologies and phase structure on capacity are studied in detail. The results show that MnV 12 O 31 ·10H 2 O appears at loading lower Mn source, while, Mn(VO 3 ) 2 appears at loading higher Mn source. The optimized sample of Mn(VO 3 ) 2 /MnV 12 O 31 ·10H 2 O composite (MnVO-0.5) shows high specific capacity of 323.6 mAh g −1 and high maximum energy density of 269.43 Wh kg −1 with excellent capacity retention.