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 MnV12O31 & sdot;10H2O 12 O 31 & sdot; 10H 2 O to Mn(VO3)2 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 MnV12O31 & sdot;10H2O 12 O 31 & sdot; 10H 2 O appears at loading lower Mn source, while, Mn(VO3)2 3 ) 2 appears at loading higher Mn source. The optimized sample of Mn(VO3)2/MnV12O31 & sdot;10H2O 3 ) 2 /MnV 12 O 31 & sdot; 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.