Constructing graphene conductive networks in manganese vanadate as high-performance cathode for aqueous zinc-ion batteries

Abstract

Aqueous zinc-ion batteries (AZIBs) have been widely studied for their cheapness, safety, as well as high energy and power density. Electrode material plays a dominant role in the electrochemical properties of zinc-ion batteries. Reduced graphene oxide (rGO) can easily interact with compounds via π-π stacking for high-speed electron transport. In this study, The Mn-modified V6O13 material cathode was uniformly loaded onto the rGO conductive network. rGO can release the electron conduction process that limits the performance of the electrode material, and improves the rapid charge and discharge performance of the material. The results show that MnVO@rGO exhibits excellent energy storage properties with a high capacity of 360.3 mAh g−1 at a current density of 0.2 A g−1 in being used as the cathode material for AZIBs. More significantly, even with a current density expansion of a factor of 100, the MnVO@rGO//Zn battery still has a capacity of 88.9 mAh g−1 and a capacity retention rate of over 100% after 10,000 cycles. In addition, it has the maximal energy density of 260.0 Wh kg−1 and power density of 9113.7 W kg−1. This study provides an interesting idea for the development of electrode materials for zinc-ion batteries.