Synergistic effect of Sn doped manganese oxide and conductive reduced graphene oxide for zinc ion battery

Abstract

Manganese based oxide is a kind of promising water zinc ion batteries (ZIBs) cathode electrode material. It has the advantages of lower cost and higher operating voltage range, but this kind of material has poor conductivity, easy collapse of structure during the reaction process, and the material dissolves, etc., which is widely concerned and studied by researchers. In this paper, Sn-doped manganese oxides coated with reduced graphene oxide (rGO) nanorod-like materials (2%Sn-MnOx/rGO) were prepared by in situ solvothermal autogenous growth method. The abundant Sn active sites are highly dispersed, and the introduction of graphene increased the conductivity of 2%Sn-MnOx, reduced the dissolution of Mn2+. The ZIBs assembled with 2%Sn-MnOx/rGO cathode material has a maximum specific capacity of 352.3 mAh g−1 at 0.1 A g−1, and the rate performance is 211.3 mAh g−1 at 1.0 A g−1. Moreover, at 1.0 A g−1, the capacity is still 108.5 mAh g−1 after 1000 cycles. In addition, 2%Sn-MnOx/rGO successfully assembled a flexible quasi-solid ZIB. The synergistic effect introduced by metal Sn doping and graphene can provide a good improvement effect for the energy storage performance and application of manganese-based oxides in water zinc electricity, which is a feasible optimization strategy.