Manganese vanadium oxide composite as a cathode for high-performance aqueous zinc-ion batteries

Abstract

The development of clean renewable energy and energy storage devices is of great significance under the present energy crisis and environmental pollution background. Aqueous zinc-ion battery (ZIB) has become one of the most promising energy storage devices due to its high capacity, safety and low cost. However, the application of ZIB cathode is usually limited by low capacity and poor stability. Herein, we propose a novel heterostructure MnO/MnV2O4 composite material composed of MOF derivatives and spinel with dual active components as cathode for ZIBs. Benefited from substantial framework of MOF derivatives and the synergistic effect of heterostructures, MnO/MnV2O4 exhibits excellent rate performance (342 mAh/g at 0.1 A/g, 261 mAh/g at 15 A/g) and cycling performance (198.9 mAh/g at 10 A/g after 2000 cycles) in 3 mol/L Zn(CF3SO3)2 electrolytes. This work extends the range of developing high-performance cathodes for ZIBs under high current density and is expected to enlighten the optimization of commercial energy storage devices.