Mn2O3/Al2O3 cathode material derived from bimetal-organic framework with enhanced cycling performance for aqueous zinc-ion batteries
Rechargeable aqueous zinc-ion batteries (ZIBs) are considered to be a kind of potential candidate for large-scale energy storage due to their high capacity, low cost, high safety and environmental friendliness. A key problem that the Mn-based cathodes meet is the dissolution of Mn2+ that cause significant capacity fading. Herein, a novel Mn2O3/Al2O3 composite material with microbundles structure was synthesized using ‘MOFs as precursors’ strategy. The uniformly distributed Mn2O3 and Al2O3 with precise controlled Mn/Al molar ratio can be easily realized in this method. After compositing with Al2O3, the resulted material shows not only higher capacity but also better cycling stability (118.0 mAh g-1 after 1100 at 1500 mA g-1) than the pure Mn2O3. Combined with the ICP analysis, it can be deduced that Al2O3 can effectively inhibit the dissolution of Mn2+ from Mn3+ disproportionation. Our result can provide some inspirations for the modification of Mn-based materials and could also be extended to other materials in zinc ion battery or other battery systems.