Metal organic framework derived defect-rich manganese oxide cathode materials for zinc-ion batteries

Rechargeable zinc-ion batteries (ZIBs) using mild aqueous electrolytes hold great potential for applications in smart wearable and flexible devices. However, the cathode materials of ZIBs are susceptible to chemical structure and strong electrostatic interactions, leading to poor reaction kinetics and rapid capacity decay. These inherent issues need to be addressed through rational crystal structure modification. In this work, using metal-organic framework materials (Mn-MOFs) as precursors, a defect-rich manganese oxide (Mn 2 O 3-x ) cathode material was prepared through a simple reduction strategy. The Mn-MOFs derived Mn 2 O 3-x features a rich mesoporous structure, which shortens the ion diffusion pathways, thereby enhancing ion transport efficiency and improving the material’s electrochemical performance. Meanwhile, the introduction of oxygen defects can alter the internal electric field of the material, improving its stability. The abundant oxygen vacancies contribute to enhancing the ionic conductivity of the material and optimizing its dynamic processes. Consequently, the ZIBs based on Mn 2 O 3-x exhibit a high specific capacity (353 mAh g ‐1 ), excellent rate performance, and cycling stability. This research provides a novel approach to addressing the instability of manganese-based oxides, offering valuable guidance for optimizing high-performance ZIBs.